Master Controller (NetLinx Processor)
├── Device Network (Device-Device-Device)
├── Touch Panels (Ethernet/WiFi)
├── IP Devices (Network Integration)
└── Serial/IR Devices (Traditional Control)

NetLinx Studio Workspace
├── Project Files (.apw)
├── Source Code (.axs)
├── Include Files (.axi)
├── Module Files (.axm)
├── Touch Panel Files (.tp5)
└── Device Configuration (.cfg)

// Standard workspace structure for AMX programming
PROGRAM_NAME='Conference_Room_System'
(***********************************************************)
(* System: Conference Room AV Control                      *)
(* Programmer: [Your Name]                                *)
(* Date: [Current Date]                                   *)
(* Revision: 1.0                                          *)
(***********************************************************)

// Device definitions
DEFINE_DEVICE
    dvMaster         = 0:1:0    // Master controller
    dvTouchPanel     = 10001:1:0 // Touch panel
    dvProjector      = 5001:1:0  // Projector control
    dvAudioProcessor = 5001:2:0  // Audio DSP
    dvLightingGateway = 5001:3:0 // Lighting control

// Variable definitions
DEFINE_VARIABLE
    INTEGER nSystemState = 0
    INTEGER nVolumeLevel = 50
    CHAR cProjectorStatus[50]

Project_Name/
├── Source/
│   ├── Main.axs                 // Main program file
│   ├── Devices/
│   │   ├── Projector_Control.axi
│   │   ├── Audio_Control.axi
│   │   └── Lighting_Control.axi
│   ├── UI/
│   │   ├── TouchPanel_Events.axi
│   │   └── Feedback_Handler.axi
│   └── Modules/
│       ├── Device_Module_1.axm
│       └── Device_Module_2.axm
├── TouchPanels/
│   ├── Main_Panel.tp5
│   └── Portable_Panel.tp5
└── Documentation/
    ├── System_Design.pdf
    └── Programming_Notes.txt

(***********************************************************)
(* AMX Programming Template - Device Control Module       *)
(***********************************************************)
PROGRAM_NAME='Device_Template'

DEFINE_DEVICE
    dvDevice    = 5001:1:0
    dvTP        = 10001:1:0

DEFINE_CONSTANT
    // Device specific constants
    DEVICE_POWER_ON     = 1
    DEVICE_POWER_OFF    = 0
    CMD_TIMEOUT         = 10

DEFINE_VARIABLE
    INTEGER nDevicePower = 0
    INTEGER nDeviceOnline = 0
    CHAR cLastCommand[255]

DEFINE_START
    // Initialization code
    CREATE_BUFFER dvDevice, cDeviceBuffer

DEFINE_EVENT
    DATA_EVENT[dvDevice]
    {
        ONLINE:
        {
            nDeviceOnline = 1
            SEND_COMMAND dvDevice, "'SET BAUD 9600,N,8,1'"
        }
        OFFLINE:
        {
            nDeviceOnline = 0
        }
        STRING:
        {
            ProcessDeviceResponse(DATA.TEXT)
        }
    }

DEFINE_FUNCTION ProcessDeviceResponse(CHAR cResponse[])
{
    // Response processing logic
    SELECT
    {
        ACTIVE (FIND_STRING(cResponse,'PWR=ON',1)):
        {
            nDevicePower = 1
            SendTouchPanelUpdate()
        }
        ACTIVE (FIND_STRING(cResponse,'PWR=OFF',1)):
        {
            nDevicePower = 0
            SendTouchPanelUpdate()
        }
    }
}

// Integer variables for numeric operations
DEFINE_VARIABLE
    INTEGER nVolumeLevel        // 16-bit signed integer
    SINTEGER snTemperature      // 16-bit signed integer
    LONG lFileSize             // 32-bit signed integer
    SLONG slTimestamp          // 32-bit signed long

// Character arrays for text handling
    CHAR cDeviceName[50]       // Fixed-length string
    CHAR cBuffer[1000]         // Communication buffer
    WIDECHAR wcUnicodeText[100] // Unicode string support

// Floating point for precise calculations
    FLOAT fAmplitudeRatio      // IEEE floating point
    DOUBLE dFrequencyResponse   // Double precision float

// Structure definitions for organized data
DEFINE_TYPE
    STRUCTURE strAudioChannel
    {
        INTEGER nLevel
        INTEGER nMute
        CHAR cName[25]
        FLOAT fEQGain[10]
    }

DEFINE_VARIABLE
    strAudioChannel AudioChannels[16]  // Array of structures

// Dynamic arrays and memory management
    CHAR cDynamicBuffer[0]    // Dynamic buffer
    DEV dvDeviceArray[0]      // Dynamic device array

// Advanced conditional structures
DEFINE_FUNCTION ProcessSystemInput(INTEGER nInput, INTEGER nValue)
{
    SELECT
    {
        ACTIVE (nInput == INPUT_POWER):
        {
            IF (nValue)
            {
                ExecutePowerOnSequence()
            }
            ELSE
            {
                ExecutePowerOffSequence()
            }
        }
        ACTIVE (nInput >= INPUT_SOURCE_1 && nInput <= INPUT_SOURCE_8):
        {
            INTEGER nSourceNum = nInput - INPUT_SOURCE_1 + 1
            SwitchToSource(nSourceNum)
        }
        ACTIVE (nInput == INPUT_VOLUME):
        {
            IF (nValue >= 0 && nValue <= 100)
            {
                SetSystemVolume(nValue)
            }
        }
    }
}

// Efficient loop patterns for AMX programming
DEFINE_FUNCTION InitializeAudioChannels()
{
    INTEGER nChannel
    FOR (nChannel = 1; nChannel <= MAX_AUDIO_CHANNELS; nChannel++)
    {
        AudioChannels[nChannel].nLevel = 50
        AudioChannels[nChannel].nMute = FALSE
        AudioChannels[nChannel].cName = "'Channel ',ITOA(nChannel)"
        
        // Initialize EQ settings
        INTEGER nBand
        FOR (nBand = 1; nBand <= 10; nBand++)
        {
            AudioChannels[nChannel].fEQGain[nBand] = 0.0
        }
    }
}

// While loop for continuous monitoring
DEFINE_FUNCTION MonitorSystemHealth()
{
    INTEGER nDeviceIndex = 1
    WHILE (nDeviceIndex <= LENGTH_ARRAY(dvDeviceList))
    {
        IF (IsDeviceOnline(dvDeviceList[nDeviceIndex]))
        {
            QueryDeviceStatus(dvDeviceList[nDeviceIndex])
        }
        ELSE
        {
            LogDeviceOffline(dvDeviceList[nDeviceIndex])
        }
        nDeviceIndex++
    }
}

// Advanced string processing functions
DEFINE_FUNCTION CHAR[255] ParseDeviceResponse(CHAR cRawResponse[])
{
    CHAR cProcessedResponse[255]
    INTEGER nStartPos, nEndPos
    
    // Remove control characters
    cProcessedResponse = cRawResponse
    WHILE (FIND_STRING(cProcessedResponse,"$0D",1))
    {
        cProcessedResponse = LEFT_STRING(cProcessedResponse,
            FIND_STRING(cProcessedResponse,"$0D",1)-1),
            RIGHT_STRING(cProcessedResponse,
            LENGTH_STRING(cProcessedResponse) - FIND_STRING(cProcessedResponse,"$0D",1))
    }
    
    // Extract meaningful data
    IF (FIND_STRING(cProcessedResponse,'STATUS=',1))
    {
        nStartPos = FIND_STRING(cProcessedResponse,'STATUS=',1) + 7
        nEndPos = FIND_STRING(cProcessedResponse,',',nStartPos)
        IF (nEndPos == 0) nEndPos = LENGTH_STRING(cProcessedResponse) + 1
        cProcessedResponse = MID_STRING(cProcessedResponse, nStartPos, nEndPos - nStartPos)
    }
    
    RETURN cProcessedResponse
}

// Comprehensive serial device control
DEFINE_CONSTANT
    BAUD_9600          = '9600,N,8,1'
    BAUD_19200         = '19200,N,8,1'
    CMD_BUFFER_SIZE    = 500
    RESPONSE_TIMEOUT   = 5  // seconds

