Hello,
After hours and hours, I decided to post this question so maybe it is a known bug or there is something missing in the documentation in order to make this module work properly in a Linux Ubuntu 20 setup, here it goes:
Problems:
a) Using qmi_wwan_q and quectel-CM the host fails to obtain IP via DHCP
b) Using qmi_wwan (stock version) and quectel-CM host is able to obtain ip via DHCP BUT performs poorly in terms of throughput (it does never reach beyond 200 mbps , while other test device (phone) gets 450 mbps with the exact same radio conditions)
A priori diagnosis:
-Modem itself gets connected with no problem, obtains IP and everything as reported via AT+CGPADDRR;
-Sometimes when Quectel-CM forces Raw IP mode on the qmi interface and then reinitiates dhcp requests on it, it gets IP… sometimes.
I did SEVERAL tests , I restarted the module , the board , the host , everything… but nothing did work… please help!
Conditions:
OS: Ubuntu 20
Module Platform: 5G EVB via USB-C cable to Host (Linux)
Drivers: quectel_cm 1.5 , qmi_wwan_q 1.2 (as far as I remember)
RF/Operator : Lab conditions in RF BOX , excellent radio conditions with NSA B1+N78 MIMO 2x2, phones do get around 450 to 510 Mbps
Module info:
OK
ATI
Quectel
RG500Q-EA
Revision: RG500QEAAAR10A03M4G
OK
AT+CFUN=1
OK
AT+CGATT=1
OK
AT+QSPN
+QSPN: “ViMMOR”,“ViMMOR”,"",0,“00101”
OK
AT+CGDCONT?
+CGDCONT: 1,“IP”,“default”,“0.0.0.0”,0,0,0,0,"",0
+CGDCONT: 2,“IPV4V6”,“ims”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,at
OK
AT+CGPADDR
+CGPADDR: 1,“192.168.10.2”
+CGPADDR: 2,""
+CGPADDR: 3,""
qmi_wwan_q log
[ 2957.622486] qmi_wwan_q 2-1:1.4: cdc-wdm0: USB WDM device
[ 2957.622758] qmi_wwan_q 2-1:1.4: Quectel RG500Q-EA work on RawIP mode
[ 2957.622916] qmi_wwan_q 2-1:1.4: rx_urb_size = 31744
[ 2957.628066] qmi_wwan_q 2-1:1.4 rmnet_usb0: register ‘qmi_wwan_q’ at usb-0000:00:15.0-1, RMNET/USB device, 2a:9a:02:30:a0:4a
[ 2957.630177] usbcore: registered new interface driver qmi_wwan_q
[ 2957.637862] qmi_wwan_q 2-1:1.4 enx2a9a0230a04a: renamed from rmnet_usb0
quectel-CM LOG
[04-15_02:27:22:377] Quectel_QConnectManager_Linux_V1.5
[04-15_02:27:22:378] Find /sys/bus/usb/devices/2-1 idVendor=0x2c7c idProduct=0x800
[04-15_02:27:22:379] Auto find qmichannel = /dev/cdc-wdm0
[04-15_02:27:22:379] Auto find usbnet_adapter = enx2a9a0230a04a
[04-15_02:27:22:379] qmap_mode = 1, muxid = 0x81, qmap_netcard = enx2a9a0230a04a
[04-15_02:27:22:379] Modem works in QMI mode
[04-15_02:27:22:380] qmap_mode = 1, muxid = 0x81, qmap_netcard = enx2a9a0230a04a
[04-15_02:27:22:402] cdc_wdm_fd = 7
[04-15_02:27:23:402] QmiThreadSendQMITimeout pthread_cond_timeout_np timeout
[04-15_02:27:24:753] Get clientWDS = 15
[04-15_02:27:24:785] Get clientDMS = 1
[04-15_02:27:24:817] Get clientNAS = 4
[04-15_02:27:24:849] Get clientUIM = 1
[04-15_02:27:24:881] Get clientWDA = 1
[04-15_02:27:24:913] requestBaseBandVersion RG500QEAAAR10A03M4G
[04-15_02:27:24:945] qmap_settings.rx_urb_size = 16384
[04-15_02:27:25:073] requestGetSIMStatus SIMStatus: SIM_READY
[04-15_02:27:25:073] requestSetProfile[1] default///0
[04-15_02:27:25:136] requestGetProfile[1] default///0
[04-15_02:27:25:169] requestRegistrationState2 MCC: 1, MNC: 1, PS: Attached, DataCap: LTE
[04-15_02:27:25:201] requestQueryDataCall IPv4ConnectionStatus: DISCONNECTED
[04-15_02:27:25:201] ifconfig enx2a9a0230a04a down
[04-15_02:27:25:208] ifconfig enx2a9a0230a04a 0.0.0.0
[04-15_02:27:25:233] requestSetupDataCall WdsConnectionIPv4Handle: 0x4923d800
[04-15_02:27:25:362] ifconfig enx2a9a0230a04a up
[04-15_02:27:25:368] busybox udhcpc -f -n -q -t 5 -i enx2a9a0230a04a
udhcpc: started, v1.30.1
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: no lease, failing
Thanks!
Raul
pd: company QIN Technology - Chile
