PPPoS Example using Mongoose OS App

Overview

This app shows how to connect to the internet via a GSM modem using the PPP protocol.

Prereq

GPIO pins that are used for UART interface for ESP32:

• UART 0

  • RX GPIO: 3
  • TX GPIO: 1

• UART 1

  • RX GPIO: 25
  • TX GPIO: 26

• UART 2

  • RX GPIO: 16
  • TX GPIO: 17

The hardware that we are using:

• ESP32 Dev Board
• SIM868 Module Board

Hardware Connections

• UART 1 is used
• Common GND for ESP32 and SIM868 module
• GPIO15 of ESP32 is connected to GPIO7 (RPi Board) pin on SIM868 module. Pulling it low for 4 seconds and then pulling it high turns the module on.
• Dedicated power supply to SIM868 is required otherwise it would keep restarting.

Details

PPP library automatically connects to the GPRS network and obtains an IP address.

Resources

• https://simcom.ee/modules/gsm-gprs-gnss/sim868/