A simple shell script to configure a Raspberry Pi for connecting to a GSM network over PPP. The assumption is made that the GSM module is already connected to the main UART, /dev/ttyAMA0.
Edit /boot/config.txt, and make sure it contains these lines:
dtoverlay=pi3-miniuart-bt
enable_uart=1
force_turbo=1
(Note, multiple dtoverlay lines can exist.)
If the lines needed to have been added, reboot the Pi.
The script should be run as root. To run using sudo, execute it as follows:
cat gprs-conf.sh | sudo bashA systemd service called gprs should now exist.