allow to set client id of mqtt connection in config, to support multiple instances of sungather

SunGather/config-example.yaml

@@ -64,6 +64,7 @@ exports:
     # topic: "inverter/{model}/registers"   # [Optional] Default: "inverter/{model}/registers", Variable {model} will be replaced with model number of inverter
     # username:                             # [Optional] Username is MQTT server requires it
     # password:                             # [Optional] Password is MQTT server requires it
+    # client_id:                            # [Optional] Client id for mqtt connection. Defaults to "SunGather", need to be set to different values if you want to run multiple instances of sungather.
     homeassistant: True                     # [Optional] Default False, Publish discovery and sensors for HomeAssistant
     ha_sensors:                             # [Optional] / [Required] ha_discovery: True, Topics to enable discovery for HA
       - name: "Daily Generation"

SunGather/exports/mqtt.py

@@ -14,6 +14,7 @@ class export_mqtt(object):
         self.mqtt_config = {
             'host': config.get('host', None),
             'port': config.get('port', 1883),
+            'client_id': config.get('client_id', 'SunGather'),
             'topic': config.get('topic', "inverter/{model}/registers").replace('{model}', inverter.getInverterModel(True)),
             'username': config.get('username', None),
             'password': config.get('password',None),
@@ -26,8 +27,8 @@ class export_mqtt(object):
         if not self.mqtt_config['host']:
             logging.info(f"MQTT: Host config is required")
             return False
-
-        self.mqtt_client = mqtt.Client(client_id="SunGather")
+        client_id = self.mqtt_config['client_id']
+        self.mqtt_client = mqtt.Client(client_id)
         self.mqtt_client.on_connect = self.on_connect
         self.mqtt_client.on_disconnect = self.on_disconnect
         self.mqtt_client.on_publish = self.on_publish
@@ -108,4 +109,4 @@ class export_mqtt(object):
             self.ha_discovery_published = True
             logging.info("MQTT: Published Home Assistant Discovery messages")
 
-        return True
+        return True