Python PySerial for AV Control: Complete Setup Guide for Professional Installations
Python has emerged as a powerful tool for audiovisual control systems, offering flexibility, rapid development, and extensive library support. PySerial, Python's premier serial communication library, enables seamless integration with professional AV equipment including projectors, displays, audio processors, and control systems. This comprehensive guide will transform you into a proficient Python AV programmer, ready to tackle real-world installation challenges.
Table of Contents
- Introduction to Python for AV Control
- PySerial Installation and Setup
- Cross-Platform Serial Port Detection
- Essential PySerial Configuration
- Building Robust Device Classes
- Error Handling and Recovery Strategies
- Real-Time Control Implementation
- Cross-Platform Deployment
- Performance Optimization
- Testing and Validation
- Troubleshooting Common Issues
- Best Practices
Introduction to Python for AV Control
Python's simplicity and powerful libraries make it an ideal choice for AV control applications. Unlike traditional control system programming languages, Python offers modern development practices, extensive third-party libraries, and seamless integration with network protocols, databases, and web services.
Why Python for AV Control?
Advantages of Python in AV:
- Rapid Development: Faster prototyping and deployment cycles
- Cross-Platform Compatibility: Runs on Windows, macOS, Linux, and embedded systems
- Rich Ecosystem: Extensive libraries for networking, GUI development, and data processing
- Modern Language Features: Object-oriented programming, exception handling, and threading
- Community Support: Large developer community and extensive documentation
Python vs Traditional Control Systems
| Feature | Python | Traditional Control |
|---|---|---|
| Learning Curve | Moderate | Steep |
| Development Speed | Fast | Slow |
| Debugging Tools | Excellent | Limited |
| Integration Options | Extensive | Vendor-specific |
| Cost | Free | Licensed |
| Hardware Requirements | Flexible | Proprietary |
Common AV Control Applications
Python excels in various AV control scenarios:
- Custom Touch Panel Interfaces: Web-based control panels using Flask/Django
- API Integration: Connecting legacy devices to modern cloud services
- Data Logging: Recording system status and usage analytics
- Automated Testing: Equipment validation and commissioning tools
- Bridge Applications: Converting between different protocols (serial to TCP/IP)
PySerial Installation and Setup
Proper PySerial installation and configuration forms the foundation of reliable AV control applications. This section covers installation across all major platforms and essential configuration steps.
Installation Methods
Using pip (Recommended):
bash
[object Object],
pip install pyserial
,[object Object],
pip install pyserial[tools]
,[object Object],
python -c ,[object Object],Using conda:
bash
[object Object],
conda install -c conda-forge pyserial
,[object Object],
conda create -n av-control python=3.11 pyserial
conda activate av-controlDevelopment Installation:
bash
[object Object],
git ,[object Object], https://github.com/pyserial/pyserial.git
,[object Object], pyserial
pip install -e .Virtual Environment Setup
Creating isolated environments prevents dependency conflicts:
bash
[object Object],
python -m venv av-control-env
,[object Object],
av-control-env\Scripts\activate
,[object Object],
,[object Object], av-control-env/bin/activate
,[object Object],
pip install pyserial requests flaskRequired Dependencies
Core Dependencies:
python
[object Object],
pyserial>=,[object Object],
requests>=,[object Object],[object Object],
click>=,[object Object],[object Object],
pyyaml>=,[object Object],
colorama>=,[object Object],[object Object], ,[object Object],Optional Dependencies for Enhanced Features:
python
[object Object],
pyserial[tools]>=,[object Object],
flask>=,[object Object],[object Object], ,[object Object],
asyncio-serial>=,[object Object],[object Object], ,[object Object],
pymodbus>=,[object Object],[object Object], ,[object Object],
crcmod>=,[object Object], ,[object Object],Verification Script
Create a verification script to test your installation:
python
[object Object],
,[object Object],
,[object Object], sys
,[object Object], platform
,[object Object], ,[object Object],():
,[object Object],
,[object Object],(,[object Object],)
,[object Object],(,[object Object], * ,[object Object],)
,[object Object],
,[object Object],(,[object Object],)
,[object Object],(,[object Object],)
,[object Object],
,[object Object],:
,[object Object], serial
,[object Object],(,[object Object],)
,[object Object], ImportError:
,[object Object],(,[object Object],)
,[object Object], ,[object Object],
,[object Object],
,[object Object],:
,[object Object], serial.tools.list_ports
ports = ,[object Object],(serial.tools.list_ports.comports())
,[object Object],(,[object Object],)
,[object Object], port ,[object Object], ports[:,[object Object],]: ,[object Object],
,[object Object],(,[object Object],)
,[object Object], ImportError:
,[object Object],(,[object Object],)
,[object Object],
optional_modules = [
(,[object Object],, ,[object Object],),
(,[object Object],, ,[object Object],),
(,[object Object],, ,[object Object],),
(,[object Object],, ,[object Object],)
]
,[object Object],(,[object Object],)
,[object Object], module, description ,[object Object], optional_modules:
,[object Object],:
,[object Object],(module)
,[object Object],(,[object Object],)
,[object Object], ImportError:
,[object Object],(,[object Object],)
,[object Object], ,[object Object],
,[object Object], __name__ == ,[object Object],:
,[object Object], check_installation():
,[object Object],(,[object Object],)
,[object Object],:
,[object Object],(,[object Object],)
sys.exit(,[object Object],)Cross-Platform Serial Port Detection
Reliable serial port detection across different operating systems is crucial for professional AV applications. Python's PySerial provides powerful tools for automatic port discovery and device identification.
Universal Port Detection
python
[object Object], serial.tools.list_ports
,[object Object], platform
,[object Object], re
,[object Object], typing ,[object Object], ,[object Object],, ,[object Object],, ,[object Object],
,[object Object], ,[object Object],:
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],.system = platform.system().lower()
,[object Object],.detected_ports = []
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
ports = []
,[object Object],:
,[object Object], port ,[object Object], serial.tools.list_ports.comports():
port_info = {
,[object Object],: port.device,
,[object Object],: port.name,
,[object Object],: port.description,
,[object Object],: port.hwid,
,[object Object],: port.vid,
,[object Object],: port.pid,
,[object Object],: port.serial_number,
,[object Object],: port.manufacturer,
,[object Object],: port.product,
,[object Object],: port.interface
}
ports.append(port_info)
,[object Object], Exception ,[object Object], e:
,[object Object],(,[object Object],)
,[object Object],.detected_ports = ports
,[object Object], ports
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
av_keywords = [
,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],,
,[object Object],, ,[object Object],, ,[object Object],
]
av_ports = []
,[object Object], port ,[object Object], ,[object Object],.detected_ports:
description = port[,[object Object],].lower()
manufacturer = (port[,[object Object],] ,[object Object], ,[object Object],).lower()
,[object Object], ,[object Object],(keyword ,[object Object], description ,[object Object], keyword ,[object Object], manufacturer
,[object Object], keyword ,[object Object], av_keywords):
port[,[object Object],] = ,[object Object],
av_ports.append(port)
,[object Object], av_ports
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
matching_ports = []
,[object Object], port ,[object Object], ,[object Object],.detected_ports:
,[object Object], port[,[object Object],] ,[object Object], vendor_ids:
matching_ports.append(port)
,[object Object], matching_ports
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
matching_ports = []
,[object Object], port ,[object Object], ,[object Object],.detected_ports:
description = port[,[object Object],].lower()
,[object Object], pattern ,[object Object], patterns:
,[object Object], re.search(pattern.lower(), description):
matching_ports.append(port)
,[object Object],
,[object Object], matching_ports
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
,[object Object], ,[object Object],.system == ,[object Object],:
,[object Object], [,[object Object], ,[object Object], i ,[object Object], ,[object Object],(,[object Object],, ,[object Object],)]
,[object Object], ,[object Object],.system == ,[object Object],: ,[object Object],
,[object Object], [,[object Object],, ,[object Object],]
,[object Object],: ,[object Object],
