Scripts for Raspberry Pi 4G hat (SIM7600) with GPS configuration

Scripts based on this description:Setup wwan0 interface for 4G network

Hardware requirements:

• Raspberry Pi 3B+
• Waveshare 4G hat SIM7600e-H
• SIM card (standard size 15 x 25mm preferable)

4G hat conneted to Raspberry via USB, the folowing devices are created: /dev/ttyUSB1 - for communication with GPS part (NMEA protocol), 9600 bod default /dev/ttyUSB3 - main communication port, AT commands, 115200 bod default

Software requirements:

• scripts were tested with DietPi and Linux 4.19.75-v7+
• QMI driver is used to communicate with modem (packets libqmi-utils, udhcpc)
• packets gpsd, gpsd-clients, python-gps for the GPS use

Contents:

start_lte.sh - bash script that disable WiFi interface and configures LTE as wwan0, also prints information configure_gps.py - Python 3 script that configure SIM7600 for GPS (uses pyserial module)

Additional configuration

1. Provider information

This part of script contains provider information ans should be changed to meet actual requirements (enter APN, Username and Password).

Example for Megafon (Russia):

sudo qmicli -p -d /dev/cdc-wdm0 --device-open-net='net-raw-ip|net-no-qos-header' --wds-start-network="apn='internet',username='gdata',password='gdata',ip-type=4" --client-no-release-cid

Example for TELE2 (Russia):

sudo qmicli -p -d /dev/cdc-wdm0 --device-open-net='net-raw-ip|net-no-qos-header' --wds-start-network="apn='internet.TELE2.ru',ip-type=4" --client-no-release-cid

NOTE: Many cellular operators block modem devices when that works with regual SIM cards. Please ensure that you're use proper plan and your SIM card suitable for modem use.

GPS using

1. Run Python 3 script configure_gps.py to enable GPS output on SIM7600

2. Check that gpsd daemon is not running:

sudo lsof -i :2947 #find process that uses gpsd port 
sudo lsof | grep ttyU #find process that uses ttyUSB

3. One can disable startup service configuration for the gpsd on Raspberry Pi by

sudo update-rc.d gpsd disable #disable boot service

Reboot is needed after changing configuration.

4. Run gpsd daemon with custom configuration. Please also check this guide

sudo gpsd -n -N -D9 -F /dev/ttyUSB1

This command prints debug output that you can check for possible errors. It uses standart input for PPS signal, but you can change it by

sudo gpsd -n -G -N -D9 -F /var/run/gpsd.sock /dev/ttyUSB1 /dev/pps0

and add this lines to /DietPi/settings.txt file (not tested yet):

dtoverlay=pps-gpio,gpiopin=18 tp 

where GPIO18 - Raspberry Pi pin for PPS signal. You can test PPS by command

sudo ppstest /dev/pps0 #(require packet pps-tools)

5. View GPS information by

gpsmon /dev/ttyUSB1  # view GPS