sim868

Raspberry PI 3B Plus, GPS/GNSS/GSM/GPRS hat for smart home / package receiver / mongodb

Enable GPIO UART

Add to /boot/config.txt string:

enable_uart=1

sudo raspi-config

-> Interfacing Options

-> P6 Serial

-> Would you like a login shell to be accessible over serial? No

-> Would you like the serial port hardware to be enabled? Yes

pyserial