,[object Object], [,[object Object],, ,[object Object],, ,[object Object],]
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object],:
,[object Object], serial.Serial(port, baudrate, timeout=,[object Object],) ,[object Object], ser:
,[object Object], ser.is_open
,[object Object], Exception:
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object],.scan_all_ports()
,[object Object],
av_device_ids = {
,[object Object],: [,[object Object],], ,[object Object],
,[object Object],: [,[object Object],], ,[object Object],
,[object Object],: [,[object Object],], ,[object Object],
,[object Object],: [,[object Object],], ,[object Object],
,[object Object],: [,[object Object],], ,[object Object],
}
detected_equipment = {
,[object Object],: ,[object Object],(,[object Object],.detected_ports),
,[object Object],: [],
,[object Object],: {},
,[object Object],: []
}
,[object Object], port ,[object Object], ,[object Object],.detected_ports:
,[object Object],
manufacturer = port[,[object Object],] ,[object Object], ,[object Object],
,[object Object], manufacturer ,[object Object], ,[object Object], detected_equipment[,[object Object],]:
detected_equipment[,[object Object],][manufacturer] = []
detected_equipment[,[object Object],][manufacturer].append(port)
,[object Object],
av_score = ,[object Object],
av_indicators = []
,[object Object],
,[object Object], port[,[object Object],]:
,[object Object], device_type, vids ,[object Object], av_device_ids.items():
,[object Object], port[,[object Object],] ,[object Object], vids:
av_score += ,[object Object],
av_indicators.append(,[object Object],)
,[object Object],
av_terms = [,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],]
description = (port[,[object Object],] ,[object Object], ,[object Object],).lower()
,[object Object], term ,[object Object], av_terms:
,[object Object], term ,[object Object], description:
av_score += ,[object Object],
av_indicators.append(,[object Object],)
,[object Object],
,[object Object], ,[object Object],.test_port_connectivity(port[,[object Object],]):
av_score += ,[object Object],
av_indicators.append(,[object Object],)
,[object Object], av_score >= ,[object Object],:
port[,[object Object],] = av_score
port[,[object Object],] = av_indicators
detected_equipment[,[object Object],].append(port)
,[object Object], av_score >= ,[object Object],:
detected_equipment[,[object Object],].append(port)
,[object Object], detected_equipment
,[object Object],
detector = SerialPortDetector()
equipment = detector.smart_detect_av_equipment()
,[object Object],(,[object Object],)
,[object Object],(,[object Object],)
,[object Object], port ,[object Object], equipment[,[object Object],]:
,[object Object],(,[object Object],)
,[object Object],(,[object Object],)Platform-Specific Implementations
Windows-Specific Detection:
python
[object Object], winreg
,[object Object], ctypes
,[object Object], ctypes ,[object Object], wintypes
,[object Object], ,[object Object],:
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
ports = {}
,[object Object],:
,[object Object], winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE,
,[object Object],) ,[object Object], key:
,[object Object], i ,[object Object], ,[object Object],(winreg.QueryInfoKey(key)[,[object Object],]):
name, value, _ = winreg.EnumValue(key, i)
ports[value] = name
,[object Object], FileNotFoundError:
,[object Object], ,[object Object],
,[object Object], Exception ,[object Object], e:
,[object Object],(,[object Object],)
,[object Object], ports
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], subprocess
,[object Object],:
,[object Object],
cmd = ,[object Object],
result = subprocess.run(
[,[object Object],, ,[object Object],, cmd],
capture_output=,[object Object],, text=,[object Object],
)
,[object Object], result.stdout
,[object Object], Exception ,[object Object], e:
,[object Object],(,[object Object],)
,[object Object], ,[object Object],macOS-Specific Detection:
python
[object Object], subprocess
,[object Object], plistlib
,[object Object], ,[object Object],:
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],:
result = subprocess.run(
[,[object Object],, ,[object Object],, ,[object Object],],
capture_output=,[object Object],, text=,[object Object],
)
,[object Object], result.returncode == ,[object Object],:
plist_data = plistlib.loads(result.stdout.encode())
,[object Object], ,[object Object],._parse_usb_data(plist_data)
,[object Object], Exception ,[object Object], e:
,[object Object],(,[object Object],)
,[object Object], []
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
serial_devices = []
,[object Object], ,[object Object],(,[object Object],):
,[object Object], item ,[object Object], items:
,[object Object],
name = item.get(,[object Object],, ,[object Object],).lower()
,[object Object], ,[object Object],(term ,[object Object], name ,[object Object], term ,[object Object], [,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],]):
device_info = {
,[object Object],: item.get(,[object Object],),
,[object Object],: item.get(,[object Object],),
,[object Object],: item.get(,[object Object],),
,[object Object],: item.get(,[object Object],),
,[object Object],: item.get(,[object Object],)
}
serial_devices.append(device_info)
,[object Object],
,[object Object], ,[object Object], ,[object Object], item:
search_devices(item[,[object Object],])
,[object Object], usb_data ,[object Object], ,[object Object],(usb_data) > ,[object Object],:
search_devices(usb_data[,[object Object],].get(,[object Object],, []))
,[object Object], serial_devices
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],:
result = subprocess.run(
[,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],],
capture_output=,[object Object],, text=,[object Object],
)
,[object Object], result.stdout
,[object Object], Exception ,[object Object], e:
,[object Object],(,[object Object],)
,[object Object], ,[object Object],Linux-Specific Detection:
python
[object Object], glob
,[object Object], os
,[object Object], ,[object Object],:
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
devices = []
,[object Object],
tty_devices = glob.glob(,[object Object],)
tty_devices.extend(glob.glob(,[object Object],))
,[object Object], device_path ,[object Object], tty_devices:
device_info = ,[object Object],._get_device_info(device_path)
,[object Object], device_info:
devices.append(device_info)
,[object Object], devices
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
device_name = os.path.basename(device_path)
device_file = ,[object Object],
,[object Object], ,[object Object], os.path.exists(device_file):
,[object Object], ,[object Object],
info = {
,[object Object],: device_file,
,[object Object],: device_name,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
}
,[object Object],
,[object Object],:
,[object Object],
usb_device_path = device_path
,[object Object], os.path.islink(usb_device_path):
usb_device_path = os.path.join(
os.path.dirname(usb_device_path),
os.readlink(usb_device_path)
)
,[object Object],
current_path = usb_device_path
,[object Object], current_path != ,[object Object],:
current_path = os.path.dirname(current_path)
,[object Object],
vendor_file = os.path.join(current_path, ,[object Object],)
product_file = os.path.join(current_path, ,[object Object],)
manufacturer_file = os.path.join(current_path, ,[object Object],)
product_name_file = os.path.join(current_path, ,[object Object],)
,[object Object], os.path.exists(vendor_file):
info[,[object Object],] = ,[object Object],._read_file(vendor_file)
info[,[object Object],] = ,[object Object],._read_file(product_file)
info[,[object Object],] = ,[object Object],._read_file(manufacturer_file)
info[,[object Object],] = ,[object Object],._read_file(product_name_file)
,[object Object],
,[object Object], Exception ,[object Object], e:
,[object Object],(,[object Object],)
,[object Object], info
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],:
,[object Object], ,[object Object],(filepath, ,[object Object],) ,[object Object], f:
,[object Object], f.read().strip()
,[object Object], Exception:
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],:
,[object Object], os.access(device_path, os.R_OK | os.W_OK)
,[object Object], Exception:
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],:
result = subprocess.run(
[,[object Object],, ,[object Object],, ,[object Object],, device_name, ,[object Object],],
capture_output=,[object Object],, text=,[object Object],
)
,[object Object], result.stdout ,[object Object], result.returncode == ,[object Object], ,[object Object], ,[object Object],
,[object Object], Exception ,[object Object], e:
,[object Object],(,[object Object],)
,[object Object], ,[object Object],Essential PySerial Configuration
Proper configuration ensures reliable communication with AV equipment. Different devices require specific parameter combinations, and understanding these requirements is crucial for successful implementation.
