BLE Heart Rate Monitor Simulator (ESP32)

An ESP32-based BLE peripheral that simulates a Bluetooth Heart Rate Monitor. Useful for testing BLE clients without needing a real chest strap.

Created as a testing tool for my demo iOS app.

Features

• Advertises standard Heart Rate Service (UUID 0x180D)
• Implements Heart Rate Measurement characteristic (UUID 0x2A37)
• Implements Client Characteristic Configuration Descriptor (UUID 0x2902) enabling notifications
• Sends both 8-bit and 16-bit (above 255) BPM values
• Simulates a natural sine-wave heart rhythm with randomized spikes
• Written in C++
• Uses the NimBLE-Arduino BLE library

Requirements

• Any ESP32 development board with Bluetooth
• No external wiring or sensors required, this is a pure software simulator
• VS Code with PlatformIO plugin