Scan and discover your Bluetooth low energy devices with nRF Connect for Mobile.
Bluetooth Low Energy(4.0) Scanner: Read,Write,Notify, Services & Characteristics
After you recognize the voice commands You can send a message MQTT. Switch also provides slide, keypad, text, and color control.
Arduino with an app created to connect to a brief chat with BLE. Also included are HTTP Request feature for IoT.
To connect the Arduino and Android phones can communicate with OTG cable. This app is a USB Host OTG cable for communication with the app.
Arduino and a simple chat app allows you to create and connect to Bluetooth. Also included are HTTP Request feature for IoT.