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On Wireshark am definitely a newbie here but selecting my ethernet adapter there is definitely traffic: Server = ModbusServer(host=args.host, port=args.port, data_hdl=MyDataHandler()) Parser.add_argument('-H', '-host', type=str, default='localhost', help='Host (default: localhost)') Return super().write_h_regs(address, words_l, srv_info) Return super().write_coils(address, bits_l, srv_info)ĭef write_h_regs(self, address, words_l, srv_info): Return super().read_i_regs(address, count, srv_info)ĭef write_coils(self, address, bits_l, srv_info): Return super().read_h_regs(address, count, srv_info)ĭef read_i_regs(self, address, count, srv_info): Return super().read_d_inputs(address, count, srv_info)ĭef read_h_regs(self, address, count, srv_info): Return DataHandler.Return(exp_code=EXP_ILLEGAL_FUNCTION)ĭef read_d_inputs(self, address, count, srv_info): Return super().read_coils(address, count, srv_info) # read 10 bits (= coils) at address 0, store result in coils listįrom rver import ModbusServer, DataHandlerįrom nstants import EXP_ILLEGAL_FUNCTIONĪLLOW_R_L = ĭef read_coils(self, address, count, srv_info): Pip install the package and this code will work:Ĭlient.py from pyModbusTCP.client import ModbusClient These two scripts are from the examples of the pyModbusTCP repo I am just running them locally on my Windows 10 machine to see if I can view the traffic on Wireshark. Can a Modbus client and server both run localhost on the same computer listening on the same TCP port 502? Or would they have to be on separate machines?Īll running local host a client and server scripts based on pyModbusTCP which is surprisingly easy getting this up and working on Python 3.9 Windows 10. I am tinkering with some modbus python scripts to try and learn it but I cant seem to capture traffic on wireshark.