How to make a serial port sniffer sniffing physical port using a python -


i have pc software (os: win 64bit) communicates machine via physical serial port rs232 , want make sniffer port using python. please note beginner serial ports.

i've read multiple documents , questions posted online of them asks use 3rd-party software, cannot way because raw bytes have decoded string message (i have way own of decode/encode method).

currently have setup this:

///////////////////       physical com1        ///////////// // (pc) software // <------------------------> // machine // ///////////////////                            /////////////

and want python output bytes went through com1.

desired behavior diagram (virtual serial port has question mark because i'm not sure if right approach):

///////////////////       physical com1        ///////////// // (pc) software // <------------------------> // machine // ///////////////////            | virtual       /////////////                                | serial port?                                v                         //////////////////                         // (pc) sniffer // (python)                         //////////////////                                |                                 v                          (output bytes)

those of knows advanced serial port monitor, "spymode" functionality trying achieve using python.

i've tried use com0com , portmon can't find way configure com0com sniff physical port (as far observation goes, com0com makes virtual ports) , portmon not support windows 64-bit.

i've been stuck @ days... comments/links/answers appreciated. thank you,

you should go through pyserial

only 1 function can acquire serial port @ time.

for one-way communication(from machine pc software), way can think of sniff serial port read port1 , write port2, machine writing port1 , pc software has been modified read port2.

import serial  baud_rate = 4800 #whatever baudrate listening com_port1 = '/dev/tty1' #replace com port path com_port1 = '/dev/tty2'  listener = serial.serial(com_port1, baudrate) forwarder = serial.serial(com_port2, baudrate)  while 1:     serial_out = listener.read(size=1)     print serial_out #or write file      forwarder.write(serial_out)

to achieve full duplex(asynchronous 2 way communication), you need have 2 processes, 1 each direction. need synchronize these process in way. 1 way be, while 1 process reads port1, other writes port2, , vice-versa. read question


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