ModBus software works, MQTT bridge software added.

software/rs485_client_to_mqtt/mqtt_callbacks.py

@@ -0,0 +1,10 @@
+import logging
+
+def on_connect(client, userdata, flags, reason_code, properties=None):
+    logging.info("Connected to MQTT broker.")
+
+def on_message(client, userdata, message, properties=None):
+    logging.info(f"(Received message {message.payload} on topic '{message.topic}' with QoS {message.qos}")
+
+def on_subscribe(client, userdata, mid, qos, properties=None):
+    logging.info(f"Subscribed with QoS {qos}")