MQTT action

The action is used for publish output message into a MQTT server.

Property name	Optional	Description
server	false	The broker address of the mqtt server, such as `tcp://127.0.0.1:1883`
topic	false	The mqtt topic, such as `analysis/result`
clientId	true	The client id for mqtt connection. If not specified, an uuid will be used
protocol_version	true	3.1 (also refer as MQTT 3) or 3.1.1 (also refer as MQTT 4). If not specified, the default value is 3.1.
username	true	The user name for the connection.
password	true	The password for the connection.

Below is one of the sample configuration.

{
  "mqtt": {
  	"server": "tcp://sink_server:1883",
  	"topic": "demoSink",
  	"clientId": "client_id_1",
    "protocol_version": "3.1.1"
  }
}