go-coap-mqtt

go-coap-mqtt is a CoAP <-> MQTT gateway written in Go.

Messages can be sent and received from both MQTT and CoAP. The following ways of exchanging messages are supported:

• Publishing an MQTT message to a particular topic
• Making a CoAP POST /pub request with a JSON body containing the topic and payload
• Subscribing to a particular MQTT topic
• Observing the CoAP GET /sub/{topic} endpoint

This project was developed as part of the university course of Telematica.

Testing

The test container has two CLI tools installed for interacting with the gateway and MQTT broker: mqtt and coap-cli. You can get an interactive shell inside the container with docker compose exec test bash.

To make a CoAP request of the /pub endpoint use:

coap-cli post pub -h gateway -p 5688 -d '{"topic":"test","payload":"hello from coap"}' 

To make a CoAP request to the /sub endpoint use:

coap-cli get sub/test -h gateway -p 5688 -o

To publish an MQTT message use:

mqtt pub --host mqtt-broker --topic test -m "hello from mqtt"

To subscribe to MQTT messages use:

mqtt sub --host mqtt-broker --topic test