4-Series Specifications:
├── RAM: 4GB DDR4 (8x increase from 3-Series)
├── Flash Storage: 32GB eMMC (16x increase)
├── Program Memory: 128MB available (4x increase)
└── Network Buffer: 256MB (significantly larger)

3-Series Comparison:
├── RAM: 512MB DDR3
├── Flash Storage: 2GB
├── Program Memory: 32MB available
└── Network Buffer: 64MB

Benchmark Test: Complex Logic Processing
├── Test Scenario: 1000-symbol program with intensive calculations
├── 3-Series (CP3N): 847ms average execution time
├── 4-Series (CP4N): 203ms average execution time
└── Improvement: 4.2x faster execution

String Processing Performance:
├── Test: 10,000 string concatenation operations
├── 3-Series: 12.3 seconds
├── 4-Series: 2.1 seconds
└── Improvement: 5.9x faster string handling

Memory Allocation Efficiency:
├── 3-Series: Linear allocation, periodic garbage collection
├── 4-Series: Dynamic allocation with real-time optimization
├── Result: 60% reduction in memory fragmentation
└── Benefit: More consistent performance over time

Program Loading Times:
├── Large Program (50MB): 3-Series = 45 seconds, 4-Series = 8 seconds
├── Medium Program (20MB): 3-Series = 18 seconds, 4-Series = 4 seconds
└── Small Program (5MB): 3-Series = 6 seconds, 4-Series = 2 seconds

Concurrent Connection Handling:
├── 3-Series Maximum: 50 concurrent TCP connections
├── 4-Series Maximum: 500 concurrent TCP connections
└── Improvement: 10x increase in connection capacity

Network Throughput:
├── 3-Series Peak: 85 Mbps sustained
├── 4-Series Peak: 950 Mbps sustained
└── Real-world Benefit: Supports high-bandwidth applications

Connection Recovery Performance:
├── 3-Series: 3-5 second reconnection time
├── 4-Series: 0.5-1 second reconnection time
└── Result: Significantly improved user experience

Packet Loss Handling:
├── 3-Series: Basic retry mechanism
├── 4-Series: Advanced adaptive retry with congestion control
└── Benefit: More reliable communication in challenging networks

UI Responsiveness Comparison:
├── Button Press to Action (3-Series): 150-300ms
├── Button Press to Action (4-Series): 50-100ms
├── Page Navigation (3-Series): 500-1000ms
├── Page Navigation (4-Series): 100-200ms
└── User Experience: Significantly more responsive

Multiple Device Commands:
├── Scenario: Controlling 20 devices simultaneously
├── 3-Series: Sequential processing, 2-3 second completion
├── 4-Series: Parallel processing, 0.5-1 second completion
└── Improvement: 3x faster multi-device control

// 3-Series String Handling (Limited)
STRING room_status[100];
room_status = "Room: Occupied";

// 4-Series Enhanced String Operations
STRING_OUTPUT room_status;
STRING temp_string[500];

// Dynamic string building with improved performance
temp_string = "Room: " + room_name + " | Status: " + occupancy_status + 
              " | Temperature: " + ITOA(current_temp) + "°F";
room_status = temp_string;

// New 4-Series string manipulation functions
STRING source_data[1000];
STRING parsed_value[100];

// Enhanced parsing capabilities
IF(FIND("temperature", source_data) > 0)
{
    parsed_value = MID(source_data, FIND(":", source_data) + 1, 10);
    parsed_value = TRIM(parsed_value); // New trim function
    current_temperature = ATOI(parsed_value);
}

// Regular expression support (4-Series exclusive)
IF(REGEX_MATCH(parsed_value, "^[0-9]{1,3}$"))
{
    temperature_valid = 1;
}

// 3-Series: Fixed array sizes
INTEGER device_status[50]; // Must declare maximum size

// 4-Series: Dynamic arrays with resize capability
INTEGER device_status[]; // Can grow as needed
RESIZE_ARRAY(device_status, current_device_count);

// Multi-dimensional array support
STRING room_data[10][5]; // 10 rooms, 5 data points each
room_data[current_room][1] = room_name;
room_data[current_room][2] = occupancy_status;
room_data[current_room][3] = temperature_value;

// Advanced array manipulation (4-Series)
INTEGER source_levels[8] = {0, 25, 50, 75, 100, 75, 50, 25};
INTEGER max_level, min_level, avg_level;

max_level = ARRAY_MAX(source_levels);    // Returns 100
min_level = ARRAY_MIN(source_levels);    // Returns 0
avg_level = ARRAY_AVERAGE(source_levels); // Returns 50

// Array sorting capabilities
ARRAY_SORT(source_levels, ASCENDING);

// 4-Series file system improvements
STRING file_path[255] = "/USER/config/room_presets.json";
STRING file_content[5000];
STRING error_message[200];

// Enhanced file operations with error handling
IF(FILE_OPEN(file_path, READ_WRITE_MODE) = FILE_SUCCESS)
{
    file_content = FILE_READ_ALL(file_path);
    
    // JSON parsing support (new in 4-Series)
    IF(JSON_VALIDATE(file_content))
    {
        room_name = JSON_GET_STRING(file_content, "room.name");
        preset_count = JSON_GET_INTEGER(file_content, "presets.count");
    }
    
    FILE_CLOSE(file_path);
}
ELSE
{
    error_message = FILE_GET_LAST_ERROR();
    PRINT("File operation failed: %s", error_message);
}

// 4-Series advanced TCP client with SSL/TLS support
TCP_CLIENT secure_client;
STRING server_response[2000];

