Modbus addon not work at openhab2.3.0

I think so too. In the past I have used 2.3 snapshot bindings with 2.2 stable.

Or you can just download one specific binding from Jfrog and drop it in your addons folder.

https://openhab.jfrog.io/openhab/online-repo-snapshot/2.4/org/openhab/binding/org.openhab.binding.modbus/2.4.0-SNAPSHOT/

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