Problem Setting Up Raspberry Pi 4 + 4G LTE HAT with QMI

Raspberry Pi Network HATs
1

Hello,

I am using a raspbian Yodeck image, and I was able to SSh into it and now I am trying to setup internet connectivity via QMI. I am following the tutorial here:

Everything works perfectly, up until I do:

sudo udhcpc -v -i wwan0

It just shows:

udhcpc: started, v1.30.1
No resolv.conf for interface wwan0.udhcpc
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover

It shows sending discover, over and over, and I am not sure how to debug this as it’s not showing verbose logs and everything else works fine.

I appreciate any type of guidance or feedback on this, I can also get on a Zoom or Discord call to make helping easier.

Thank you!

Nicolas

2

Hi,

Did you go through the troubleshooting guide:

Whichever module you are using, the AT commands at the end of the guide will help you.

3

Hi Ensar,

Thank you for your reply!

I am using the Sixfab CORE, so I used the install script provided from the dashboard, all worked fine, but I cannot get a connection via wwlan0 / cellular.

In order to help you help me, here are the results from the support guide:

  1. cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
NAME="Raspbian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"
  1. uname -a
Linux raspberrypi 5.10.36-v7l+ #1418 SMP Thu May 13 18:17:17 BST 2021 armv7l GNU/Linux
  1. lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 1a2c:506f China Resource Semico Co., Ltd 
Bus 001 Device 011: ID 1bc7:1206 Telit Wireless Solutions 
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  1. lsusb -t
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 1: Dev 11, If 0, Class=Vendor Specific Class, Driver=option, 480M
        |__ Port 1: Dev 11, If 1, Class=Vendor Specific Class, Driver=, 480M
        |__ Port 1: Dev 11, If 2, Class=Communications, Driver=cdc_ether, 480M
        |__ Port 1: Dev 11, If 3, Class=CDC Data, Driver=cdc_ether, 480M
        |__ Port 1: Dev 11, If 4, Class=Vendor Specific Class, Driver=option, 480M
        |__ Port 1: Dev 11, If 5, Class=Vendor Specific Class, Driver=option, 480M
        |__ Port 1: Dev 11, If 6, Class=Vendor Specific Class, Driver=option, 480M
        |__ Port 1: Dev 11, If 7, Class=Vendor Specific Class, Driver=option, 480M
        |__ Port 2: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
        |__ Port 2: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
  1. usb-devices
T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480 MxCh= 1
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev=05.10
S:  Manufacturer=Linux 5.10.36-v7l+ xhci-hcd
S:  Product=xHCI Host Controller
S:  SerialNumber=0000:01:00.0
C:  #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
I:  If#=0x0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub

T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=480 MxCh= 4
D:  Ver= 2.10 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=2109 ProdID=3431 Rev=04.21
S:  Product=USB2.0 Hub
C:  #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I:  If#=0x0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub

T:  Bus=01 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#= 11 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=1bc7 ProdID=1206 Rev=03.18
S:  Manufacturer=Android
S:  Product=LE910C4-NF
S:  SerialNumber=0123456789ABCDEF
C:  #Ifs= 8 Cfg#= 1 Atr=a0 MxPwr=500mA
I:  If#=0x0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I:  If#=0x1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=(none)
I:  If#=0x2 Alt= 0 #EPs= 1 Cls=02(commc) Sub=06 Prot=00 Driver=cdc_ether
I:  If#=0x3 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether
I:  If#=0x4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
I:  If#=0x5 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
I:  If#=0x6 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
I:  If#=0x7 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option

T:  Bus=01 Lev=02 Prnt=02 Port=01 Cnt=02 Dev#=  4 Spd=1.5 MxCh= 0
D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=1a2c ProdID=506f Rev=01.11
S:  Manufacturer=SEM
S:  Product=USB Keyboard
C:  #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=98mA
I:  If#=0x0 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=01 Prot=01 Driver=usbhid
I:  If#=0x1 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid

T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=5000 MxCh= 4
D:  Ver= 3.00 Cls=09(hub  ) Sub=00 Prot=03 MxPS= 9 #Cfgs=  1
P:  Vendor=1d6b ProdID=0003 Rev=05.10
S:  Manufacturer=Linux 5.10.36-v7l+ xhci-hcd
S:  Product=xHCI Host Controller
S:  SerialNumber=0000:01:00.0
C:  #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
I:  If#=0x0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub

6.dmesg | grep tty

[    0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 video=HDMI-A-1:1280x720M@60 smsc95xx.macaddr=E4:5F:01:A6:F4:14 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait logo.nologo quiet mmc_block.card_quirks=0x80000000 net.ifnames=0
[    0.001110] printk: console [tty1] enabled
[    4.265103] fe201000.serial: ttyAMA0 at MMIO 0xfe201000 (irq = 36, base_baud = 0) is a PL011 rev2
[   10.359116] systemd[1]: Created slice system-getty.slice.
[   12.276063] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[   12.294202] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[   12.304956] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[   12.306735] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[   12.310515] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[   35.495402] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[   35.555567] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[   35.555992] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[   35.556409] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[   35.556816] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[   49.518683] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[   49.523278] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[   49.523676] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[   49.524067] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[   49.524559] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[  227.781078] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  227.853614] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  227.854822] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[  227.855922] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  227.860736] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[  241.574820] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[  241.589089] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[  241.590536] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[  241.591609] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[  241.592783] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[  437.193770] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  437.256268] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  437.256596] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[  437.256935] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  437.257283] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[  437.491570] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[  437.497470] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[  437.498094] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[  437.498740] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[  437.499369] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[  439.268014] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  439.334871] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  439.335812] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[  439.336746] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  439.337662] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[  449.961666] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[  449.977467] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[  449.978394] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[  449.979329] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[  449.980259] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[  596.514598] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  596.577831] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  596.578222] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[  596.578571] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  596.578923] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[  596.823844] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[  596.831877] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[  596.832627] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[  596.833503] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[  596.834272] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[  607.228913] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  607.285427] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  607.285899] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[  607.286354] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  607.286806] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[  621.261959] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[  621.274533] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[  621.275515] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[  621.276421] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[  621.277328] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[  817.386186] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  817.448854] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  817.449171] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[  817.450365] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  817.451106] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[  817.682944] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[  817.691974] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[  817.693030] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[  817.693980] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[  817.694350] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[  828.189628] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  828.235640] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  828.236293] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[  828.236996] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  828.237721] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[  841.952170] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[  841.966623] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[  841.967803] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[  841.968893] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[  841.970016] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[ 1064.576822] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[ 1064.659386] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[ 1064.659721] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[ 1064.660978] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[ 1064.663386] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[ 1064.893200] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[ 1064.899956] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[ 1064.900617] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[ 1064.901194] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[ 1064.901865] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[ 1075.522751] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[ 1075.596697] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[ 1075.597546] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[ 1075.598327] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[ 1075.599072] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[ 1089.312120] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[ 1089.325051] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[ 1089.326356] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[ 1089.327435] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[ 1089.328467] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[ 1285.600248] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[ 1285.679092] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[ 1285.679416] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[ 1285.679749] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[ 1285.680241] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[ 1285.913887] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[ 1285.920458] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[ 1285.920850] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[ 1285.921218] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[ 1285.921588] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[ 1296.483358] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[ 1296.557183] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[ 1296.557934] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[ 1296.558648] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[ 1296.560114] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[ 1310.273248] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[ 1310.281638] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[ 1310.282470] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[ 1310.283520] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[ 1310.284685] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
  1. ls -l /sys/bus/usb-serial/devices
total 0
lrwxrwxrwx 1 root root 0 Mar  1 20:07 ttyUSB0 -> ../../../devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.0/ttyUSB0
lrwxrwxrwx 1 root root 0 Mar  1 20:07 ttyUSB1 -> ../../../devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.4/ttyUSB1
lrwxrwxrwx 1 root root 0 Mar  1 20:07 ttyUSB2 -> ../../../devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.5/ttyUSB2
lrwxrwxrwx 1 root root 0 Mar  1 20:07 ttyUSB3 -> ../../../devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.6/ttyUSB3
lrwxrwxrwx 1 root root 0 Mar  1 20:07 ttyUSB4 -> ../../../devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.7/ttyUSB4
  1. ls -l /dev/serial/by-id
total 0
lrwxrwxrwx 1 root root 13 Mar  1 20:05 usb-Android_LE910C4-NF_0123456789ABCDEF-if00-port0 -> ../../ttyUSB0
lrwxrwxrwx 1 root root 13 Mar  1 20:05 usb-Android_LE910C4-NF_0123456789ABCDEF-if04-port0 -> ../../ttyUSB1
lrwxrwxrwx 1 root root 13 Mar  1 20:05 usb-Android_LE910C4-NF_0123456789ABCDEF-if05-port0 -> ../../ttyUSB2
lrwxrwxrwx 1 root root 13 Mar  1 20:05 usb-Android_LE910C4-NF_0123456789ABCDEF-if06-port0 -> ../../ttyUSB3
lrwxrwxrwx 1 root root 13 Mar  1 20:05 usb-Android_LE910C4-NF_0123456789ABCDEF-if07-port0 -> ../../ttyUSB4