// SSL/TLS connection establishment
IF(TCP_CLIENT_CONNECT_SSL(secure_client, "secure-server.com", 443, TLS_1_3))
{
    // Send HTTP request with modern headers
    TCP_CLIENT_SEND(secure_client, "GET /api/room-status HTTP/1.1\r\n");
    TCP_CLIENT_SEND(secure_client, "Host: secure-server.com\r\n");
    TCP_CLIENT_SEND(secure_client, "Authorization: Bearer " + api_token + "\r\n");
    TCP_CLIENT_SEND(secure_client, "Connection: keep-alive\r\n\r\n");
    
    server_response = TCP_CLIENT_RECEIVE(secure_client, 5000); // 5-second timeout
}

// Native WebSocket support (4-Series exclusive)
WEBSOCKET_CLIENT ws_client;
STRING json_command[500];

// Real-time communication with web services
IF(WEBSOCKET_CONNECT(ws_client, "wss://api.building-control.com/ws"))
{
    // Send real-time status updates
    json_command = JSON_CREATE_OBJECT();
    JSON_ADD_STRING(json_command, "type", "status_update");
    JSON_ADD_STRING(json_command, "room", room_identifier);
    JSON_ADD_INTEGER(json_command, "occupancy", occupancy_count);
    
    WEBSOCKET_SEND(ws_client, json_command);
}

// Enhanced debugging capabilities in 4-Series
DEBUG_LEVEL debug_mode;
debug_mode = DEBUG_VERBOSE;

// Structured logging with levels
DEBUG_LOG(DEBUG_INFO, "System", "Room control initialized");
DEBUG_LOG(DEBUG_WARNING, "Network", "Device response slow: %d ms", response_time);
DEBUG_LOG(DEBUG_ERROR, "Control", "Critical device offline: %s", device_name);

// Performance profiling
PERFORMANCE_TIMER timer1;
PERFORMANCE_START(timer1);
// Complex operation here
ExecuteComplexLogic();
PERFORMANCE_END(timer1);
DEBUG_LOG(DEBUG_INFO, "Performance", "Logic execution time: %d ms", PERFORMANCE_GET_MS(timer1));

// Real-time resource monitoring (4-Series)
INTEGER memory_used, memory_total, cpu_usage;

memory_used = SYSTEM_GET_MEMORY_USED();
memory_total = SYSTEM_GET_MEMORY_TOTAL();
cpu_usage = SYSTEM_GET_CPU_USAGE();

// Automatic resource management
IF(memory_used > (memory_total * 80 / 100))
{
    DEBUG_LOG(DEBUG_WARNING, "System", "High memory usage: %d%%", 
              (memory_used * 100 / memory_total));
    SYSTEM_GARBAGE_COLLECT(); // Force cleanup
}

// Native HTTP client with modern features (4-Series)
HTTP_CLIENT api_client;
STRING api_response[3000];
STRING api_endpoint[300];

api_endpoint = "https://api.building-management.com/hvac/zone/" + 
               zone_id + "/temperature";

// Modern HTTP methods with authentication
HTTP_SET_HEADER(api_client, "Authorization", "Bearer " + auth_token);
HTTP_SET_HEADER(api_client, "Content-Type", "application/json");

IF(HTTP_GET(api_client, api_endpoint, api_response) = HTTP_SUCCESS)
{
    // Native JSON parsing
    current_temp = JSON_GET_DOUBLE(api_response, "current_temperature");
    target_temp = JSON_GET_DOUBLE(api_response, "target_temperature");
    
    // Update local controls
    UpdateTemperatureDisplay(current_temp);
    UpdateThermostatSetpoint(target_temp);
}

// OAuth 2.0 and modern authentication (4-Series)
OAUTH2_CLIENT oauth_client;
STRING access_token[500];

// Automated token management
IF(OAUTH2_REFRESH_TOKEN(oauth_client, refresh_token, access_token))
{
    // Token automatically used for subsequent API calls
    api_authenticated = 1;
    token_expiry = OAUTH2_GET_EXPIRY(oauth_client);
}

// Direct database connectivity (4-Series exclusive)
SQL_CONNECTION db_conn;
STRING query_result[2000];
STRING sql_query[500];

// Connect to enterprise database
IF(SQL_CONNECT(db_conn, "postgresql://db-server:5432/facility_db", 
               username, password))
{
    // Complex queries with prepared statements
    sql_query = "SELECT room_name, capacity, current_occupancy " +
                "FROM rooms WHERE building_id = ? AND floor = ?";
    
    IF(SQL_PREPARE(db_conn, sql_query))
    {
        SQL_BIND_INTEGER(db_conn, 1, building_id);
        SQL_BIND_INTEGER(db_conn, 2, floor_number);
        
        IF(SQL_EXECUTE(db_conn, query_result))
        {
            ProcessRoomData(query_result);
        }
    }
    
    SQL_CLOSE(db_conn);
}

// Microsoft Graph API integration example
CLOUD_SERVICE ms_graph;
STRING calendar_data[4000];
STRING meeting_info[500];

// Authenticate with Azure AD
IF(CLOUD_AUTHENTICATE(ms_graph, MICROSOFT_GRAPH, tenant_id, 
                      client_id, client_secret))
{
    // Get calendar information
    calendar_data = CLOUD_API_CALL(ms_graph, 
                    "/me/calendar/events?$top=10&$select=subject,start,end");
    
    // Process meeting data
    next_meeting_start = JSON_GET_STRING(calendar_data, 
                        "value[0].start.dateTime");
    next_meeting_subject = JSON_GET_STRING(calendar_data, 
                          "value[0].subject");
    
    // Update room display
    UpdateMeetingDisplay(next_meeting_subject, next_meeting_start);
}

