I’m using these devices on embedded linux, when i load the drivers I get three ttyUSBs 0 1 2.
One corresponds to the AT command interface, one corresponds to GPS data, and I cant work out what the final one is for.
My questions are as follows:
1.) What is the third tty for?
Secondly, ive been able to get a data connection using ppp on the AT command interface, however, once ppp
is up, i can no longer issue AT commands. On other sierra wireless modems, i’ve been able to use one tty with
ppp and another to issue AT commands.
2.) Is there a way to enter AT commands without interrupting PPP on the MC7304 and MC7355? Is it possible to configure the modules to run ppp on one tty and issue AT commands on another?
Thanks for any help.