Pico LTE - Support for Generic MQTT Mosquitto Server

Sixfab Pico LTE
1

I have been able to get the Pico LTE to connect with ThinkSpeak and publish data without issue. But many users including myself would need to use a self-hosted generic Mosquitto server. I have been unable to get this to work. Unfortunately all the supplied solutions are for commercial server solutions. Any plans to include code for a generic self hosted MQTT server? This would be most helpful. Thanks! Nice device!

2

Apart from the apps provided, there are options to use the modules such as HTTP and MQTT by their own – with your desired server, data, method etc. You can check out the MQTT module for your Mosquitto server in here: https://github.com/sixfab/pico_lte_micropython-sdk/blob/master/pico_lte/modules/mqtt.py

I guess you could use:

# Open a MQTT connection.
pico.mqtt.open_connection(YOUR_HOST, YOUR_PORT)
# Login to broker.
pico.mqtt.connect_broker(username=YOUR_USERNAME, password=YOUR_PASSWORD)
# Publish a message.
pico.mqtt.publish_message("SOME_MESSAGE", topic=TOPIC_TO_PUBLISH)
# Subscribe to topics
topics = [(SUBSCRIPTION_ADDR, QoS_VALUE)]
pico.mqtt.subscribe_topics(topics)

# Read messages
first_time = time.time()
while time.time() - first_time < TIMEOUT_SEC:
    result = pico.mqtt.read_messages()
    print(result["messages"])

# Unsubscribe from the topics
modem.mqtt.unsubscribe_topic(SUBSCRIPTION_ADDR)

# Close connection
modem.mqtt.close_connection()

It’s an example. Remember to check the result statuses of each function you use.

4 Likes
3

Thanks so much electricalgorithm! That was really helpful in getting me started. I got the publishing working perfectly. Had to tweak the mqtt.py a bit. Now I’ll start on the subscribe. This is a really nice device.