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I have connected the new Raspberry Pi 4 model b with the waveshare SIM7600E-H 4G HAT. The os is Raspbian Buster Lite. The configuration I use is the following: enter image description here 1) The jumpers are placed in the middle position.
2) The shield connected onto the RPi gpio.
3) There is also a connection between the pi and the waveshare "USB" port (not "USB to UART")
4) raspi-config > Interfacing Options > Serial = Login shell over serial = NO Serial port hardware enabled = YES
5) /boot/config.txt has enable_uart=1

So far I have managed to give AT commnads succesfully, and even have access on the internet via ppp0 as it shown in the waveshare wiki page: https://www.waveshare.com/wiki/SIM868_P%20...%20Networking

However I haven't managed to find a way to access 4g network via wwan0. I assume that this is related with the fact that in the /dev/ folder there are no ttyUSB serial ports.

Following info I found here:
https://www.raspberrypi.org/forums/viewtopic.php?t=224355

I gave the command:

sudo qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode='online' 

and got:

error: couldn't create QmiDevice: Couldn't query file info: Error when getting information for file “/dev/cdc-wdm0”: No such file or directory

since no /dev/cdc-wdm0 device exist.

I also tried to compile gobiserial from SIM7X00-Driver.7z. I updated the raspberrypi-kernel-headers but when I tried to compile the driver I got the following error:

GobiSerial.c:55:10: fatal error: linux/usb-wwan.h: No such file or directory

Has anyone any idea why no ttyUSB exist and how can wwan0 be configured

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  • Try $ ls /dev/ttyUSB*. For my two opened USB to serial ports on Rpi4B buster release 2019sep26, I got the following: /dev/ttyUSB0 /dev/ttyUSB1. Remember to always use terminal mode raspbi-config (or GUI Desktop equivalent) to (1) Enable serial port, (2) DISABLE serial console, whether you are using Rpi on board UART or not.
    – tlfong01
    Oct 8 '19 at 14:08
  • @tlfong01 The result of the command is cannot access '/dev/ttyUSB*.': No such file or directory. And as I have mentioned above I have already done Login shell over serial = NO Serial port hardware enabled = YES via raspbi-config
    – dk13
    Oct 8 '19 at 14:35
  • (1) I thought you wrongly searched /etc/dev/ttyUSB* instead of /dev/ttyUSB*, so I remind you that. (2) My answer is only limited to Rpi UART or USB/UART. Now a question: I usually python import serial to setup the USB serial ports. Do you use terminal commands or also python to setup USB serial ports? I am trying to point out that Rpi built in serial ports will setup "automatically", but for USB/UART, some cables's driver is not recognized, so you need to install drivers. I remember something like CH340, PL2xxx are OK. But I am not very sure. Perhaps I can check tomorrow. Bye.
    – tlfong01
    Oct 8 '19 at 14:50
  • I mean I read your comment "I assume that this is related with the fact that in the /etc/dev/ folder there are no ttyUSB serial ports.“. So I thought you searched the wrong folder. The correct folder should be just /dev/*.*. My apologies if my folder knowledge is wrong.
    – tlfong01
    Oct 8 '19 at 14:56
  • @tlfong01 Hi again and thanks for your answers. It's the first time I'm dealing with a raspberry pi so I haven't used neither terminal commands nor python to set up USB serial ports. If you have any recommendations on which to use they are more than welcome.
    – dk13
    Oct 8 '19 at 18:47
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First you have to press the pwrkey for around 3 seconds. Then wait for the Net LED to turn on (it can take up to around 15s). If there is a network, it should start slowly blinking after another 3-10 Seconds. Then try to run the command again.

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In case anyone has also issues. The link to the raspberry pi forum helped me. Following steps are working for me.

#install the packages
sudo apt-get update && sudo apt-get install libqmi-utils udhcpc
ifconfig wwan0 down
# Enable OS Raw IP Mode setting (not persistent) 
echo Y > /sys/class/net/wwan0/qmi/raw_ip
ifconfig wwan0 up
qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode='online'
#change apn value according to the service provider information (also maybe username and password are needed)
qmicli -d /dev/cdc-wdm0 --device-open-net="net-raw-ip|net-no-qos-header" --wds-start-network="apn='internet',ip-type=4" --client-no-release-cid 
udhcpc -i wwan0
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If ModemManager is running (which is is in recent versions of Ubuntu Desktop), it can block qmcli from working.

You can check if its running

$ ps ax | grep -i modem
832 ?        Ssl    0:01 /usr/sbin/ModemManager

And if so you can stop it with

sudo systemctl unmask ModemManager.service # may need this
sudo systemctl disable ModemManager.service

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