fix on_message topic parsing, time example, bump minor version

Author: brentru

Adafruit_IO/_version.py

@@ -1 +1 @@
-__version__ = "2.3"
+__version__ = "2.3.1"

Adafruit_IO/mqtt_client.py

@@ -103,23 +103,26 @@ def _mqtt_disconnect(self, client, userdata, rc):
             self.on_disconnect(self)
 
     def _mqtt_message(self, client, userdata, msg):
-        logger.debug('Client on_message called.')
         """Parse out the topic and call on_message callback
         assume topic looks like `username/topic/id`
         """
+        logger.debug('Client on_message called.')
         parsed_topic = msg.topic.split('/')
-        if self.on_message is not None and parsed_topic[2] == 'weather':
-            topic = parsed_topic[4] # parse out the forecast type
-            payload = '' if msg.payload is None else msg.payload.decode('utf-8')
-        elif self.on_message is not None and parsed_topic[0] == 'time':
-            topic = parsed_topic[0]
-            payload = msg.payload.decode('utf-8')
-        elif self.on_message is not None and parsed_topic[1] == 'groups':
-            topic = parsed_topic[3]
-            payload = msg.payload.decode('utf-8')
-        else: # default topic
-            topic = parsed_topic[2]
-            payload = '' if msg.payload is None else msg.payload.decode('utf-8')
+        if self.on_message is not None:
+            if parsed_topic[0] == 'time':
+                topic = parsed_topic[0]
+                payload = msg.payload.decode('utf-8')    
+            elif parsed_topic[1] == 'groups':
+                topic = parsed_topic[3]
+                payload = msg.payload.decode('utf-8')
+            elif parsed_topic[2] == 'weather':
+                topic = parsed_topic[4]
+                payload = '' if msg.payload is None else msg.payload.decode('utf-8')    
+            else:
+                topic = parsed_topic[2]
+                payload = '' if msg.payload is None else msg.payload.decode('utf-8')
+        else:
+            raise ValueError('on_message not defined')
         self.on_message(self, topic, payload)
 
     def _mqtt_subscribe(client, userdata, mid, granted_qos):

examples/mqtt/mqtt_time.py

@@ -48,17 +48,14 @@ def message(client, feed_id, payload):
 # Connect to the Adafruit IO server.
 client.connect()
 
-# time per loop
-loop_time = 2
+# Subscribe to the time feeds
+print('* Subscribing to time/seconds')
+client.subscribe_time('seconds')
 
-client.loop_background()
-while True:
-    print('* Subscribing to /time/seconds')
-    client.subscribe_time('seconds')
-    time.sleep(loop_time)
-    print('* Subscribing to /time/millis')
-    client.subscribe_time('millis')
-    time.sleep(loop_time)
-    print('* Subscribing to iso-8601')
-    client.subscribe_time('iso')
-    time.sleep(loop_time)
+print('* Subscribing to time/millis')
+client.subscribe_time('millis')
+
+print('* Subscribing to time/ISO-8601')
+client.subscribe_time('iso')
+
+client.loop_blocking()