135845a90e
the message callback does not get any retain parameter. fixing the following trace...
```
Traceback (most recent call last):
File "./pubsub.py", line 63, in <module>
client.loop_blocking()
File "/usr/local/lib/python3.5/dist-packages/Adafruit_IO/mqtt_client.py", line 152, in loop_blocking
self._client.loop_forever()
File "/usr/local/lib/python3.5/dist-packages/paho/mqtt/client.py", line 1481, in loop_forever
rc = self.loop(timeout, max_packets)
File "/usr/local/lib/python3.5/dist-packages/paho/mqtt/client.py", line 1003, in loop
rc = self.loop_read(max_packets)
File "/usr/local/lib/python3.5/dist-packages/paho/mqtt/client.py", line 1284, in loop_read
rc = self._packet_read()
File "/usr/local/lib/python3.5/dist-packages/paho/mqtt/client.py", line 1849, in _packet_read
rc = self._packet_handle()
File "/usr/local/lib/python3.5/dist-packages/paho/mqtt/client.py", line 2305, in _packet_handle
return self._handle_publish()
File "/usr/local/lib/python3.5/dist-packages/paho/mqtt/client.py", line 2500, in _handle_publish
self._handle_on_message(message)
File "/usr/local/lib/python3.5/dist-packages/paho/mqtt/client.py", line 2647, in _handle_on_message
self.on_message(self, self._userdata, message)
File "/usr/local/lib/python3.5/dist-packages/Adafruit_IO/mqtt_client.py", line 108, in _mqtt_message
self.on_message(self, feed, payload)
TypeError: message() missing 1 required positional argument: 'retain'
```
60 lines
2.2 KiB
Python
60 lines
2.2 KiB
Python
# Example of using the MQTT client class to subscribe to a feed and print out
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# any changes made to the feed. Edit the variables below to configure the key,
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# username, and feed to subscribe to for changes.
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# Import standard python modules.
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import sys
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# Import Adafruit IO MQTT client.
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from Adafruit_IO import MQTTClient
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# Set to your Adafruit IO key.
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# Remember, your key is a secret,
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# so make sure not to publish it when you publish this code!
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ADAFRUIT_IO_KEY = 'YOUR_AIO_KEY'
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# Set to your Adafruit IO username.
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# (go to https://accounts.adafruit.com to find your username)
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ADAFRUIT_IO_USERNAME = 'YOUR_AIO_USERNAME'
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# Set to the ID of the feed to subscribe to for updates.
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FEED_ID = 'DemoFeed'
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# Define callback functions which will be called when certain events happen.
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def connected(client):
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# Connected function will be called when the client is connected to Adafruit IO.
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# This is a good place to subscribe to feed changes. The client parameter
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# passed to this function is the Adafruit IO MQTT client so you can make
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# calls against it easily.
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print('Connected to Adafruit IO! Listening for {0} changes...'.format(FEED_ID))
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# Subscribe to changes on a feed named DemoFeed.
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client.subscribe(FEED_ID)
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def disconnected(client):
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# Disconnected function will be called when the client disconnects.
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print('Disconnected from Adafruit IO!')
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sys.exit(1)
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def message(client, feed_id, payload):
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# Message function will be called when a subscribed feed has a new value.
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# The feed_id parameter identifies the feed, and the payload parameter has
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# the new value.
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print('Feed {0} received new value: {1}'.format(feed_id, payload))
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# Create an MQTT client instance.
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client = MQTTClient(ADAFRUIT_IO_USERNAME, ADAFRUIT_IO_KEY)
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# Setup the callback functions defined above.
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client.on_connect = connected
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client.on_disconnect = disconnected
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client.on_message = message
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# Connect to the Adafruit IO server.
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client.connect()
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# Start a message loop that blocks forever waiting for MQTT messages to be
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# received. Note there are other options for running the event loop like doing
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# so in a background thread--see the mqtt_client.py example to learn more.
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client.loop_blocking()
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