Fixed MODBUS_ERROR_RECOVERY_LINK not working on Windows. #644
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Fixes issue #643
Otherwise, I don't like how error recovery is coded : if we want to break the loop (e.g. to close the program), we need to disable the error recovery from another thread but it is not a good idea to use the context on many threads. It is best to use a finite number of attempts to ensure that the function does not loop indefinitely. Or just remove the do-while loop !