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Hello,

I try your code for a project where I need to mux my GSM serial line.
When I run cmux, it create 4 tty : ttyGSM1 to 4.
But I can't use them.

With python I do :
import serial
com=serial.Serial('/dev/ttyGSM1',115200)

and I have the following error :
Traceback (most recent call last):
File "", line 1, in
File "/usr/lib/python2.7/site-packages/serial/serialutil.py", line 171, in init
self.open()
File "/usr/lib/python2.7/site-packages/serial/serialposix.py", line 179, in open
raise SerialException("could not open port %s: %s" % (self._port, msg))
serial.serialutil.SerialException: could not open port /dev/ttyGSM1: [Errno 51] Level 2 halted: '/dev/ttyGSM1'

Do you have any idea ?

Many thanks

Hello:

I try to use cmux in my atmel board ( linux 4.4.4) , cross compile cmux and run successful.
It created 4 virtual tty for me. /dev/ttyGSM1 ~ /dev/ttyGSM4.

When i write data to /dev/ttyGSM1 by using shell, like this: printf "at\r\n" > /dev/ttyGSM1 ,data was sent successful, using salease logic analyze tool, can see the GPRS module responds with OK using GPRS0710 protocol.

But when i using microcom (linux serial port tools in busybox, like minicom) in command line:
microcom -s 115200 /dev/ttyGSM1, After that, microcom seems dead ! microcom cannot send/read anything, and I cannot close microcom by using CTRL+C.

I do not know who cause this problem, cmux,GPRS module or linux kernel ? or microcom ?
can you help me to solve this problem? Thanks!

when module reset , the UART will not quit and the ttyGSM is residue , so can not rebuild the new ttyGSM.
please help me and tell me how to quit cmux, thank you