Basic Serial Configuration
python
[object Object], serial
,[object Object], time
,[object Object], typing ,[object Object], ,[object Object],, ,[object Object],, ,[object Object],
,[object Object], ,[object Object],:
,[object Object],
,[object Object],
DEVICE_PRESETS = {
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
},
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
},
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
},
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
}
}
,[object Object], ,[object Object],(,[object Object],):
,[object Object],.port = port
,[object Object],.config = ,[object Object],.DEVICE_PRESETS.get(preset,
,[object Object],.DEVICE_PRESETS[,[object Object],]).copy()
,[object Object],.serial_instance = ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], key, value ,[object Object], kwargs.items():
,[object Object], key ,[object Object], ,[object Object],.config:
,[object Object],.config[key] = value
,[object Object],:
,[object Object], ValueError(,[object Object],)
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[serial.Serial]:
,[object Object],
,[object Object],:
,[object Object],.serial_instance = serial.Serial(
port=,[object Object],.port,
**,[object Object],.config
)
,[object Object],
time.sleep(,[object Object],)
,[object Object], ,[object Object],.serial_instance
,[object Object], serial.SerialException ,[object Object], e:
,[object Object],(,[object Object],)
,[object Object], ,[object Object],
,[object Object], Exception ,[object Object], e:
,[object Object],(,[object Object],)
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
test_results = {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
}
,[object Object],:
,[object Object],
test_serial = serial.Serial(,[object Object],.port,
baudrate=,[object Object],,
timeout=,[object Object],)
test_results[,[object Object],] = ,[object Object],
test_serial.close()
,[object Object],
test_serial = serial.Serial(port=,[object Object],.port, **,[object Object],.config)
test_results[,[object Object],] = ,[object Object],
,[object Object],
time.sleep(,[object Object],)
,[object Object], test_serial.is_open:
test_results[,[object Object],] = ,[object Object],
test_serial.close()
,[object Object], serial.SerialException ,[object Object], e:
test_results[,[object Object],] = ,[object Object],
,[object Object], Exception ,[object Object], e:
test_results[,[object Object],] = ,[object Object],
,[object Object], test_results
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
,[object Object], possible_rates ,[object Object], ,[object Object],:
possible_rates = [,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],]
original_baudrate = ,[object Object],.config[,[object Object],]
,[object Object], baudrate ,[object Object], possible_rates:
,[object Object],(,[object Object],)
,[object Object],.config[,[object Object],] = baudrate
,[object Object],:
test_serial = serial.Serial(port=,[object Object],.port, **,[object Object],.config)
,[object Object],
,[object Object], command ,[object Object], test_commands:
test_serial.write(command.encode() + ,[object Object],)
time.sleep(,[object Object],)
response = test_serial.read(,[object Object],)
,[object Object], response ,[object Object], ,[object Object],(response) > ,[object Object],:
,[object Object],(,[object Object],)
test_serial.close()
,[object Object], baudrate
test_serial.close()
,[object Object], Exception ,[object Object], e:
,[object Object],(,[object Object],)
,[object Object],
,[object Object],
,[object Object],.config[,[object Object],] = original_baudrate
,[object Object], ,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
MANUFACTURER_CONFIGS = {
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
},
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
},
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
},
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
},
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
}
}
,[object Object], ,[object Object],(,[object Object],):
,[object Object],.device_type = device_type
,[object Object],.device_config = ,[object Object],.MANUFACTURER_CONFIGS.get(device_type, {})
,[object Object],
serial_params = {k: v ,[object Object], k, v ,[object Object], ,[object Object],.device_config.items()
,[object Object], k ,[object Object], [,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],,
,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],]}
,[object Object],().__init__(port, ,[object Object],)
,[object Object],.config.update(serial_params)
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
,[object Object], {k: v ,[object Object], k, v ,[object Object], ,[object Object],.device_config.items()
,[object Object], k ,[object Object], ,[object Object], [,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],,
,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],]}Buffer Management and Flow Control
python
[object Object], ,[object Object],:
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],.serial = serial_port
,[object Object],.buffer_size = buffer_size
,[object Object],.read_buffer = ,[object Object],()
,[object Object],.write_buffer = ,[object Object],()
,[object Object],.buffer_lock = threading.Lock()
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],(,[object Object],.serial, ,[object Object],):
,[object Object],
,[object Object],.serial.set_buffer_size(rx_size=,[object Object],.buffer_size,
tx_size=,[object Object],.buffer_size)
,[object Object],:
,[object Object],
,[object Object], termios
,[object Object], ,[object Object],(termios, ,[object Object],):
,[object Object],:
,[object Object],
,[object Object], fcntl
fcntl.ioctl(,[object Object],.serial.fileno(),
termios.TIOCMSET, ,[object Object],.buffer_size)
,[object Object], Exception ,[object Object], e:
,[object Object],(,[object Object],)
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],.buffer_lock:
,[object Object],.read_buffer.clear()
,[object Object],.write_buffer.clear()
,[object Object], ,[object Object],.serial.is_open:
,[object Object],.serial.flush()
,[object Object],.serial.reset_input_buffer()
,[object Object],.serial.reset_output_buffer()
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],.buffer_lock:
,[object Object],.write_buffer.extend(data)
,[object Object],
,[object Object], (,[object Object],(,[object Object],.write_buffer) >= ,[object Object],.buffer_size ,[object Object],
,[object Object], ,[object Object], data ,[object Object], ,[object Object], ,[object Object], data):
,[object Object],.serial.write(,[object Object],.write_buffer)
,[object Object],.write_buffer.clear()
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object], ,[object Object],.buffer_lock:
,[object Object],
available = ,[object Object],.serial.in_waiting
,[object Object], available > ,[object Object],:
new_data = ,[object Object],.serial.read(available)
,[object Object],.read_buffer.extend(new_data)
,[object Object],
,[object Object], size ,[object Object], ,[object Object],:
result = ,[object Object],(,[object Object],.read_buffer)
,[object Object],.read_buffer.clear()
,[object Object],:
result = ,[object Object],(,[object Object],.read_buffer[:size])
,[object Object],.read_buffer = ,[object Object],.read_buffer[size:]
,[object Object], result
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
line_endings = [,[object Object],, ,[object Object],, ,[object Object],]
,[object Object], ,[object Object],.buffer_lock:
,[object Object],
,[object Object], ,[object Object],:
,[object Object],
,[object Object], ending ,[object Object], line_endings:
end_pos = ,[object Object],.read_buffer.find(ending)
,[object Object], end_pos != -,[object Object],:
,[object Object],
line = ,[object Object],(,[object Object],.read_buffer[:end_pos + ,[object Object],(ending)])
,[object Object],.read_buffer = ,[object Object],.read_buffer[end_pos + ,[object Object],(ending):]
,[object Object], line
,[object Object],
available = ,[object Object],.serial.in_waiting
,[object Object], available > ,[object Object],:
new_data = ,[object Object],.serial.read(available)
,[object Object],.read_buffer.extend(new_data)
,[object Object],:
,[object Object],
,[object Object], max_size ,[object Object], ,[object Object],(,[object Object],.read_buffer) >= max_size:
,[object Object],
line = ,[object Object],(,[object Object],.read_buffer[:max_size])
,[object Object],.read_buffer = ,[object Object],.read_buffer[max_size:]
,[object Object], line
,[object Object],
,[object Object], ,[object Object],.read_buffer:
line = ,[object Object],(,[object Object],.read_buffer)
,[object Object],.read_buffer.clear()
,[object Object], line
,[object Object], ,[object Object], ,[object Object],Building Robust Device Classes
Creating well-structured device classes forms the foundation of maintainable AV control applications. This section demonstrates professional patterns for building reliable, reusable device interfaces.
Base Device Architecture
python
[object Object], abc ,[object Object], ABC, abstractmethod
,[object Object], threading
,[object Object], time
,[object Object], logging
,[object Object], typing ,[object Object], ,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],
,[object Object], enum ,[object Object], Enum
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
DISCONNECTED = ,[object Object],
CONNECTING = ,[object Object],
CONNECTED = ,[object Object],
ERROR = ,[object Object],
BUSY = ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
UNKNOWN = ,[object Object],
OFF = ,[object Object],
ON = ,[object Object],
STANDBY = ,[object Object],
WARMING = ,[object Object],
COOLING = ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],.device_id = device_id
,[object Object],.port = port
,[object Object],.config = kwargs
,[object Object],
,[object Object],.state = DeviceState.DISCONNECTED
,[object Object],.power_state = PowerState.UNKNOWN
,[object Object],.last_response_time = ,[object Object],
,[object Object],.error_count = ,[object Object],
,[object Object],
,[object Object],.command_lock = threading.Lock()
,[object Object],.state_lock = threading.Lock()
,[object Object],
,[object Object],.state_callbacks = []
,[object Object],.error_callbacks = []
,[object Object],
,[object Object],.logger = logging.getLogger(,[object Object],)
,[object Object],
,[object Object],.serial = ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],.state_callbacks.append(callback)
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],.error_callbacks.append(callback)
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], callback ,[object Object], ,[object Object],.state_callbacks:
,[object Object],:
callback(,[object Object],, old_state, new_state)
,[object Object], Exception ,[object Object], e:
,[object Object],.logger.error(,[object Object],)
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], callback ,[object Object], ,[object Object],.error_callbacks:
,[object Object],:
callback(,[object Object],, error)
,[object Object], Exception ,[object Object], e:
,[object Object],.logger.error(,[object Object],)
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],.state_lock:
