Control / Monitor a device by Mobile via BLE with the VBLUno51 board of VNG IoT Lab Function Control: Mobile --> VBLUno51 (Write action): Turn LED On/Off Monitor: Mobile <-- VBLUno51 (Notify action): When press button on VBLUno51, plus 1 and send to Mobile Design BLE Service Firmware for the VBLUno51 board Arduino IDE: see firmware_vbluno51 directory Android application Android Studio: see android directory Demo Image