## Contents * [1 Introduction](#Introduction) * [2 Prepare device](#Prepare_device) * [2.1 Switch into modem mode](#Switch_into_modem_mode) * [2.2 Driver loading](#Driver_loading) * [2.3 Optional: device naming](#Optional:_device_naming) * [3 Connecting internet](#Connecting_internet) * [4 AT commands](#AT_commands) * [5 Sending SMS](#Sending_SMS) * [6 USSD Requests](#USSD_Requests) * [7 Success Stories](#Success_Stories) * [8 References](#References) ## Introduction This article describes how to configure Huawei E1550 3G modems. This modem is generic modem device, but there are two kludges: * you need to switch it into modem mode * you need to load proper driver (usbserial) ## Prepare device ### Switch into modem mode By default kernel recongnizes it as usb-storage device (SCSI CD-ROM). It is true, because of this modem contains MicroSD card (up to 4Gb) reader and internal flash. To switch modem on you shoud run ``` $ /lib/udev/usb_modeswitch --vendor 0x12d1 --product 0x1446 --type option-zerocd ``` command. See also the [usb_modeswitch](https://www.archlinux.org/packages/?name=usb_modeswitch) package, which you may need in future since in udev-157 modem-modeswitch has been renamed and changed as described in the [commit](http://git.kernel.org/?p=linux/hotplug/udev.git;a=commit;h=4dd9b291354e76f34b0d6d7b5c3b28d03a624418). This package does not need any modifications, just install it. Also you can create udev's config: /etc/udev/rules.d/15-huawei-e1550.rules ``` ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1446", RUN+="/lib/udev/usb_modeswitch --vendor 0x12d1 --product 0x1446 --type option-zerocd" ``` After that, modem changes its USB IDs to 12d1:140c and /proc/bus/usb/devices shows new USB endpoints. ### Driver loading usbserial is proper driver for this modem, but probably it does not recognize it, so you shold force it, passing USB IDs. ``` # modprobe usbserial vendor=0x12d1 product=0x140c ``` or put options into /etc/modprobe.d/modprobe.conf ``` options usbserial vendor=0x12d1 product=0x140c ``` (do not forget to 'rmmod usbserial' if it is already loaded before) ### Optional: device naming You can generate symlinks to the ttyUSB* ports for a more human readable configuration with udev rules. For a Huawei device which identifies with the USB ID 12D1:1001 after modeswitching and has 3 serial ports: ``` SUBSYSTEMS=="usb", ATTRS{modalias}=="usb:v12D1p1001*", KERNEL=="ttyUSB*", ATTRS{bInterfaceNumber}=="00", ATTRS{bInterfaceProtocol}=="ff", SYMLINK+="ttyUSB_utps_modem" SUBSYSTEMS=="usb", ATTRS{modalias}=="usb:v12D1p1001*", KERNEL=="ttyUSB*", ATTRS{bInterfaceNumber}=="01", ATTRS{bInterfaceProtocol}=="ff", SYMLINK+="ttyUSB_utps_diag" SUBSYSTEMS=="usb", ATTRS{modalias}=="usb:v12D1p1001*", KERNEL=="ttyUSB*", ATTRS{bInterfaceNumber}=="02", ATTRS{bInterfaceProtocol}=="ff", SYMLINK+="ttyUSB_utps_pcui" ``` For a Huawei device which identifies with the USB ID 12D1:1003 after modeswitching and has 2 serial ports: ``` SUBSYSTEMS=="usb", ATTRS{modalias}=="usb:v12D1p1003*", KERNEL=="ttyUSB*", ATTRS{bInterfaceNumber}=="00", ATTRS{bInterfaceProtocol}=="ff", SYMLINK+="ttyUSB_utps_modem" SUBSYSTEMS=="usb", ATTRS{modalias}=="usb:v12D1p1003*", KERNEL=="ttyUSB*", ATTRS{bInterfaceNumber}=="01", ATTRS{bInterfaceProtocol}=="ff", SYMLINK+="ttyUSB_utps_pcui" ``` ## Connecting