Using MQTT with MaixPy MaixCAM for Message Subscription and Publishing

MQTT Introduction

MQTT allows for quick and easy real-time communication using a publish-subscribe model.

System components:

• MQTT Server (broker): Responsible for forwarding messages.
• MQTT Clients: Subscribe to topics from the server, receive messages, and publish messages to specific topics on the server.

Communication process:

• Clients connect to the MQTT server.
• Clients subscribe to topics they are interested in, such as topic1.
• When other clients or the server publish information on the topic1 topic, it is pushed to the subscribing clients in real time.
• Clients can also actively publish messages to specific topics. All clients subscribed to that topic will receive the messages. For example, if a client publishes a message to topic1, all clients subscribed to topic1 will receive it, including the publishing client itself.

Using MQTT in MaixPy MaixCAM

The paho-mqtt module can be used for this purpose. You can look up the usage of paho-mqtt online or refer to the examples in the MaixPy/examples repository.

If you are using an older system, you might need to manually install the paho-mqtt package. Installation instructions can be found in the Adding Extra Python Packages guide.