DHCP issue with RM551E-GL

andreagiga · June 12, 2025, 6:23am

Hi all
I’ve an issue with the RM551E-GL modem using the driver version Quectel_Linux_Android_QMI_WWAN_Driver_V1.2.9, it does not get the IP from the DHCP:
root@belabox:/home/user/quectel-CM# ./quectel-CM -s mobile.vodafone.it -p 1
[06-11_08:31:13:555] Quectel_QConnectManager_Linux_V1.5
[06-11_08:31:13:558] Find /sys/bus/usb/devices/2-1 idVendor=0x2c7c idProduct=0x122
[06-11_08:31:13:558] Auto find qmichannel = /dev/cdc-wdm0
[06-11_08:31:13:558] Auto find usbnet_adapter = wwan0
[06-11_08:31:13:559] qmap_mode = 1, muxid = 0x81, qmap_netcard = wwan0
[06-11_08:31:13:560] Modem works in QMI mode
[06-11_08:31:13:560] qmap_mode = 1, muxid = 0x81, qmap_netcard = wwan0
[06-11_08:31:13:576] cdc_wdm_fd = 7
[06-11_08:31:13:655] Get clientWDS = 15
[06-11_08:31:13:687] Get clientDMS = 1
[06-11_08:31:13:719] Get clientNAS = 1
[06-11_08:31:13:751] Get clientUIM = 2
[06-11_08:31:13:783] Get clientWDA = 1
[06-11_08:31:13:815] requestBaseBandVersion RM551EGL00AAR01A03M8G
[06-11_08:31:13:847] qmap_settings.rx_urb_size = 31744
[06-11_08:31:13:972] requestGetSIMStatus SIMStatus: SIM_READY
[06-11_08:31:13:973] requestSetProfile[1] mobile.vodafone.it///0
[06-11_08:31:14:038] requestGetProfile[1] mobile.vodafone.it///0
[06-11_08:31:14:071] requestRegistrationState2 MCC: 222, MNC: 10, PS: Attached, DataCap: LTE
[06-11_08:31:14:103] requestQueryDataCall IPv4ConnectionStatus: DISCONNECTED
[06-11_08:31:14:104] ifconfig wwan0 down
[06-11_08:31:14:109] ifconfig wwan0 0.0.0.0
[06-11_08:31:14:743] requestSetupDataCall WdsConnectionIPv4Handle: 0xe2bfacb0
[06-11_08:31:14:872] ifconfig wwan0 up
[06-11_08:31:14:879] busybox udhcpc -f -n -q -t 5 -i wwan0
udhcpc: started, v1.30.1
udhcpc: sending discover
^C[06-11_08:31:17:697] requestDeactivateDefaultPDP WdsConnectionIPv4Handle
[06-11_08:31:17:783] ifconfig wwan0 down
[06-11_08:31:17:791] ifconfig wwan0 0.0.0.0
[06-11_08:31:17:978] QmiWwanThread exit
[06-11_08:31:17:979] qmi_main exit
root@belabox:/home/user/quectel-CM# ./quectel-CM -s mobile.vodafone.it -p 1
[06-11_08:31:24:515] Quectel_QConnectManager_Linux_V1.5
[06-11_08:31:24:516] Find /sys/bus/usb/devices/2-1 idVendor=0x2c7c idProduct=0x122
[06-11_08:31:24:516] Auto find qmichannel = /dev/cdc-wdm0
[06-11_08:31:24:516] Auto find usbnet_adapter = wwan0
[06-11_08:31:24:517] qmap_mode = 1, muxid = 0x81, qmap_netcard = wwan0
[06-11_08:31:24:517] Modem works in QMI mode
[06-11_08:31:24:517] qmap_mode = 1, muxid = 0x81, qmap_netcard = wwan0
[06-11_08:31:24:530] cdc_wdm_fd = 7
[06-11_08:31:24:631] Get clientWDS = 15
[06-11_08:31:24:663] Get clientDMS = 1
[06-11_08:31:24:695] Get clientNAS = 1
[06-11_08:31:24:727] Get clientUIM = 2
[06-11_08:31:24:757] Get clientWDA = 1
[06-11_08:31:24:791] requestBaseBandVersion RM551EGL00AAR01A03M8G
[06-11_08:31:24:823] qmap_settings.rx_urb_size = 31744
[06-11_08:31:24:952] requestGetSIMStatus SIMStatus: SIM_READY
[06-11_08:31:24:952] requestSetProfile[1] mobile.vodafone.it///0
[06-11_08:31:25:079] requestGetProfile[1] mobile.vodafone.it///0
[06-11_08:31:25:111] requestRegistrationState2 MCC: 222, MNC: 10, PS: Attached, DataCap: LTE
[06-11_08:31:25:141] requestQueryDataCall IPv4ConnectionStatus: DISCONNECTED
[06-11_08:31:25:141] ifconfig wwan0 down
[06-11_08:31:25:147] ifconfig wwan0 0.0.0.0
[06-11_08:31:25:623] requestSetupDataCall WdsConnectionIPv4Handle: 0xe2bfacb0
[06-11_08:31:25:754] ifconfig wwan0 up
[06-11_08:31:25:763] busybox udhcpc -f -n -q -t 5 -i wwan0
udhcpc: started, v1.30.1
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: no lease, failing

Have you faced this problem in the past? do you have an additional linux driver to test?
Thanks

Andrea

leon.bao · June 12, 2025, 6:37am

Hi,@andreagiga

Are there any more logs after this? Everything is normal up to this point. The following operation will configure the module into raw IP, and then DHCP will be successful.

andreagiga · June 12, 2025, 8:54am

Hi
no after few minutes it just print that:

