Subscribe to a Topic

When an application is subscribed to a topic on an MQTT broker, it will receive any data that is published to that topic on that broker. In order to subscribe to a topic on an MQTT broker endpoint using the MQTT Protocol Adapter, you must define a block in the configuration file of type cdpin. The following block configuration example will subscribe to the topic input_data on the broker located at broker.ip.com:1883.

"mqtt_subscriber": {
    "type": "cdpin",
    "config": {
        "transport_addr": "mqtt-tcp://broker.ip.com:1883",
        "method": "sub",
        "node_ref": "input_data",
        "log_level": "info",
        "log_name": "mqtt_subscribe_test"
    }
}