get TCP data frame in modbusTCPMaster

[hobik]

I want to get, TCP data frame between some modbus tcp proccess,
For example when I want to read holding register 1 to 5, I want to get all TCP frame,

modbus-tk/modbus_tk/modbus_tcp.py

Line 216 in 14c70f2

rcv_byte = self._sock.recv(1)

When I try to check this line,rcv_byte = self._sock.recv(1) with print(recv_byte) I get just PDU unit. How can I access the TCP frame while receiving data between these processes?