old_state = ,[object Object],.state
,[object Object],.state = new_state
,[object Object], old_state != new_state:
,[object Object],.logger.info(,[object Object],)
,[object Object],._notify_state_change(old_state, new_state)
,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object], ,[object Object],.state == DeviceState.CONNECTED
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
,[object Object], ,[object Object],(,[object Object],, ,[object Object],, ,[object Object],)
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],().__init__(device_id, port, **kwargs)
,[object Object],
,[object Object],.baudrate = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],.timeout = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],.retry_count = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],.retry_delay = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],
,[object Object],.command_terminator = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],.response_terminator = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],.command_delay = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],
,[object Object],.status_interval = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],.status_thread = ,[object Object],
,[object Object],.status_running = ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object], ,[object Object],.state == DeviceState.CONNECTED:
,[object Object], ,[object Object],
,[object Object],._set_state(DeviceState.CONNECTING)
,[object Object],:
,[object Object],
,[object Object],.serial = serial.Serial(
port=,[object Object],.port,
baudrate=,[object Object],.baudrate,
timeout=,[object Object],.timeout,
bytesize=,[object Object],,
parity=,[object Object],,
stopbits=,[object Object],
)
,[object Object],
time.sleep(,[object Object],)
,[object Object],
,[object Object], ,[object Object],._test_communication():
,[object Object],._set_state(DeviceState.CONNECTED)
,[object Object],.error_count = ,[object Object],
,[object Object],.last_response_time = time.time()
,[object Object],
,[object Object],._start_status_monitoring()
,[object Object],.logger.info(,[object Object],)
,[object Object], ,[object Object],
,[object Object],:
,[object Object],.serial.close()
,[object Object],.serial = ,[object Object],
,[object Object],._set_state(DeviceState.ERROR)
,[object Object], ,[object Object],
,[object Object], Exception ,[object Object], e:
,[object Object],.logger.error(,[object Object],)
,[object Object],._last_error = ,[object Object],(e)
,[object Object],._set_state(DeviceState.ERROR)
,[object Object],._notify_error(e)
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],._stop_status_monitoring()
,[object Object], ,[object Object],.serial ,[object Object], ,[object Object],.serial.is_open:
,[object Object],.serial.close()
,[object Object],.serial = ,[object Object],
,[object Object],._set_state(DeviceState.DISCONNECTED)
,[object Object],.logger.info(,[object Object],)
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
,[object Object], ,[object Object], ,[object Object],.is_connected():
,[object Object],.logger.error(,[object Object],)
,[object Object], ,[object Object],
timeout = timeout ,[object Object], ,[object Object],.timeout
retries = retries ,[object Object], retries ,[object Object], ,[object Object], ,[object Object], ,[object Object], ,[object Object],.retry_count
,[object Object], ,[object Object],.command_lock:
,[object Object],._set_state(DeviceState.BUSY)
,[object Object],:
,[object Object], attempt ,[object Object], ,[object Object],(retries + ,[object Object],):
,[object Object],:
,[object Object],
full_command = command + ,[object Object],.command_terminator
,[object Object],.serial.write(full_command.encode())
,[object Object],.logger.debug(,[object Object],)
,[object Object],
old_timeout = ,[object Object],.serial.timeout
,[object Object],.serial.timeout = timeout
response = ,[object Object],.serial.readline().decode().strip()
,[object Object],.serial.timeout = old_timeout
,[object Object], response:
,[object Object],.logger.debug(,[object Object],)
,[object Object],.last_response_time = time.time()
,[object Object],.error_count = ,[object Object],
,[object Object],._set_state(DeviceState.CONNECTED)
,[object Object], response
,[object Object],:
,[object Object],.logger.warning(,[object Object],)
,[object Object], Exception ,[object Object], e:
,[object Object],.logger.warning(,[object Object],)
,[object Object], attempt < retries:
time.sleep(,[object Object],.retry_delay)
,[object Object],:
,[object Object],
,[object Object],
,[object Object],.error_count += ,[object Object],
,[object Object],._set_state(DeviceState.ERROR)
,[object Object], ,[object Object],
,[object Object], Exception ,[object Object], e:
,[object Object],.logger.error(,[object Object],)
,[object Object],._last_error = ,[object Object],(e)
,[object Object],.error_count += ,[object Object],
,[object Object],._set_state(DeviceState.ERROR)
,[object Object],._notify_error(e)
,[object Object], ,[object Object],
,[object Object],:
,[object Object], ,[object Object],.state == DeviceState.BUSY:
,[object Object],._set_state(DeviceState.CONNECTED)
time.sleep(,[object Object],.command_delay)
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],.status_interval > ,[object Object], ,[object Object], ,[object Object], ,[object Object],.status_running:
,[object Object],.status_running = ,[object Object],
,[object Object],.status_thread = threading.Thread(
target=,[object Object],._status_monitor_loop,
daemon=,[object Object],
)
,[object Object],.status_thread.start()
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],.status_running = ,[object Object],
,[object Object], ,[object Object],.status_thread:
,[object Object],.status_thread.join(timeout=,[object Object],)
,[object Object],.status_thread = ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],.status_running ,[object Object], ,[object Object],.is_connected():
,[object Object],:
status = ,[object Object],.get_status()
,[object Object], status:
,[object Object],._process_status_update(status)
time.sleep(,[object Object],.status_interval)
,[object Object], Exception ,[object Object], e:
,[object Object],.logger.error(,[object Object],)
time.sleep(,[object Object],) ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],().__init__(device_id, port, **kwargs)
,[object Object],
,[object Object],.warm_up_time = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],.cool_down_time = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],.lamp_hours = ,[object Object],
,[object Object],.filter_hours = ,[object Object],
,[object Object],.current_input = ,[object Object],
,[object Object],
,[object Object],.commands = {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
}
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object],:
response = ,[object Object],.send_command(,[object Object],.commands[,[object Object],])
,[object Object], response ,[object Object], ,[object Object], ,[object Object],
,[object Object], Exception:
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
response = ,[object Object],.send_command(,[object Object],.commands[,[object Object],])
,[object Object], response ,[object Object], ,[object Object], ,[object Object], response:
,[object Object],.power_state = PowerState.WARMING
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
response = ,[object Object],.send_command(,[object Object],.commands[,[object Object],])
,[object Object], response ,[object Object], ,[object Object], ,[object Object], response:
,[object Object],.power_state = PowerState.COOLING
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
command_key = ,[object Object],
,[object Object], command_key ,[object Object], ,[object Object],.commands:
response = ,[object Object],.send_command(,[object Object],.commands[command_key])
,[object Object], response ,[object Object], ,[object Object], ,[object Object], response:
,[object Object],.current_input = input_source
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
status = {
,[object Object],: ,[object Object],.power_state.value,
,[object Object],: ,[object Object],.current_input,
,[object Object],: ,[object Object],.lamp_hours,
,[object Object],: ,[object Object],.filter_hours,
,[object Object],: ,[object Object],.error_count,
,[object Object],: ,[object Object],.last_response_time
}
,[object Object],
response = ,[object Object],.send_command(,[object Object],.commands[,[object Object],])
,[object Object], response:
,[object Object],
status[,[object Object],] = response
,[object Object], status
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],
raw_status = status.get(,[object Object],, ,[object Object],)
,[object Object], ,[object Object], ,[object Object], raw_status:
,[object Object],.power_state = PowerState.ON
,[object Object], ,[object Object], ,[object Object], raw_status:
,[object Object],.power_state = PowerState.OFF
,[object Object], ,[object Object], ,[object Object], raw_status:
,[object Object],.power_state = PowerState.WARMING
,[object Object], ,[object Object], ,[object Object], raw_status:
,[object Object],.power_state = PowerState.COOLING
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],(,[object Object],)
,[object Object], ,[object Object],(,[object Object],):
,[object Object],(,[object Object],)
,[object Object],
projector = GenericProjector(,[object Object],, ,[object Object],)
projector.add_state_callback(device_state_changed)
projector.add_error_callback(device_error_occurred)
,[object Object],
,[object Object], projector.connect():
projector.power_on()
time.sleep(,[object Object],)
projector.set_input(,[object Object],)
status = projector.get_status()
,[object Object],(,[object Object],)
projector.disconnect()Error Handling and Recovery Strategies
Robust error handling is essential for professional AV control systems that must operate reliably in mission-critical environments. This section covers comprehensive error management strategies.
Exception Hierarchy
python
[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],().__init__(message)
,[object Object],.device_id = device_id
,[object Object],.error_code = error_code
,[object Object],.timestamp = time.time()
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],
,[object Object], ,[object Object],:
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],.error_handlers = {}
,[object Object],.recovery_strategies = {}
,[object Object],.error_history = []
,[object Object],.max_history = ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],.error_handlers[error_type] = handler
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],.recovery_strategies[error_type] = strategy
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object],
,[object Object],._log_error(error, device)
,[object Object],
handler = ,[object Object],._find_handler(,[object Object],(error))
,[object Object], handler:
,[object Object],:
,[object Object], handler(error, device)
,[object Object], Exception ,[object Object], e:
,[object Object],._log_error(e, device, is_handler_error=,[object Object],)
,[object Object],
strategy = ,[object Object],._find_recovery_strategy(,[object Object],(error))
