First you need to get a root shell in the device as the commands need to be executed as root.
Once this is done you need to switch the USB connector to the modem USB. This can be done with the following command:
echo MODEM > /sys/devices/virtual/sec/switch/usb_sel
Then nothing will happen, you will still be able to login through adb.
To make the device switch to the modem USB you then need to unplug and replug the USB cable between your computer and the device.
At this point, if the modem was booted, you'll see a new USB device appearing.
Some serial ports will also appear.
Tested on Replicant 6.0 0004 RC3
| Device | Distribution | Modem status | USB ids | tty |
| GT-I9100 | Replicant 6.0 0004 RC3 | Booted | TODO | /dev/ttyACM0 -> /dev/ttyACM6 |
| GT-I9100 | Replicant 6.0 0004 RC3 | Off | None | N/A |
| GT-I9300 | Replicant 6.0 0004 RC3 | Booted | 1519:0020 Comneon HSIC Device | /dev/ttyACM0 -> /dev/ttyACM6 |
# picocom /dev/ttyACM0 picocom v3.1 port is : /dev/ttyACM0 flowcontrol : none baudrate is : 9600 parity is : none databits are : 8 stopbits are : 1 escape is : C-a local echo is : no noinit is : no noreset is : no hangup is : no nolock is : no send_cmd is : sz -vv receive_cmd is : rz -vv -E imap is : omap is : emap is : crcrlf,delbs, logfile is : none initstring : none exit_after is : not set exit is : no Type [C-a] [C-h] to see available commands Terminal ready AT+TRACE=1 OK AT+CLAC ATS ATD ATA ATO ATE ATH ATV ATZ ATl ATm ATQ ATX AT&F AT&D AT&C AT\Q AT+CGSMS AT+CMGD AT+CMGF AT+CMGL AT+CMGR AT+CMGS AT+CMGW AT+CMMS AT+CMSS AT+CNMA AT+CNMI AT+CPMS AT+CSCA AT+CSCB AT+CSMS AT+XCSSMS AT+XSMS AT+XTESM AT+CSDH AT+CSAS AT+CRES AT+CMGC AT+CSMP AT+CGREG AT+COPN AT+COPS AT+CREG AT+CSQ AT+XBANDSEL AT+XCOPS AT+XCSPAGING AT+XEONS AT+XREG AT+XAACOPS AT+XUBANDSEL AT+XRAT AT+CPLS AT+CPOL AT+XHOMEZR AT+CHUP AT+CMOD AT+CTFR AT+VTS AT+XCALLSTAT AT+XDTMF AT+XVTS AT+CSTA AT+CVHU AT+VTD AT+CCWE AT+CR AT+CRC AT+XPROGRESS AT+XREDIAL AT+CAOC AT+XLIN AT+CCFC AT+CCWA AT+CHLD AT+CLCC AT+CLCK AT+CLIP AT+CLIR AT+CNAP AT+COLP AT+COLR AT+CPWD AT+CSSN AT+CUSD AT+CCUG AT+CBST AT+CEER AT+CGACT AT+CGATT AT+CGAUTO AT+CGCLASS AT+CGCMOD AT+CGDATA AT+CGDCONT AT+CGDSCONT AT+CGEQMIN AT+CGEQNEG AT+CGEQREQ AT+CGEREP AT+CGPADDR AT+CGQMIN AT+CGQREQ AT+CGTFT AT+XCGCLASS AT+XDNS AT+XGAUTH AT+FCLASS AT+CRLP AT+XNVMPLMN AT+XNVMMCC AT+CBC AT+CCID AT+CCLK AT+CFUN AT+CGMI AT+CGMM AT+CGMR AT+CGSN AT+CIMI AT+CMEE AT+CMUX AT+CNUM AT+CPIN AT+CPWROFF AT+CRSM AT+CSCS AT+CSIM AT+CSVM AT+CTZR AT+CTZU AT+IPR AT+XCTMS AT+XGENDATA AT+XPINCNT AT+XLOG AT+XMER AT+XSIMSTATE AT+TRACE AT+XL1SET AT+XSIO AT+XDLCTEST AT+XPOW AT+XCEER AT+XEER AT+XTRACECONFIG AT+XMUX AT+XFDOR AT+XFDORT AT+XCONFIG AT+XAPP AT+XHSDUPA AT+CPIN2 AT+XDATACHANNEL AT+CONNECTPORT AT+CAMM AT+CACM AT+CCHO AT+CCHC AT+XCSP AT+NEER AT+CUAD AT+XUICC AT+XLEMA AT+XSYSTRACE AT+CLAC AT+CPUC AT+CLAN AT+CGLA AT+CRLA AT+CPAS AT+XSVM AT+XNOTIFYDUNSTATUS AT+XRXDIV AT+XSETCAUSE OK
Xgoldmon seem to display things on the GT-I9100:
# ./xgoldmon -vvvv -i localhost -t s2 -l /dev/ttyACM1 LOG:>>[HIGH]oembatt.c,310,[DISP] Thermistor : measured_value=1630666778<< LOG:>>[HIGH]oembatt.c,137,[DISP] oem_set_batt_level : 4220<< LOG:>>[HIGH]oembatt.c,236,[DISP] BATT : measured_value_mv=4220, AvgBattVal_mv=4007, battery_level=5<< LOG:>>[LOW]oemdisplay.c,363,no change -> rssi:4, bat:5<< LOG:>>[HIGH]oembatt.c,310,[DISP] Thermistor : measured_value=1630666779<< LOG:>>[HIGH]oembatt.c,137,[DISP] oem_set_batt_level : 4225<< LOG:>>[HIGH]oembatt.c,236,[DISP] BATT : measured_value_mv=4225, AvgBattVal_mv=4026, battery_level=5<< LOG:>>[LOW]oemdisplay.c,363,no change -> rssi:4, bat:5<< LOG:>>[HIGH]oembatt.c,310,[DISP] Thermistor : measured_value=1630666778<< LOG:>>[HIGH]oembatt.c,137,[DISP] oem_set_batt_level : 4220<< LOG:>>[HIGH]oembatt.c,236,[DISP] BATT : measured_value_mv=4220, AvgBattVal_mv=4055, battery_level=5<< LOG:>>[LOW]oemdisplay.c,363,no change -> rssi:4, bat:5<<
And when calling an (inexisting/invalid) number, the frames appear in Wireshark.
