Hello everyone,
I wanted to share an issue I’m facing with the Quectel EC25 Modem while monitoring VoLTE Quality. I have a script that runs every 5 minutes, initiating a call, recording reference audio, and calculating KPIs for that call.
The problem arises after the measurement is complete - I lose the ability to ping Google. Although I get an IP4 address, my operating system seems to lose internet connectivity. Here’s the log from the qmi_quectel service:
[06-21_10:33:48:131] Find /sys/bus/usb/devices/1-1.1 idVendor=0x2c7c idProduct=0x125, bus=0x001, dev=0x003
[06-21_10:33:48:131] Auto find qmichannel = /dev/cdc-wdm0
[06-21_10:33:48:131] Auto find usbnet_adapter = wwan0
[06-21_10:33:48:131] netcard driver = qmi_wwan, driver version = 5.15.76-v8+
[06-21_10:33:48:132] ioctl(0x89f3, qmap_settings) failed: Operation not supported, rc=-1
[06-21_10:33:48:132] Modem works in QMI mode
[06-21_10:33:48:149] cdc_wdm_fd = 8
[06-21_10:33:48:247] Get clientWDS = 4
[06-21_10:33:48:279] Get clientWDS = 21
[06-21_10:33:48:311] Get clientDMS = 1
[06-21_10:33:48:343] Get clientNAS = 4
[06-21_10:33:48:375] Get clientUIM = 1
[06-21_10:33:48:407] Get clientWDA = 1
[06-21_10:33:48:439] requestBaseBandVersion EC25EFAR06A16M4G
[06-21_10:33:48:600] requestGetSIMStatus SIMStatus: SIM_READY
[06-21_10:33:48:600] requestSetProfile[1] internet///0
[06-21_10:33:48:664] requestGetProfile[1] internet///0
[06-21_10:33:48:695] requestRegistrationState2 MCC: 262, MNC: 3, PS: Attached, DataCap: EDGE
[06-21_10:33:48:727] requestQueryDataCall IPv4ConnectionStatus: CONNECTED
[06-21_10:33:48:759] requestQueryDataCall QMUXResult = 0x1, QMUXError = 0x5a
[06-21_10:33:48:759] ifconfig wwan0 up
[06-21_10:33:50:327] requestQueryDataCall IPv4ConnectionStatus: DISCONNECTED
[06-21_10:33:50:360] requestQueryDataCall IPv6ConnectionStatus: DISCONNECTED
[06-21_10:33:50:360] ifconfig wwan0 down
[06-21_10:33:50:368] ifconfig wwan0 0.0.0.0
[06-21_10:33:51:449] requestRegistrationState2 MCC: 262, MNC: 3, PS: Attached, DataCap: LTE
[06-21_10:33:51:481] requestSetupDataCall WdsConnectionIPv4Handle: 0x87255850
[06-21_10:33:51:929] requestSetupDataCall WdsConnectionIPv6Handle: 0x87253db0
[06-21_10:33:52:025] requestRegistrationState2 MCC: 262, MNC: 3, PS: Attached, DataCap: LTE
[06-21_10:33:52:121] ifconfig wwan0 up
[06-21_10:33:52:129] busybox udhcpc -f -n -q -t 5 -i wwan0
[06-21_10:33:52:295] ip -6 address add 2a02:3033:0605:712d:b08d:b758:1cb6:921a/64 dev wwan0
[06-21_10:33:52:304] ip -6 route add default via 2a02:3033:0605:712d:304c:946d:a828:aece dev wwan0
[06-21_10:36:09:451] requestRegistrationState2 MCC: 262, MNC: 3, PS: Attached, DataCap: EDGE
[06-21_10:36:34:707] requestDeactivateDefaultPDP WdsConnectionIPv4Handle
[06-21_10:36:34:734] requestDeactivateDefaultPDP WdsConnectionIPv6Handle
[06-21_10:36:35:767] requestDeactivateDefaultPDP err = 0
[06-21_10:36:35:767] ifconfig wwan0 down
[06-21_10:36:35:777] ifconfig wwan0 0.0.0.0
[06-21_10:36:35:982] QmiWwanThread exit
[06-21_10:36:35:983] qmi_main exit
[06-21_10:36:36:000] Find /sys/bus/usb/devices/1-1.1 idVendor=0x2c7c idProduct=0x125, bus=0x001, dev=0x003
[06-21_10:36:36:000] Auto find qmichannel = /dev/cdc-wdm0
[06-21_10:36:36:000] Auto find usbnet_adapter = wwan0
[06-21_10:36:36:000] netcard driver = qmi_wwan, driver version = 5.15.76-v8+
[06-21_10:36:36:001] ioctl(0x89f3, qmap_settings) failed: Operation not supported, rc=-1
[06-21_10:36:36:001] Modem works in QMI mode
[06-21_10:36:36:021] cdc_wdm_fd = 8
[06-21_10:36:36:118] Get clientWDS = 4
[06-21_10:36:36:151] Get clientWDS = 21
[06-21_10:36:36:183] Get clientDMS = 1
[06-21_10:36:36:215] Get clientNAS = 4
[06-21_10:36:36:248] Get clientUIM = 1
[06-21_10:36:36:278] Get clientWDA = 1
[06-21_10:36:36:311] requestBaseBandVersion EC25EFAR06A16M4G
[06-21_10:36:36:471] QmiWwanThread poll err/hup/inval
[06-21_10:36:36:471] poll fd = 8, events = 0x0009
[06-21_10:36:36:471] QmiWwanThread poll err/hup/inval
[06-21_10:36:36:471] poll fd = 8, events = 0x0008
[06-21_10:36:36:472] requestGetSIMStatus SIMStatus: SIM_READY
[06-21_10:36:36:472] requestSetProfile[1] internet///0
[06-21_10:36:36:472] QmiWwanThread poll err/hup/inval
[06-21_10:36:36:472] poll fd = 8, events = 0x0008
[06-21_10:36:36:472] QmiWwanThread poll err/hup/inval
[06-21_10:36:36:472] poll fd = 8, events = 0x0008
[06-21_10:36:36:472] QmiWwanThread poll err/hup/inval
[06-21_10:36:36:472] poll fd = 8, events = 0x0008
[06-21_10:36:36:472] QmiWwanThread poll err/hup/inval
[06-21_10:36:36:472] poll fd = 8, events = 0x0008
I would greatly appreciate any insights or suggestions on how to resolve this issue. Thank you in advance for your help 
.