,[object Object], strategy:
,[object Object],:
,[object Object], strategy(error, device)
,[object Object], Exception ,[object Object], e:
,[object Object],._log_error(e, device, is_recovery_error=,[object Object],)
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
,[object Object],
,[object Object], error_type ,[object Object], ,[object Object],.error_handlers:
,[object Object], ,[object Object],.error_handlers[error_type]
,[object Object],
,[object Object], registered_type, handler ,[object Object], ,[object Object],.error_handlers.items():
,[object Object], ,[object Object],(error_type, registered_type):
,[object Object], handler
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
,[object Object],
,[object Object], error_type ,[object Object], ,[object Object],.recovery_strategies:
,[object Object], ,[object Object],.recovery_strategies[error_type]
,[object Object],
,[object Object], registered_type, strategy ,[object Object], ,[object Object],.recovery_strategies.items():
,[object Object], ,[object Object],(error_type, registered_type):
,[object Object], strategy
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
error_entry = {
,[object Object],: time.time(),
,[object Object],: device.device_id,
,[object Object],: ,[object Object],(error).__name__,
,[object Object],: ,[object Object],(error),
,[object Object],: is_handler_error,
,[object Object],: is_recovery_error
}
,[object Object],.error_history.append(error_entry)
,[object Object],
,[object Object], ,[object Object],(,[object Object],.error_history) > ,[object Object],.max_history:
,[object Object],.error_history = ,[object Object],.error_history[-,[object Object],.max_history:]
,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
logging.info(,[object Object],)
,[object Object],
time.sleep(,[object Object],)
,[object Object],
,[object Object],:
device.disconnect()
,[object Object], Exception:
,[object Object], ,[object Object],
,[object Object],
time.sleep(,[object Object],)
,[object Object],
,[object Object], attempt ,[object Object], ,[object Object],(,[object Object],):
,[object Object],:
,[object Object], device.connect():
logging.info(,[object Object],)
,[object Object], ,[object Object],
,[object Object], Exception ,[object Object], e:
logging.warning(,[object Object],)
time.sleep(,[object Object],)
logging.error(,[object Object],)
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
logging.info(,[object Object],)
,[object Object],
,[object Object], ,[object Object],(device, ,[object Object],) ,[object Object], device.serial:
,[object Object],:
device.serial.reset_input_buffer()
device.serial.reset_output_buffer()
,[object Object], Exception:
,[object Object],
,[object Object],
,[object Object],:
response = device.send_command(,[object Object],, timeout=,[object Object],, retries=,[object Object],)
,[object Object], response:
logging.info(,[object Object],)
,[object Object], ,[object Object],
,[object Object], Exception:
,[object Object],
,[object Object],
,[object Object], connection_error_recovery(error, device)
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
logging.info(,[object Object],)
,[object Object],
,[object Object], ,[object Object],(device, ,[object Object],):
device._reset_protocol_state()
,[object Object],
,[object Object], ,[object Object],(device, ,[object Object],) ,[object Object], device.serial:
,[object Object],:
device.serial.reset_input_buffer()
device.serial.reset_output_buffer()
,[object Object], Exception:
,[object Object],
,[object Object],
time.sleep(,[object Object],)
,[object Object],
,[object Object],:
response = device.send_command(,[object Object],, timeout=,[object Object],)
,[object Object], response:
logging.info(,[object Object],)
,[object Object], ,[object Object],
,[object Object], Exception:
,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],().__init__(device_id, port, **kwargs)
,[object Object],
,[object Object],.error_manager = ErrorRecoveryManager()
,[object Object],._setup_error_handling()
,[object Object],
,[object Object],.health_check_interval = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],.max_consecutive_errors = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],.consecutive_error_count = ,[object Object],
,[object Object],
,[object Object],.auto_recovery_enabled = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],.recovery_attempt_limit = kwargs.get(,[object Object],, ,[object Object],)
,[object Object],.current_recovery_attempts = ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],
,[object Object],.error_manager.register_recovery_strategy(
DeviceConnectionError, connection_error_recovery)
,[object Object],.error_manager.register_recovery_strategy(
DeviceTimeoutError, timeout_error_recovery)
,[object Object],.error_manager.register_recovery_strategy(
DeviceProtocolError, protocol_error_recovery)
,[object Object],
,[object Object],.error_manager.register_error_handler(
DeviceConnectionError, ,[object Object],._handle_connection_error)
,[object Object],.error_manager.register_error_handler(
DeviceTimeoutError, ,[object Object],._handle_timeout_error)
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
,[object Object],:
response = ,[object Object],().send_command(command, **kwargs)
,[object Object], response ,[object Object], ,[object Object], ,[object Object],:
,[object Object],
,[object Object],.consecutive_error_count = ,[object Object],
,[object Object],.current_recovery_attempts = ,[object Object],
,[object Object], response
,[object Object], Exception ,[object Object], e:
,[object Object], ,[object Object],._handle_command_error(e, command, **kwargs)
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
,[object Object],.consecutive_error_count += ,[object Object],
,[object Object],
,[object Object], ,[object Object],(error, serial.SerialTimeoutException):
av_error = DeviceTimeoutError(,[object Object],(error), ,[object Object],.device_id)
,[object Object], ,[object Object],(error, serial.SerialException):
av_error = DeviceConnectionError(,[object Object],(error), ,[object Object],.device_id)
,[object Object],:
av_error = DeviceProtocolError(,[object Object],(error), ,[object Object],.device_id)
,[object Object],
,[object Object], (,[object Object],.auto_recovery_enabled ,[object Object],
,[object Object],.current_recovery_attempts < ,[object Object],.recovery_attempt_limit):
,[object Object],.current_recovery_attempts += ,[object Object],
,[object Object], ,[object Object],.error_manager.handle_error(av_error, ,[object Object],):
,[object Object],
,[object Object],:
,[object Object], ,[object Object],().send_command(command, **kwargs)
,[object Object], Exception ,[object Object], retry_error:
,[object Object],
,[object Object],._notify_error(av_error)
,[object Object], ,[object Object],
,[object Object],
,[object Object], ,[object Object],.consecutive_error_count >= ,[object Object],.max_consecutive_errors:
,[object Object],._set_state(DeviceState.ERROR)
,[object Object],._notify_error(av_error)
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object],.logger.error(,[object Object],)
,[object Object],._set_state(DeviceState.ERROR)
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
,[object Object],.logger.warning(,[object Object],)
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
,[object Object], {
,[object Object],: ,[object Object],.consecutive_error_count,
,[object Object],: ,[object Object],.error_count,
,[object Object],: ,[object Object],.current_recovery_attempts,
,[object Object],: ,[object Object],.error_manager.error_history[-,[object Object],:], ,[object Object],
,[object Object],: ,[object Object],.state.value
}
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],.consecutive_error_count = ,[object Object],
,[object Object],.current_recovery_attempts = ,[object Object],
,[object Object],.error_count = ,[object Object],
,[object Object], ,[object Object],.state == DeviceState.ERROR:
,[object Object],._set_state(DeviceState.DISCONNECTED)Real-Time Control Implementation
Real-time control capabilities are essential for responsive AV systems. This section covers threading, asynchronous operations, and performance optimization techniques.
Multi-threaded Command Processing
python
[object Object], asyncio
,[object Object], concurrent.futures
,[object Object], dataclasses ,[object Object], dataclass
,[object Object], typing ,[object Object], ,[object Object],, Awaitable
,[object Object], queue
,[object Object],
,[object Object], ,[object Object],:
,[object Object],
device_id: ,[object Object],
command: ,[object Object],
priority: ,[object Object], = ,[object Object],
timeout: ,[object Object], = ,[object Object],
callback: ,[object Object],[,[object Object],] = ,[object Object],
future: ,[object Object],[concurrent.futures.Future] = ,[object Object],
timestamp: ,[object Object], = ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object], ,[object Object],.timestamp ,[object Object], ,[object Object],:
,[object Object],.timestamp = time.time()
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],.priority < other.priority
,[object Object], ,[object Object],:
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],.devices = {}
,[object Object],.max_workers = max_workers
,[object Object],
,[object Object],.command_queue = queue.PriorityQueue()
,[object Object],.worker_threads = []
,[object Object],.thread_pool = concurrent.futures.ThreadPoolExecutor(
max_workers=max_workers)
,[object Object],
,[object Object],.async_loop = ,[object Object],
,[object Object],.async_tasks = ,[object Object],()
,[object Object],
,[object Object],.running = ,[object Object],
,[object Object],.shutdown_event = threading.Event()
,[object Object],
,[object Object],.command_stats = {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: []
}
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],.devices[device.device_id] = device
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],.running:
,[object Object],
,[object Object],.running = ,[object Object],
,[object Object],.shutdown_event.clear()
,[object Object],
,[object Object], i ,[object Object], ,[object Object],(,[object Object],.max_workers):
worker = threading.Thread(
target=,[object Object],._worker_thread,
name=,[object Object],,
daemon=,[object Object],
)
worker.start()
,[object Object],.worker_threads.append(worker)
,[object Object],
,[object Object],.async_thread = threading.Thread(
target=,[object Object],._async_event_loop,
daemon=,[object Object],
)
,[object Object],.async_thread.start()
logging.info(,[object Object],)
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object], ,[object Object],.running:
,[object Object],
,[object Object],.running = ,[object Object],
,[object Object],.shutdown_event.,[object Object],()
,[object Object],
,[object Object], worker ,[object Object], ,[object Object],.worker_threads:
worker.join(timeout=,[object Object],)
,[object Object],
,[object Object],.thread_pool.shutdown(wait=,[object Object],)
,[object Object],
,[object Object], ,[object Object],.async_loop ,[object Object], ,[object Object], ,[object Object],.async_loop.is_closed():
