Howto propagate MQTT messages from EMQx broker to Mattermost webhook

• Create or re-use a Mattermost incoming webhook URL.
• Log into EMQx dashboard
• Create a new webhook resource, add your url, give it a recognisable name

https://mattermost.science.ru.nl/hooks/xxx-generatedkey-xxx

• Create a new rule, for instance:

SELECT topic, payload FROM "building/RSS/#" 
WHERE topic not in ("building/RSS/daemon time", "building/RSS/Ready for sweep", "building/RSS/Door config")

• Publish to your webhook resource using Mattermost format (JSON)

 {"text": "${topic}: ${payload}"}

• This will now go to the default channel of the webhook. It is possible to add "channel": "channelname" into the JSON payload.

Radiation Safety System

daemon/service - a computer program that runs as a background process