This program utilizes node-red programming environment, mosquitto MQTT broker and python.
python3 -m venv venv
. venv/bin/activate
python3 -m pip install -r requirements.txt
Copy config.dist.py to config.py and fill out passwords and other local configuration.
Main files:
lights.pyis ModbusTCP controller class;mqtt_bridge.pyMQTT client that serves lights class data to MQTTconfig.pyconfiguration
Extra configuration is under resources/lightcontroller.conf.
Copy that file to /etc/mosquitto/conf.d.
Generate a password with:
mkdir /etc/mosquitto/passwords
chown mosquitto: /etc/mosquitto/passwords
chmod go= /etc/mosquitto/passwords
mosquitto_passwd -c /etc/mosquitto/passwords/passwords first_user
Add additional users with:
mosquitto_passwd -b /etc/mosquitto/passwords/passwords additional_user
from pyModbusTCP.client import ModbusClient
c1 = ModbusClient(host='192.168.200.104',auto_open=True,auto_close=True);
c2 = ModbusClient(host='192.168.200.129',auto_open=True,auto_close=True);
c.open() # Reset watchdog:
c.write_single_register(0x1121,0xbecf)
c.write_single_register(0x1121,0xaffe)
c.close()
print("Watchdog time: ", c.read_holding_registers(0x1020))
c.read_holding_registers(0x1012) # Number of digital outputs
c.read_holding_registers(0x1013) # Number of digital inputs