MQTT Essentials：A Lightweight IoT Protocol
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  1. MQTT runs on top of:
    1. The MQIP protocol.
    2. The TCP/IP protocol.
    3. The IoT protocol.
  2. The data for an MQTT message is known as:
    1. Payload.
    2. Packet.
    3. Upload.
  3. In MQTT version 3.1.1, the broker is named:
    1. MQTT agent.
    2. MQTT client.
    3. MQTT server.
  4. QoS level 0 for MQTT means:
    1. Exactly once delivery
    2. At most once delivery
    3. At least once delivery
  5. QoS level 1 for MQTT means:
    1. Exactly once delivery
    2. At most once delivery
    3. At least once delivery
  6. QoS level 2 for MQTT means:
    1. Exactly once delivery
    2. At most once delivery
    3. At least once delivery
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