internet Now you have new 2 or 3 /dev/ttyUSB* devices.Most likely first of them (ttyUSB0 if you had not such devices before) is PPP compatible modem. Use it as usual with pppd, kppp, gnome-ppp, network-manager, etc. **Note:** If you want to use your 3G modem with [NetworkManager](/index.php/NetworkManager "NetworkManager"), you have to install the package [modemmanager](https://www.archlinux.org/packages/?name=modemmanager) and then [restart](/index.php/Restart "Restart") the `NetworkManager.service`. Now you can 'Enable Mobile Broadband' in the networkmanager applet. ## AT commands There are some useful commands: * AT^U2DIAG=0 - the device is only Modem * AT^U2DIAG=1 - device is in modem mode + CD ROM * AT^U2DIAG=255 - the device in modem mode + CD ROM + Card Reader * AT^U2DIAG=256 - the device in modem mode + Card Reader * AT+CPIN= - enter PIN-code * AT+CUSD=1,,15 - USSD request, result can be found (probably) in /dev/ttyUSB2. Encode "*100#" to PDU format: ``` perl -e '@a=split(//,unpack("b*","*100#")); for ($i=7; $i < $#a; $i+=8) { $a[$i]="" } print uc(unpack("H*", pack("b*", join("", @a))))." "' ``` Decode "AA180C3602" from PDU format: ``` perl -e '@a=split(//,unpack("b*", pack("H*","AA180C3602"))); for ($i=6; $i < $#a; $i+=7) {$a[$i].="0" } print pack("b*", join("", @a)).""' ``` Answer decoding (this example is balance response: 151.25): ``` perl -e 'print pack("H*", "003100350031002C003200350020044004430431002E0020");' ``` Some operators return USSD result in PDU encoding, so you should check proper decoding method. * AT+CSQ - get signal quality (AT+CSQ=?) * AT+GMI - get manufacturer * AT+GMM - get model * AT+GMR - get revision * AT+GMN - get IMEI * AT+COPS? - get operator info * AT^CARDLOCK="NCK-code" - unlock modem. NCK-code should be calculated by IMEI. After that modem can work with any GSM-provider. * AT^SYSCFG=mode, order, band, roaming, domain - System Config Mode: * 2 Automatic search * 13 2G ONLY * 14 3G ONLY * 16 No change Order: * 0 Automatic search * 1 2G first, then 3G * 2 3G first, then 2G * 3 No change Band: * 80 GSM DCS systems * 100 Extended GSM 900 * 200 Primary GSM 900 * 200000 GSM PCS * 400000 WCDMA IMT 2000 * 3FFFFFFF Any band * 40000000 No change of band Roaming: * 0 Not supported * 1 Roaming is supported * 2 No change Domain: * 0 CS_ONLY * 1 PS_ONLY * 2 CS_PS * 3 ANY * 4 No change ## Sending SMS You can use gammu. Edit ~/.gammurc ``` [gammu] port=/dev/ttyUSB0 connection=at name=huawei e1550 model= ``` The run command: ``` gammu sendsms TEXT +7123456789 -text qwe ``` ## USSD Requests Use [huawei-ussd](https://aur.archlinux.org/packages/huawei-ussd/) package. Or use [ussd.php](https://github.com/gnomeby/ussd) tool. ## Success Stories 2010-August-03: I didn't do anything, I just installed usb_modeswitch-1.1.3-2 and my kernel is 2.6.33\. In the syslog (/var/log/messages.log) the usb_modeswitch can automatically configure the modem correctly but I still cannot connect to the internet using gnome network manager applet, then I installed the modemmanager package and restart the networkmanager service. Everything is working properly now. ## References * [USB 3G Modem](/index.php/USB_3G_Modem "USB 3G Modem") * [Huawei E220](/index.php/Huawei_E220 "Huawei E220")