FreeRTOS BLE Mobile SDK for Android

Introduction

Using the Android SDK for FreeRTOS Bluetooth Devices, you can create mobile applications that do the following:

• Scan for and connect to nearby BLE devices running FreeRTOS

• Perform WiFi provisioning of the FreeRTOS BLE devices after connecting to them ( Only supported for Espressif ESP32-DevKitC )

• Act as a proxy for transmitting MQTT messages between a device running FreeRTOS and the AWS IoT cloud

System requirements

• Android 6.0 (API level 23) or higher

• Bluetooth 4.2 or higher

• Android Studio

Setting Up the SDK

1. Set the SDK as a dependency for the application.

Option 1: install from maven In your app's build.gradle file, add the following into dependencies block: (replace x.y.z with )

    implementation('software.amazon.freertos:amazonfreertossdk:x.y.z')

Option 2: Build the sdk locally. In your app's build.gradle file, add the following into dependencies block:

    implementation project(':amazonfreertossdk')

In project's settings.gradle file, add ':amazonfreertossdk'

    include ':app', ':amazonfreertossdk'

2. In your app's AndroidManifest.xml file, add following permissions:

<uses-permission android:name="android.permission.BLUETOOTH"/>
    <!-- initiate device discovery and manipulate bluetooth settings -->
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
    <!-- allow scan BLE -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <!-- AWS Mobile SDK -->
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

3. Turn on phone's Location Services.

In addition to adding location permissions, this is required by android to perform a successful BLE scan.

Contents

BLE Helper Functions

The SDK includes some functions that help you perform BLE operations with FreeRTOS devices:

    startScanDevices
    stopScanDevices
    connectToDevice
    disconnectFromDevice

Once the connection to the device is established, you get an AmazonFreeRTOSDevice object, and you can use this object to do WiFi provisioning or Mqtt proxy.

WiFi Provisioning Service

Provision the WiFi credential on the FreeRTOS device through the app. It provides 4 functions:

    ListNetwork
    SaveNetwork
    EditNetwork
    DeleteNetwork

MQTT Proxy Service

The MQTT proxy service controls the MQTT proxy. It allows the device to send and receive MQTT messages from the AWS IoT cloud through the phone, when this feature is enabled.

You can find the API documentation for these functions in the docs directory of this repository and on github pages.

Demo Application

The SDK includes a demo application that demonstrates some of the main features of the SDK. You can find the demo in app.

License

This library is licensed under the Apache 2.0 License.