Welcome to the forum, please find my comment below:
AT!CUSTOM=“STKUIEN”,1
This command is level 2, you need to enter unlock code first (!ENTERCND), check with your distribator for info.
However, it only takes care SIM Tool kit feature, nothing to deal with CnS.
To get firmware info, try:
7e 00 0a 2b 00 00 01 01 00 00 00 00 02 00 00 7e
I though maybe it was needed because the parameters says:
0 = Disable
1 = Enable for CnS interface (AT disabled) <–
2 = Enable for AT interface (CnS disabled)
But certainly is for SIM Toolkit. I will contact my distributor anyway.
2-3) I tried the command but still give me no response. I will check better my code and check the documentation again.
Is there some configuration or condition in order to begin to send CnS commands? I need to open ttyUSB0 port right? (The first of the Sierra USB modem converter)
Thank you again
------------ Edit ----------
I checked my code and I was reading my answer wrong! … Now I see the response.