MQTT publish json

[JohnTH]

You can use event script to publish and disconnect after publish, like in this post: https://forum.logicmachine.net/showthread.php?tid=1793
Use json.encode to create your data string instead of creating JSON string manually.

This code will publish once connected and disconnect once publish is done.

Code:

client.ON_CONNECT = function(stat, code, err)
 if stat then
   client:publish('devices/' .. device_id .. '/messages/events/', data)
 else
   log('mqtt connect error', err, code)
 end
end

client.ON_PUBLISH = function()
 client:disconnect()
 running = false
end

Thanks! I will give it a try.