DEFINE_VARIABLE
    CHAR cSerialBuffer[CMD_BUFFER_SIZE]
    INTEGER nCommandPending = FALSE
    LONG lCommandTimer

DEFINE_EVENT
    DATA_EVENT[dvProjector]
    {
        ONLINE:
        {
            SEND_COMMAND dvProjector, "'SET BAUD ',BAUD_9600"
            SEND_COMMAND dvProjector, "'HSOFF'"  // Hardware handshaking off
            SEND_COMMAND dvProjector, "'XOFF'"   // Software flow control off
            InitializeDevice()
        }
        STRING:
        {
            cSerialBuffer = "cSerialBuffer,DATA.TEXT"
            ProcessIncomingData()
        }
        OFFLINE:
        {
            HandleDeviceOffline()
        }
    }

DEFINE_FUNCTION SendSerialCommand(CHAR cCommand[])
{
    IF (nCommandPending)
    {
        // Queue management for busy devices
        QueueCommand(cCommand)
    }
    ELSE
    {
        SEND_STRING dvProjector, "cCommand,$0D"
        nCommandPending = TRUE
        lCommandTimer = LDATE_TO_SEC(LDATE) + RESPONSE_TIMEOUT
    }
}

// Advanced IP device communication
DEFINE_VARIABLE
    INTEGER nSocketConnected = FALSE
    CHAR cIPBuffer[2000]
    LONG lHeartbeatTimer
    INTEGER nReconnectAttempts = 0

DEFINE_EVENT
    DATA_EVENT[dvIPDevice]
    {
        ONLINE:
        {
            nSocketConnected = TRUE
            nReconnectAttempts = 0
            SEND_COMMAND dvIPDevice, "'RXON'"
            StartHeartbeat()
        }
        STRING:
        {
            ProcessIPResponse(DATA.TEXT)
        }
        OFFLINE:
        {
            nSocketConnected = FALSE
            ScheduleReconnect()
        }
    }

DEFINE_FUNCTION ConnectToIPDevice(CHAR cIPAddress[], INTEGER nPort)
{
    SEND_COMMAND dvIPDevice, "'IPOPEN-',cIPAddress,':',ITOA(nPort)"
}

DEFINE_FUNCTION ProcessIPResponse(CHAR cResponse[])
{
    // JSON parsing for modern devices
    INTEGER nJSONStart, nJSONEnd
    CHAR cJSONData[1000]
    
    nJSONStart = FIND_STRING(cResponse,'{',1)
    nJSONEnd = FIND_STRING(cResponse,'}',nJSONStart)
    
    IF (nJSONStart && nJSONEnd)
    {
        cJSONData = MID_STRING(cResponse, nJSONStart, nJSONEnd - nJSONStart + 1)
        ParseJSONResponse(cJSONData)
    }
}

// RESTful API communication for modern devices
DEFINE_FUNCTION SendHTTPRequest(CHAR cMethod[], CHAR cEndpoint[], CHAR cPayload[])
{
    CHAR cHTTPRequest[1500]
    
    cHTTPRequest = "cMethod,' ',cEndpoint,' HTTP/1.1',$0D,$0A,
                   'Host: ',cDeviceIP,$0D,$0A,
                   'Content-Type: application/json',$0D,$0A,
                   'Content-Length: ',ITOA(LENGTH_STRING(cPayload)),$0D,$0A,
                   'Authorization: Bearer ',cAPIToken,$0D,$0A,
                   $0D,$0A,
                   cPayload"
    
    SEND_STRING dvIPDevice, cHTTPRequest
}

// Example: Camera control via HTTP API
DEFINE_FUNCTION MoveCameraPreset(INTEGER nPreset)
{
    CHAR cPayload[200]
    cPayload = "'{\"preset\":',ITOA(nPreset),'}'"
    SendHTTPRequest('POST', '/api/v1/presets/recall', cPayload)
}

// WebSocket implementation for real-time communication
DEFINE_FUNCTION InitializeWebSocket()
{
    CHAR cWebSocketHandshake[500]
    cWebSocketHandshake = "'GET /ws HTTP/1.1',$0D,$0A,
                          'Host: ',cDeviceIP,$0D,$0A,
                          'Upgrade: websocket',$0D,$0A,
                          'Connection: Upgrade',$0D,$0A,
                          'Sec-WebSocket-Key: ',GenerateWebSocketKey(),$0D,$0A,
                          'Sec-WebSocket-Version: 13',$0D,$0A,
                          $0D,$0A"
    
    SEND_STRING dvWebSocketDevice, cWebSocketHandshake
}

Touch Panel Structure
├── Startup Page (System boot/loading)
├── Main Navigation (Primary system access)
├── System Control Pages
│   ├── Audio Control (Volume, routing, EQ)
│   ├── Video Control (Sources, displays, presets)
│   ├── Lighting Control (Scenes, zones, manual)
│   └── Climate Control (Temperature, HVAC modes)
├── Administrative Pages
│   ├── System Settings (Network, time, preferences)
│   ├── Diagnostics (Device status, logs)
│   └── Help/Information (User guides, contact info)
└── Popup/Overlay Pages (Alerts, confirmations)

// Touch panel button programming example
DEFINE_EVENT
    BUTTON_EVENT[dvTouchPanel, nPowerButtons]
    {
        PUSH:
        {
            INTEGER nButtonIndex = GET_LAST(nPowerButtons)
            
            SELECT
            {
                ACTIVE (nButtonIndex == BTN_PROJECTOR_POWER):
                {
                    ToggleProjectorPower()
                }
                ACTIVE (nButtonIndex == BTN_DISPLAY_POWER):
                {
                    ToggleDisplayPower()
                }
                ACTIVE (nButtonIndex == BTN_SYSTEM_POWER):
                {
                    ExecuteSystemPowerToggle()
                }
            }
        }
        HOLD[30]:  // 3-second hold
        {
            // Emergency system shutdown
            EmergencySystemShutdown()
        }
    }

// Dynamic button feedback management
DEFINE_FUNCTION UpdatePowerButtonStates()
{
    // Projector button feedback
    IF (nProjectorPower)
    {
        SEND_COMMAND dvTouchPanel, "'PPON-BTN_PROJECTOR_POWER'"  // Button on
        SEND_COMMAND dvTouchPanel, "'TEXT',ITOA(BTN_PROJECTOR_POWER),'-Projector ON'"
    }
    ELSE
    {
        SEND_COMMAND dvTouchPanel, "'PPOF-BTN_PROJECTOR_POWER'"  // Button off
        SEND_COMMAND dvTouchPanel, "'TEXT',ITOA(BTN_PROJECTOR_POWER),'-Projector OFF'"
    }
}

// Advanced multi-state button control
DEFINE_CONSTANT
    STATE_OFF = 1
    STATE_ON = 2
    STATE_WARMING = 3
    STATE_COOLING = 4
    STATE_ERROR = 5

DEFINE_FUNCTION UpdateProjectorButton(INTEGER nState)
{
    SELECT
    {
        ACTIVE (nState == STATE_OFF):
        {
            SEND_COMMAND dvTouchPanel, "'PPON-BTN_PROJECTOR,',ITOA(STATE_OFF)"
            SEND_COMMAND dvTouchPanel, "'TEXT',ITOA(BTN_PROJECTOR),'-Power On'"
        }
        ACTIVE (nState == STATE_WARMING):
        {
            SEND_COMMAND dvTouchPanel, "'PPON-BTN_PROJECTOR,',ITOA(STATE_WARMING)"
            SEND_COMMAND dvTouchPanel, "'TEXT',ITOA(BTN_PROJECTOR),'-Warming Up...'"
            SEND_COMMAND dvTouchPanel, "'ADBEEP'"  // Audible feedback
        }
        ACTIVE (nState == STATE_ON):
        {
            SEND_COMMAND dvTouchPanel, "'PPON-BTN_PROJECTOR,',ITOA(STATE_ON)"
            SEND_COMMAND dvTouchPanel, "'TEXT',ITOA(BTN_PROJECTOR),'-Power Off'"
        }
    }
}

// Dynamic content generation for touch panels
DEFINE_FUNCTION PopulateSourceList()
{
    INTEGER nIndex
    CHAR cListContent[2000]
    
