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Android BluetoothLeGatt Sample

This sample demonstrates how to use the Bluetooth LE Generic Attribute Profile (GATT) to transmit arbitrary data between devices.

Introduction

This sample shows a list of available Bluetooth LE devices and provides an interface to connect, display data and display GATT services and characteristics supported by the devices.

It creates a Service for managing connection and data communication with a GATT server hosted on a given Bluetooth LE device.

The Activities communicate with the Service, which in turn interacts with the Bluetooth LE API.

Pre-requisites

  • Android SDK 28
  • Android Build Tools v28.0.0
  • Android Support Repository

Getting Started

This sample uses the Gradle build system. To build this project, use the "gradlew build" command or use "Import Project" in Android Studio.

CardioCheck notes

This is a step by step guide to follow in order to connect to Bluetooth devices :

  • Create a class which handle BT search
  • In case BL is not enabled, ask user to enable it
  • In case we are looking for a BLE device, ask user to enable GPS (see EXTRA app implementation)
  • Launch search (or launch search at app launch)
  • Show found devices on list
  • Click on device to connect and bind it with six-digit passkey (given by manufacturer); ATTENTION: in Android code, while connecting to device there is a flag which enable automatic re-connection to device when found!
  • Collect raw info from device

Questions / possible issues :

  • is there any configuration to do before collecting data ? (AKA write / send info to medical device) ?
  • does data is deleted after collection on mobile device ?
  • data is encrypted and block chained: yay ?