legoino-mqtt-bridge

Retrieve data from serial devices when queried and publish it as MQTT messages.

Installation

When it will be published: $ npm i legoino-mqtt-bridge

Usage from CLI

You can clone the project and want to run it from the command line. The index.js script accepts one command line argument: the broker address. The broker address is optional, default is localhost:1883.

Run normally:

npm start <brokerAddress>

Run in debug mode:

npm start-dev <brokerAddress>

MQTT topics standard

We define an MQTT topics standard: each topic sent to the bridge is composed of the device type, followed by a "q" (query) or "a" (answer), followed by the device unique id and finally the command asked for. The packages that will be sent from node-red to the bridge won't have any content. Reading MQTT doc confirmed that it is indeed optional for publish messages.

Send a command to a serial device

The query topics format:

bioreactor/q/<id>/<cmd>

Query for all connected serial devices

Use the following topic to get a list of all existing serial devices:

bioreactor/q/list

Answer topics

To listen to all the answers of the bridge, subscribe to this topic:

bioreactor/a/#

API Documentation

License

MIT