    FOR (nIndex = 1; nIndex <= nNumSources; nIndex++)
    {
        IF (cSourceNames[nIndex] != '')
        {
            cListContent = "cListContent,'ITEM-',ITOA(nIndex),'|',
                          cSourceNames[nIndex],'|',
                          IIF(nCurrentSource == nIndex,'SELECTED',''),
                          $0D,$0A"
        }
    }
    
    SEND_COMMAND dvTouchPanel, "'LIST-',ITOA(LST_SOURCES),'|',cListContent"
}

// Advanced touch panel event management
DEFINE_EVENT
    LEVEL_EVENT[dvTouchPanel, nVolumeLevels]
    {
        INTEGER nLevelIndex = GET_LAST(nVolumeLevels)
        INTEGER nNewLevel = LEVEL.VALUE
        
        SELECT
        {
            ACTIVE (nLevelIndex == LVL_MASTER_VOLUME):
            {
                SetMasterVolume(nNewLevel)
                SEND_LEVEL dvTouchPanel, LVL_MASTER_FEEDBACK, nNewLevel
            }
            ACTIVE (nLevelIndex >= LVL_ZONE1_VOLUME && 
                    nLevelIndex <= LVL_ZONE8_VOLUME):
            {
                INTEGER nZone = nLevelIndex - LVL_ZONE1_VOLUME + 1
                SetZoneVolume(nZone, nNewLevel)
            }
        }
    }

    CHANNEL_EVENT[dvTouchPanel, nSystemChannels]
    {
        ON:
        {
            INTEGER nChannelIndex = GET_LAST(nSystemChannels)
            ProcessChannelActivation(nChannelIndex)
        }
        OFF:
        {
            INTEGER nChannelIndex = GET_LAST(nSystemChannels)
            ProcessChannelDeactivation(nChannelIndex)
        }
    }

// Screen size adaptation for different panel sizes
DEFINE_FUNCTION AdaptLayoutForPanel(INTEGER nPanelType)
{
    SELECT
    {
        ACTIVE (nPanelType == PANEL_7_INCH):
        {
            SEND_COMMAND dvTouchPanel, "'PSHOW-PAGE_COMPACT'"
            SEND_COMMAND dvTouchPanel, "'FONT-1,14'"  // Smaller fonts
        }
        ACTIVE (nPanelType == PANEL_10_INCH):
        {
            SEND_COMMAND dvTouchPanel, "'PSHOW-PAGE_STANDARD'"
            SEND_COMMAND dvTouchPanel, "'FONT-1,18'"  // Standard fonts
        }
        ACTIVE (nPanelType == PANEL_21_INCH):
        {
            SEND_COMMAND dvTouchPanel, "'PSHOW-PAGE_EXTENDED'"
            SEND_COMMAND dvTouchPanel, "'FONT-1,24'"  // Large fonts
        }
    }
}

// Example: Audio processor module structure
MODULE_NAME='AudioProcessor_Module'(
    DEV vdvControl,           // Virtual device for control
    DEV dvPhysicalDevice,     // Physical device connection
    INTEGER nNumChannels,      // Configuration parameter
    CHAR cModuleName[]        // Instance identification
)

// Module variable space
DEFINE_VARIABLE
    INTEGER nModuleOnline = FALSE
    INTEGER nChannelLevels[32]
    INTEGER nChannelMutes[32]
    CHAR cModuleBuffer[1000]

// Module initialization
DEFINE_START
{
    CREATE_BUFFER dvPhysicalDevice, cModuleBuffer
}

// Module interface events
DEFINE_EVENT
    DATA_EVENT[vdvControl]
    {
        COMMAND:
        {
            CHAR cCmd[50]
            INTEGER nChannel, nValue
            
            cCmd = UPPER_STRING(DATA.TEXT)
            
            SELECT
            {
                ACTIVE (FIND_STRING(cCmd,'VOLUME-',1) == 1):
                {
                    REMOVE_STRING(cCmd,'VOLUME-',1)
                    nChannel = ATOI(LEFT_STRING(cCmd, FIND_STRING(cCmd,',',1)-1))
                    REMOVE_STRING(cCmd,',',1)
                    nValue = ATOI(cCmd)
                    
                    SetChannelVolume(nChannel, nValue)
                }
                ACTIVE (FIND_STRING(cCmd,'MUTE-',1) == 1):
                {
                    REMOVE_STRING(cCmd,'MUTE-',1)
                    nChannel = ATOI(LEFT_STRING(cCmd, FIND_STRING(cCmd,',',1)-1))
                    REMOVE_STRING(cCmd,',',1)
                    nValue = ATOI(cCmd)
                    
                    SetChannelMute(nChannel, nValue)
                }
            }
        }
    }

// Advanced state machine for system control
DEFINE_CONSTANT
    STATE_SYSTEM_OFF      = 0
    STATE_SYSTEM_STARTING = 1
    STATE_SYSTEM_READY    = 2
    STATE_SYSTEM_ACTIVE   = 3
    STATE_SYSTEM_SHUTTING = 4
    STATE_SYSTEM_ERROR    = 5

DEFINE_VARIABLE
    INTEGER nCurrentState = STATE_SYSTEM_OFF
    INTEGER nPreviousState = STATE_SYSTEM_OFF
    LONG lStateTimer
    INTEGER nStateTimeouts[6] = {0, 30, 5, 0, 15, 10}  // Timeout values per state

DEFINE_FUNCTION ChangeSystemState(INTEGER nNewState)
{
    IF (nNewState != nCurrentState)
    {
        nPreviousState = nCurrentState
        nCurrentState = nNewState
        lStateTimer = LDATE_TO_SEC(LDATE)
        
        // Execute state entry actions
        SELECT
        {
            ACTIVE (nNewState == STATE_SYSTEM_STARTING):
            {
                ExecuteStartupSequence()
            }
            ACTIVE (nNewState == STATE_SYSTEM_READY):
            {
                EnableUserInterface()
                SendSystemReadyNotifications()
            }
            ACTIVE (nNewState == STATE_SYSTEM_SHUTTING):
            {
                ExecuteShutdownSequence()
            }
            ACTIVE (nNewState == STATE_SYSTEM_ERROR):
            {
                LogSystemError()
                NotifyAdministrators()
            }
        }
        
        UpdateSystemStatusDisplay()
    }
}

// State monitoring and timeout handling
DEFINE_FUNCTION MonitorSystemStates()
{
    LONG lCurrentTime = LDATE_TO_SEC(LDATE)
    INTEGER nTimeoutValue = nStateTimeouts[nCurrentState]
    
    IF (nTimeoutValue > 0 && (lCurrentTime - lStateTimer > nTimeoutValue))
    {
        // Handle state timeout
        SELECT
        {
            ACTIVE (nCurrentState == STATE_SYSTEM_STARTING):
            {
                ChangeSystemState(STATE_SYSTEM_ERROR)
            }
            ACTIVE (nCurrentState == STATE_SYSTEM_SHUTTING):
            {
                ChangeSystemState(STATE_SYSTEM_OFF)
            }
        }
    }
}

// Sophisticated command queuing system
DEFINE_TYPE
    STRUCTURE strCommand
    {
        DEV dvDevice
        CHAR cCommand[255]
        INTEGER nPriority
        LONG lTimestamp
        INTEGER nRetryCount
    }

DEFINE_VARIABLE
    strCommand CommandQueue[100]
    INTEGER nQueueHead = 1
    INTEGER nQueueTail = 1
    INTEGER nQueueCount = 0

DEFINE_FUNCTION QueueCommand(DEV dvDev, CHAR cCmd[], INTEGER nPri)
{
    IF (nQueueCount < MAX_ARRAY_SIZE(CommandQueue))
    {
        CommandQueue[nQueueTail].dvDevice = dvDev
        CommandQueue[nQueueTail].cCommand = cCmd
        CommandQueue[nQueueTail].nPriority = nPri
        CommandQueue[nQueueTail].lTimestamp = LDATE_TO_SEC(LDATE)
        CommandQueue[nQueueTail].nRetryCount = 0
        
        nQueueTail++
        IF (nQueueTail > MAX_ARRAY_SIZE(CommandQueue)) nQueueTail = 1
        nQueueCount++
        
