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Eric
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ESP32 | FLUTER | BLE | Local Notifications
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‎Esp32_Flutter_BLE_LocalNoti/ESP32_ble_server/ESP32_ble_server.ino

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/*
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Video: https://www.youtube.com/watch?v=oCMOYS71NIU
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Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleNotify.cpp
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Ported to Arduino ESP32 by Evandro Copercini
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updated by chegewara
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Create a BLE server that, once we receive a connection, will send periodic notifications.
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The service advertises itself as: 4fafc201-1fb5-459e-8fcc-c5c9c331914b
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And has a characteristic of: beb5483e-36e1-4688-b7f5-ea07361b26a8
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The design of creating the BLE server is:
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1. Create a BLE Server
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2. Create a BLE Service
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3. Create a BLE Characteristic on the Service
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4. Create a BLE Descriptor on the characteristic
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5. Start the service.
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6. Start advertising.
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A connect hander associated with the server starts a background task that performs notification
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every couple of seconds.
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*/
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#include <BLEDevice.h>
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#include <BLEServer.h>
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#include <BLEUtils.h>
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#include <BLE2902.h>
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BLEServer* pServer = NULL;
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BLECharacteristic* pCharacteristic = NULL;
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bool deviceConnected = false;
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bool oldDeviceConnected = false;
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uint32_t value = 0;
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// See the following for generating UUIDs:
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// https://www.uuidgenerator.net/
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#define SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
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#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"
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class MyServerCallbacks: public BLEServerCallbacks {
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void onConnect(BLEServer* pServer) {
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deviceConnected = true;
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BLEDevice::startAdvertising();
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};
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void onDisconnect(BLEServer* pServer) {
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deviceConnected = false;
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}
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};
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void setup() {
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Serial.begin(115200);
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// Create the BLE Device
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BLEDevice::init("ESP32 THAT PROJECT");
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// Create the BLE Server
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pServer = BLEDevice::createServer();
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pServer->setCallbacks(new MyServerCallbacks());
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// Create the BLE Service
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BLEService *pService = pServer->createService(SERVICE_UUID);
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// Create a BLE Characteristic
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pCharacteristic = pService->createCharacteristic(
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CHARACTERISTIC_UUID,
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BLECharacteristic::PROPERTY_READ |
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BLECharacteristic::PROPERTY_WRITE |
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BLECharacteristic::PROPERTY_NOTIFY |
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BLECharacteristic::PROPERTY_INDICATE
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);
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// https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml
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// Create a BLE Descriptor
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pCharacteristic->addDescriptor(new BLE2902());
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// Start the service
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pService->start();
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// Start advertising
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BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
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pAdvertising->addServiceUUID(SERVICE_UUID);
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pAdvertising->setScanResponse(false);
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pAdvertising->setMinPreferred(0x0); // set value to 0x00 to not advertise this parameter
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BLEDevice::startAdvertising();
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Serial.println("Waiting a client connection to notify...");
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}
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void loop() {
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// notify changed value
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if (deviceConnected) {
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pCharacteristic->setValue((uint8_t*)&value, 4);
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pCharacteristic->notify();
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value++;
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delay(500); // bluetooth stack will go into congestion, if too many packets are sent, in 6 hours test i was able to go as low as 3ms
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}
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// disconnecting
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if (!deviceConnected && oldDeviceConnected) {
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delay(500); // give the bluetooth stack the chance to get things ready
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pServer->startAdvertising(); // restart advertising
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Serial.println("start advertising");
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oldDeviceConnected = deviceConnected;
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}
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// connecting
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if (deviceConnected && !oldDeviceConnected) {
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// do stuff here on connecting
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oldDeviceConnected = deviceConnected;
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}
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}