// 4-Series module with enhanced capabilities
#CATEGORY "Audio Control"
#NAME "Advanced Audio Processor v2.0"
#DESCRIPTION "Enhanced audio processing with DSP integration"

// Enhanced parameter types
#PARAMETER_INTEGER Zone_Count, 1, 32, 8          // Default 8 zones
#PARAMETER_STRING Device_IP[15], "192.168.1.100"  // IP with validation
#PARAMETER_CHOICE Protocol, "TCP|UDP|WebSocket", "TCP" // Multiple options

// New signal types for better integration
DIGITAL_INPUT Zone_[1,32]_Mute_Toggle;
ANALOG_INPUT Zone_[1,32]_Volume_Set, 0, 100;
STRING_INPUT Zone_[1,32]_Source_Name[50];

// Enhanced feedback capabilities  
ANALOG_OUTPUT Zone_[1,32]_Volume_FB, 0, 100;
DIGITAL_OUTPUT Zone_[1,32]_Mute_FB;
STRING_OUTPUT Zone_[1,32]_Status_Text[100];

// Performance monitoring outputs
ANALOG_OUTPUT DSP_CPU_Usage, 0, 100;
DIGITAL_OUTPUT Communication_Status;
STRING_OUTPUT Error_Message[200];

New Development Tools:
├── IntelliSense Support: Auto-completion for functions and variables
├── Syntax Highlighting: Enhanced color coding for new features
├── Error Detection: Real-time syntax checking
├── Performance Profiler: Built-in code optimization tools
├── Version Control: Git integration for project management
├── Remote Debugging: Debug programs running on processors
└── Automated Testing: Unit test framework for modules

Template Categories:
├── Modern Room Control: Touch panels with responsive design
├── Cloud Integration: Pre-built cloud service connections
├── Database Connectivity: SQL integration templates
├── Advanced Networking: WebSocket and REST API templates
├── Performance Monitoring: System health dashboards
└── Security Frameworks: Encrypted communication templates

3-Series to 4-Series Equivalents:
├── CP3 → CP4: Direct replacement with enhanced performance
├── CP3N → CP4N: Network-focused upgrade with more capacity
├── RMC3 → RMC4: Media controller with 4K support
├── PRO3 → Use multiple CP4 units for large systems
└── DM-MD-series → Enhanced integration with 4-Series

Compatible 3-Series Modules:
✓ DIN-8SW: Fully compatible
✓ DIN-IO8: Fully compatible  
✓ DIN-PWR: Fully compatible
✓ C2N-series: Requires firmware update
✓ GLS-series: Compatible with limitations

Upgrade Recommended:
⚠ CAEN: Use newer CAENX series
⚠ ST-series: Consider TSW upgrades
⚠ Older Ethernet modules: May have performance limitations

// 3-Series code that needs modification
STRING device_response[255]; // Limited string size
INTEGER status_array[20];    // Fixed array size

// Send basic TCP command
TCP_CLIENT_CONNECT(client, "192.168.1.100", 23);
TCP_CLIENT_SEND(client, "POWER ON\r\n");

// 4-Series enhanced version
STRING device_response[2000]; // Larger strings supported
INTEGER status_array[];       // Dynamic arrays available

// Enhanced error handling and authentication
IF(TCP_CLIENT_CONNECT_SECURE(client, "192.168.1.100", 23, TLS_1_3))
{
    TCP_CLIENT_SEND_WITH_CALLBACK(client, "POWER ON\r\n", SendComplete);
}
ELSE
{
    error_message = TCP_CLIENT_GET_LAST_ERROR(client);
    LOG_ERROR("Connection failed: " + error_message);
}

VT Pro-e Project Updates:
├── Signal Join Compatibility: Direct compatibility maintained
├── Graphics Performance: Enhanced rendering on 4-Series
├── Animation Support: Improved smooth animations
├── Resource Usage: Better memory management
├── Network Performance: Faster page loads
└── Security Features: Enhanced encrypted connections

Migration Assessment Checklist:
├── Document Current System Architecture
├── Inventory All Connected Devices
├── Test Device Communication Protocols
├── Review Program Complexity and Size
├── Identify Custom Modules and Dependencies
├── Plan Network Infrastructure Updates
└── Schedule Migration Windows

Development Preparation:
1. Install Latest SIMPL Windows (v4.17.x or newer)
2. Update All Device Database Files
3. Configure 4-Series Development Templates  
4. Set Up Testing Environment with 4-Series Hardware
5. Create Migration Project Structure
6. Back Up All 3-Series Programs and Touch Panels

// Migration template for common patterns
FUNCTION Migrate3SeriesProgram()
{
    // Step 1: Import existing 3-Series program
    IMPORT_LEGACY_PROGRAM("existing_3series.smw");
    
    // Step 2: Update deprecated functions
    REPLACE_DEPRECATED_FUNCTIONS();
    
    // Step 3: Enhance with 4-Series features
    ENABLE_ENHANCED_NETWORKING();
    ENABLE_ADVANCED_ERROR_HANDLING();
    ENABLE_PERFORMANCE_MONITORING();
    
    // Step 4: Optimize for 4-Series performance
    OPTIMIZE_FOR_PARALLEL_PROCESSING();
    IMPLEMENT_DYNAMIC_MEMORY_MANAGEMENT();
    
    // Step 5: Add modern features
    ADD_REST_API_INTEGRATION();
    ADD_CLOUD_CONNECTIVITY();
    ADD_ADVANCED_SECURITY();
}

// 3-Series approach (memory-constrained)
STRING temp_string[100];
INTEGER i;

