This is a sample to show how to create connection between ESP32 and nRF51822. In this sample, when ESP32 write to string "on"/"off" to the characteristic "6e400002-b5a3-f393-e0a9-e50e24dcca9e", which proviced by nRF51, the nRF51 device will turn on/off the LED on board.
The basic service UUID provided by the nRF51 device is 6e400001-b5a3-f393-e0a9-e50e24dcca9e
The project is built with Keil uVersion4. You can find the Keil project file
within the following directory: examples\ble_peripheral\ble_app_uart\pca10028\s110\arm4