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/.gitignore

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# Miscellaneous
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*.class
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*.log
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*.pyc
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*.swp
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.DS_Store
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.atom/
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.buildlog/
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.history
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.svn/
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# IntelliJ related
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*.iml
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*.ipr
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*.iws
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.idea/
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# The .vscode folder contains launch configuration and tasks you configure in
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# VS Code which you may wish to be included in version control, so this line
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# is commented out by default.
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#.vscode/
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# Flutter/Dart/Pub related
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**/doc/api/
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.dart_tool/
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.flutter-plugins
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.packages
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.pub-cache/
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.pub/
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/build/
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# Android related
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**/android/**/gradle-wrapper.jar
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**/android/.gradle
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**/android/captures/
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**/android/gradlew
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**/android/gradlew.bat
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**/android/local.properties
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**/android/**/GeneratedPluginRegistrant.java
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# iOS/XCode related
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**/ios/**/*.mode1v3
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**/ios/**/*.mode2v3
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**/ios/**/*.moved-aside
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**/ios/**/*.pbxuser
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**/ios/**/*.perspectivev3
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**/ios/**/*sync/
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**/ios/**/.sconsign.dblite
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**/ios/**/.tags*
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**/ios/**/.vagrant/
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**/ios/**/DerivedData/
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**/ios/**/Icon?
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**/ios/**/Pods/
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**/ios/**/.symlinks/
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**/ios/**/profile
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**/ios/**/xcuserdata
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**/ios/.generated/
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**/ios/Flutter/App.framework
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**/ios/Flutter/Flutter.framework
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**/ios/Flutter/Generated.xcconfig
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**/ios/Flutter/app.flx
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**/ios/Flutter/app.zip
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**/ios/Flutter/flutter_assets/
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**/ios/ServiceDefinitions.json
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**/ios/Runner/GeneratedPluginRegistrant.*
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# Exceptions to above rules.
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!**/ios/**/default.mode1v3
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!**/ios/**/default.mode2v3
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!**/ios/**/default.pbxuser
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!**/ios/**/default.perspectivev3
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!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/.metadata

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# This file tracks properties of this Flutter project.
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# Used by Flutter tool to assess capabilities and perform upgrades etc.
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#
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# This file should be version controlled and should not be manually edited.
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version:
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revision: 954714c9674af0da6530795407fc66179fdaef88
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channel: dev
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project_type: app

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/Pods

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ios/Pods

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/README.md

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# flutter_blue_localnotify
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A new Flutter application.
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## Getting Started
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This project is a starting point for a Flutter application.
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A few resources to get you started if this is your first Flutter project:
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- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
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- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
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For help getting started with Flutter, view our
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[online documentation](https://flutter.dev/docs), which offers tutorials,
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samples, guidance on mobile development, and a full API reference.

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/build.gradle

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def localProperties = new Properties()
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def localPropertiesFile = rootProject.file('local.properties')
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if (localPropertiesFile.exists()) {
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localPropertiesFile.withReader('UTF-8') { reader ->
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localProperties.load(reader)
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}
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}
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def flutterRoot = localProperties.getProperty('flutter.sdk')
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if (flutterRoot == null) {
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throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
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}
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def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
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if (flutterVersionCode == null) {
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flutterVersionCode = '1'
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}
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def flutterVersionName = localProperties.getProperty('flutter.versionName')
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if (flutterVersionName == null) {
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flutterVersionName = '1.0'
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}
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apply plugin: 'com.android.application'
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apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
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android {
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compileSdkVersion 28
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lintOptions {
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disable 'InvalidPackage'
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}
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defaultConfig {
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// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
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applicationId "com.thatproject.flutter_blue_localnotify"
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minSdkVersion 19
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targetSdkVersion 28
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versionCode flutterVersionCode.toInteger()
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versionName flutterVersionName
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testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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release {
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// TODO: Add your own signing config for the release build.
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// Signing with the debug keys for now, so `flutter run --release` works.
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signingConfig signingConfigs.debug
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}
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}
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}
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flutter {
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source '../..'
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}
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dependencies {
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testImplementation 'junit:junit:4.12'
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androidTestImplementation 'androidx.test:runner:1.1.1'
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androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
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}

