Update README.md

Add MQTT connection error handling

.github/FUNDING.yml

@@ -0,0 +1 @@
+ko_fi: blakeblackshear

README.md

@@ -1,3 +1,5 @@
+<a href='https://ko-fi.com/P5P7XGO9' target='_blank'><img height='36' style='border:0px;height:36px;' src='https://az743702.vo.msecnd.net/cdn/kofi4.png?v=2' border='0' alt='Buy Me a Coffee at ko-fi.com' /></a>
+
 # Frigate - Realtime Object Detection for RTSP Cameras
 **Note:** This version requires the use of a [Google Coral USB Accelerator](https://coral.withgoogle.com/products/accelerator/)
 

detect_objects.py

@@ -25,6 +25,15 @@ def main():
     # connect to mqtt and setup last will
     def on_connect(client, userdata, flags, rc):
         print("On connect called")
+        if rc != 0:
+            if rc == 3:
+                print ("MQTT Server unavailable")
+            elif rc == 4:
+                print ("MQTT Bad username or password")
+            elif rc == 5:
+                print ("MQTT Not authorized")
+            else:
+                print ("Unable to connect to MQTT: Connection refused. Error code: " + str(rc))
         # publish a message to signal that the service is running
         client.publish(MQTT_TOPIC_PREFIX+'/available', 'online', retain=True)
     client = mqtt.Client()
@@ -87,4 +96,4 @@ def main():
     camera.join()
 
 if __name__ == '__main__':
-    main()
+    main()