Hi Kiran,

 > Kiran: I am facing problem while reading from the file descriptor I 
got from modem.request(). One observation is, I get
> "modem=/dev/ttyACM0 aux=/dev/ttyACM3 gps=/dev/ttyACM5" from ofonod logs, but /dev/ttyACM5 is not accepting AT commands when I try from minicom.
> Should I change gps port also to /dev/ttyACM3?

I'm not familiar with how GPS is setup on the he910.  From what I 
remember it is a dedicated port that is activated using $GPS* related 
commands.

The port must be dedicated (so not /dev/ttyACM3) since the file 
descriptor is being passed to an untrusted client.

Regards,
-Denis