Let's see whether you can answer the following questions correctly:
- The PubNub MQTT interface requires us to use a client ID composed as follows:
- publish_key/subscribe_key/device_id
- device_id/publish_key/subscribe_key
- publish_key/device_id
- When we publish a message to the PubNub MQTT interface:
- It is only available on the PubNub MQTT subnetwork
- It becomes available on the PubNub network
- It requires a specific payload prefix to become available on the PubNub network
- Which of the following methods of the paho.mqtt.client.Client instance allows us to specify the callback function that the client has to call when it receives a message in a specific topic:
- message_callback_add
- message_arrived_to_topic_callback
- message_on_topic