A PINGRESP message is the response to a PINGREQ message and means "yes I am alive". Keep Alive messages flow in either direction, sent either by a connected client or the broker.
The table below shows the fixed header format:
bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
---|---|---|---|---|---|---|---|---|
byte 1 | Message Type (13) | DUP flag | QoS level | RETAIN | ||||
1 | 1 | 0 | 1 | x | x | x | x | |
byte 2 | Remaining Length (0) | |||||||
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The DUP, QoS, and RETAIN flags are not used.
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