[06-11_10:33:48:027] busybox udhcpc -f -n -q -t 5 -i wwan0
udhcpc: started, v1.30.1
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: no lease, failing
[06-11_10:37:48:514] requestRegistrationState2 MCC: 222, MNC: 10, PS: Attached, DataCap: LTE
[06-11_10:38:18:821] requestRegistrationState2 MCC: 222, MNC: 10, PS: Attached, DataCap: LTE

leon.bao · June 12, 2025, 9:08am

Hi,@andreagiga
I’ve already sent you the latest tool via email. Please try it again using the new tool.

andreagiga · June 12, 2025, 9:46am

Thanks @leon.bao
I’m using the tool you shared: Quectel_Linux_Android_QMI_WWAN_Driver_V1.2.9.zip
I’ve also tested the sim with another modem that get the IP address from the operator DHCP.
any ideas?

andreagiga · June 12, 2025, 1:32pm

Hi @leon.bao
I saw you shared a link Quectel_QConnectManager_Linux_V1.6.8 via mail but I’m not authorized (although I entered the OTP received via mail).
Regards

leon.bao · June 13, 2025, 1:12am

Hi,@andreagiga
I have resent via private message. Please check it.

andreagiga · June 24, 2025, 8:38am

Hi @leon.bao
I’m testing the modem with the new tool you shared. it works for few seconds and then the wwan0_1 go down.
Any suggestions?
Thanks

root@belabox:/home/user/Quectel_QConnectManager_Linux_V1.6.8# ./quectel-CM -s 5gmec-mediaprod-mobilebroadcast.vodafone.it &
[1] 3533
root@belabox:/home/user/Quectel_QConnectManager_Linux_V1.6.8# [06-24_08:35:51:986] QConnectManager_Linux_V1.6.8
[06-24_08:35:51:989] Find /sys/bus/usb/devices/7-1 idVendor=0x2c7c idProduct=0x122, bus=0x007, dev=0x003
[06-24_08:35:51:990] Auto find qmichannel = /dev/cdc-wdm0
[06-24_08:35:51:990] Auto find usbnet_adapter = wwan0
[06-24_08:35:51:990] netcard driver = qmi_wwan_q, driver version = V1.2.9
[06-24_08:35:51:990] qmap_mode = 1, qmap_version = 9, qmap_size = 31744, muxid = 0x81, qmap_netcard = wwan0_1
[06-24_08:35:51:991] Modem works in QMI mode
[06-24_08:35:52:007] cdc_wdm_fd = 7
[06-24_08:35:52:303] Get clientWDS = 15
[06-24_08:35:52:335] Get clientDMS = 1
[06-24_08:35:52:367] Get clientNAS = 1
[06-24_08:35:52:399] Get clientUIM = 2
[06-24_08:35:52:434] Get clientWDA = 1
[06-24_08:35:52:463] requestBaseBandVersion RM551EGL00AAR01A03M8G
[06-24_08:35:52:495] qmap_settings.rx_urb_size = 31744
[06-24_08:35:52:496] qmap_settings.ul_data_aggregation_max_datagrams = 11
[06-24_08:35:52:496] qmap_settings.ul_data_aggregation_max_size = 8192
[06-24_08:35:52:496] qmap_settings.dl_minimum_padding = 0
[06-24_08:35:52:626] requestGetSIMStatus SIMStatus: SIM_READY
[06-24_08:35:52:687] requestGetProfile[pdp:1 index:1] 5gmec-mediaprod-mobilebroadcast.vodafone.it///0/IPV4
[06-24_08:35:52:688] requestSetProfile[pdp:1 index:1] 5gmec-mediaprod-mobilebroadcast.vodafone.it///0/IPV4
[06-24_08:35:52:688] no need to set skip the rest
[06-24_08:35:52:720] requestRegistrationState2 MCC: 222, MNC: 10, PS: Attached, DataCap: LTE
[06-24_08:35:52:751] requestQueryDataCall IPv4ConnectionStatus: DISCONNECTED
[06-24_08:35:52:752] ip link set dev wwan0 down
[06-24_08:35:52:765] ip addr flush dev wwan0_1
[06-24_08:35:52:771] ip link set dev wwan0_1 down
[06-24_08:35:52:818] requestSetupDataCall WdsConnectionIPv4Handle: 0xe32a8100
[06-24_08:35:52:944] ip link set dev wwan0 up
[06-24_08:35:52:952] ip link set dev wwan0_1 up
[06-24_08:35:52:968] busybox udhcpc -f -n -q -t 5 -i wwan0_1
udhcpc: started, v1.30.1
udhcpc: sending discover
udhcpc: sending select for 10.145.64.5
udhcpc: lease of 10.145.64.5 obtained, lease time 7200
[06-24_08:36:05:384] QmiWwanThread poll err/hup/inval
[06-24_08:36:05:384] poll fd = 7, events = 0x0018
[06-24_08:36:05:384] QmiWwanThread exit
[06-24_08:36:05:385] ip addr flush dev wwan0_1
Device “wwan0_1” does not exist.
[06-24_08:36:05:399] ip link set dev wwan0_1 down
Cannot find device “wwan0_1”
[06-24_08:36:05:419] qmi_main exit

leon.bao · June 25, 2025, 1:33am

Hi,@andreagiga
It seems that the connection is broken. Please check the USB connection. Additionally, there is a conflict between ModemManager and quectel-CM. Please make sure to disable or uninstall ModemManager when using quectel-CM.

andreagiga · June 27, 2025, 5:22pm

hi @leon.bao
changing the usb port now the connection is stable. I’m facing some problems with bandwidth that seams really poor. using the same Sim card on a another usb modem (iphone in usb tethering same port) is ok.
any suggestion for troubleshooting?
best regards

silvia · July 1, 2025, 3:47am

Dear @andreagiga
Please confirm these two devices in the same band combination for comparison.