Wwan0; RPi3 + USB dongle(K3772-Z) - modem not found

Installing and Using OpenWrt Network and Wireless Configuration
1

I am testing a 4g/LTE system using RPi3. I installed the required packages based on the How To use LTE modem in QMI mode for WAN connection and several of the UMTS and 3G docs.

I am using a K3772-Z USB dongle (cheap ass vodafone device) with an RPI3 on v19.07.3.

Outputs from dmesg

[   14.041896] br-lan: port 1(eth0) entered forwarding state
[   85.651065] usb 1-1.2: new high-speed USB device number 5 using dwc_otg
[   85.792248] usb 1-1.2: New USB device found, idVendor=19d2, idProduct=1179
[   85.805620] usb 1-1.2: New USB device strings: Mfr=2, Product=1, SerialNumber=3
[   85.819499] usb 1-1.2: Product: K3772-Z
[   85.829897] usb 1-1.2: Manufacturer: Vodafone
[   85.840742] usb 1-1.2: SerialNumber: A748AC4BA699154F87B59F160140B0ADE32EFCD3
[   85.855221] usb-storage 1-1.2:1.0: USB Mass Storage device detected
[   85.868727] scsi host0: usb-storage 1-1.2:1.0
[   86.380435] usb 1-1.2: USB disconnect, device number 5
[   96.401058] usb 1-1.2: new high-speed USB device number 6 using dwc_otg
[   96.542421] usb 1-1.2: New USB device found, idVendor=19d2, idProduct=1181
[   96.555868] usb 1-1.2: New USB device strings: Mfr=3, Product=2, SerialNumber=4
[   96.569709] usb 1-1.2: Product: K3772-Z
[   96.580030] usb 1-1.2: Manufacturer: Vodafone
[   96.590825] usb 1-1.2: SerialNumber: A748AC4BA699154F87B59F160140B0ADE32EFCD3
[   96.607572] usb-storage 1-1.2:1.7: USB Mass Storage device detected
[   96.620978] scsi host0: usb-storage 1-1.2:1.7
[   97.672508] scsi 0:0:0:0: CD-ROM            Vodafone USB SCSI CD-ROM  0001 PQ: 0 ANSI: 0

I don't see a /dev/cdc* or /dev/ttyUSB*
and USB cat /proc/...usb... shows

T:  Bus=01 Lev=02 Prnt=02 Port=01 Cnt=02 Dev#=  6 Spd=480  MxCh= 0
D:  Ver= 2.00 Cls=02(comm.) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=19d2 ProdID=1181 Rev= 0.01
S:  Manufacturer=Vodafone
S:  Product=K3772-Z
S:  SerialNumber=A748AC4BA699154F87B59F160140B0ADE32EFCD3
C:* #Ifs=10 Cfg#= 1 Atr=80 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 0 Cls=02(comm.) Sub=08 Prot=00 Driver=(none)
I:  If#= 0 Alt= 1 #EPs= 0 Cls=02(comm.) Sub=08 Prot=00 Driver=(none)
I:* If#= 1 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=(none)
E:  Ad=81(I) Atr=03(Int.) MxPS=  64 Ivl=2ms
I:* If#= 2 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=(none)
E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=4ms
I:* If#= 3 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=(none)
E:  Ad=83(I) Atr=03(Int.) MxPS=  64 Ivl=2ms
I:* If#= 4 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=(none)
E:  Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=4ms
I:* If#= 5 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=06 Prot=00 Driver=(none)
E:  Ad=85(I) Atr=03(Int.) MxPS=  64 Ivl=2ms
I:* If#= 6 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=00 Driver=(none)
I:  If#= 6 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=(none)
E:  Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=4ms
I:* If#= 7 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E:  Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=87(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 8 Alt= 0 #EPs= 0 Cls=02(comm.) Sub=0b Prot=00 Driver=(none)
I:* If#= 9 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=00 Driver=(none)
I:  If#= 9 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=(none)
E:  Ad=88(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=4ms

Is there an obvious error that I should look for?

2

If you have all the necessary drivers installed that could mean that your modem (its VID:PID) is unknown to any of the drivers.
I would start from manually adding this VID:PID combination to option driver and connecting to the modem via terminal.

I suppose your modem is not QMI, I see it is supported by cdc_ether driver:

{
	/* ZTE (Vodafone) K3772-Z */
	USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0x1181, USB_CLASS_COMM,
				      USB_CDC_SUBCLASS_ETHERNET,
				      USB_CDC_PROTO_NONE),
	.driver_info = (unsigned long)&wwan_info,
},

So you should probably refer to https://openwrt.org/docs/guide-user/network/wan/wwan/ethernetoverusb_cdc

3

Hi and thanks for the info/update.
I am sort of tech-savvy (enough to work via terminal), but I don't know what I'm supposed to be looking for.

I would start from manually adding this VID:PID combination to option driver and connecting to the modem via terminal

How would i achieve this?

4

Something like

echo "19d2 1181" > /sys/bus/usb-serial/drivers/option/new_id