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I have the Huawei me909u521 modem attached to RPi 3 b+ via sixfab LTE hat (connected by GPIO).

The Rpi is detecting the modem:

pi@raspberrypi:~$ lsusb
Bus 001 Device 004: ID 12d1:1573 Huawei Technologies Co., Ltd. 
Bus 001 Device 005: ID 0424:7800 Standard Microsystems Corp. 
Bus 001 Device 003: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
Bus 001 Device 002: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

pi@raspberrypi:~$ dmesg | grep tty
[    0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 bcm2708_fb.fbwidth=656
 bcm2708_fb.fbheight=416 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x4
0000000  dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1 root=PARTUUID=8810a729-02 r
ootfstype=ext4 elevator=deadline fsck.repair=yes rootwait ip=192.168.0.102 quiet splash ply
mouth.ignore-serial-consoles
[    0.000301] console [tty1] enabled
[    0.729840] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 81, base_baud = 0) is a P
L011 rev2
[    9.398372] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB0
[    9.399005] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB1
[    9.399515] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB2
[    9.400025] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB3

But not adding a new interface for the modem in order to get IP address later on by AT commands.

pi@raspberrypi:~$ ifconfig -a
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.102  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::ba27:ebff:febf:a727  prefixlen 64  scopeid 0x20<link>
        ether b8:27:eb:bf:a7:27  txqueuelen 1000  (Ethernet)
        RX packets 3502  bytes 409754 (400.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 59801576  bytes 3229480227 (3.0 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 1524  bytes 59436 (58.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1524  bytes 59436 (58.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether b8:27:eb:ea:f2:72  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Shoul I see from the beginning the wwan0 interface for the modem or something is missing to apply?

Thanks in advance

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    I would check with your supplier the board supports your modem and what driver it needs if it does. The tech manual does not list your device specifically and states needs the driver of the compatible module that will be used with the Base HAT docs.sixfab.com/docs/… – user115418 Oct 24 '20 at 1:21

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