[BUG] Polling of Tag value gets stoped after Session keep Alive failure error for a device in OPCUA

[Kiruthick-Roxx]

Description
When the OPC UA session encounters a "Keep Alive" failure, subsequent attempts to update tags fail. This issue persists even after the session is reconnected, causing disruptions in data synchronization.

Steps to Reproduce

• Establish an OPC UA session and start updating tags.
• Simulate a "Keep Alive" failure by disrupting the network or server connection (atleast more than a hour).
• Reconnect the session after the failure.
• Attempt to update tags.
• Expected Behavior:
• Tag updates should resume normally after the session is reconnected.

Actual Behavior
Tag updates fail even after the session is reconnected, requiring a complete restart of the server to restore functionality.

Environment

• FUXA version: V.1.2.3-2105
• Node.js version: 18.20
• npm version: 10.9.0
• Platform/OS: Ubuntu 20.04
• Browser: Chrome

[unocelli]

Hi, have you try to investigate how to solve the issue?

[Kiruthick-Roxx]

Hi @unocelli ,
Once this error occurs, it does not come out this error and gets stuck in a loop, even though when the device is powered up again and communicate. The solution that worked for me it restart FUXA server or disable that particular device and enable it again.

I think a good solution would be to check for a number of session keepalive failure (say 10) and then disconnect the session and reconnect it, also create a toaster for the same as this also accounts for device connection failure.