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- Client ID
Optional MQTT client ID to use. If specified this will be used in the MQTT Transmission connect packet when connecting to the server. If left blank, a random client ID will be create of the form 'MT-xxxxxxxx-xxxx-xxxx'.
Warning Caution: MQTT Clients IDs must be unique and if two clients attempt to connect with the same client ID, one will be forcefully disconnected from the server to allow the other client to connect.
Keep AliveAnchor Keep Alive Keep Alive - The maximum interval in seconds (5-65,535) between any two MQTT protocol control packets sent by the client to the server.
- The minimum Keep Alive for MQTT Transmission is 5.
- If the client is idle and has no control packets to send, it will send PINGREQ protocol packet and the server is required to respond with a PINGRESP packet. If no response is received from the server within 1.5 times the Keep Alive, the client will close the connection.
If the server does not receive, at minimum, a PINGREQ message from a client within 1.5 times the Keep Alive, it will terminate the connection and send the client's LWT if it has been defined.
For MQTT Transmission, this is an DEATH message.
- Random Startup Delay
- The clients variable reconnect delay in milliseconds - not set by default
- Entered in the format of Random Startup Delay in milliseconds of the form 'min-max' where min is the low end and max is the high end of the random range. e.g. '10-1000'.
- Used to minimise "NBIRTH message storms" on reconnect from Edge nodes with many clients
- Reconnect Delay
- The clients fixed reconnect delay in millisecond.milliseconds with a default of 1000
- Subscribe to Legacy STATE Topic
- Allow the Transmission Client to subscribe to a legacy state topic (eg. STATE/IamHost) for primary host ID notifications (available from release 4.0.16)
- Review Changes to the STATE messages in the Sparkplug v3.0.0 Specification
- Data Format Type
- The format of the data to send. Default is Sparkplug_B_v1_0_Protobuf with JSON as an option.
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If both the Random Startup Delay and the Reconnect Delay are configured, the startup delay for any one client will be the aggregate of the two configured values. For example, with the Random Startup Delay = 10-1000ms and the Reconnect Delay = 1000ms, the startup delay for any one client will be between 1010 and 2000ms |
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