Here is what you need to know about this modem. Like most modems, it responds to AT commands. Thus, the first thing to do is make sure that the kernel sees the modem driver correctly.

• # modinfo sierra you should see v.1.7.x or later

• # modinfo sierra_net you should see v.1.xx or later

• # ls /dev/ttyUSB* you should see: /dev/ttyUSB0 /dev/ttyUSB1 /dev/ttyUSB2 /dev/ttyUSB3

• # ifconfig you should see a WWAN without ip address.

• # minicom –s you should see 115200-8N1 : 115200 bps and 8 bits none parity, 1 stop bit.

I got a real feeling of nostalgia and fondly remembered the BBS when doing this. I did not need to enable echo: its ATE1, so if you don't see what you are typing, just type 'ATE1 <enter>' and it should respond let you see what you are typing.

The next thing you need to do is know your APN and additional details. For the AT&T starter kit, you will use this: m2m.com.attz

For regular retail SIMs: broadband.# minicom -s AT #

Verify the thing is ON. This should return OK.

at!gstatus? should return device status.

Ok, now you are good to set your APN into the modem.

at+cfun=1 
at+cgdcont=3,"IP","CustomAPN"
at!scdftprof=3
at!scprof=3," ",1,0,0,0

At the end of this, the modem should be connected.

Check the IP address that the modem has at!scpaddr=3 and it should display the real life address. Now, you face the next challenge: how to exit Minicom. Ctrl-A and X worked for me.

ifconfig the interface should have the IP address. How to test it without losing the terminal? ping -I wwan0 8.8.8.8

If it's pinging its on.

CODE

SET MODEM TYPE NONE
SET LINE /dev/ttyUSB2
SET CARRIER-WATCH OFF
lineout at+cfun=1
input 5 OK
if fail exit 1 First AT failed
echo First AT went OK
quit