A Wi-Fi modem simulator that extends ESP-AT with PPP server capabilities, turning ESP32 into a fully functional Wi-Fi modem. Perfect for testing AT commands and PPP connections without real hardware dependencies.

What it does

Extends ESP-AT firmware with PPP server functionality
Provides DATA mode for raw IP communication
Enables existing communication stacks (MQTT, HTTP, custom protocols) to work over Wi-Fi
Ideal for testing ESP-Modem library and CI reliability

Quick Start

cd common_components/modem_sim
./install.sh
source export.sh
idf.py build

Custom Platform/Module

./install.sh PLATFORM_ESP32S3 WROOM-32

Configuration

The sdkconfig.defaults includes:

Wi-Fi and Bluetooth enabled
PPP server support
AT commands for HTTP/MQTT
4MB flash configuration

Project Structure

modem_sim/
├── install.sh              # Installation script
├── export.sh               # Environment setup
├── sdkconfig.defaults      # Default configuration
├── pppd_cmd/               # Custom PPP commands
└── modem_sim_esp32/        # Generated ESP-AT build

Use Cases

Testing ESP-Modem library without real hardware
Quick Wi-Fi connectivity for existing communication stacks
CI/CD testing with reliable modem simulation
Development and debugging of AT command implementations