HiveMQ Edge OPC-UA: Data Flow Stops After Reconnect

Problem

Data stops flowing through HiveMQ Edge after an OPC-UA connection reconnect event. This issue can occur when the OPC-UA adapter experiences a disconnection and subsequent reconnection to the OPC-UA server, resulting in no data being published to MQTT topics despite the connection appearing to be re-established.

Affected Product

• Product: HiveMQ Edge

• Component: OPC-UA Protocol Adapter

• Resolved In: HiveMQ Edge 2025.12

Solution

Immediate Resolution

Upgrade to HiveMQ Edge version 2025.15 or later, which includes a fix for the OPC-UA reconnect issue where data stopped flowing.

Upgrade Steps

1. Download HiveMQ Edge 2025.15 from the official HiveMQ releases page

2. Stop your current HiveMQ Edge instance

3. Back up your existing configuration files

4. Replace the HiveMQ Edge binary with version 2025.15

5. Restart HiveMQ Edge

6. Verify that data flow resumes after OPC-UA reconnection events

Verification

After upgrading, verify the fix by:

1. Monitoring your OPC-UA adapter connections in the HiveMQ Edge web interface

2. Simulating a connection interruption to the OPC-UA server

3. Confirming that data flow resumes automatically after reconnection

4. Checking MQTT topic subscriptions to ensure messages are being published

Root Cause

This was a known bug in HiveMQ Edge versions prior to 2025.12 where the OPC-UA adapter failed to properly resume data collection and publishing after a reconnection event to the OPC-UA server.

Prevention and Best Practices

Version Management

• Keep HiveMQ Edge updated to the latest stable version to benefit from bug fixes and improvements

• Subscribe to HiveMQ release notifications to stay informed about critical updates

• Test new versions in a non-production environment before deploying to production

Additional Resources

• HiveMQ Edge 2025.15 Release Notes

• HiveMQ Edge Documentation

• HiveMQ Community Forum

• HiveMQ Support Portal