        // Sort queue by priority if needed
        IF (nPri > NORMAL_PRIORITY) SortQueueByPriority()
    }
}

DEFINE_FUNCTION ProcessCommandQueue()
{
    IF (nQueueCount > 0)
    {
        strCommand CurrentCmd
        CurrentCmd = CommandQueue[nQueueHead]
        
        IF (IsDeviceReady(CurrentCmd.dvDevice))
        {
            SEND_STRING CurrentCmd.dvDevice, CurrentCmd.cCommand
            RemoveFromQueue()
        }
        ELSE IF ((LDATE_TO_SEC(LDATE) - CurrentCmd.lTimestamp) > COMMAND_TIMEOUT)
        {
            // Handle timeout
            CurrentCmd.nRetryCount++
            IF (CurrentCmd.nRetryCount < MAX_RETRIES)
            {
                CurrentCmd.lTimestamp = LDATE_TO_SEC(LDATE)
                CommandQueue[nQueueHead] = CurrentCmd
            }
            ELSE
            {
                LogFailedCommand(CurrentCmd)
                RemoveFromQueue()
            }
        }
    }
}

Presentation Layer (Touch Panels, UI)
        ↕ (Events/Commands)
Business Logic Layer (Control Logic, State Management)
        ↕ (Device Commands/Feedback)  
Data Access Layer (Device Modules, Communication)

// Business logic layer implementation
PROGRAM_NAME='System_Logic_Layer'

// Abstracted device control interface
DEFINE_FUNCTION ControlAVSystem(INTEGER nCommand, INTEGER nParam1, INTEGER nParam2)
{
    SELECT
    {
        ACTIVE (nCommand == CMD_POWER_ON):
        {
            IF (SystemSecurityCheck())
            {
                PowerOnSequence(nParam1)  // Zone parameter
            }
        }
        ACTIVE (nCommand == CMD_SOURCE_SELECT):
        {
            ValidateSourceSelection(nParam1, nParam2)
            RouteSource(nParam1, nParam2)
            UpdateAllTouchPanels()
        }
        ACTIVE (nCommand == CMD_VOLUME_SET):
        {
            IF (nParam2 >= MIN_VOLUME && nParam2 <= MAX_VOLUME)
            {
                SetZoneVolume(nParam1, nParam2)
                UpdateVolumeDisplay(nParam1, nParam2)
            }
        }
    }
}

// Event observer pattern for system notifications
DEFINE_TYPE
    STRUCTURE strObserver
    {
        DEV dvObserver
        INTEGER nEventMask
        CHAR cObserverName[50]
    }

DEFINE_VARIABLE
    strObserver SystemObservers[50]
    INTEGER nObserverCount = 0

DEFINE_FUNCTION RegisterObserver(DEV dvObs, INTEGER nMask, CHAR cName[])
{
    IF (nObserverCount < MAX_ARRAY_SIZE(SystemObservers))
    {
        nObserverCount++
        SystemObservers[nObserverCount].dvObserver = dvObs
        SystemObservers[nObserverCount].nEventMask = nMask
        SystemObservers[nObserverCount].cObserverName = cName
    }
}

DEFINE_FUNCTION BroadcastEvent(INTEGER nEventType, CHAR cEventData[])
{
    INTEGER nIndex
    FOR (nIndex = 1; nIndex <= nObserverCount; nIndex++)
    {
        IF (SystemObservers[nIndex].nEventMask & nEventType)
        {
            SEND_COMMAND SystemObservers[nIndex].dvObserver,
                "'EVENT-',ITOA(nEventType),',',cEventData"
        }
    }
}

// Device factory for creating standardized device handlers
DEFINE_FUNCTION DEV CreateDeviceHandler(CHAR cDeviceType[], DEV dvPhysical, CHAR cConfig[])
{
    DEV dvVirtual
    
    SELECT
    {
        ACTIVE (cDeviceType == 'PROJECTOR'):
        {
            dvVirtual = CreateProjectorHandler(dvPhysical, cConfig)
        }
        ACTIVE (cDeviceType == 'DISPLAY'):
        {
            dvVirtual = CreateDisplayHandler(dvPhysical, cConfig)
        }
        ACTIVE (cDeviceType == 'AUDIO_PROCESSOR'):
        {
            dvVirtual = CreateAudioProcessorHandler(dvPhysical, cConfig)
        }
        ACTIVE (cDeviceType == 'LIGHTING_GATEWAY'):
        {
            dvVirtual = CreateLightingHandler(dvPhysical, cConfig)
        }
    }
    
    RETURN dvVirtual
}

Network Segment Planning:
├── Management Network (192.168.1.0/24)
│   ├── AMX Controllers: 192.168.1.10-19
│   ├── Touch Panels: 192.168.1.20-39
│   └── Network Switches: 192.168.1.240-254
├── Device Control Network (192.168.2.0/24)
│   ├── Displays: 192.168.2.10-49
│   ├── Audio Equipment: 192.168.2.50-89
│   ├── Lighting Controllers: 192.168.2.90-109
│   └── HVAC Integration: 192.168.2.110-129
└── AV Transport Network (192.168.3.0/24)
    ├── Video Encoders/Decoders: 192.168.3.10-99
    ├── Audio Network Devices: 192.168.3.100-199
    └── Streaming Endpoints: 192.168.3.200-254

// Network configuration handler
DEFINE_VARIABLE
    CHAR cControllerIP[16] = '192.168.1.10'
    CHAR cSubnetMask[16] = '255.255.255.0'
    CHAR cDefaultGateway[16] = '192.168.1.1'
    CHAR cDNSServer[16] = '8.8.8.8'

DEFINE_FUNCTION ConfigureNetwork()
{
    // Configure network parameters
    SEND_COMMAND 0, "'SET IP ',cControllerIP,',',cSubnetMask,',',cDefaultGateway"
    SEND_COMMAND 0, "'SET DNS ',cDNSServer"
    
    // Enable DHCP if required
    // SEND_COMMAND 0, "'SET DHCP AUTO'"
    
    // Configure NTP for time synchronization
    SEND_COMMAND 0, "'SET NTP pool.ntp.org'"
}

// Comprehensive HTTP client for device control
DEFINE_FUNCTION SendHTTPCommand(DEV dvDevice, CHAR cMethod[], CHAR cURI[], CHAR cData[])
{
    CHAR cHTTPHeader[1000]
    CHAR cContentLength[10]
    
    cContentLength = ITOA(LENGTH_STRING(cData))
    
    cHTTPHeader = "cMethod,' ',cURI,' HTTP/1.1',$0D,$0A,
                   'Host: ',GetDeviceIP(dvDevice),$0D,$0A,
                   'User-Agent: AMX-NetLinx/1.0',$0D,$0A,
                   'Accept: application/json',$0D,$0A,
                   'Content-Type: application/json',$0D,$0A,
                   'Content-Length: ',cContentLength,$0D,$0A,
                   'Connection: keep-alive',$0D,$0A,
                   $0D,$0A,
                   cData"
    
    SEND_STRING dvDevice, cHTTPHeader
}

// Response parsing
DEFINE_FUNCTION ParseHTTPResponse(CHAR cResponse[])
{
    INTEGER nStatusCode
    CHAR cStatusLine[100]
    CHAR cResponseBody[2000]
    INTEGER nHeaderEnd
    
    // Extract status line
    cStatusLine = LEFT_STRING(cResponse, FIND_STRING(cResponse,"$0D,$0A",1)-1)
    nStatusCode = ATOI(MID_STRING(cStatusLine, 10, 3))  // Extract status code
    
    // Find end of headers
    nHeaderEnd = FIND_STRING(cResponse,"$0D,$0A,$0D,$0A",1)
    IF (nHeaderEnd > 0)
    {
        cResponseBody = RIGHT_STRING(cResponse, 
            LENGTH_STRING(cResponse) - nHeaderEnd - 3)
        ProcessJSONResponse(cResponseBody, nStatusCode)
    }
}

// MQTT client implementation for IoT integration
DEFINE_CONSTANT
    MQTT_CONNECT     = $10
    MQTT_CONNACK     = $20
    MQTT_PUBLISH     = $30
    MQTT_SUBSCRIBE   = $82

