Here's a quick overview of what Horcher is and how it works.
Self-designed transmitter and receiver PCBs using FSK modulation, controlled by an STM32 microcontroller.
A frame-based UART protocol with CRC16 integrity checking connects the STM32 to the ESP32 WiFi bridge.
A self-hosted Node.js server on Ubuntu routes data between ESP devices and the browser in real time.
Send text, images, and audio directly to embedded devices from any browser — no installation needed.
For the full technical documentation, source code, and implementation details, visit our GitHub repository — everything is open source.