KB90669
Published: August 17, 2023
Revision: 3.0

Tag status updates from MQTT are erratic or delayed when Sparkplug payload compression is enabled


Applies To:

Firmware for the following groov EPICs:

  • GRV-EPIC-PR1
  • GRV-EPIC-PR2
Firmware for the following groov RIOs:
  • GRV-R7-MM1001-10
  • GRV-R7-MM2001-10
  • GRV-R7-I1VAPM-3

Versions Affected:

For groov EPICs: 3.4.0 to 3.4.5
For groov RIOs: 3.4.0 to 3.4.1

Resolved In Version:

For groov EPICs and groov RIOs: 3.5.0


Symptoms:

If you configured MQTT Sparkplug to use payload compression (on the MQTT Sparkplug configuration page, you select either GZip or Deflate for the Compression field), you may notice that tag updates are delayed or erratic. For example, if you use a tool to monitor tag states, you may notice that tags are unavailable or erratically switch states.

Workaround:

Disable payload compression:

  1. From the groov Manage Home page, click Data Services.
  2. Under the MQTT Sparkplug section, click MQTT Sparkplug Configuration.
  3. On the Compression field, click the currently selected value (either GZip or Deflate).
  4. Select None.
  5. Click Save. Confirm that you want to save this change and restart MQTT.

Resolution:

Opto 22 has resolved this issue.

Questions?

Contact: Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com


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