KB89859
Published: August 17, 2021
Revision: 2.0

MQTT OptoMMP device status is erratic


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

Versions Affected:

groov EPICs: 2.0.0 to 3.2.1
groov RIOs: 2.2.0 to current

Resolved In Version:

groov EPICs: 3.2.2


Symptoms:

When using an MQTT OptoMMP device (configured in groov Manage), you may experience the following symptoms:

  • For MQTT Sparkplug payloads, the OptoMMP device’s status goes offline and then comes back online.
  • For MQTT String payloads, MQTT may unexpectedly publish all tags. (This behavior is typically the first operation upon a device connection.)
If you review the MQTT logs in groov Manage (from the groov Manage Home page, click Info and Help > Logs > MQTT), you may see messages like the following:

ERROR|2021-07-28 09:42:56,164|OptoMmpScanner.java|407|Scanning threw error OptoMMP read response length mismatch accessing 0xfffff1008c00 response contains 32704 bytes, expected 1024 bytes.

The text in bold ("Scanning threw error") indicates that you may have this issue.

Resolution:

Opto 22 has resolved this issue and will include the fix in an upcoming release.

Questions?

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


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