DEFINE_VARIABLE
    INTEGER nMQTTConnected = FALSE
    CHAR cMQTTClientID[50] = 'AMX_Controller_01'

DEFINE_FUNCTION ConnectMQTTBroker(CHAR cBrokerIP[], INTEGER nPort)
{
    CHAR cConnectPacket[100]
    INTEGER nPacketLength
    
    // Build MQTT CONNECT packet
    cConnectPacket = "$10"  // Message type
    // Add remaining length and payload
    cConnectPacket = "cConnectPacket,$00,$04,'MQTT',$04,$C0,$00,$3C"  // Protocol name and flags
    cConnectPacket = "cConnectPacket,$00,ITOA(LENGTH_STRING(cMQTTClientID)),cMQTTClientID"
    
    SEND_STRING dvMQTTDevice, cConnectPacket
}

DEFINE_FUNCTION PublishMQTTMessage(CHAR cTopic[], CHAR cPayload[])
{
    IF (nMQTTConnected)
    {
        CHAR cPublishPacket[500]
        cPublishPacket = "$30"  // PUBLISH message type
        cPublishPacket = "cPublishPacket,CalculateRemainingLength(LENGTH_STRING(cTopic) + LENGTH_STRING(cPayload) + 2)"
        cPublishPacket = "cPublishPacket,$00,ITOA(LENGTH_STRING(cTopic)),cTopic"
        cPublishPacket = "cPublishPacket,cPayload"
        
        SEND_STRING dvMQTTDevice, cPublishPacket
    }
}

// Network security management
DEFINE_CONSTANT
    SECURITY_LEVEL_ADMIN = 4
    SECURITY_LEVEL_OPERATOR = 3
    SECURITY_LEVEL_USER = 2
    SECURITY_LEVEL_GUEST = 1

DEFINE_VARIABLE
    INTEGER nCurrentSecurityLevel = SECURITY_LEVEL_GUEST
    CHAR cCurrentUser[50]
    LONG lSessionTimeout

DEFINE_FUNCTION INTEGER AuthenticateUser(CHAR cUsername[], CHAR cPassword[])
{
    INTEGER nSecurityLevel = 0
    
    // Hash password for comparison
    CHAR cPasswordHash[64]
    cPasswordHash = SHA256Hash(cPassword)
    
    // Check against user database
    IF (ValidateCredentials(cUsername, cPasswordHash))
    {
        nSecurityLevel = GetUserSecurityLevel(cUsername)
        cCurrentUser = cUsername
        lSessionTimeout = LDATE_TO_SEC(LDATE) + SESSION_TIMEOUT_SECONDS
        LogSecurityEvent("'User login: ',cUsername")
    }
    ELSE
    {
        LogSecurityEvent("'Failed login attempt: ',cUsername")
    }
    
    RETURN nSecurityLevel
}

DEFINE_FUNCTION INTEGER CheckSecurityAccess(INTEGER nRequiredLevel)
{
    IF (LDATE_TO_SEC(LDATE) > lSessionTimeout)
    {
        LogoutCurrentUser()
        RETURN FALSE
    }
    
    RETURN (nCurrentSecurityLevel >= nRequiredLevel)
}

// Comprehensive system monitoring implementation
DEFINE_VARIABLE
    INTEGER nSystemHealth = 100
    LONG lLastDiagnostic
    CHAR cDiagnosticReport[2000]

DEFINE_FUNCTION RunSystemDiagnostics()
{
    CHAR cReport[2000]
    INTEGER nDeviceCount = 0
    INTEGER nOnlineDevices = 0
    
    cReport = "'=== SYSTEM DIAGNOSTIC REPORT ===',$0D,$0A"
    cReport = "cReport,'Timestamp: ',GetCurrentTimestamp(),$0D,$0A,$0D,$0A"
    
    // Device status check
    INTEGER nIndex
    FOR (nIndex = 1; nIndex <= LENGTH_ARRAY(dvDeviceList); nIndex++)
    {
        nDeviceCount++
        IF (IsDeviceOnline(dvDeviceList[nIndex]))
        {
            nOnlineDevices++
            cReport = "cReport,'[ONLINE ] Device ',ITOA(nIndex),': ',
                      GetDeviceName(dvDeviceList[nIndex]),$0D,$0A"
        }
        ELSE
        {
            cReport = "cReport,'[OFFLINE] Device ',ITOA(nIndex),': ',
                      GetDeviceName(dvDeviceList[nIndex]),$0D,$0A"
        }
    }
    
    // Calculate system health percentage
    nSystemHealth = (nOnlineDevices * 100) / nDeviceCount
    
    cReport = "cReport,$0D,$0A,'System Health: ',ITOA(nSystemHealth),'%',$0D,$0A"
    cReport = "cReport,'Memory Usage: ',GetMemoryUsage(),$0D,$0A"
    cReport = "cReport,'CPU Utilization: ',GetCPUUsage(),$0D,$0A"
    
    cDiagnosticReport = cReport
    lLastDiagnostic = LDATE_TO_SEC(LDATE)
    
    // Broadcast diagnostic information
    BroadcastEvent(EVENT_DIAGNOSTIC_COMPLETE, cReport)
}

// Advanced performance monitoring
DEFINE_TYPE
    STRUCTURE strPerformanceMetrics
    {
        LONG lStartTime
        LONG lEndTime
        LONG lDuration
        CHAR cFunctionName[50]
        INTEGER nCallCount
    }

DEFINE_VARIABLE
    strPerformanceMetrics PerformanceLog[100]
    INTEGER nPerformanceLogIndex = 1

DEFINE_FUNCTION StartPerformanceTimer(CHAR cFunctionName[])
{
    PerformanceLog[nPerformanceLogIndex].cFunctionName = cFunctionName
    PerformanceLog[nPerformanceLogIndex].lStartTime = GET_TIMER
    PerformanceLog[nPerformanceLogIndex].nCallCount++
}

DEFINE_FUNCTION StopPerformanceTimer(CHAR cFunctionName[])
{
    INTEGER nIndex
    FOR (nIndex = nPerformanceLogIndex; nIndex >= 1; nIndex--)
    {
        IF (PerformanceLog[nIndex].cFunctionName == cFunctionName && 
            PerformanceLog[nIndex].lEndTime == 0)
        {
            PerformanceLog[nIndex].lEndTime = GET_TIMER
            PerformanceLog[nIndex].lDuration = 
                PerformanceLog[nIndex].lEndTime - PerformanceLog[nIndex].lStartTime
            
            // Log performance if duration exceeds threshold
            IF (PerformanceLog[nIndex].lDuration > PERFORMANCE_THRESHOLD)
            {
                LogPerformanceIssue(PerformanceLog[nIndex])
            }
            BREAK
        }
    }
    
    nPerformanceLogIndex++
    IF (nPerformanceLogIndex > MAX_ARRAY_SIZE(PerformanceLog))
        nPerformanceLogIndex = 1
}

// Advanced logging framework
DEFINE_CONSTANT
    LOG_LEVEL_ERROR   = 1
    LOG_LEVEL_WARNING = 2
    LOG_LEVEL_INFO    = 3
    LOG_LEVEL_DEBUG   = 4
    
    LOG_TO_CONSOLE    = 1
    LOG_TO_FILE       = 2
    LOG_TO_NETWORK    = 4

DEFINE_VARIABLE
    INTEGER nLogLevel = LOG_LEVEL_INFO
    INTEGER nLogOutput = LOG_TO_CONSOLE
    CHAR cLogBuffer[10000]

DEFINE_FUNCTION WriteLog(INTEGER nLevel, CHAR cComponent[], CHAR cMessage[])
{
    IF (nLevel <= nLogLevel)
    {
        CHAR cLogEntry[500]
        CHAR cLevelText[10]
        
        SELECT
        {
            ACTIVE (nLevel == LOG_LEVEL_ERROR):   cLevelText = 'ERROR'
            ACTIVE (nLevel == LOG_LEVEL_WARNING): cLevelText = 'WARN '
            ACTIVE (nLevel == LOG_LEVEL_INFO):    cLevelText = 'INFO '
            ACTIVE (nLevel == LOG_LEVEL_DEBUG):   cLevelText = 'DEBUG'
        }
        
        cLogEntry = "'[',GetCurrentTimestamp(),'] [',cLevelText,'] [',
                    cComponent,']: ',cMessage,$0D,$0A"
        