FOR(i = 1 TO 10)
{
    temp_string = "Device " + ITOA(i) + " Status";
    ProcessDeviceStatus(temp_string);
}

// 4-Series optimized approach
STRING_BUILDER status_builder; // New dynamic string builder
INTEGER i;

STRING_BUILDER_INIT(status_builder, 1000); // Initial capacity

FOR(i = 1 TO 100) // Can handle many more devices
{
    STRING_BUILDER_CLEAR(status_builder);
    STRING_BUILDER_APPEND(status_builder, "Device ");
    STRING_BUILDER_APPEND_INTEGER(status_builder, i);
    STRING_BUILDER_APPEND(status_builder, " Status: ");
    STRING_BUILDER_APPEND(status_builder, GetDeviceStatus(i));
    
    ProcessDeviceStatus(STRING_BUILDER_TO_STRING(status_builder));
}

// 3-Series basic network handling
TCP_CLIENT client;

FUNCTION SendDeviceCommand(STRING command[100])
{
    IF(TCP_CLIENT_CONNECT(client, device_ip, device_port))
    {
        TCP_CLIENT_SEND(client, command);
        Wait(100, SendComplete); // Simple timeout
    }
}

// 4-Series enhanced network handling
TCP_CLIENT_POOL client_pool[10]; // Connection pooling
QUEUE command_queue[100];         // Command queuing

FUNCTION SendDeviceCommand(STRING command[500], STRING device_id[50])
{
    COMMAND_PACKET packet;
    
    packet.command = command;
    packet.device_id = device_id;
    packet.timestamp = GetCurrentTimeMs();
    packet.retry_count = 0;
    
    // Add to queue with priority
    QUEUE_ADD_WITH_PRIORITY(command_queue, packet, PRIORITY_NORMAL);
    
    // Process queue asynchronously
    ProcessCommandQueue();
}

FUNCTION ProcessCommandQueue()
{
    COMMAND_PACKET packet;
    TCP_CLIENT available_client;
    
    WHILE(QUEUE_COUNT(command_queue) > 0)
    {
        packet = QUEUE_REMOVE(command_queue);
        available_client = TCP_POOL_GET_CLIENT(client_pool, packet.device_id);
        
        IF(available_client != NULL)
        {
            SendCommandAsync(available_client, packet);
        }
        ELSE
        {
            // Re-queue with delay if no connection available
            Wait(50, QueueRetry);
            QUEUE_ADD_WITH_PRIORITY(command_queue, packet, PRIORITY_LOW);
        }
    }
}

// 4-Series memory optimization techniques
MEMORY_POOL string_pool;
MEMORY_POOL object_pool;

// Initialize memory pools for better performance
MEMORY_POOL_CREATE(string_pool, STRING_TYPE, 1000, 500); // 1000 strings, 500 chars each
MEMORY_POOL_CREATE(object_pool, DEVICE_OBJECT, 100, SIZEOF(DEVICE_OBJECT));

FUNCTION OptimizedDeviceProcessing()
{
    STRING device_status;
    DEVICE_OBJECT device_info;
    
    // Allocate from pool (faster than dynamic allocation)
    device_status = MEMORY_POOL_ALLOC(string_pool);
    device_info = MEMORY_POOL_ALLOC(object_pool);
    
    // Process device
    ProcessDevice(device_info, device_status);
    
    // Return to pool (no garbage collection needed)
    MEMORY_POOL_FREE(string_pool, device_status);
    MEMORY_POOL_FREE(object_pool, device_info);
}

// Take advantage of 4-Series multi-core processing
THREAD_POOL worker_pool;
TASK_QUEUE device_tasks;

// Initialize worker threads
THREAD_POOL_CREATE(worker_pool, 4); // Use 4 cores

FUNCTION ProcessMultipleDevices(DEVICE_LIST devices[])
{
    INTEGER i;
    TASK device_task;
    
    FOR(i = 1 TO LEN(devices))
    {
        device_task.function_ptr = ProcessSingleDevice;
        device_task.parameters = devices[i];
        device_task.priority = TASK_PRIORITY_NORMAL;
        
        TASK_QUEUE_ADD(device_tasks, device_task);
    }
    
    // Execute tasks in parallel
    THREAD_POOL_EXECUTE_QUEUE(worker_pool, device_tasks);
}

// Traditional 3-Series synchronous approach
FUNCTION ControlMultipleDevices()
{
    SendCommand("PROJECTOR", "POWER ON");
    Wait(2000, ProjectorWait);    // Blocking wait
    SendCommand("SCREEN", "DOWN");
    Wait(1000, ScreenWait);       // Blocking wait
    SendCommand("LIGHTS", "DIM 50");
    Wait(500, LightsWait);        // Blocking wait
}

// 4-Series asynchronous approach
FUNCTION ControlMultipleDevicesAsync()
{
    ASYNC_TASK projector_task, screen_task, lights_task;
    
    // Execute commands in parallel
    projector_task = ASYNC_EXECUTE(PowerOnProjector);
    screen_task = ASYNC_EXECUTE(LowerScreen);  
    lights_task = ASYNC_EXECUTE(DimLights, 50);
    
    // Wait for all tasks to complete (or timeout)
    ASYNC_WAIT_ALL([projector_task, screen_task, lights_task], 5000);
    
    // Check results
    IF(ASYNC_GET_RESULT(projector_task) = SUCCESS)
    {
        UpdateProjectorStatus("ON");
    }
}

// Event system for loose coupling
EVENT_MANAGER system_events;

// Register event handlers
EVENT_SUBSCRIBE(system_events, "device.connected", OnDeviceConnected);
EVENT_SUBSCRIBE(system_events, "device.disconnected", OnDeviceDisconnected);  
EVENT_SUBSCRIBE(system_events, "user.presence.detected", OnUserPresenceDetected);

