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Tip

Review the MQTT Transmission Transmitters and Tag Trees documentation for help in identifying your Edge Node(s) and Device(s).

If using UDTs you should include each member tag of a UDT in your count when determining the number of tags.


MQTT Transmission History Store requires the following parameters:

  • Type
    • The type of History Store with options of In-Memory and Disk-Backed
    • Data stored in an In-Memory History Store will not be persisted across a module configuration change, module disable/enable, module restart or power loss. 
    • Data stored in a Disk-Backed History Store will persist across a module configuration change, module disable/enable, module restart or power loss.
  • History Max Age
    • Maximum number of minutes to store history before dropping the data.
  • Flush Quantity
    • The maximum number of tags to publish in a single message upon reestablishing communication.
    • Default 10,000
  • Flush Period
    • The period to wait in milliseconds between publishes when flushing messages upon reestablishing communication.
    • Default 200

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