KB88763
Published: May 5, 2020
Revision: 3.0

MQTT topics not being published from OptoMMP device


Applies To:

Firmware for GRV-EPIC-PR1

Versions Affected:

1.5.0

Resolved In Version:

2.0.0


Symptoms:

If you observe either of the following:

  • MQTT had been publishing tags (in either a Sparkplug or string payload) from the GRV-EPIC-PR1’s I/O channels (when the MQTT Service’s device type is set as OptoMMP) and then stopped.
  • When you try to find public tags from an OptoMMP device, you can't find any.
Check for the following:
  • Was the I/O module on the chassis switched from an analog or discrete module to a serial or CAN module? (Switching between analog and discrete does not cause the previously mentioned symptoms.)
  • Is the control application configuring I/O on an OptoMMP device incorrectly (for example, mapping a channel incorrectly) or writing to a non-existent channel?

Workaround:

Review channel configurations to ensure that they map to appropriate I/O modules installed on the chassis and of the correct type.

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


DISCLAIMER

This Opto 22 Knowledge Base ('OptoKB') article is intended to provide general technical information on a particular subject or subjects and is not an exhaustive treatment of such subjects. Accordingly, the information in this OptoKB article is not intended to constitute application, design, software, or other professional engineering advice or services. Opto 22 may modify the OptoKB articles at any time. Before making any decision or taking any action which might affect your equipment, you should consult a qualified professional.

OPTO 22 DOES NOT WARRANT THE COMPLETENESS, TIMELINESS, OR ACCURACY OF THE DATA CONTAINED IN THIS OPTOKB ARTICLE AND MAY MAKE CHANGES THERETO AT ANY TIME AT ITS SOLE DISCRETION WITHOUT NOTICE. FURTHER, ALL INFORMATION CONVEYED HEREBY IS PROVIDED TO USERS 'AS IS.' IN NO EVENT SHALL OPTO 22 BE LIABLE FOR ANY DAMAGES OF ANY KIND INCLUDING DIRECT, INDIRECT INCIDENTAL, CONSEQUENTIAL, LOSS PROFIT, OR DAMAGE, EVEN IF OPTO 22 HAS BEEN ADVISED ON THE POSSIBILITY OF SUCH DAMAGES.

OPTO 22 DISCLAIMS ALL WARRANTIES WHETHER EXPRESSED OR IMPLIED WITH RESPECT TO THE INFORMATION (INCLUDING HARDWARE, SOFTWARE, AND/OR FIRMWARE) PROVIDED HEREBY, INCLUDING THE IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE, MERCHANTIBILITY, AND NON-INFRINGEMENT. Note that certain jurisdictions do not sanction the exclusion of implied warranties: thus, this disclaimer may not apply to you.

Copyright © 2020 Opto 22. All rights reserved.