Updated to allow for redundant MQTT broker.

main.py

@@ -9,6 +9,7 @@ import dht
 import urequests
 import wifi_config
 import mqtt_config
+import ha_mqtt_config
 
 # Change this GPIO PIN where your DHT22 sensor is connected
 DHT_22_GPIO_PIN = 3
@@ -120,6 +121,15 @@ def main():
         server = mqtt_config.MQTT_HOST_NAME,
         )
 
+    # Create Home Assistant MQTT Client
+    ha_mqtt_client = MQTTClient(
+        client_id = ha_mqtt_config.MQTT_CLIENT_ID,
+        server = ha_mqtt_config.MQTT_HOST_NAME,
+        keepalive = ha_mqtt_config.MQTT_KEEP,
+        user = ha_mqtt_config.MQTT_USERNAME,
+        password = ha_mqtt_config.MQTT_PASSWORD,
+        )
+
     # Create DHT22
     sensor = dht.DHT22(Pin(DHT_22_GPIO_PIN))
     
@@ -177,22 +187,39 @@ def main():
         except:
             continue
 
-        # MQTT Conneciton.
+        # MQTT Connection to Primary Broker.
         try:
+            mqtt_client.connect(clean_session = False)
+            mqtt_ready = True
+            mqtt = 'mosquitto'
+            if DEBUG:
+                print(f'Connected to Mosquitto MQTT broker.')
+        
+        except Exception as e:
+            if DEBUG:
+                print("Trouble to connecting to Mosquitto MQTT: {}".format(e))
+
+
+        # MQTT Connection to Back Up Broker.
+        if not mqtt_ready:
             try:
-                mqtt_client.connect(clean_session = False)
+                try:
-                mqtt_ready = True
+                    ha_mqtt_client.connect(clean_session = False)
-                if DEBUG:
+                    mqtt_ready = True
-                    print(f'MQTT Connected.')
+                    mqtt = 'ha'
-            
+                    if DEBUG:
-            except Exception as e:
+                        print(f'Connected to the back up, Home Assistant, MQTT broker.')
-                if DEBUG:
+                
-                    print("Trouble to connecting to MQTT: {}".format(e))
+                except Exception as f:
-                led_error_code(led, 2)
+                    if DEBUG:
-                time.sleep(5)
+                        print("Trouble to connecting to Home Assistant MQTT: {}".format(f))
-                continue # Start back at the top of the While Loop        
+                    led_error_code(led, 2)
-        except:
+                    time.sleep(5)
-            continue
+                    continue # Start back at the top of the While Loop
+
+            except:
+                continue
+
 
         # Ready to Publish?
         try:
@@ -216,15 +243,27 @@ def main():
                     'WiFi Information':ifconfig,
                 }
                 hw_payload = json.dumps(hw_data)
-                
-                # Publish
-                mqtt_client.publish("home/{}".format(mqtt_config.MQTT_ZONE_ID),dht_payload, retain=True)
-                mqtt_client.publish("hw/{}".format(mqtt_config.MQTT_HW_ID),hw_payload, retain=True)
-        
-                mqtt_client.disconnect()
-                if DEBUG:
-                    print(f'MQTT Disconnected.')
 
+                if DEBUG:
+                    print(f'Trying to publish...')
+
+                
+                if mqtt == 'mosquitto':
+                    # Publish
+                    mqtt_client.publish("home/{}".format(mqtt_config.MQTT_ZONE_ID),dht_payload, retain=True)
+                    mqtt_client.publish("hw/{}".format(mqtt_config.MQTT_HW_ID),hw_payload, retain=True)
+                    mqtt_client.disconnect()
+                    if DEBUG:
+                        print(f'MQTT Disconnected.')
+                
+                if mqtt == 'ha':
+                    # Publish
+                    ha_mqtt_client.publish("home/{}".format(mqtt_config.MQTT_ZONE_ID),dht_payload, retain=True)
+                    ha_mqtt_client.publish("hw/{}".format(mqtt_config.MQTT_HW_ID),hw_payload, retain=True)
+                    ha_mqtt_client.disconnect()
+                    if DEBUG:
+                        print(f'MQTT Disconnected.')
+                    
         except:
             continue