        IF (nLogOutput & LOG_TO_CONSOLE)
        {
            SEND_STRING 0, cLogEntry
        }
        
        IF (nLogOutput & LOG_TO_FILE)
        {
            AppendToLogFile(cLogEntry)
        }
        
        IF (nLogOutput & LOG_TO_NETWORK)
        {
            SendNetworkLog(cLogEntry)
        }
    }
}

// Specialized logging functions
DEFINE_FUNCTION LogDeviceEvent(DEV dvDevice, CHAR cEvent[])
{
    WriteLog(LOG_LEVEL_INFO, "'DEV_',ITOA(dvDevice.NUMBER)", cEvent)
}

DEFINE_FUNCTION LogSystemError(CHAR cError[])
{
    WriteLog(LOG_LEVEL_ERROR, 'SYSTEM', cError)
}

DEFINE_FUNCTION LogUserAction(CHAR cUser[], CHAR cAction[])
{
    WriteLog(LOG_LEVEL_INFO, 'USER', "'User ',cUser,' performed: ',cAction")
}

// Basic unit testing framework for AMX
DEFINE_VARIABLE
    INTEGER nTestsPassed = 0
    INTEGER nTestsFailed = 0
    CHAR cTestResults[2000]

DEFINE_FUNCTION RunUnitTests()
{
    WriteLog(LOG_LEVEL_INFO, 'TESTING', 'Starting unit test suite')
    
    // Reset test counters
    nTestsPassed = 0
    nTestsFailed = 0
    cTestResults = ''
    
    // Run individual test functions
    TestStringFunctions()
    TestMathFunctions()
    TestDeviceCommunication()
    TestStateMachines()
    
    // Generate test report
    GenerateTestReport()
}

DEFINE_FUNCTION AssertEquals(CHAR cTestName[], INTEGER nExpected, INTEGER nActual)
{
    IF (nExpected == nActual)
    {
        nTestsPassed++
        cTestResults = "cTestResults,'[PASS] ',cTestName,$0D,$0A"
        WriteLog(LOG_LEVEL_DEBUG, 'TEST', "'PASS: ',cTestName")
    }
    ELSE
    {
        nTestsFailed++
        cTestResults = "cTestResults,'[FAIL] ',cTestName,' - Expected: ',
                       ITOA(nExpected),' Got: ',ITOA(nActual),$0D,$0A"
        WriteLog(LOG_LEVEL_ERROR, 'TEST', "'FAIL: ',cTestName,' - Expected: ',
                 ITOA(nExpected),' Got: ',ITOA(nActual)")
    }
}

DEFINE_FUNCTION TestStringFunctions()
{
    CHAR cTestString[100] = 'Hello World'
    INTEGER nResult
    
    nResult = LENGTH_STRING(cTestString)
    AssertEquals('StringLength_Test', 11, nResult)
    
    nResult = FIND_STRING(cTestString, 'World', 1)
    AssertEquals('FindString_Test', 7, nResult)
}

// Communication diagnostic function
DEFINE_FUNCTION DiagnoseDeviceCommunication(DEV dvDevice)
{
    CHAR cDiagnostic[500]
    
    cDiagnostic = "'=== DEVICE COMMUNICATION DIAGNOSTIC ===',$0D,$0A"
    cDiagnostic = "cDiagnostic,'Device: ',ITOA(dvDevice.NUMBER),':',
                   ITOA(dvDevice.PORT),':',ITOA(dvDevice.SYSTEM),$0D,$0A"
    
    // Check physical connectivity
    IF (IsDeviceOnline(dvDevice))
    {
        cDiagnostic = "cDiagnostic,'Physical Connection: ONLINE',$0D,$0A"
        
        // Test communication parameters
        SEND_COMMAND dvDevice, "'GET BAUD'"
        SEND_COMMAND dvDevice, "'GET PARITY'"
        SEND_COMMAND dvDevice, "'GET DATA'"
        SEND_COMMAND dvDevice, "'GET STOP'"
        
        // Send test command
        SEND_STRING dvDevice, "'TEST',$0D"
        
    }
    ELSE
    {
        cDiagnostic = "cDiagnostic,'Physical Connection: OFFLINE',$0D,$0A"
        cDiagnostic = "cDiagnostic,'Troubleshooting steps:',$0D,$0A"
        cDiagnostic = "cDiagnostic,'1. Check cable connections',$0D,$0A"
        cDiagnostic = "cDiagnostic,'2. Verify device power',$0D,$0A"
        cDiagnostic = "cDiagnostic,'3. Check device configuration',$0D,$0A"
    }
    
    WriteLog(LOG_LEVEL_INFO, 'DIAGNOSTIC', cDiagnostic)
}

// Auto-recovery mechanism
DEFINE_FUNCTION ImplementDeviceRecovery(DEV dvDevice)
{
    INTEGER nRecoveryAttempts = 0
    
    WHILE (nRecoveryAttempts < MAX_RECOVERY_ATTEMPTS && !IsDeviceOnline(dvDevice))
    {
        nRecoveryAttempts++
        
        SELECT
        {
            ACTIVE (nRecoveryAttempts == 1):
            {
                // Attempt to reset communication parameters
                SEND_COMMAND dvDevice, "'SET BAUD 9600,N,8,1'"
                WAIT 20
            }
            ACTIVE (nRecoveryAttempts == 2):
            {
                // Try alternative baud rate
                SEND_COMMAND dvDevice, "'SET BAUD 19200,N,8,1'"
                WAIT 20
            }
            ACTIVE (nRecoveryAttempts == 3):
            {
                // Reset port
                SEND_COMMAND dvDevice, "'PORT_RESET'"
                WAIT 30
            }
        }
    }
    
    IF (IsDeviceOnline(dvDevice))
    {
        WriteLog(LOG_LEVEL_INFO, 'RECOVERY', 
                "'Device ',ITOA(dvDevice.NUMBER),' recovered after ',
                ITOA(nRecoveryAttempts),' attempts'")
    }
    ELSE
    {
        WriteLog(LOG_LEVEL_ERROR, 'RECOVERY', 
                "'Device ',ITOA(dvDevice.NUMBER),' recovery failed'")
    }
}

// Touch panel health monitoring
DEFINE_FUNCTION MonitorTouchPanelHealth(DEV dvTP)
{
    // Check memory usage
    SEND_COMMAND dvTP, "'?MEMORY'"
    
    // Check firmware version
    SEND_COMMAND dvTP, "'?VERSION'"
    
    // Test button responsiveness
    SEND_COMMAND dvTP, "'BEEP'"
    
    // Monitor network connectivity
    IF (dvTP.NUMBER >= 10000)  // IP-based touch panel
    {
        SEND_COMMAND dvTP, "'?IPADDRESS'"
        SEND_COMMAND dvTP, "'PING'"
    }
}

// Touch panel recovery procedures
DEFINE_FUNCTION RecoverTouchPanel(DEV dvTP)
{
    WriteLog(LOG_LEVEL_WARNING, 'TP_RECOVERY', 
            "'Initiating recovery for touch panel ',ITOA(dvTP.NUMBER)")
    
    // Clear any stuck states
    SEND_COMMAND dvTP, "'PPCLEAR'"
    
    // Reset to home page
    SEND_COMMAND dvTP, "'PSHOW-PAGE_HOME'"
    
    // Force screen refresh
    SEND_COMMAND dvTP, "'REFRESH'"
    
    // If IP panel, attempt reconnection
    IF (dvTP.NUMBER >= 10000)
    {
        SEND_COMMAND dvTP, "'RECONNECT'"
    }
}

// Memory management best practices
DEFINE_FUNCTION CleanupResources()
{
    // Clear unused string buffers
    INTEGER nIndex
    FOR (nIndex = 1; nIndex <= MAX_ARRAY_SIZE(cTempBuffers); nIndex++)
    {
        IF (cTempBuffers[nIndex] != '' && 
            (LDATE_TO_SEC(LDATE) - lBufferTimestamps[nIndex]) > BUFFER_TIMEOUT)
        {
            cTempBuffers[nIndex] = ''
            WriteLog(LOG_LEVEL_DEBUG, 'MEMORY', 
                    "'Cleaned up buffer ',ITOA(nIndex)")
        }
    }
    
