I will write esp32 and nrf52 ble firmware for your iot device

I'm a full-time embedded engineer building BLE-connected hardware products day-to-day. ESP32 and Nordic nRF52 are my daily tools. I write firmware that ships in real products, not just demo code that works once on a workbench.

What I build:

• Sensor data acquisition with proper calibration and filtering
• Custom BLE GATT services + advertising packets, designed for clean mobile app integration
• Low-power firmware with deep sleep, wake-on-event, battery optimization
• OTA firmware update support (Nordic DFU or ESP32 OTA)
• Robust error handling: sensor disconnect, BLE drop, retry logic, watchdog

What you get:

• Source code (Arduino, ESP-IDF, or nRF Connect SDK your choice)
• Clean, well-commented code your team can maintain
• BLE GATT specification document for your app developer
• Setup guide: how to flash, configure, and verify the firmware
• 30-min handoff call (Standard and Premium tiers)

Hardware I work with: ESP32 family (S3, C3, classic), Nordic nRF52 series. Sensors: I2C/SPI sensors, IMUs (ICM-42688, BMI270), environmental (BME280, SHT4x), pH/EC/optical, GPS, custom analog front-ends.

Send me before you order: Your hardware spec or schematic, list of sensors, target battery life