[BUG] Suddenly Connector implementation not found for OPC UA

[hoffi085]

Connector name (If bug in the some connector):
OPC-UA Connector

Describe the bug
Suddenly we receive following error logs:

Mär 16 12:20:07 thingsboard-iot-gateway python3[4069]: OPC-UA library not found
Mär 16 12:20:07 thingsboard-iot-gateway python3[4069]: 2026-03-16 12:20:07.504 - |INFO| - [tb_loader.py] - tb_loader - import_module - 78 - No module named 'pkg_resources'
Mär 16 12:20:07 thingsboard-iot-gateway python3[4069]: 2026-03-16 12:20:07.505 - |INFO| - [tb_loader.py] - tb_loader - import_module - 78 - No module named 'asyncua'
Mär 16 12:20:07 thingsboard-iot-gateway python3[4069]: 2026-03-16 12:20:07.505 - |WARNING| - [tb_gateway_service.py] - tb_gateway_service - _load_connectors - 902 - Connector implementation not found for OPC_HBA_S03
Mär 16 12:20:07 thingsboard-iot-gateway python3[4069]: 2026-03-16 12:20:07.505 - |ERROR| - [tb_gateway_service.py] - tb_gateway_service - _load_connectors - 905 - The following error occurred during importing connector class: No module named 'asyncua'
Mär 16 12:20:07 thingsboard-iot-gateway python3[4069]: NoneType: None
Mär 16 12:20:07 thingsboard-iot-gateway python3[4069]: 2026-03-16 12:20:07.505 - |ERROR| - [tb_gateway_service.py] - tb_gateway_service - _load_connectors - 905 - The following error occurred during importing connector class: No module named 'pkg_resources'
Mär 16 12:20:07 thingsboard-iot-gateway python3[4069]: NoneType: None
Mär 16 12:20:07 thingsboard-iot-gateway python3[4069]: 2026-03-16 12:20:07.505 - |ERROR| - [tb_gateway_service.py] - tb_gateway_service - _load_connectors - 905 - The following error occurred during importing connector class: No module named 'asyncua'
Mär 16 12:20:07 thingsboard-iot-gateway python3[4069]: NoneType: None
Mär 16 12:20:07 thingsboard-iot-gateway python3[4069]: 2026-03-16 12:20:07.505 - |INFO| - [tb_loader.py] - tb_loader - import_module - 78 - No module named 'asyncua'

OPC UA Connection therefore does not start anymore.
We tried to deactivate the connector and restart thingsboard-iot-gateway as described here with no luck.

Versions (please complete the following information):

• OS: Debian 6.1.158-1
• Thingsboard IoT Gateway version 3.8.2
• Python version 3.11.2

[samson0v]

Hi @hoffi085, thanks for your interest in ThingsBoard IoT Gateway!
This bug was fixed, and the next version of the Gateway will run as expected (release planned on 26 March).

We are really sorry for this situation. As a workaround, you can use the version from the master branch or build a deb package by yourself.