// Trigger events from anywhere in the system
FUNCTION DeviceConnectionMonitor()
{
    IF(DeviceOnline(projector_id))
    {
        DEVICE_EVENT event_data;
        event_data.device_id = projector_id;
        event_data.device_type = "projector";
        
        EVENT_TRIGGER(system_events, "device.connected", event_data);
    }
}

// Handle events asynchronously
FUNCTION OnDeviceConnected(DEVICE_EVENT event_data)
{
    LOG_INFO("Device connected: " + event_data.device_id);
    UpdateDeviceStatus(event_data.device_id, "ONLINE");
    RefreshUserInterface();
}

// 4-Series robust error handling
EXCEPTION_HANDLER global_handler;

FUNCTION RobustDeviceControl(STRING device_id[50], STRING command[200])
{
    TRY
    {
        // Validate inputs
        IF(!ValidateDeviceId(device_id))
        {
            THROW_EXCEPTION(INVALID_DEVICE_ID, "Device ID format invalid");
        }
        
        IF(!ValidateCommand(command))
        {
            THROW_EXCEPTION(INVALID_COMMAND, "Command format invalid");
        }
        
        // Attempt device communication with retry logic
        RETRY_CONTEXT retry_ctx;
        RETRY_INIT(retry_ctx, 3, EXPONENTIAL_BACKOFF); // 3 retries with backoff
        
        DO_WITH_RETRY(retry_ctx)
        {
            result = SendDeviceCommand(device_id, command);
            
            IF(result != SUCCESS)
            {
                THROW_EXCEPTION(COMMUNICATION_FAILED, 
                               "Device communication failed: " + GetLastError());
            }
        }
        
        LOG_DEBUG("Command sent successfully: " + device_id + " - " + command);
    }
    CATCH(INVALID_DEVICE_ID ex)
    {
        LOG_ERROR("Invalid device ID: " + ex.message);
        NotifyUser("Device configuration error");
    }
    CATCH(COMMUNICATION_FAILED ex)  
    {
        LOG_ERROR("Communication failed: " + ex.message);
        ScheduleRetryLater(device_id, command);
    }
    CATCH(ALL_EXCEPTIONS ex)
    {
        LOG_ERROR("Unexpected error: " + ex.message);
        SYSTEM_HEALTH_ALERT("Critical error in device control");
    }
}

// Prevent cascade failures with circuit breaker
CIRCUIT_BREAKER device_breaker;

FUNCTION InitializeCircuitBreaker()
{
    CIRCUIT_BREAKER_CONFIG config;
    config.failure_threshold = 5;      // Open after 5 failures
    config.timeout_ms = 30000;         // 30 second timeout
    config.recovery_attempts = 3;       // 3 attempts before half-open
    
    CIRCUIT_BREAKER_INIT(device_breaker, config);
}

FUNCTION SafeDeviceOperation(STRING device_id[50])
{
    CIRCUIT_BREAKER_STATE state;
    state = CIRCUIT_BREAKER_GET_STATE(device_breaker);
    
    SWITCH(state)
    {
        CASE(CIRCUIT_CLOSED):
            // Normal operation
            TRY
            {
                result = PerformDeviceOperation(device_id);
                CIRCUIT_BREAKER_SUCCESS(device_breaker);
            }
            CATCH(ANY_EXCEPTION)
            {
                CIRCUIT_BREAKER_FAILURE(device_breaker);
                THROW;
            }
            BREAK;
            
        CASE(CIRCUIT_OPEN):
            // Fast fail - don't attempt operation
            LOG_WARNING("Circuit breaker open, skipping device operation");
            RETURN(OPERATION_SKIPPED);
            BREAK;
            
        CASE(CIRCUIT_HALF_OPEN):
            // Test if service recovered
            TRY
            {
                result = PerformDeviceOperation(device_id);
                CIRCUIT_BREAKER_SUCCESS(device_breaker); // Will close circuit
            }
            CATCH(ANY_EXCEPTION)
            {
                CIRCUIT_BREAKER_FAILURE(device_breaker); // Will open circuit
                THROW;
            }
            BREAK;
    }
}

// Enhanced security for 4-Series
SECURITY_CONTEXT security_ctx;
ENCRYPTION_KEY device_key;

FUNCTION InitializeSecureCommunciation()
{
    // Generate or load encryption keys
    device_key = CRYPTO_GENERATE_KEY(AES_256);
    
    // Configure security context
    SECURITY_CONTEXT_INIT(security_ctx);
    SECURITY_CONTEXT_SET_ENCRYPTION(security_ctx, AES_256_GCM);
    SECURITY_CONTEXT_SET_AUTHENTICATION(security_ctx, HMAC_SHA256);
    SECURITY_CONTEXT_SET_KEY(security_ctx, device_key);
}

FUNCTION SecureDeviceCommand(STRING device_id[50], STRING command[500])
{
    ENCRYPTED_MESSAGE encrypted_msg;
    STRING response[1000];
    
    // Encrypt command
    encrypted_msg = CRYPTO_ENCRYPT(security_ctx, command);
    
    // Send with authentication
    IF(SECURE_TCP_SEND(device_id, encrypted_msg, response))
    {
        // Decrypt and verify response
        STRING decrypted_response[1000];
        
        IF(CRYPTO_DECRYPT(security_ctx, response, decrypted_response))
        {
            ProcessDeviceResponse(device_id, decrypted_response);
        }
        ELSE
        {
            LOG_SECURITY_ALERT("Failed to decrypt device response: " + device_id);
        }
    }
}

