I am trying to have two modems working at the same time with ofono : one is the Telit HE910, and the other one is the Option GTM382. Both of them work fine when plugged alone, but if I use them both at the same time,the initialization seems to stop during the telit_enable phase. I am using ofono-1.3, I applied the several patches released in the meantime to support the Telit modems including the latest series patches "Telit plugin rework for HE910". Here is the debug log from ofono : ofonod[1789]: src/modem.c:ofono_modem_create() name: (null), type: telit ofonod[1789]: plugins/udevng.c:setup_telit() /sys/devices/pci0000:00/0000:00:1d.7/usb1/1-6 ofonod[1789]: plugins/udevng.c:setup_telit() /dev/ttyACM1 2/2/1 00 (null) Telit Wireless Module Modem ofonod[1789]: plugins/udevng.c:setup_telit() /dev/ttyACM2 2/2/1 02 (null) (null) ofonod[1789]: plugins/udevng.c:setup_telit() /dev/ttyACM3 2/2/1 04 (null) (null) ofonod[1789]: plugins/udevng.c:setup_telit() /dev/ttyACM4 2/2/1 06 (null) (null) ofonod[1789]: plugins/udevng.c:setup_telit() /dev/ttyACM5 2/2/1 08 (null) (null) ofonod[1789]: plugins/udevng.c:setup_telit() /dev/ttyACM6 2/2/1 0a (null) (null) ofonod[1789]: plugins/udevng.c:setup_telit() /dev/ttyACM7 2/2/1 0c (null) (null) ofonod[1789]: plugins/udevng.c:setup_telit() modem=/dev/ttyACM1 aux=/dev/ttyACM4 gps=(null) diag=/dev/ttyACM2 ofonod[1789]: src/modem.c:set_modem_property() modem 0x8d27150 property Modem ofonod[1789]: src/modem.c:set_modem_property() modem 0x8d27150 property Aux ofonod[1789]: src/modem.c:set_modem_property() modem 0x8d27150 property GPS ofonod[1789]: src/modem.c:ofono_modem_register() 0x8d27150 ofonod[1789]: plugins/telit.c:telit_probe() 0x8d27150 ofonod[1789]: src/modem.c:emit_modem_added() 0x8d27150 ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27150 property NetworkInterface ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27150 property SysPath ofonod[1789]: src/modem.c:__ofono_modem_append_properties() Ifname (null) ofonod[1789]: src/modem.c:call_modemwatches() 0x8d27150 added:1 ofonod[1789]: plugins/smart-messaging.c:modem_watch() modem: 0x8d27150, added: 1 ofonod[1789]: plugins/push-notification.c:modem_watch() modem: 0x8d27150, added: 1 ofonod[1789]: plugins/udevng.c:create_modem() /sys/devices/pci0000:00/0000:00:1d.7/usb1/1-1 ofonod[1789]: plugins/udevng.c:create_modem() driver=hso ofonod[1789]: src/modem.c:ofono_modem_create() name: (null), type: hso ofonod[1789]: plugins/udevng.c:setup_hso() /sys/devices/pci0000:00/0000:00:1d.7/usb1/1-1 ofonod[1789]: plugins/udevng.c:setup_hso() /dev/ttyHS0 255/255/255 00 (null) Diagnostic ofonod[1789]: plugins/udevng.c:setup_hso() /dev/ttyHS1 255/255/255 01 (null) GPS ofonod[1789]: plugins/udevng.c:setup_hso() /dev/ttyHS2 255/255/255 02 (null) GPS Control ofonod[1789]: plugins/udevng.c:setup_hso() /dev/ttyHS3 255/255/255 03 (null) Application ofonod[1789]: plugins/udevng.c:setup_hso() /dev/ttyHS4 255/255/255 06 (null) Control ofonod[1789]: plugins/udevng.c:setup_hso() /dev/ttyHS5 255/255/255 09 (null) Modem ofonod[1789]: plugins/udevng.c:setup_hso() control=/dev/ttyHS4 application=/dev/ttyHS3 modem=/dev/ttyHS5 network=(null) ofonod[1789]: src/modem.c:set_modem_property() modem 0x8d27718 property Control ofonod[1789]: src/modem.c:set_modem_property() modem 0x8d27718 property Application ofonod[1789]: src/modem.c:set_modem_property() modem 