,[object Object], task ,[object Object], ,[object Object],.async_tasks:
task.cancel()
logging.info(,[object Object],)
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
future = concurrent.futures.Future()
request = CommandRequest(
device_id=device_id,
command=command,
priority=priority,
timeout=timeout,
future=future
)
,[object Object],.command_queue.put((priority, request))
,[object Object],:
,[object Object], future.result(timeout=timeout + ,[object Object],)
,[object Object], concurrent.futures.TimeoutError:
logging.error(,[object Object],)
,[object Object], ,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
request = CommandRequest(
device_id=device_id,
command=command,
priority=priority,
timeout=timeout,
callback=callback
)
,[object Object],.command_queue.put((priority, request))
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],[,[object Object],]]:
,[object Object],
futures = []
,[object Object], cmd_info ,[object Object], commands:
future = concurrent.futures.Future()
request = CommandRequest(
device_id=cmd_info[,[object Object],],
command=cmd_info[,[object Object],],
priority=cmd_info.get(,[object Object],, ,[object Object],),
timeout=cmd_info.get(,[object Object],, ,[object Object],),
future=future
)
,[object Object],.command_queue.put((request.priority, request))
futures.append(future)
,[object Object], wait_for_completion:
results = []
,[object Object], future ,[object Object], futures:
,[object Object],:
result = future.result(timeout=,[object Object],)
results.append(result)
,[object Object], Exception:
results.append(,[object Object],)
,[object Object], results
,[object Object], futures
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], ,[object Object],.running ,[object Object], ,[object Object], ,[object Object],.shutdown_event.is_set():
,[object Object],:
,[object Object],
priority, request = ,[object Object],.command_queue.get(timeout=,[object Object],)
,[object Object],
,[object Object],._process_command_request(request)
,[object Object],.command_queue.task_done()
,[object Object], queue.Empty:
,[object Object],
,[object Object], Exception ,[object Object], e:
logging.error(,[object Object],)
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
start_time = time.time()
,[object Object],:
device = ,[object Object],.devices.get(request.device_id)
,[object Object], ,[object Object], device:
,[object Object], ValueError(,[object Object],)
,[object Object],
response = device.send_command(request.command,
timeout=request.timeout)
,[object Object],
response_time = time.time() - start_time
,[object Object],._update_stats(response_time, success=,[object Object],)
,[object Object],
,[object Object], request.future:
request.future.set_result(response)
,[object Object], request.callback:
request.callback(request, response, ,[object Object],)
,[object Object], Exception ,[object Object], e:
,[object Object],
response_time = time.time() - start_time
,[object Object],._update_stats(response_time, success=,[object Object],)
,[object Object],
,[object Object], request.future:
request.future.set_exception(e)
,[object Object], request.callback:
request.callback(request, ,[object Object],, e)
logging.error(,[object Object],)
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],.command_stats[,[object Object],] += ,[object Object],
,[object Object], success:
,[object Object],.command_stats[,[object Object],] += ,[object Object],
,[object Object],:
,[object Object],.command_stats[,[object Object],] += ,[object Object],
,[object Object],
,[object Object],.command_stats[,[object Object],].append(response_time)
,[object Object],
,[object Object], ,[object Object],(,[object Object],.command_stats[,[object Object],]) > ,[object Object],:
,[object Object],.command_stats[,[object Object],] = \
,[object Object],.command_stats[,[object Object],][-,[object Object],:]
,[object Object],
times = ,[object Object],.command_stats[,[object Object],]
,[object Object],.command_stats[,[object Object],] = ,[object Object],(times) / ,[object Object],(times)
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],.async_loop = asyncio.new_event_loop()
asyncio.set_event_loop(,[object Object],.async_loop)
,[object Object],:
,[object Object],.async_loop.run_forever()
,[object Object], Exception ,[object Object], e:
logging.error(,[object Object],)
,[object Object],:
,[object Object],.async_loop.close()
,[object Object], ,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
loop = asyncio.get_event_loop()
,[object Object],
future = loop.run_in_executor(
,[object Object],.thread_pool,
,[object Object],.send_command_sync,
device_id, command, ,[object Object],, timeout
)
,[object Object], ,[object Object], future
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
stats = ,[object Object],.command_stats.copy()
,[object Object],
,[object Object], stats[,[object Object],]:
times = stats[,[object Object],]
stats[,[object Object],] = ,[object Object],(times)
stats[,[object Object],] = ,[object Object],(times)
stats[,[object Object],] = ,[object Object],(times)[,[object Object],(times) // ,[object Object],]
,[object Object],
,[object Object], stats[,[object Object],] > ,[object Object],:
stats[,[object Object],] = (stats[,[object Object],] /
stats[,[object Object],]) * ,[object Object],
,[object Object],:
stats[,[object Object],] = ,[object Object],
,[object Object],
stats[,[object Object],] = ,[object Object],.command_queue.qsize()
stats[,[object Object],] = ,[object Object],([t ,[object Object], t ,[object Object], ,[object Object],.worker_threads ,[object Object], t.is_alive()])
,[object Object], stats
,[object Object],
,[object Object], ,[object Object],:
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],.rt_controller = rt_controller
,[object Object],.scenes = {}
,[object Object],.macros = {}
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],.scenes[scene_name] = commands
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], scene_name ,[object Object], ,[object Object], ,[object Object],.scenes:
,[object Object], ValueError(,[object Object],)
commands = ,[object Object],.scenes[scene_name]
,[object Object],
,[object Object], i, cmd ,[object Object], ,[object Object],(commands):
,[object Object],
,[object Object], i > ,[object Object],:
time.sleep(delay_between_commands)
,[object Object],.rt_controller.send_command_async(
device_id=cmd[,[object Object],],
command=cmd[,[object Object],],
priority=cmd.get(,[object Object],, ,[object Object],)
)
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],.macros[macro_name] = function
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], macro_name ,[object Object], ,[object Object], ,[object Object],.macros:
,[object Object], ValueError(,[object Object],)
,[object Object], ,[object Object],.macros[macro_name](,[object Object],.rt_controller, *args, **kwargs)
,[object Object],
,[object Object], ,[object Object],():
,[object Object],
rt_controller = RealTimeAVController(max_workers=,[object Object],)
,[object Object],
projector = GenericProjector(,[object Object],, ,[object Object],)
display = GenericProjector(,[object Object],, ,[object Object],) ,[object Object],
,[object Object],
rt_controller.register_device(projector)
rt_controller.register_device(display)
,[object Object],
projector.connect()
display.connect()
,[object Object],
rt_controller.start()
,[object Object],
system = AVSystemController(rt_controller)
,[object Object],
presentation_scene = [
{,[object Object],: ,[object Object],, ,[object Object],: ,[object Object],, ,[object Object],: ,[object Object],},
{,[object Object],: ,[object Object],, ,[object Object],: ,[object Object],, ,[object Object],: ,[object Object],},
{,[object Object],: ,[object Object],, ,[object Object],: ,[object Object],, ,[object Object],: ,[object Object],},
{,[object Object],: ,[object Object],, ,[object Object],: ,[object Object],, ,[object Object],: ,[object Object],}
]
system.define_scene(,[object Object],, presentation_scene)
,[object Object],
system.activate_scene(,[object Object],)
,[object Object],
time.sleep(,[object Object],)
stats = rt_controller.get_performance_stats()
,[object Object],(,[object Object],)
,[object Object],
rt_controller.stop()
projector.disconnect()
display.disconnect()
,[object Object], __name__ == ,[object Object],:
main()Cross-Platform Deployment
Deploying Python AV control applications across different platforms requires careful consideration of system-specific differences and dependencies. This section covers packaging, distribution, and deployment strategies.
Packaging for Distribution
python
[object Object],
,[object Object], setuptools ,[object Object], setup, find_packages
,[object Object], os
,[object Object],
,[object Object], ,[object Object],(,[object Object],, ,[object Object],, encoding=,[object Object],) ,[object Object], fh:
long_description = fh.read()
,[object Object],
,[object Object], ,[object Object],(,[object Object],, ,[object Object],, encoding=,[object Object],) ,[object Object], fh:
requirements = [line.strip() ,[object Object], line ,[object Object], fh ,[object Object], line.strip() ,[object Object], ,[object Object], line.startswith(,[object Object],)]
setup(
name=,[object Object],,
version=,[object Object],,
author=,[object Object],,
author_email=,[object Object],,
description=,[object Object],,
long_description=long_description,
long_description_content_type=,[object Object],,
url=,[object Object],,
packages=find_packages(),
classifiers=[
,[object Object],,
,[object Object],,
,[object Object],,
,[object Object],,
,[object Object],,
,[object Object],,
,[object Object],,
,[object Object],,
,[object Object],,
,[object Object],,
,[object Object],,
],
python_requires=,[object Object],,
install_requires=requirements,
extras_require={
,[object Object],: [
,[object Object],,
,[object Object],,
,[object Object],,
,[object Object],,
,[object Object],,
],
,[object Object],: [
,[object Object],,
,[object Object],,
],
,[object Object],: [
,[object Object],,
,[object Object],,
]
},
entry_points={
,[object Object],: [
,[object Object],,
,[object Object],,
,[object Object],,
],
},
include_package_data=,[object Object],,
package_data={
,[object Object],: [
,[object Object],,
,[object Object],,
,[object Object],,
,[object Object],,
],
},
)Platform-Specific Installation Scripts
Windows Installation Script (install_windows.bat):
batch
@echo off
echo Installing AV Control System for Windows...
REM Check Python installation
python --version >nul 2>&1
if errorlevel 1 (
echo Error: Python is not installed or not in PATH
echo Please install Python 3.8 or later from python.org
pause
exit /b 1
)
REM Create virtual environment
echo Creating virtual environment...
python -m venv av_control_env
REM Activate virtual environment
call av_control_env\Scripts\activate.bat
REM Update pip
python -m pip install --upgrade pip
REM Install dependencies
echo Installing dependencies...
pip install -r requirements.txt
REM Install FTDI drivers if needed
echo.
echo Note: If you're using FTDI USB-Serial adapters, you may need to install
echo FTDI VCP drivers from https://ftdichip.com/drivers/vcp-drivers/
echo.
