Hi Erichere without this fix, ppp gets blocked during init.
My GE863-Pro^3 works well without it, however, without it the control
signals from the computer side do not seem to work correctly.
I get the exact same byte sequence as you do.From my tests, without the patch, the value in modem_tx will neverchange when we send TIOCMSET commands.
By the way, can you confirm if your Telit modems respect the EA bit on
the MSC frame ?