0x8d27718 property Modem ofonod[1789]: src/modem.c:set_modem_property() modem 0x8d27718 property NetworkInterface ofonod[1789]: src/modem.c:ofono_modem_register() 0x8d27718 ofonod[1789]: plugins/hso.c:hso_probe() 0x8d27718 ofonod[1789]: src/modem.c:emit_modem_added() 0x8d27718 ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27718 property NetworkInterface ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27718 property SysPath ofonod[1789]: src/modem.c:__ofono_modem_append_properties() Ifname (null) ofonod[1789]: src/modem.c:call_modemwatches() 0x8d27718 added:1 ofonod[1789]: plugins/smart-messaging.c:modem_watch() modem: 0x8d27718, added: 1 ofonod[1789]: plugins/push-notification.c:modem_watch() modem: 0x8d27718, added: 1 ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27718 property NetworkInterface ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27718 property SysPath ofonod[1789]: src/modem.c:__ofono_modem_append_properties() Ifname (null) ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27150 property NetworkInterface ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27150 property SysPath ofonod[1789]: src/modem.c:__ofono_modem_append_properties() Ifname (null) ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27718 property NetworkInterface ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27718 property SysPath ofonod[1789]: src/modem.c:__ofono_modem_append_properties() Ifname (null) ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27150 property NetworkInterface ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27150 property SysPath ofonod[1789]: src/modem.c:__ofono_modem_append_properties() Ifname (null) ofonod[1789]: plugins/telit.c:telit_enable() 0x8d27150 ofonod[1789]: src/modem.c:get_modem_property() modem 0x8d27150 property Modem ofonod[1789]: plugins/telit.c:open_device() Modem /dev/ttyACM1 I also used gdbserver to find out where the problem is. Here is the backtrace from where i think the failure is : │230 } │231 } │232 O_NONBLOCK); /* the open function fails and returns -1 */ │234 if (fd < 0) │235 return -1; │236 │237 tcflush(fd, TCIOFLUSH); #0 open_device (tty=0x8d27e08 "/dev/ttyACM1", options=0x8d1dbb0) at gatchat/gattty.c:233 #1 g_at_tty_open (tty=0x8d27e08 "/dev/ttyACM1", options=0x8d1dbb0) at gatchat/gattty.c:248 #2 0x080bd823 in open_device (modem=<value optimized out>, key=<value optimized out>, debug=0x81227a8 "Modem: ") at plugins/telit.c:210 #3 0x080bd8f3 in telit_enable (modem=0x8d27150) at plugins/telit.c:386 #4 0x080c0982 in set_powered (modem=0x8d27150, powered=1) at src/modem.c:885 #5 0x080c19fc in modem_set_property (conn=0x8d1f178, msg=0x8d2bca0, data=0x8d27150) at src/modem.c:1097 #6 0x08054e14 in process_message (connection=0x8d1f178, message=0xbf834460, method=0x8d2b614, iface_user_data=0x8d27150) at gdbus/object.c:224 #7 0xb77e12b2 in ?? () #8 0xb77d6544 in ?? () #9 0x08053bd0 in message_dispatch (data=0xb77f8ff4) at gdbus/mainloop.c:80 #10 0xb782d829 in ?? () #11 0xb782cf7d in ?? () #12 0xb782efee in ?? () #13 0xb783003e in ?? () #14 0x080bf1ff in main (argc=1, argv=0xbf834a54) at src/main.c:260 Here is what I have got so far... I don't understand why this open fails when the Option is plugged in since they don't use the same device ports (ttyACM? for HE910, and ttyHS? for GTM382) Thanks in advance for your help, Etienne Mabille