Raspberry pi with SIM7600E not connecting to internet automatically after reboot

Question

Please note that I have a Raspberry pi 4 and a SIM7600E-H1C module and I want my Raspberry pi to be connected to the internet all the time. So I used the SIM7600 module, plugged in and inserted the SIM card. I can provide internet to Raspberry pi using this commandand the IP of both SIM7600 and Raspberry pi must match in order to use the internet, for example:but my problem is When the Raspberry pi Reboot and turn it back on Refuses to connect automatically as expected So I have to re-enter the sudo command every time my computer reboots. I want SIM7600E works like an aircard that inserts a SIM card and plugs it in to use the internet right away. Can anyone help me with this? Or is there a way to set the IP somewhere?

I follow this website https://www.elementzonline.com/blog/accessing-internet-(jio-sim)-in-sim7600-4g-modem-v2.0-with-Raspberry-pi-using-qmi-interface

Answer 1

You can make a python script that is executed automatically at reboot.

The python script only needs to do os.system('sudo ifup wwan0')

Answer 2

You can make a bash script + udev rule to detect the interface and execute your script. For example, create the file: /etc/udev/rules.d/99-simcom.rules.

ACTION=="add", SUBSYSTEMS=="net", KERNEL=="wwan*", RUN+="/usr/local/bin/simcom.sh '%E{INTERFACE}'"

That means when a wwan* interface is detected, it will execute the script located at /usr/local/bin/simcom.sh and pass to it the interface name (wwan0 for example).

When you create this rule, it will not be executed until reboot or if you reload your rules with:

sudo udevadm control --reload-rules && sudo udevadm trigger

Then you will need to create that simcom.sh file and execute your comands like

File: /usr/local/bin/simcom.sh

ip link set $1 down
echo 'Y' # etc...

Remember to make it executable with sudo chmod +x /usr/local/bin/simcom.sh

---

An alternative is change the SIM7600 mode and use RNDIS instead of QMI, which is easier to setup but you also will need a small script to get IP with dhclient ir udhcpc.

The interface will be renamed to usb0 instead of wwan0 and you will only need a couple of commands.

A couple of years ago I answered a question before with the instructions here: SIM7600 as RNDIS interface for Raspberry Pi

Hope it helps!