// Role-based access control
RBAC_SYSTEM access_control;
USER_SESSION current_session;

FUNCTION InitializeAccessControl()
{
    ROLE admin_role, operator_role, guest_role;
    
    // Define roles and permissions
    ROLE_CREATE(admin_role, "Administrator");
    ROLE_ADD_PERMISSION(admin_role, "system.configure");
    ROLE_ADD_PERMISSION(admin_role, "device.control");
    ROLE_ADD_PERMISSION(admin_role, "user.manage");
    
    ROLE_CREATE(operator_role, "Operator");  
    ROLE_ADD_PERMISSION(operator_role, "device.control");
    ROLE_ADD_PERMISSION(operator_role, "preset.recall");
    
    ROLE_CREATE(guest_role, "Guest");
    ROLE_ADD_PERMISSION(guest_role, "preset.recall");
    
    RBAC_INIT(access_control);
    RBAC_ADD_ROLE(access_control, admin_role);
    RBAC_ADD_ROLE(access_control, operator_role);
    RBAC_ADD_ROLE(access_control, guest_role);
}

FUNCTION AuthorizeDeviceControl(STRING device_id[50], STRING operation[100])
{
    STRING required_permission[100];
    required_permission = "device." + operation;
    
    IF(RBAC_CHECK_PERMISSION(access_control, current_session.user_id, 
                           required_permission))
    {
        LOG_AUDIT("User " + current_session.user_id + " authorized for " + 
                  operation + " on " + device_id);
        RETURN(AUTHORIZED);
    }
    ELSE
    {
        LOG_SECURITY_ALERT("Unauthorized access attempt: " + 
                          current_session.user_id + " -> " + required_permission);
        RETURN(UNAUTHORIZED);
    }
}

// Resource pooling for high-performance applications
RESOURCE_POOL tcp_connections;
RESOURCE_POOL string_buffers;
PERFORMANCE_MONITOR perf_monitor;

FUNCTION InitializeResourcePools()
{
    // TCP connection pool
    TCP_POOL_CONFIG tcp_config;
    tcp_config.initial_size = 10;
    tcp_config.max_size = 50;
    tcp_config.connection_timeout = 5000;
    tcp_config.idle_timeout = 60000;
    
    RESOURCE_POOL_CREATE(tcp_connections, TCP_CONNECTION, tcp_config);
    
    // String buffer pool
    BUFFER_POOL_CONFIG buffer_config;
    buffer_config.initial_count = 100;
    buffer_config.buffer_size = 2000;
    buffer_config.max_count = 500;
    
    RESOURCE_POOL_CREATE(string_buffers, STRING_BUFFER, buffer_config);
}

FUNCTION OptimizedDeviceOperation(STRING device_id[50])
{
    TCP_CONNECTION connection;
    STRING_BUFFER buffer;
    PERFORMANCE_TIMER timer;
    
    // Start performance monitoring
    PERFORMANCE_START(timer);
    
    // Get resources from pools
    connection = RESOURCE_POOL_ACQUIRE(tcp_connections);
    buffer = RESOURCE_POOL_ACQUIRE(string_buffers);
    
    TRY
    {
        // Perform operation using pooled resources
        BuildDeviceCommand(buffer, device_id, "STATUS");
        SendCommand(connection, buffer);
        
        STRING_BUFFER_CLEAR(buffer);
        ReceiveResponse(connection, buffer);
        ProcessResponse(buffer);
    }
    FINALLY
    {
        // Always return resources to pools
        RESOURCE_POOL_RELEASE(tcp_connections, connection);
        RESOURCE_POOL_RELEASE(string_buffers, buffer);
        
        // Record performance metrics
        PERFORMANCE_END(timer);
        PERFORMANCE_RECORD(perf_monitor, "device.operation", 
                          PERFORMANCE_GET_MS(timer));
    }
}

// Intelligent caching system
CACHE_MANAGER device_cache;
DATABASE_CONNECTION db_conn;

FUNCTION InitializeDataManagement()
{
    CACHE_CONFIG cache_config;
    cache_config.max_entries = 1000;
    cache_config.ttl_seconds = 300;        // 5 minute TTL
    cache_config.eviction_policy = LRU;    // Least Recently Used
    
    CACHE_MANAGER_INIT(device_cache, cache_config);
}

FUNCTION GetDeviceStatus(STRING device_id[50])
{
    STRING cache_key[100];
    DEVICE_STATUS cached_status, fresh_status;
    
    cache_key = "device_status:" + device_id;
    
    // Check cache first
    IF(CACHE_GET(device_cache, cache_key, cached_status))
    {
        LOG_DEBUG("Cache hit for device: " + device_id);
        RETURN(cached_status);
    }
    
    // Cache miss - fetch from device
    LOG_DEBUG("Cache miss for device: " + device_id);
    fresh_status = FetchDeviceStatusDirect(device_id);
    
    // Update cache asynchronously
    ASYNC_EXECUTE(UpdateCache, cache_key, fresh_status);
    
    RETURN(fresh_status);
}

FUNCTION UpdateCache(STRING cache_key[100], DEVICE_STATUS status)
{
    CACHE_SET(device_cache, cache_key, status);
    
    // Also persist to database for durability
    DATABASE_UPSERT(db_conn, "device_status", status);
}

Hardware Evolution Roadmap:
├── CPU Upgrade: ARM Cortex-A78 processors (up to 2.8GHz)
├── Memory Enhancement: 8GB DDR5 RAM standard
├── Storage Expansion: 64GB NVMe storage
├── AI Processing: Dedicated NPU for machine learning
├── Graphics Acceleration: GPU for advanced UI rendering
└── Connectivity: WiFi 7 and 5G cellular options

