MQTT publish json

[admin]

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