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Provisioning Library

Provisioning library provides mechanism to send network credentials and/or custom data to an ESP32 or ESP32-S2 or ESP8266 devices.
This repository contains the source code for the companion Android app for this provisioning mechanism.

Features

  • Search for available BLE devices.
  • Scan device QR code to provide reference to ESP device.
  • Create reference of ESPDevice manually.
  • Data Encryption
  • Data transmission through BLE and SoftAP.
  • Scan for available Wi-Fi networks.
  • Provision device.
  • Scan for available Wi-Fi networks.
  • Support for exchanging custom data.

Requirements

  • Supports Android 6.0 (API level 23) and above.

How to include

Add this in your root build.gradle at the end of repositories:

allprojects {
    repositories {
   	 ...
   	 maven { url 'https://jitpack.io' }
    }
}

And add a dependency code to your app module's build.gradle file.

 implementation 'com.github.espressif:esp-idf-provisioning-android:lib-2.0.8'

Using Provisioning Library

Introduction

Provisioning library provides a simpler mechanism to communicate with an ESP-32, ESP32-S2 and ESP8266 devices. It gives an efficient search and scan model to listen and return devices which are in provisioning mode. It embeds security protocol and allow for safe transmission of data by doing end to end encryption. It supports BLE and SoftAP as mode of transmission which are configurable at runtime. Its primarily use is to provide home network credentials to a device and ensure device connectivity status is returned to the application.

Getting ESPDevice

ESPDevice object is virtual representation of ESP-32/ESP32-S2/ESP8266 devices. It provides interface to interact with devices directly in a simpler manner. ESPProvisionManager is a singleton class that encompasses APIs for searching ESP devices using BLE or SoftAP transport. Once app has received ESPDevice instance, app can maintain it for other API calls or it can receive same ESPDevice instance by calling API getEspDevice() of ESPProvisionManager class.

ESPDevice instances can be obtained from two ways as described following :

QR Code Scan

Device information can be extracted from scanning valid QR code. API returns single ESPDevice instance on success. It supports both SoftAP and BLE. If your device does not have QR code, you can use any online QR code generator. QR code payload is a JSON string representing a dictionary with key value pairs listed in the table below. An example payload : {"ver":"v1","name":"PROV_CE03C0","pop":"abcd1234","transport":"softap"}

Payload information :

Key Detail Values Required
ver Version of the QR code. Currently, it must be v1. Yes
name Name of the device. PROV_XXXXXX Yes
pop Proof of possession. POP value of the device like abcd1234 Optional. Considered empty string if not available in QR code data.
transport Wi-Fi provisioning transport type. It can be softap or ble. Yes
security Security for device communication. It can be 0 or 1 int value. Optional. Considered Sec1 if not available in QR code data.
password Password of SoftAP device. Password to connect with SoftAP device. Optional

In provisioning library, there are two options for QR code scanning API.

  1. User of this API decides the camera preview layer frame by providing CameraSourcePreview as parameter.

    Include CameraSourcePreview in your layout file.

    <com.espressif.provisioning.CameraSourcePreview
	android:id="@+id/preview"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	/>

    Provide this CameraSourcePreview instance to below API.

     ESPProvisionManager.getInstance(context).scanQRCode(Activity activityContext, CameraSourcePreview cameraSourcePreview, QRCodeScanListener qrCodeScanListener)

  2. User of this API needs to provide CodeScanner. For providing `CodeScanner' following things to be added in app.

    Add dependency in your app/build.gradle.

    implementation 'com.budiyev.android:code-scanner:2.1.0'

    Include CodeScannerView in your layout file.

    <com.budiyev.android.codescanner.CodeScannerView  
	android:id="@+id/scanner_view"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	app:autoFocusButtonColor="@android:color/white"
	app:autoFocusButtonVisible="false"
	app:flashButtonColor="@android:color/white"
	app:flashButtonVisible="false"
	app:frameColor="@android:color/white"
	app:frameCornersSize="50dp"
	app:frameCornersRadius="0dp"
	app:frameAspectRatioWidth="1"
	app:frameAspectRatioHeight="1"
	app:frameSize="0.75"
	app:frameThickness="2dp"
	app:maskColor="#77000000"/>

    Provide this CodeScanner instance to below API.

    ESPProvisionManager.getInstance(context).scanQRCode(CodeScanner codeScanner, QRCodeScanListener qrCodeScanListener)

Manually Create ESPDevice

ESPDevice can be also created by passing necessary parameters as argument of below function.

ESPProvisionManager.getInstance(context).createESPDevice(TransportType transportType, SecurityType securityType);

This will return ESPDevice with given transport and security type. For manually creating ESPDevice flow, after creating ESPDevice instance, app also needs to call connect API as described below.

  1. For BLE Transport : For BLE transport type, library will need BluetoothDevice to connect with actual device. To get BluetoothDevice app can call search API or also app can use own BLE scanning. Library supports searching of BLE devices which are currently in provisioning mode. It returns list of devices that are discoverable and matches the parameter criteria. This API will return BluetoothDevice objects for the devices found in BLE scan with given prefix.

    ESPProvisionManager.getInstance(context).searchBleEspDevices(String prefix, BleScanListener bleScannerListener)

    After user select BLE device, app can call connect API. Primary service UUID will also require to call connect API. App can get that from ScanResult.

    espDevice.connectBLEDevice(BluetoothDevice bluetoothDevice, String primaryServiceUuid)

  2. For SoftAP Transport : For SoftAP transport type, app can call connect API to connect with the device.

    espDevice.connectWiFiDevice()

For both transport app can listen device connected / disconnected events by registering for events.

Provisioning

The main feature of Provisioning library is to provision ESP devices. Once we get instance of ESPDevice from above APIs we need to establish session with the device before we can transmit/receive data from it. After receiving device connected event, app can get device capabilities and also set Proof of possession if device has pop capability.

After that application can proceed to scan list of available networks visible to device. This list can be used to give option to the user to choose network of their own choice.

  
espDevice.scanNetworks(final WiFiScanListener wifiScanListener);

User can choose to apply Wi-Fi settings from the above list or choose other Wi-Fi network to provision the device.

  
espDevice.provision(final String ssid, final String passphrase, final ProvisionListener provisionListener);

Other Configuration

Enable / Disable QR code support

QR code support can be enable/disable by setting true/false value of isQrCodeSupported filed available in app/build.gradle.

License

Copyright 2020 Espressif Systems (Shanghai) PTE LTD  
 
Licensed under the Apache License, Version 2.0 (the "License");  
you may not use this file except in compliance with the License.  
You may obtain a copy of the License at  
 
    http://www.apache.org/licenses/LICENSE-2.0  
 
Unless required by applicable law or agreed to in writing, software  
distributed under the License is distributed on an "AS IS" BASIS,  
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  
See the License for the specific language governing permissions and  
limitations under the License.