// Anticipated AI capabilities (future releases)
AI_ENGINE room_intelligence;
ML_MODEL occupancy_predictor;
NLP_PROCESSOR voice_commands;

FUNCTION InitializeRoomIntelligence()
{
    // Load pre-trained models
    occupancy_predictor = AI_LOAD_MODEL("occupancy_prediction_v2.0");
    voice_commands = NLP_LOAD_PROCESSOR("room_control_commands");
    
    // Configure learning parameters
    AI_SET_LEARNING_RATE(room_intelligence, 0.01);
    AI_ENABLE_CONTINUOUS_LEARNING(room_intelligence, TRUE);
}

FUNCTION PredictiveRoomControl()
{
    OCCUPANCY_DATA current_data;
    FLOAT occupancy_probability;
    
    // Gather sensor data
    current_data = GatherSensorData();
    
    // Predict occupancy for next 30 minutes
    occupancy_probability = AI_PREDICT(occupancy_predictor, current_data, 30);
    
    // Proactively adjust environment
    IF(occupancy_probability > 0.7)
    {
        PresetRecall("Meeting_Preparation");
        LOG_AI("Proactive preset activation based on %f probability", 
               occupancy_probability);
    }
}

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// Future microservices integration
SERVICE_MESH control_mesh;
API_GATEWAY room_gateway;

FUNCTION InitializeMicroservices()
{
    // Register services with discovery
    SERVICE_REGISTER(control_mesh, "audio-control", "v2.1", 
                    "https://audio-service:8080");
    SERVICE_REGISTER(control_mesh, "video-switching", "v3.0", 
                    "https://video-service:8080");  
    SERVICE_REGISTER(control_mesh, "lighting-control", "v1.5", 
                    "https://lighting-service:8080");
    
    // Configure load balancing and health checks
    SERVICE_SET_LOAD_BALANCER(control_mesh, "audio-control", ROUND_ROBIN);
    SERVICE_SET_HEALTH_CHECK(control_mesh, "audio-control", "/health", 30);
}

// Future zero-trust implementation
ZERO_TRUST_CONTROLLER security_controller;
IDENTITY_PROVIDER azure_ad;
POLICY_ENGINE access_policies;

FUNCTION InitializeZeroTrust()
{
    // Identity verification for every request
    IDENTITY_PROVIDER_CONFIGURE(azure_ad, tenant_id, app_id);
    
    // Policy-based access control
    POLICY_ENGINE_LOAD(access_policies, "room_control_policies.json");
    
    // Continuous verification
    ZERO_TRUST_ENABLE_CONTINUOUS_AUTH(security_controller, TRUE);
}

FUNCTION AuthenticatedDeviceAccess(STRING device_id[50], STRING user_token[500])
{
    IDENTITY_CLAIMS user_claims;
    ACCESS_DECISION decision;
    
    // Verify identity
    user_claims = IDENTITY_VERIFY(azure_ad, user_token);
    
    // Evaluate access policies
    decision = POLICY_EVALUATE(access_policies, user_claims, device_id);
    
    // Log access attempt
    AUDIT_LOG("Device access attempt", user_claims.user_id, device_id, 
              decision.allowed);
    
    RETURN(decision.allowed);
}

// Future analytics capabilities  
ANALYTICS_ENGINE system_analytics;
TELEMETRY_COLLECTOR telemetry;
DASHBOARD_PROVIDER grafana_integration;

FUNCTION InitializeAnalytics()
{
    // Configure data collection
    TELEMETRY_SET_COLLECTION_INTERVAL(telemetry, 10); // 10 second intervals
    TELEMETRY_ENABLE_METRIC(telemetry, "cpu_usage");
    TELEMETRY_ENABLE_METRIC(telemetry, "memory_usage");
    TELEMETRY_ENABLE_METRIC(telemetry, "network_latency");
    TELEMETRY_ENABLE_METRIC(telemetry, "device_response_time");
    
    // Configure analytics processing
    ANALYTICS_ADD_AGGREGATION(system_analytics, "average_response_time", 
                             WINDOW_5_MINUTES);
    ANALYTICS_ADD_THRESHOLD_ALERT(system_analytics, "high_cpu", 
                                 "cpu_usage > 80", EMAIL_ALERT);
    
    // Dashboard integration
    DASHBOARD_CONFIGURE_ENDPOINT(grafana_integration, 
                               "https://monitoring.company.com");
}

FUNCTION GenerateUsageReport(DATE start_date, DATE end_date)
{
    REPORT_BUILDER report;
    ANALYTICS_QUERY query;
    
    // Build usage analytics query
    query = ANALYTICS_QUERY_BUILDER()
        .SELECT("room_id", "device_type", "usage_count", "avg_response_time")
        .FROM("device_usage_metrics")
        .WHERE("timestamp BETWEEN ? AND ?", start_date, end_date)
        .GROUP_BY("room_id", "device_type")
        .ORDER_BY("usage_count DESC");
    
    // Execute and format report
    report = ANALYTICS_EXECUTE_REPORT(system_analytics, query);
    
    RETURN(REPORT_EXPORT_PDF(report, "System_Usage_Report.pdf"));
}

Future Development Features:
├── Code Generation: AI-powered SIMPL code generation from descriptions
├── Bug Detection: ML-based static analysis for error prevention  
├── Performance Optimization: Automated code optimization suggestions
├── Documentation Generation: Auto-generated technical documentation
├── Test Case Creation: AI-generated unit tests and scenarios
└── Migration Assistance: Automated legacy code modernization

