ModuleBase

NAVFoundation.ModuleBase

A base framework for building NetLinx modules with standardized event handling and communication patterns.

Overview

ModuleBase provides the foundation for creating reusable NetLinx modules with consistent:

• Device state management
• SNAPI event processing
• Property and passthru event callbacks
• Communication buffer handling

Architecture

The library is designed around the _NAVModule struct (defined in NAVFoundation.Core) and provides event-driven callbacks for module communication.

Key Components

• _NAVModulePropertyEvent: Handles property change events from SNAPI devices
• _NAVModulePassthruEvent: Handles passthru data events
• Event Callbacks: Optional callback system for processing module events

Breaking Changes (Latest Version)

Important: This version removes automatic module initialization. You must now manually declare and initialize your module.

What Changed

• ❌ Removed: Global _NAVModule variable declaration
• ❌ Removed: Automatic NAVModuleInit() call in DEFINE_START
• ✅ Added: Consumer must declare module variable and initialization

Migration Guide

Before (Old Version):

#include 'NAVFoundation.ModuleBase.axi'

// Module was automatically declared and initialized

After (New Version):

#include 'NAVFoundation.ModuleBase.axi'

// You must now declare the module variable
DEFINE_VARIABLE
_NAVModule myModule

// You must now initialize the module
DEFINE_START {
    NAVModuleInit(myModule)
}

Usage

1. Include the Library

#include 'NAVFoundation.ModuleBase.axi'

2. Declare Module Variable

In your main .axs file:

DEFINE_VARIABLE

_NAVModule myModule

3. Initialize the Module

DEFINE_START {
    NAVModuleInit(myModule)
}

4. Optional: Enable Event Callbacks

Define the virtual device and enable callbacks:

#define USING_NAV_MODULE_BASE_CALLBACKS
#define USING_NAV_MODULE_BASE_PROPERTY_EVENT_CALLBACK
#define USING_NAV_MODULE_BASE_PASSTHRU_EVENT_CALLBACK

define_function NAVModulePropertyEventCallback(_NAVModulePropertyEvent event) {
    switch (event.Name) {
        case NAV_MODULE_PROPERTY_EVENT_IP_ADDRESS: {
            // Handle IP address changes
        }
        case NAV_MODULE_PROPERTY_EVENT_PORT: {
            // Handle port changes
        }
    }
}

define_function NAVModulePassthruEventCallback(_NAVModulePassthruEvent event) {
    // Handle passthru data
}

API Reference

Functions

• NAVModuleInit(_NAVModule module): Initialize module with default values

Events

The library automatically handles data_event[vdvObject] for:

• Property Events: Device configuration changes (IP, port, credentials, etc.)
• Passthru Events: Raw data transmission through the module

Dependencies

• NAVFoundation.Core.h.axi (for _NAVModule struct)
• NAVFoundation.ArrayUtils.axi
• NAVFoundation.SnapiHelpers.axi