63 lines
2 KiB
Python
63 lines
2 KiB
Python
"""
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'subscribe.py'
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==========================
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Subscribes to an Adafruit IO Feed
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Author(s): Brent Rubell, Todd Treece for Adafruit Industries
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"""
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# Import standard python modules.
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import sys
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# This example uses the MQTTClient instead of the REST 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 = 'counter'
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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
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Adafruit IO.This is a good place to subscribe to feed changes. The client
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parameter passed to this function is the Adafruit IO MQTT client so you
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can make calls against it easily.
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"""
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# Subscribe to changes on a feed named Counter.
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print('Subscribing to Feed {0}'.format(FEED_ID))
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client.subscribe(FEED_ID)
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print('Waiting for feed data...')
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def disconnected(client):
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"""Disconnected function will be called when the client disconnects."""
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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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"""
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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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# The first option is to run a thread in the background so you can continue
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# doing things in your program.
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client.loop_blocking()
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