one virtual serial port with socat

Question

how to create just one virtual port with socat?

I want to test pyserial to read and write via one port

I'm already try :

socat -d -d pty,raw,echo=1 pty,raw,echo=1

it creates two virtual ports /dev/pts/9 and /dev/pts/10

when I'm try:

ser.write('test\n')

in another console, I'm try to read :

ser2.readline()

when timeout, pyserial read '\n' as '^J'

Answer 1

^J is the same as \n, see Wikiepdia. I cannot reproduce the blocking you experience:

$ socat -d -d pty,raw,echo=1 pty,raw,echo=1
2012/06/14 14:29:13 socat[28866] N PTY is /dev/pts/3
2012/06/14 14:29:13 socat[28866] N PTY is /dev/pts/5
2012/06/14 14:29:13 socat[28866] N starting data transfer loop with FDs [3,3] and [5,5]

Terminal 1:

>>> import serial
>>> s = serial.Serial('/dev/pts/5')
>>> s.readline()
'hello\r\n'
>>> s.readline()
'hello\n'

Terminal 2:

>>> import serial
>>> s = serial.Serial('/dev/pts/3')
>>> s.write('hello\r\n')
7
>>> s.write('hello\n')
6

The readline() calls return as soon as I execute write in the other terminal.