January 2018
Intermediate to advanced
524 pages
13h 33m
English
Content preview from Internet of Things for Architects
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MQTT communication formats
A communication link using MQTT starts with the client sending a CONNECT message to a broker. Only a client can initiate a session and no client may communicate directly with another client. The broker will always respond back to a CONNECT message with a CONNACK response and status code. Once established the connection remains open. The following are the MQTT messages and formats:
- CONNECT format (client to server): A typical CONNECT message will contain the following (only the clientID is required to initiate a session):
|
Field |
Requirement |
Description |
|
clientID |
Required |
Identifies client to the server. Each client has a unique client ID. It can be between 1 and 23 UTF-8 bytes long. |
|
cleanSession ... |
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