REM Create desktop shortcut
echo Creating desktop shortcut...
set "desktop=%USERPROFILE%\Desktop"
set "shortcut=%desktop%\AV Control System.lnk"
powershell -Command "$WshShell = New-Object -comObject WScript.Shell; $Shortcut = $WshShell.CreateShortcut('%shortcut%'); $Shortcut.TargetPath = '%CD%\av_control_env\Scripts\python.exe'; $Shortcut.Arguments = '-m av_control.gui'; $Shortcut.WorkingDirectory = '%CD%'; $Shortcut.Save()"
echo.
echo Installation complete!
echo To start the AV Control System, run: av_control_env\Scripts\activate.bat
echo Then: python -m av_control.gui
pausemacOS Installation Script (install_macos.sh):
bash
[object Object],
,[object Object], -e
,[object Object], ,[object Object],
,[object Object],
,[object Object], ! ,[object Object], -v python3 &> /dev/null; ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], 1
,[object Object],
,[object Object],
python_version=$(python3 -c ,[object Object],)
required_version=,[object Object],
,[object Object], ! python3 -c ,[object Object],; ,[object Object],
,[object Object], ,[object Object],
,[object Object], 1
,[object Object],
,[object Object], ,[object Object],
,[object Object],
,[object Object], ,[object Object],
python3 -m venv av_control_env
,[object Object],
,[object Object], av_control_env/bin/activate
,[object Object],
python -m pip install --upgrade pip
,[object Object],
,[object Object], ,[object Object],
pip install -r requirements.txt
,[object Object],
,[object Object], ,[object Object],
,[object Object], dseditgroup -o edit -a $(,[object Object],) -t user _developer 2>/dev/null || ,[object Object],
,[object Object],
,[object Object], ,[object Object], -v platypus &> /dev/null; ,[object Object],
,[object Object], ,[object Object],
platypus -a ,[object Object], -o ,[object Object], -p ,[object Object], -V ,[object Object], -u ,[object Object], -i ,[object Object], -f ,[object Object], -f ,[object Object], ,[object Object], ,[object Object], ,[object Object], ,[object Object],
,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],Linux Installation Script (install_linux.sh):
bash
[object Object],
,[object Object], -e
,[object Object], ,[object Object],
,[object Object],
,[object Object], [ -f /etc/os-release ]; ,[object Object],
. /etc/os-release
OS=,[object Object],
VER=,[object Object],
,[object Object],
,[object Object], ,[object Object],
,[object Object], 1
,[object Object],
,[object Object], ,[object Object],
,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object], ,[object Object],
,[object Object],*|,[object Object],*)
,[object Object], apt-get update
,[object Object], apt-get install -y python3 python3-pip python3-venv python3-dev
,[object Object],
,[object Object], apt-get install -y udev
;;
,[object Object],*|,[object Object],*|,[object Object],*)
,[object Object], ,[object Object], -v dnf &> /dev/null; ,[object Object],
,[object Object], dnf install -y python3 python3-pip python3-devel
,[object Object],
,[object Object], yum install -y python3 python3-pip python3-devel
,[object Object],
;;
,[object Object],*)
,[object Object], pacman -S python python-pip
;;
*)
,[object Object], ,[object Object],
,[object Object], ,[object Object],
;;
,[object Object],
,[object Object],
,[object Object], ! ,[object Object], -v python3 &> /dev/null; ,[object Object],
,[object Object], ,[object Object],
,[object Object], 1
,[object Object],
python_version=$(python3 -c ,[object Object],)
,[object Object], ,[object Object],
,[object Object], ! python3 -c ,[object Object],; ,[object Object],
,[object Object], ,[object Object],
,[object Object], 1
,[object Object],
,[object Object],
,[object Object], ,[object Object],
python3 -m venv av_control_env
,[object Object],
,[object Object], av_control_env/bin/activate
,[object Object],
python -m pip install --upgrade pip
,[object Object],
,[object Object], ,[object Object],
pip install -r requirements.txt
,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object], /etc/udev/rules.d/99-av-control-serial.rules > /dev/null << ,[object Object],
,[object Object],
SUBSYSTEM==,[object Object],, ATTRS{idVendor}==,[object Object],, ATTRS{idProduct}==,[object Object],, MODE=,[object Object],, GROUP=,[object Object],
SUBSYSTEM==,[object Object],, ATTRS{idVendor}==,[object Object],, ATTRS{idProduct}==,[object Object],, MODE=,[object Object],, GROUP=,[object Object],
,[object Object],
SUBSYSTEM==,[object Object],, ATTRS{idVendor}==,[object Object],, ATTRS{idProduct}==,[object Object],, MODE=,[object Object],, GROUP=,[object Object],
,[object Object],
SUBSYSTEM==,[object Object],, ATTRS{idVendor}==,[object Object],, ATTRS{idProduct}==,[object Object],, MODE=,[object Object],, GROUP=,[object Object],
,[object Object],
SUBSYSTEM==,[object Object],, ATTRS{idVendor}==,[object Object],, ATTRS{idProduct}==,[object Object],, MODE=,[object Object],, GROUP=,[object Object],
EOF
,[object Object],
,[object Object], udevadm control --reload-rules
,[object Object], udevadm trigger
,[object Object],
,[object Object], usermod -a -G dialout ,[object Object],
,[object Object],
,[object Object], ,[object Object],
,[object Object], -p ~/.local/share/applications
,[object Object], > ~/.local/share/applications/av-control-system.desktop << ,[object Object],
,[object Object],
,[object Object], -p ,[object Object], -n 1 -r
,[object Object],
,[object Object], [[ ,[object Object], =~ ^[Yy]$ ]]; ,[object Object],
,[object Object], ,[object Object], /etc/systemd/system/av-control.service > /dev/null << ,[object Object],
,[object Object], systemctl daemon-reload
,[object Object], systemctl ,[object Object], av-control.service
,[object Object], ,[object Object],
,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],
,[object Object], ,[object Object],Configuration Management
python
[object Object],
,[object Object], yaml
,[object Object], json
,[object Object], os
,[object Object], pathlib ,[object Object], Path
,[object Object], typing ,[object Object], ,[object Object],, ,[object Object],, ,[object Object],
,[object Object], logging
,[object Object], ,[object Object],:
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],.app_name = app_name
,[object Object],.config_dir = ,[object Object],._get_config_directory()
,[object Object],.config_file = ,[object Object],.config_dir / ,[object Object],
,[object Object],.device_config_file = ,[object Object],.config_dir / ,[object Object],
,[object Object],
,[object Object],.config_dir.mkdir(parents=,[object Object],, exist_ok=,[object Object],)
,[object Object],
,[object Object],.default_config = {
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],(,[object Object],.config_dir / ,[object Object],),
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
},
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
},
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
},
,[object Object],: {
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],
}
}
,[object Object],.config = {}
,[object Object],.device_configs = {}
,[object Object], ,[object Object],(,[object Object],) -> Path:
,[object Object],
home = Path.home()
system = os.name
,[object Object], system == ,[object Object],: ,[object Object],
config_dir = home / ,[object Object], / ,[object Object], / ,[object Object],.app_name
,[object Object], system == ,[object Object],:
,[object Object], ,[object Object], ,[object Object], os.uname().sysname.lower(): ,[object Object],
config_dir = home / ,[object Object], / ,[object Object], / ,[object Object],.app_name
,[object Object],: ,[object Object],
config_dir = home / ,[object Object], / ,[object Object],.app_name
,[object Object],:
,[object Object],
config_dir = home / ,[object Object],
,[object Object], config_dir
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
,[object Object],:
,[object Object], ,[object Object],.config_file.exists():
,[object Object], ,[object Object],(,[object Object],.config_file, ,[object Object],) ,[object Object], f:
file_config = yaml.safe_load(f)
,[object Object],
,[object Object],.config = ,[object Object],._merge_configs(,[object Object],.default_config, file_config)
,[object Object],:
,[object Object],.config = ,[object Object],.default_config.copy()
,[object Object],.save_config()
,[object Object], Exception ,[object Object], e:
logging.error(,[object Object],)
,[object Object],.config = ,[object Object],.default_config.copy()
,[object Object], ,[object Object],.config
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],:
,[object Object], ,[object Object],(,[object Object],.config_file, ,[object Object],) ,[object Object], f:
yaml.dump(,[object Object],.config, f, default_flow_style=,[object Object],, indent=,[object Object],)
,[object Object], Exception ,[object Object], e:
logging.error(,[object Object],)
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
,[object Object],:
,[object Object], ,[object Object],.device_config_file.exists():
,[object Object], ,[object Object],(,[object Object],.device_config_file, ,[object Object],) ,[object Object], f:
,[object Object],.device_configs = yaml.safe_load(f) ,[object Object], {}
,[object Object],:
,[object Object],.device_configs = {}
,[object Object],.save_device_configs()
,[object Object], Exception ,[object Object], e:
logging.error(,[object Object],)
,[object Object],.device_configs = {}
,[object Object], ,[object Object],.device_configs
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],:
,[object Object], ,[object Object],(,[object Object],.device_config_file, ,[object Object],) ,[object Object], f:
yaml.dump(,[object Object],.device_configs, f, default_flow_style=,[object Object],, indent=,[object Object],)
,[object Object], Exception ,[object Object], e:
logging.error(,[object Object],)
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],:
,[object Object],
result = default.copy()
,[object Object], key, value ,[object Object], override.items():
,[object Object], key ,[object Object], result ,[object Object], ,[object Object],(result[key], ,[object Object],) ,[object Object], ,[object Object],(value, ,[object Object],):
result[key] = ,[object Object],._merge_configs(result[key], value)
,[object Object],:
result[key] = value
,[object Object], result
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
keys = key_path.split(,[object Object],)
value = ,[object Object],.config
,[object Object],:
,[object Object], key ,[object Object], keys:
value = value[key]
,[object Object], value
,[object Object], (KeyError, TypeError):
,[object Object], default
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
keys = key_path.split(,[object Object],)
config = ,[object Object],.config
,[object Object], key ,[object Object], keys[:-,[object Object],]:
,[object Object], key ,[object Object], ,[object Object], config:
config[key] = {}
config = config[key]
config[keys[-,[object Object],]] = value
,[object Object],.save_config()This comprehensive guide provides a solid foundation for implementing Python PySerial-based AV control systems. The examples demonstrate professional-grade practices for real-world installations, including error handling, cross-platform compatibility, and performance optimization essential for mission-critical audiovisual environments.
