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Add feature Modbus RTU over TCP #93

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Add feature Modbus RTU over TCP #93

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23 changes: 23 additions & 0 deletions umodbus/client/serial/rtu.py
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Original file line number Diff line number Diff line change
Expand Up @@ -223,3 +223,26 @@ def send_message(adu, serial_port):
serial_port.read, expected_response_size - exception_adu_size)

return parse_response_adu(response_error_adu + response_remainder, adu)


def send_message_over_tcp(adu, sock):
""" Send ADU over tcp to server and return parsed response.

:param adu: Request ADU.
:param sock: Sock instance.
:return: Parsed response from server.
"""
sock.sendall(adu)

# Check exception ADU (which is shorter than all other responses) first.
exception_adu_size = 5
response_error_adu = recv_exactly(sock.recv, exception_adu_size)
raise_for_exception_adu(response_error_adu)

expected_response_size = \
expected_response_pdu_size_from_request_pdu(adu[1:-2]) + 3
response_remainder = recv_exactly(
sock.recv, expected_response_size - exception_adu_size)

return parse_response_adu(response_error_adu + response_remainder, adu)