    // Force garbage collection if available
    SEND_COMMAND 0, "'GC'"
}

// Performance monitoring
DEFINE_FUNCTION MonitorSystemPerformance()
{
    // Check system statistics
    SEND_COMMAND 0, "'?MEMORY'"
    SEND_COMMAND 0, "'?CPU'"
    SEND_COMMAND 0, "'?PROCESSES'"
    
    // Monitor event queue depth
    IF (nEventQueueDepth > QUEUE_WARNING_THRESHOLD)
    {
        WriteLog(LOG_LEVEL_WARNING, 'PERFORMANCE', 
                "'Event queue depth high: ',ITOA(nEventQueueDepth)")
    }
    
    // Check for runaway loops
    IF (nLoopCounter > LOOP_WARNING_THRESHOLD)
    {
        WriteLog(LOG_LEVEL_ERROR, 'PERFORMANCE', 
                "'Potential infinite loop detected'")
        // Implement emergency break mechanism
    }
}

// Network diagnostic suite
DEFINE_FUNCTION RunNetworkDiagnostics()
{
    // Check network configuration
    SEND_COMMAND 0, "'?IPADDRESS'"
    SEND_COMMAND 0, "'?NETMASK'"
    SEND_COMMAND 0, "'?GATEWAY'"
    SEND_COMMAND 0, "'?DNS'"
    
    // Test connectivity to key network resources
    SEND_COMMAND 0, "'PING ',cDefaultGateway"
    SEND_COMMAND 0, "'PING 8.8.8.8'"  // Test external connectivity
    
    // Check ARP table for device discovery
    SEND_COMMAND 0, "'?ARP'"
}

DEFINE_FUNCTION TestDeviceConnectivity(CHAR cDeviceIP[])
{
    DEV dvTestSocket = 33001:1:0
    
    // Attempt TCP connection
    SEND_COMMAND dvTestSocket, "'IPOPEN-',cDeviceIP,':23'"
    
    // Set timeout for connection test
    WAIT 50
    {
        IF (!IsDeviceOnline(dvTestSocket))
        {
            WriteLog(LOG_LEVEL_ERROR, 'NETWORK', 
                    "'Cannot connect to device at ',cDeviceIP")
            
            // Try alternative port
            SEND_COMMAND dvTestSocket, "'IPOPEN-',cDeviceIP,':80'"
        }
        ELSE
        {
            WriteLog(LOG_LEVEL_INFO, 'NETWORK', 
                    "'Successfully connected to ',cDeviceIP")
            SEND_COMMAND dvTestSocket, "'IPCLOSE'"
        }
    }
}

(***********************************************************)
(* AMX Programming Standards and Conventions              *)
(* Project: Conference Room Control System                *)
(* Programmer: Senior AV Programmer                       *)
(* Last Modified: 2025-01-15                             *)
(***********************************************************)

// Device naming convention: dv[SystemType][DeviceType][Number]
DEFINE_DEVICE
    dvConfRoomProjector1    = 5001:1:0    // Conference room projector
    dvConfRoomAudioDSP      = 5001:2:0    // Audio processing unit
    dvConfRoomLightGateway  = 5001:3:0    // Lighting control gateway
    dvConfRoomTouchPanel1   = 10001:1:0   // Primary touch panel
    dvConfRoomTouchPanel2   = 10002:1:0   // Secondary touch panel

// Constant naming: Use descriptive UPPER_CASE names
DEFINE_CONSTANT
    // Button channel definitions
    BTN_SYSTEM_POWER        = 1
    BTN_PROJECTOR_POWER     = 2
    BTN_SCREEN_UP          = 3
    BTN_SCREEN_DOWN        = 4
    
    // System state definitions
    SYSTEM_STATE_OFF        = 0
    SYSTEM_STATE_STARTING   = 1
    SYSTEM_STATE_READY      = 2
    SYSTEM_STATE_ACTIVE     = 3
    
    // Configuration parameters
    MAX_VOLUME_LEVEL        = 100
    STARTUP_DELAY_SECONDS   = 30
    SHUTDOWN_DELAY_SECONDS  = 15

// Variable naming: Use descriptive camelCase for globals, nPrefix for integers
DEFINE_VARIABLE
    INTEGER nCurrentSystemState = SYSTEM_STATE_OFF
    INTEGER nMasterVolumeLevel = 50
    INTEGER nProjectorWarmupTime = 60
    CHAR cCurrentSourceName[50] = 'No Source'
    CHAR cSystemStatusMessage[100] = 'System Ready'

// Function organization: Group related functions together
(***********************************************************)
(* SYSTEM CONTROL FUNCTIONS                               *)
(***********************************************************)

DEFINE_FUNCTION InitializeSystem()
{
    WriteLog(LOG_LEVEL_INFO, 'INIT', 'System initialization started')
    
    // Initialize hardware interfaces
    InitializeAudioProcessing()
    InitializeVideoSwitching()
    InitializeLightingControl()
    InitializeEnvironmentalSystems()
    
    // Set initial system state
    nCurrentSystemState = SYSTEM_STATE_READY
    
    // Update all user interfaces
    UpdateAllTouchPanelStatus()
    
    WriteLog(LOG_LEVEL_INFO, 'INIT', 'System initialization completed')
}

DEFINE_FUNCTION INTEGER ValidateSystemOperation()
{
    INTEGER nValidationResult = TRUE
    
    // Check critical system components
    IF (!IsDeviceOnline(dvConfRoomProjector1))
    {
        WriteLog(LOG_LEVEL_ERROR, 'VALIDATE', 'Projector offline')
        nValidationResult = FALSE
    }
    
    IF (!IsDeviceOnline(dvConfRoomAudioDSP))
    {
        WriteLog(LOG_LEVEL_ERROR, 'VALIDATE', 'Audio DSP offline')
        nValidationResult = FALSE
    }
    
    // Validate network connectivity for IP devices
    IF (!ValidateNetworkDevices())
    {
        WriteLog(LOG_LEVEL_ERROR, 'VALIDATE', 'Network device validation failed')
        nValidationResult = FALSE
    }
    
    RETURN nValidationResult
}

(***********************************************************)
(* USER INTERFACE FUNCTIONS                               *)
(***********************************************************)

DEFINE_FUNCTION UpdateTouchPanelButton(DEV dvTP, INTEGER nButton, INTEGER nState, CHAR cText[])
{
    // Update button state
    IF (nState)
    {
        SEND_COMMAND dvTP, "'PPON-',ITOA(nButton),',',ITOA(nState)"
    }
    ELSE
    {
        SEND_COMMAND dvTP, "'PPOF-',ITOA(nButton)"
    }
    
    // Update button text if provided
    IF (cText != '')
    {
        SEND_COMMAND dvTP, "'TEXT',ITOA(nButton),'-',cText"
    }
}

DEFINE_FUNCTION BroadcastToAllTouchPanels(CHAR cCommand[])
{
    INTEGER nPanelIndex
    FOR (nPanelIndex = 1; nPanelIndex <= LENGTH_ARRAY(dvTouchPanelList); nPanelIndex++)
    {
        IF (IsDeviceOnline(dvTouchPanelList[nPanelIndex]))
        {
            SEND_COMMAND dvTouchPanelList[nPanelIndex], cCommand
        }
    }
}

// Optimize event handling for high-traffic scenarios
DEFINE_EVENT
    DATA_EVENT[dvAudioProcessor]
    {
        STRING:
        {
            // Process only relevant data to avoid unnecessary string operations
            IF (FIND_STRING(DATA.TEXT, 'LEVEL', 1) == 1)
            {
                ProcessLevelUpdate(DATA.TEXT)
            }
            ELSE IF (FIND_STRING(DATA.TEXT, 'MUTE', 1) == 1)
            {
                ProcessMuteUpdate(DATA.TEXT)
            }
            ELSE IF (FIND_STRING(DATA.TEXT, 'ERROR', 1) == 1)
            {
                ProcessErrorMessage(DATA.TEXT)
            }
            // Discard other messages to avoid buffer bloat
        }
    }

