I have compiled the ble_app_uart sdk the nRF51 SDK_v5.2.0.39364. (see attached file) and I upload this app to my device using OTA .
I found it can work with my Android device but not the iOS device. I use nRF UART app on both android and iOS device
the message from iOS nRF UART is
- It can find the device
- It connect the device
- It disconnect the device immediately
FM