Alexander Polleti

previously the test would succeed if one byte was non zero. But the whole ID need to be 0. Closes #507

Modbus TCP Protocol identifier should be 0

1

https://github.com/stephane/libmodbus/blob/f1eb4bc7ccb09cd8d19ab641ee37637f8c34d16d/src/modbus-tcp.c#L202 shouldn't there be an || instead of an &&?