Troubleshooting Common Issues
When deploying Python PySerial applications in professional AV environments, several common issues may arise. This section provides systematic approaches to identify and resolve these problems.
Port Access and Permissions
Windows Permission Issues:
python
[object Object], ctypes
,[object Object], sys
,[object Object], ,[object Object],():
,[object Object],
,[object Object],:
,[object Object], ctypes.windll.shell32.IsUserAnAdmin()
,[object Object],:
,[object Object], ,[object Object],
,[object Object], ,[object Object],():
,[object Object],
,[object Object], winreg
issues = []
,[object Object],
,[object Object], ,[object Object], is_admin():
issues.append(,[object Object],)
,[object Object],
,[object Object],:
,[object Object], winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE,
,[object Object],) ,[object Object], key:
,[object Object],
,[object Object], i ,[object Object], ,[object Object],(winreg.QueryInfoKey(key)[,[object Object],]):
subkey_name = winreg.EnumKey(key, i)
,[object Object],
,[object Object], Exception ,[object Object], e:
issues.append(,[object Object],)
,[object Object], issuesLinux Permission Resolution:
python
[object Object], os
,[object Object], subprocess
,[object Object], pwd
,[object Object], grp
,[object Object], ,[object Object],():
,[object Object],
current_user = pwd.getpwuid(os.getuid()).pw_name
steps = []
,[object Object],
,[object Object],:
dialout_group = grp.getgrnam(,[object Object],)
,[object Object], current_user ,[object Object], ,[object Object], dialout_group.gr_mem:
steps.append(,[object Object],)
steps.append(,[object Object],)
,[object Object], KeyError:
steps.append(,[object Object],)
,[object Object],
,[object Object],:
result = subprocess.run([,[object Object],, ,[object Object],, ,[object Object],],
capture_output=,[object Object],, text=,[object Object],)
,[object Object], result.returncode == ,[object Object],:
steps.append(,[object Object],)
steps.append(,[object Object],)
steps.append(,[object Object],)
,[object Object],:
,[object Object],
,[object Object], stepsDriver and Hardware Issues
python
[object Object], ,[object Object],:
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],.system = platform.system().lower()
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
diagnosis = {
,[object Object],: port,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: ,[object Object],,
,[object Object],: []
}
,[object Object],
,[object Object],:
,[object Object], serial.Serial(port, ,[object Object],, timeout=,[object Object],):
diagnosis[,[object Object],] = ,[object Object],
,[object Object], Exception ,[object Object], e:
diagnosis[,[object Object],] = ,[object Object],(e)
,[object Object],
diagnosis[,[object Object],] = ,[object Object],._get_hardware_info(port)
diagnosis[,[object Object],] = ,[object Object],._get_driver_info(port)
,[object Object],
diagnosis[,[object Object],] = ,[object Object],._generate_recommendations(diagnosis)
,[object Object], diagnosis
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
info = {}
,[object Object],:
,[object Object],
,[object Object], p ,[object Object], serial.tools.list_ports.comports():
,[object Object], p.device == port:
info = {
,[object Object],: p.vid,
,[object Object],: p.pid,
,[object Object],: p.serial_number,
,[object Object],: p.manufacturer,
,[object Object],: p.product,
,[object Object],: p.hwid
}
,[object Object],
,[object Object], Exception ,[object Object], e:
info[,[object Object],] = ,[object Object],(e)
,[object Object], info
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
info = {}
,[object Object], ,[object Object],.system == ,[object Object],:
info = ,[object Object],._get_windows_driver_info(port)
,[object Object], ,[object Object],.system == ,[object Object],:
info = ,[object Object],._get_linux_driver_info(port)
,[object Object], ,[object Object],.system == ,[object Object],:
info = ,[object Object],._get_macos_driver_info(port)
,[object Object], info
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
info = {}
,[object Object],:
,[object Object], subprocess
,[object Object],
cmd = ,[object Object],
result = subprocess.run([,[object Object],, ,[object Object],, cmd],
capture_output=,[object Object],, text=,[object Object],)
,[object Object], result.returncode == ,[object Object],:
info[,[object Object],] = result.stdout
,[object Object], Exception ,[object Object], e:
info[,[object Object],] = ,[object Object],(e)
,[object Object], info
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
info = {}
,[object Object],:
,[object Object],
device_name = os.path.basename(port)
driver_path = ,[object Object],
,[object Object], os.path.exists(driver_path):
info[,[object Object],] = os.readlink(driver_path)
info[,[object Object],] = os.path.basename(info[,[object Object],])
,[object Object],
,[object Object], ,[object Object],(,[object Object],, ,[object Object],) ,[object Object], f:
modules = f.read()
relevant_modules = []
,[object Object], module ,[object Object], [,[object Object],, ,[object Object],, ,[object Object],, ,[object Object],]:
,[object Object], module ,[object Object], modules:
relevant_modules.append(module)
info[,[object Object],] = relevant_modules
,[object Object], Exception ,[object Object], e:
info[,[object Object],] = ,[object Object],(e)
,[object Object], info
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],, ,[object Object],]:
,[object Object],
info = {}
,[object Object],:
,[object Object],
result = subprocess.run([,[object Object],, ,[object Object],],
capture_output=,[object Object],, text=,[object Object],)
,[object Object], result.returncode == ,[object Object],:
info[,[object Object],] = result.stdout
,[object Object], Exception ,[object Object], e:
info[,[object Object],] = ,[object Object],(e)
,[object Object], info
,[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],
recommendations = []
,[object Object], ,[object Object], diagnosis[,[object Object],]:
recommendations.extend([
,[object Object],,
,[object Object],,
,[object Object],,
,[object Object],
])
hw_info = diagnosis.get(,[object Object],, {})
,[object Object], hw_info.get(,[object Object],) == ,[object Object],: ,[object Object],
recommendations.extend([
,[object Object],,
,[object Object],,
,[object Object],
])
,[object Object], hw_info.get(,[object Object],) == ,[object Object],: ,[object Object],
recommendations.extend([
,[object Object],,
,[object Object],,
,[object Object],
])
,[object Object], ,[object Object],.system == ,[object Object],:
recommendations.extend([
,[object Object],,
,[object Object],,
,[object Object],
])
,[object Object], recommendations
,[object Object],
debugger = HardwareDebugger()
diagnosis = debugger.diagnose_usb_serial_adapter(,[object Object],)
,[object Object],(,[object Object],)Best Practices
Professional AV control applications require adherence to industry best practices to ensure reliability, maintainability, and scalability.
Code Organization
python
[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],
,[object Object],Testing Strategy
python
[object Object],
,[object Object], pytest
,[object Object], unittest.mock ,[object Object], mock
,[object Object], av_control.devices.projectors ,[object Object], GenericProjector
,[object Object], ,[object Object],:
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object], mock.patch(,[object Object],) ,[object Object], mock_ser:
mock_instance = mock.MagicMock()
mock_ser.return_value = mock_instance
,[object Object], mock_instance
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
proj = GenericProjector(,[object Object],, ,[object Object],)
proj.serial = mock_serial
proj._set_state(proj.DeviceState.CONNECTED)
,[object Object], proj
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
mock_serial.readline.return_value = ,[object Object],
result = projector.power_on()
,[object Object], result ,[object Object], ,[object Object],
mock_serial.write.assert_called_with(,[object Object],)
,[object Object], projector.power_state == projector.PowerState.WARMING
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
mock_serial.readline.return_value = ,[object Object],
result = projector.power_on()
,[object Object], result ,[object Object], ,[object Object],
,[object Object], projector.power_state != projector.PowerState.WARMING
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
,[object Object],
mock_serial.readline.side_effect = [,[object Object],, ,[object Object],]
result = projector.send_command(,[object Object],, retries=,[object Object],)
,[object Object], result == ,[object Object],
,[object Object], mock_serial.write.call_count == ,[object Object],
,[object Object],
,[object Object], ,[object Object],:
,[object Object],
,[object Object],
,[object Object],
,[object Object], ,[object Object],(,[object Object],):
,[object Object],
projector = GenericProjector(,[object Object],, ,[object Object],)
,[object Object], projector.connect():
,[object Object],:
status = projector.get_status()
,[object Object], status ,[object Object], ,[object Object], ,[object Object],
,[object Object], ,[object Object], ,[object Object], status
,[object Object],:
projector.disconnect()Documentation Standards
python
[object Object], ,[object Object],(,[object Object],) -> ,[object Object],[,[object Object],]:
,[object Object],This comprehensive guide provides the foundation for building professional-grade Python PySerial applications for AV control. The examples demonstrate industry best practices for reliability, maintainability, and cross-platform compatibility essential for mission-critical audiovisual installations.
End of documentation