# picocom /dev/ttyACM0 picocom v3.1 port is : /dev/ttyACM0 flowcontrol : none baudrate is : 9600 parity is : none databits are : 8 stopbits are : 1 escape is : C-a local echo is : no noinit is : no noreset is : no hangup is : no nolock is : no send_cmd is : sz -vv receive_cmd is : rz -vv -E imap is : omap is : emap is : crcrlf,delbs, logfile is : none initstring : none exit_after is : not set exit is : no Type [C-a] [C-h] to see available commands Terminal ready AT+TRACE=1 OK AT OK AT+CLAC ATS ATD ATA ATO ATE ATH ATV ATZ ATl ATm ATQ ATX AT&F AT&D AT&C AT\Q AT+CGSMS AT+CMGD AT+CMGF AT+CMGL AT+CMGR AT+CMGS AT+CMGW AT+CMMS AT+CMSS AT+CNMA AT+CNMI AT+CPMS AT+CSCA AT+CSCB AT+CSMS AT+XCSSMS AT+XSMS AT+XTESM AT+CSDH AT+CSAS AT+CRES AT+CMGC AT+CSMP AT+CGREG AT+COPN AT+COPS AT+CREG AT+CSQ AT+XBANDSEL AT+XCOPS AT+XCSPAGING AT+XEONS AT+XREG AT+XAACOPS AT+XUBANDSEL AT+XRAT AT+CPLS AT+CPOL AT+XHOMEZR AT+XCSQ AT+CHUP AT+CMOD AT+CMUT AT+CTFR AT+VTS AT+XCALLSTAT AT+XDTMF AT+XVTS AT+CSTA AT+CVHU AT+VTD AT+CCWE AT+CR AT+CRC AT+XPROGRESS AT+XREDIAL AT+CAOC AT+XLIN AT+CCFC AT+CCWA AT+CHLD AT+CLCC AT+CLCK AT+CLIP AT+CLIR AT+CNAP AT+COLP AT+COLR AT+CPWD AT+CSSN AT+CUSD AT+CCUG AT+CBST AT+CEER AT+CGACT AT+CGANS AT+CGATT AT+CGAUTO AT+CGCLASS AT+CGCMOD AT+CGDATA AT+CGDCONT AT+CGDSCONT AT+CGEQMIN AT+CGEQNEG AT+CGEQREQ AT+CGEREP AT+CGPADDR AT+CGQMIN AT+CGQREQ AT+CGTFT AT+XCGCLASS AT+XDNS AT+XGAUTH AT+FCLASS AT+CRLP AT+XNVMPLMN AT+XNVMMCC AT+CBC AT+CCID AT+CCLK AT+CFUN AT+CGMI AT+CGMM AT+CGMR AT+CGSN AT+GSN AT+CIMI AT+CMEE AT+CMUX AT+CNUM AT+CPIN AT+CPWROFF AT+CRSM AT+CSCS AT+CSIM AT+CSVM AT+CTZR AT+CTZU AT+IPR AT+XCTMS AT+XGENDATA AT+XPINCNT AT+XLOG AT+XMER AT+XSIMSTATE AT+TRACE AT+XL1SET AT+XSIO AT+XDLCTEST AT+XPOW AT+XCEER AT+XEER AT+XTRACECONFIG AT+XMUX AT+XFDOR AT+XFDORT AT+XCONFIG AT+XAPP AT+XHSDUPA AT+XCAP AT+CPIN2 AT+XDATACHANNEL AT+CONNECTPORT AT+CAMM AT+CACM AT+CCHO AT+CCHC AT+XCSP AT+NEER AT+CUAD AT+XUICC AT+XLEMA AT+XSYSTRACE AT+CLAC AT+CPUC AT+CLAN AT+CGLA AT+CRLA AT+CPAS AT+XSVM AT+XNOTIFYDUNSTATUS AT+XRXDIV AT+XRXDIV3GRAB AT+XMAGETKEY AT+XMAGETBLOCK AT+CPOS AT+CPOSR AT+CMOLR AT+CMTLR AT+CMTLRA AT+XCPOSR AT+XSETCAUSE AT+XSPEECHINFO OK