Hi. I followed this guide: http://wiki.openwrt.org/doc/recipes/3gdongle .
Router: TP-Link TL-WDR3600
Modem: Huawei E3276
Firmware: OpenWrt Attitude Adjustment 12.09
I installed packages listed in the guide.
I didn't have 'generic converter now attached' in dmesg, and no /dev/ttyUSB* devices.
In /sys/kernel/debug/usb/devices:
P: Vendor=12d1 ProdID=1506 Rev= 1.02
S: Manufacturer=HUAWEI Technology
I inserted to /etc/rc.local:
echo '12d1 1506 ff' > /sys/bus/usb-serial/drivers/option1/new_id
Now I have /dev/ttyUSB0 and /dev/ttyUSB1 .
I didn't have 'CD-ROM' message in dmesg, neither /dev/sg0 device, so I skipped the step usb-modeswitch.
In /etc/config/network I can't add option "option pincode 1234", because my ISP didn't give it to me. My SIM card doesn't ask for PIN.
/etc/config/network:
config interface 'wan'
option ifname ppp0
option device /dev/ttyUSB0
option apn internet
option service umts
option proto 3g
option username gdata
option password gdata
May 25 22:24:37 OpenWrt local2.info chat[7137]: abort on (BUSY)
May 25 22:24:37 OpenWrt local2.info chat[7137]: abort on (NO CARRIER)
May 25 22:24:37 OpenWrt local2.info chat[7137]: abort on (ERROR)
May 25 22:24:37 OpenWrt local2.info chat[7137]: report (CONNECT)
May 25 22:24:37 OpenWrt local2.info chat[7137]: timeout set to 10 seconds
May 25 22:24:37 OpenWrt local2.info chat[7137]: send (AT&F^M)
May 25 22:24:37 OpenWrt local2.info chat[7137]: expect (OK)
May 25 22:24:47 OpenWrt local2.info chat[7137]: alarm
May 25 22:24:47 OpenWrt local2.info chat[7137]: Failed
May 25 22:24:47 OpenWrt daemon.err pppd[7133]: Connect script failed
May 25 22:24:48 OpenWrt daemon.info pppd[7133]: Exit.
Also, `gcom info` fails:
root@OpenWrt:/etc/usb_modeswitch.d# gcom info -d /dev/ttyUSB0
##### Wireless WAN Modem Configuration #####
Product text:
====
====
Manufacturer: IMEI and Serial Number: comgt 22:28:36 -> -- Error Report --
comgt 22:28:36 -> ----> ^
comgt 22:28:36 -> Error @776, line 45, String is shorter than second argument. (7)
root@OpenWrt:/etc/usb_modeswitch.d# gcom info -d /dev/ttyUSB1
##### Wireless WAN Modem Configuration #####
Product text:
====
comgt 22:28:47 -> -- Error Report --
comgt 22:28:47 -> ----> ^
comgt 22:28:47 -> Error @187, line 10, Could not write to COM device. (1)