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Modbus/TCP limited to single unit #131

@tkuusk

Description

@tkuusk

OpenPLC runtime fails to start if there are multiple Modbus slaves behind a single gateway with message:

[ERROR] [MODBUS_MASTER] Error starting main loop: Duplicate host:port combinations found for TCP devices. Each TCP device must have a unique host:port combination.

There is an identical issue reported against OpenPLC Editor: Autonomy-Logic/openplc-editor#695

Runtime version: 4.0.9

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