update

Author: Tom Softreck

modapi/api/__init__.py

@@ -0,0 +1,15 @@
+"""
+modapi.api - API modules for Modbus communication
+"""
+
+from .rest import create_rest_app
+from .mqtt import start_mqtt_broker
+from .cmd import execute_command
+from .shell import interactive_mode
+
+__all__ = [
+    'create_rest_app',
+    'start_mqtt_broker',
+    'execute_command',
+    'interactive_mode'
+]

simulate_modbus.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+"""
+Modbus RTU Server Simulator
+"""
+from pymodbus.server.sync import StartSerialServer
+from pymodbus.datastore import ModbusSlaveContext, ModbusServerContext
+from pymodbus.datastore import ModbusSequentialDataBlock
+
+def run_simulator(port: str = "/tmp/ptyp0", baudrate: int = 9600):
+    """Run a Modbus RTU server simulator"""
+    # Initialize data stores
+    store = ModbusSlaveContext(
+        di=ModbusSequentialDataBlock(0, [0]*100),  # Discrete Inputs
+        co=ModbusSequentialDataBlock(0, [0]*100),  # Coils
+        hr=ModbusSequentialDataBlock(0, [0]*100),  # Holding Registers
+        ir=ModbusSequentialDataBlock(0, [0]*100)   # Input Registers
+    )
+    
+    context = ModbusServerContext(slaves=store, single=True)
+    
+    # Set some test values
+    store.setValues(1, 0, [1, 0, 1, 0])  # Coils 0-3
+    store.setValues(3, 0, [1234, 5678, 9012])  # Holding Registers 0-2
+    
+    print(f"Starting Modbus RTU simulator on {port} at {baudrate} baud")
+    print("Test values set:")
+    print("  - Coils 0-3: [1, 0, 1, 0]")
+    print("  - Holding Registers 0-2: [1234, 5678, 9012]")
+    
+    # Start the server
+    StartSerialServer(
+        context,
+        port=port,
+        baudrate=baudrate,
+        timeout=0.1
+    )
+
+if __name__ == "__main__":
+    run_simulator()