AT RESPONSE
1. AT
OK

2. ATI
ATI
332

OK

3. AT+CGMR
M0F.660012

OK

4. AT+CPIN?
+CPIN: READY

OK

5. AT+CPAS
+CPAS: 0

OK

6. AT+CFUN?
#ECM: 0,1

OK

7. AT+COPS?
+COPS: 0,0,“AT&T”,7

OK

8. AT#USBCFG?
#USBCFG: 4

OK

9. AT#BND?
#BND: ,10,80800000000381A

OK

10. AT+CREG?
+CREG: 0,5

OK

11. AT+CGDCONT?
+CGDCONT: 1,“IPV4V6”,“super”,“”,0,0,0,0
+CGDCONT: 2,“IPV4V6”,“ims”,“”,0,0,0,0
+CGDCONT: 3,“IPV4V6”,“sos”,“”,0,0,0,1
+CGDCONT: 4,“IPV4V6”,“attm2mglobal”,“”,0,0,0,0

OK

12. AT+CSQ
+CSQ: 28,4

OK

13. AT+CGATT?
+CGATT: 0

OK

14. AT+GMM
LE910C4-NF

OK

15. AT#SWPKGV
25.21.662-P0F.662900
M0F.660012
P0F.662900
A0F.660012

OK

16. AT#FWSWITCH?
#FWSWITCH: 0,0,0

OK

17. AT+CGREG?
+CGREG: 0,5

OK

18. AT#CGPADDR=
#CGPADDR: 1,“100.82.99.172”
#CGPADDR: 2,“”
#CGPADDR: 3,“”
#CGPADDR: 4,“”

OK

4

I noticed based on the dmesg | grep tty command, that my modem is cycling or disconnecting and then reconnecting over and over again, is this normal behavior? Is this happening because it cannot find a connect?

5

Thanks for the detailed results.

If you are already using Sixfab CORE, you must not follow the QMI tutorial. Otherwise, it will conflict. The device is registered on the network, the signal quality is good, the modem has an IP address assigned by the network and configured PDP contexts, including the APN names.

Yes, CORE services may have rebooted your module to restore your cellular connection.

6

Oh ok, so thats good at least its connecting, but i guess its rebooting because of the conflict with QMI? I did intially set it up with QMI and later discovered the core setup instead.

How can i disable the QMI to precent any conflicts?

7

I have done a clean install and there is no QMI, and its still not working, I am experiencing the same problem as here: IoT hat disconnecting and reconnecting rapidly - #5 by zskatona

This seems to be a serious problem of the hardware, because I am using a 40 W Raspberry Pi 4 power supply, with no other peripherals, so the modem should have more than enough power available. I am using the short USB cable that comes with, I tried all USB ports, and it always keeps disconnecting and reconnecting.

This is a serious hardware bug and needs to be resolved ASAP Sixfab; this is unacceptable… I purchased two of these HATs for $125 each, only for none of them to work…

8

I never got the issue resolved, I just gave up on it…

9

You don’t have to do anything. So there are two methods for choosing your cellular connection. When you use CORE, it handles everything.

You don’t have any hardware bugs, don’t worry. If there are problems with your cellular connection CORE services may perform a hardware reboot, this is to be expected.

Can you send ping via your cellular interface (wwan0)?

If possible, could you please enable remote-support and PM me your remote-support token or Asset ICCID so I can check and fix it?

10

Yep, yep with 20 characters.