// Batch processing for multiple similar operations
DEFINE_FUNCTION UpdateMultipleChannels(INTEGER nStartChannel, INTEGER nEndChannel, INTEGER nValue)
{
    INTEGER nChannel
    CHAR cBatchCommand[500]
    
    // Build batch command instead of sending individual commands
    cBatchCommand = "'BATCH_START',$0D"
    FOR (nChannel = nStartChannel; nChannel <= nEndChannel; nChannel++)
    {
        cBatchCommand = "cBatchCommand,'LEVEL,',ITOA(nChannel),',',ITOA(nValue),$0D"
    }
    cBatchCommand = "cBatchCommand,'BATCH_END',$0D"
    
    SEND_STRING dvAudioProcessor, cBatchCommand
}

// Efficient string handling and buffer management
DEFINE_CONSTANT
    BUFFER_POOL_SIZE = 10
    BUFFER_SIZE = 1000

DEFINE_VARIABLE
    CHAR cBufferPool[BUFFER_POOL_SIZE][BUFFER_SIZE]
    INTEGER nBufferInUse[BUFFER_POOL_SIZE]

DEFINE_FUNCTION CHAR[BUFFER_SIZE] GetBuffer()
{
    INTEGER nBufferIndex
    FOR (nBufferIndex = 1; nBufferIndex <= BUFFER_POOL_SIZE; nBufferIndex++)
    {
        IF (!nBufferInUse[nBufferIndex])
        {
            nBufferInUse[nBufferIndex] = TRUE
            cBufferPool[nBufferIndex] = ''  // Clear buffer
            RETURN cBufferPool[nBufferIndex]
        }
    }
    
    // No available buffers - return empty string and log warning
    WriteLog(LOG_LEVEL_WARNING, 'MEMORY', 'Buffer pool exhausted')
    RETURN ''
}

DEFINE_FUNCTION ReleaseBuffer(CHAR cBuffer[])
{
    INTEGER nBufferIndex
    FOR (nBufferIndex = 1; nBufferIndex <= BUFFER_POOL_SIZE; nBufferIndex++)
    {
        IF (cBufferPool[nBufferIndex] == cBuffer)
        {
            nBufferInUse[nBufferIndex] = FALSE
            cBufferPool[nBufferIndex] = ''
            BREAK
        }
    }
}

// Comprehensive security framework
DEFINE_CONSTANT
    ACCESS_LEVEL_ADMINISTRATOR = 5
    ACCESS_LEVEL_TECHNICIAN   = 4
    ACCESS_LEVEL_OPERATOR     = 3
    ACCESS_LEVEL_USER         = 2
    ACCESS_LEVEL_GUEST        = 1

DEFINE_TYPE
    STRUCTURE strUserAccount
    {
        CHAR cUsername[50]
        CHAR cPasswordHash[64]
        INTEGER nAccessLevel
        LONG lLastLogin
        INTEGER nLoginAttempts
        INTEGER nAccountLocked
    }

DEFINE_VARIABLE
    strUserAccount UserAccounts[50]
    INTEGER nCurrentUserLevel = ACCESS_LEVEL_GUEST
    CHAR cCurrentUsername[50] = 'Guest'

DEFINE_FUNCTION INTEGER AuthenticateUser(CHAR cUsername[], CHAR cPassword[])
{
    INTEGER nUserIndex = FindUserAccount(cUsername)
    
    IF (nUserIndex > 0)
    {
        // Check if account is locked
        IF (UserAccounts[nUserIndex].nAccountLocked)
        {
            WriteLog(LOG_LEVEL_WARNING, 'SECURITY', 
                    "'Login attempt on locked account: ',cUsername")
            RETURN FALSE
        }
        
        // Verify password
        CHAR cProvidedHash[64]
        cProvidedHash = CalculateSHA256(cPassword)
        
        IF (cProvidedHash == UserAccounts[nUserIndex].cPasswordHash)
        {
            // Successful authentication
            nCurrentUserLevel = UserAccounts[nUserIndex].nAccessLevel
            cCurrentUsername = cUsername
            UserAccounts[nUserIndex].lLastLogin = LDATE_TO_SEC(LDATE)
            UserAccounts[nUserIndex].nLoginAttempts = 0
            
            WriteLog(LOG_LEVEL_INFO, 'SECURITY', 
                    "'User authenticated: ',cUsername,' (Level ',
                    ITOA(nCurrentUserLevel),')'")
            RETURN TRUE
        }
        ELSE
        {
            // Failed authentication
            UserAccounts[nUserIndex].nLoginAttempts++
            IF (UserAccounts[nUserIndex].nLoginAttempts >= MAX_LOGIN_ATTEMPTS)
            {
                UserAccounts[nUserIndex].nAccountLocked = TRUE
                WriteLog(LOG_LEVEL_ERROR, 'SECURITY', 
                        "'Account locked due to failed attempts: ',cUsername")
            }
        }
    }
    
    WriteLog(LOG_LEVEL_WARNING, 'SECURITY', 
            "'Authentication failed for: ',cUsername")
    RETURN FALSE
}

DEFINE_FUNCTION INTEGER CheckAccessPermission(INTEGER nRequiredLevel)
{
    RETURN (nCurrentUserLevel >= nRequiredLevel)
}

// Scheduled maintenance framework
DEFINE_VARIABLE
    LONG lLastMaintenanceCheck
    INTEGER nMaintenanceSchedule[7] = {0,0,0,0,0,0,1}  // Sunday maintenance

DEFINE_FUNCTION RunScheduledMaintenance()
{
    WriteLog(LOG_LEVEL_INFO, 'MAINTENANCE', 'Starting scheduled maintenance')
    
    // Clean up temporary files and buffers
    CleanupSystemResources()
    
    // Verify device configurations
    VerifyDeviceConfigurations()
    
    // Update system diagnostics
    GenerateMaintenanceReport()
    
    // Perform system backup if configured
    IF (nAutoBackupEnabled)
    {
        CreateSystemBackup()
    }
    
    // Update last maintenance timestamp
    lLastMaintenanceCheck = LDATE_TO_SEC(LDATE)
    
    WriteLog(LOG_LEVEL_INFO, 'MAINTENANCE', 'Scheduled maintenance completed')
}

DEFINE_FUNCTION CreateSystemBackup()
{
    CHAR cBackupFilename[100]
    CHAR cTimestamp[20]
    
    cTimestamp = GetFormattedTimestamp('YYYY-MM-DD_HH-MM-SS')
    cBackupFilename = "'SystemBackup_',cTimestamp,'.cfg'"
    
    // Export system configuration
    SEND_COMMAND 0, "'EXPORT_CONFIG ',cBackupFilename"
    
    // Backup touch panel files
    BackupTouchPanelFiles()
    
    // Create documentation snapshot
    GenerateSystemDocumentation()
    
    WriteLog(LOG_LEVEL_INFO, 'BACKUP', 
            "'System backup created: ',cBackupFilename")
}

DEFINE_FUNCTION SendCommandWithTimeout(DEV dvDevice, CHAR cCommand[], INTEGER nTimeoutSeconds)
{
    SEND_STRING dvDevice, cCommand
    nCommandPending[dvDevice.NUMBER] = TRUE
    lCommandTimestamp[dvDevice.NUMBER] = LDATE_TO_SEC(LDATE)
    
    // Set timeout handler
    WAIT (nTimeoutSeconds * 10) 'CommandTimeout'
    {
        IF (nCommandPending[dvDevice.NUMBER])
        {
            ProcessCommandTimeout(dvDevice, cCommand)
        }
    }
}

DEFINE_FUNCTION UpdateAllPanels(INTEGER nButton, INTEGER nState, CHAR cText[])
{
    INTEGER nPanelIndex
    FOR (nPanelIndex = 1; nPanelIndex <= MAX_PANELS; nPanelIndex++)
    {
        IF (IsDeviceOnline(dvPanelList[nPanelIndex]))
        {
            UpdateTouchPanelButton(dvPanelList[nPanelIndex], nButton, nState, cText)
        }
    }
}

Main Program (System orchestration)
├── Device Control Layer (Individual device modules)
├── Business Logic Layer (System intelligence and rules)
├── Communication Layer (Protocol handlers and networking)
├── User Interface Layer (Touch panel management)
└── Utility Layer (Logging, diagnostics, maintenance)