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/src/debug/AndroidManifest.xml

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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.thatproject.flutter_blue_localnotify">
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<!-- Flutter needs it to communicate with the running application
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to allow setting breakpoints, to provide hot reload, etc.
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-->
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<uses-permission android:name="android.permission.INTERNET"/>
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</manifest>

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/src/main/AndroidManifest.xml

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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.thatproject.flutter_blue_localnotify">
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<!-- io.flutter.app.FlutterApplication is an android.app.Application that
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calls FlutterMain.startInitialization(this); in its onCreate method.
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In most cases you can leave this as-is, but you if you want to provide
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additional functionality it is fine to subclass or reimplement
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FlutterApplication and put your custom class here. -->
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<application
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android:name="io.flutter.app.FlutterApplication"
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android:label="flutter_blue_localnotify"
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android:icon="@mipmap/ic_launcher">
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<activity
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android:name=".MainActivity"
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android:launchMode="singleTop"
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android:theme="@style/LaunchTheme"
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android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
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android:hardwareAccelerated="true"
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android:windowSoftInputMode="adjustResize">
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<!-- This keeps the window background of the activity showing
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until Flutter renders its first frame. It can be removed if
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there is no splash screen (such as the default splash screen
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defined in @style/LaunchTheme). -->
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<meta-data
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android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
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android:value="true" />
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<intent-filter>
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<action android:name="android.intent.action.MAIN"/>
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<category android:name="android.intent.category.LAUNCHER"/>
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/src/main/java/com/thatproject/flutter_blue_localnotify/MainActivity.java

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package com.thatproject.flutter_blue_localnotify;
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import android.os.Bundle;
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import io.flutter.app.FlutterActivity;
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import io.flutter.plugins.GeneratedPluginRegistrant;
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public class MainActivity extends FlutterActivity {
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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GeneratedPluginRegistrant.registerWith(this);
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}
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}

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/src/main/res/drawable/app_icon.png

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‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/src/main/res/drawable/launch_background.xml

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<?xml version="1.0" encoding="utf-8"?>
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<!-- Modify this file to customize your launch splash screen -->
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<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
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<item android:drawable="@android:color/white" />
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<!-- You can insert your own image assets here -->
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<!-- <item>
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<bitmap
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android:gravity="center"
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android:src="@mipmap/launch_image" />
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</item> -->
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</layer-list>

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/src/main/res/mipmap-hdpi/ic_launcher.png

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‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/src/main/res/mipmap-mdpi/ic_launcher.png

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‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png

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‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png

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‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png

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‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/src/main/res/values/styles.xml

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<?xml version="1.0" encoding="utf-8"?>
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<resources>
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<style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
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<!-- Show a splash screen on the activity. Automatically removed when
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Flutter draws its first frame -->
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<item name="android:windowBackground">@drawable/launch_background</item>
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</style>
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</resources>

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/app/src/profile/AndroidManifest.xml

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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.thatproject.flutter_blue_localnotify">
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<!-- Flutter needs it to communicate with the running application
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to allow setting breakpoints, to provide hot reload, etc.
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-->
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<uses-permission android:name="android.permission.INTERNET"/>
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</manifest>

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/build.gradle

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buildscript {
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repositories {
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google()
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jcenter()
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}
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dependencies {
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classpath 'com.android.tools.build:gradle:3.2.1'
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}
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}
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allprojects {
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repositories {
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google()
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jcenter()
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}
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}
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rootProject.buildDir = '../build'
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subprojects {
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project.buildDir = "${rootProject.buildDir}/${project.name}"
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}
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subprojects {
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project.evaluationDependsOn(':app')
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}
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task clean(type: Delete) {
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delete rootProject.buildDir
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}

‎Esp32_Flutter_BLE_LocalNoti/flutter_blue_localnotify/android/gradle.properties

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org.gradle.jvmargs=-Xmx1536M
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android.useAndroidX=true
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android.enableJetifier=true

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