MQTT Serial Bridge

🔺 This project is superseded by Microsquad and is now archived. 🔺

A serial port to MQTT bridge in Java with Spring Boot affinities and support for multiple MQTT naming conventions and message formats.

Current Features

• 🛠️ Supports YAML configuration / Spring cloud client-friendly.
• 🌍️ Deployed to jitpack.io for easy access.
• 🍽️ Provides embedded MQTT broker support via Moquette.
• 🏠️ Provides MQTT Homie naming convention adapters [https://homieiot.github.io/].
• 🔌️ Provides pluggable message formatters (JSON, line protocol)

Planned Features

• 👷️ Expose JMX MBeans for monitoring
• 🔌️ Support MQTT RPC for remote serial port control

How to use the bridge library

The Jitpack way

• Download the Spring Boot service distribution, for instance version 0.1 :

wget https://jitpack.io/com/github/chibyhq/mqtt-serial-bridge/msb-service/0.1/msb-service-0.1.jar

⚠️ Please remember to replace 0.1 in the command above by the version number you wish to use.

• Create a Spring Boot configuration in application.yml :

msb.serial:
  port: ttyACM0
  baudrate: 115200
msb.mqtt:
  server.enable: true
  forward: true
  client:
    id: ${random.uuid}
    server.uri: "tcp://localhost:1883"

• Connect your serial device using the port name and baud rate indicated in your configuration

• Fire up your MQTT client (e.g. MQTT Explorer) - you should see the following topics, for instance :

  • /homie/<hostname>/serial/ttyACM0/in for messages you want to send to your serial device.
  • /homie/<hostname>/serial/ttyACM0/out for messages you want to collect from your serial device

Samples

• Spring-boot based service example.
• Microbit serial line protocol to JSON websocket MQTT sample application.