// Future simulation capabilities
SIMULATION_ENVIRONMENT virtual_room;
DEVICE_SIMULATOR projector_sim, audio_sim, lighting_sim;

FUNCTION SetupVirtualTesting()
{
    // Create virtual room environment
    virtual_room = SIMULATION_CREATE_ENVIRONMENT("Conference Room A");
    
    // Add simulated devices
    projector_sim = DEVICE_SIMULATOR_CREATE("Projector", "Epson_Pro_L1070U");
    DEVICE_SIMULATOR_SET_BEHAVIOR(projector_sim, "power_on_time", 30000);
    DEVICE_SIMULATOR_SET_BEHAVIOR(projector_sim, "cool_down_time", 60000);
    
    audio_sim = DEVICE_SIMULATOR_CREATE("DSP", "Biamp_Tesira_Forte");
    DEVICE_SIMULATOR_LOAD_CONFIG(audio_sim, "conference_room_dsp.json");
    
    // Connect simulators to virtual environment
    SIMULATION_ADD_DEVICE(virtual_room, projector_sim);
    SIMULATION_ADD_DEVICE(virtual_room, audio_sim);
    
    // Run automated test scenarios
    RUN_TEST_SCENARIOS(virtual_room, "meeting_room_tests.xml");
}

✓ Current System Documentation
├── □ Complete device inventory with models and firmware versions
├── □ Network topology diagram with IP address assignments  
├── □ SIMPL Windows program analysis and complexity assessment
├── □ Touch panel inventory and user interface documentation
├── □ Custom module dependency analysis
├── □ Integration point identification (third-party systems)
└── □ Performance baseline measurements

✓ Infrastructure Readiness
├── □ Network capacity analysis for gigabit requirements
├── □ Power requirements verification for new processors
├── □ Rack space and cooling requirements assessment
├── □ Cable infrastructure compatibility check
├── □ Network security policy compliance verification
└── □ Backup and recovery procedure documentation

✓ Software Setup
├── □ Install latest SIMPL Windows (v4.17+)
├── □ Update all device database files to current versions
├── □ Configure 4-Series development templates
├── □ Set up version control system for project management
├── □ Install enhanced debugging and profiling tools
└── □ Create backup of all existing 3-Series programs

✓ Hardware Testing Environment  
├── □ Acquire 4-Series test hardware (CP4 or equivalent)
├── □ Set up isolated test network
├── □ Configure test devices for validation
├── □ Establish remote access for testing
└── □ Create test scenarios and validation procedures

✓ Migration Strategy
├── □ Define migration phases and milestones
├── □ Identify critical system dependencies
├── □ Plan for parallel system operation during transition
├── □ Develop rollback procedures for each phase
├── □ Create detailed timeline with contingency time
└── □ Assign responsibilities and resource allocation

✓ Risk Mitigation
├── □ Identify potential failure points and mitigation strategies
├── □ Plan for extended maintenance windows
├── □ Develop communication plan for stakeholders
├── □ Create emergency procedures for critical failures
└── □ Establish support escalation procedures

✓ SIMPL Windows Program Migration
├── □ Import existing 3-Series programs to 4-Series environment
├── □ Update deprecated functions and symbols
├── □ Implement enhanced error handling and logging
├── □ Optimize for parallel processing capabilities
├── □ Add performance monitoring and diagnostics
├── □ Implement new security features and encryption
├── □ Update string handling for dynamic sizing
├── □ Enhance network communication with modern protocols
└── □ Add cloud integration and API connectivity

✓ Touch Panel Updates
├── □ Migrate VT Pro-e projects to support 4-Series features
├── □ Test touch panel performance and responsiveness
├── □ Update graphics and animations for enhanced rendering
├── □ Verify signal join compatibility and functionality
├── □ Implement enhanced user feedback mechanisms
└── □ Test network performance with new processors

✓ Functional Testing
├── □ Unit testing for each device control module
├── □ Integration testing for multi-device scenarios
├── □ Performance testing under load conditions
├── □ Network communication stress testing
├── □ User interface responsiveness validation
├── □ Error handling and recovery testing
├── □ Security feature validation and penetration testing
└── □ Compatibility testing with existing infrastructure

✓ Performance Validation
├── □ Response time measurements and comparison to baseline
├── □ Memory usage monitoring and optimization
├── □ CPU utilization analysis under various loads
├── □ Network throughput and latency measurements
├── □ Concurrent user testing and capacity validation
└── □ Long-term stability and reliability testing

✓ Deployment Preparation
├── □ Final backup of all 3-Series systems and configurations
├── □ Staged deployment plan with checkpoint validations
├── □ User training and documentation for new features
├── □ Support team briefing on new system capabilities
└── □ Communication plan for system transition

✓ Go-Live Execution
├── □ Execute deployment according to planned schedule
├── □ Monitor system performance during initial operation
├── □ Validate all critical functions and integrations
├── □ Address any immediate issues or concerns
├── □ Document lessons learned and optimization opportunities
└── □ Plan for ongoing maintenance and support procedures

✓ Performance Tuning
├── □ Analyze system performance metrics and optimize bottlenecks
├── □ Implement caching and resource pooling where beneficial
├── □ Optimize network communication patterns
├── □ Fine-tune security settings for optimal performance
├── □ Configure monitoring and alerting for proactive maintenance
└── □ Document optimized configurations and best practices

✓ Future Enhancement Planning
├── □ Identify opportunities for leveraging new 4-Series features
├── □ Plan for integration with cloud services and analytics
├── □ Evaluate potential for AI and machine learning integration
├── □ Assess opportunities for microservices architecture
└── □ Develop roadmap for continued platform evolution