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Diffstat (limited to 'examples/Arduino/BLE_notify/BLE_notify.ino')
| -rw-r--r-- | examples/Arduino/BLE_notify/BLE_notify.ino | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/examples/Arduino/BLE_notify/BLE_notify.ino b/examples/Arduino/BLE_notify/BLE_notify.ino new file mode 100644 index 0000000..44506c2 --- /dev/null +++ b/examples/Arduino/BLE_notify/BLE_notify.ino @@ -0,0 +1,93 @@ +/* + Video: https://www.youtube.com/watch?v=oCMOYS71NIU + Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleNotify.cpp + Ported to Arduino ESP32 by Evandro Copercini + + Create a BLE server that, once we receive a connection, will send periodic notifications. + The service advertises itself as: 4fafc201-1fb5-459e-8fcc-c5c9c331914b + And has a characteristic of: beb5483e-36e1-4688-b7f5-ea07361b26a8 + + The design of creating the BLE server is: + 1. Create a BLE Server + 2. Create a BLE Service + 3. Create a BLE Characteristic on the Service + 4. Create a BLE Descriptor on the characteristic + 5. Start the service. + 6. Start advertising. + + A connect hander associated with the server starts a background task that performs notification + every couple of seconds. +*/ +#include <BLEDevice.h> +#include <BLEServer.h> +#include <BLEUtils.h> +#include <BLE2902.h> + +BLECharacteristic *pCharacteristic; +bool deviceConnected = false; +uint8_t value = 0; + +// See the following for generating UUIDs: +// https://www.uuidgenerator.net/ + +#define SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b" +#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8" + + +class MyServerCallbacks: public BLEServerCallbacks { + void onConnect(BLEServer* pServer) { + deviceConnected = true; + }; + + void onDisconnect(BLEServer* pServer) { + deviceConnected = false; + } +}; + + + +void setup() { + Serial.begin(115200); + + // Create the BLE Device + BLEDevice::init("MyESP32"); + + // Create the BLE Server + BLEServer *pServer = new BLEServer(); + pServer->setCallbacks(new MyServerCallbacks()); + + // Create the BLE Service + BLEService *pService = pServer->createService(SERVICE_UUID); + + // Create a BLE Characteristic + pCharacteristic = pService->createCharacteristic( + CHARACTERISTIC_UUID, + BLECharacteristic::PROPERTY_READ | + BLECharacteristic::PROPERTY_WRITE | + BLECharacteristic::PROPERTY_NOTIFY | + BLECharacteristic::PROPERTY_INDICATE + ); + + // https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml + // Create a BLE Descriptor + pCharacteristic->addDescriptor(new BLE2902()); + + // Start the service + pService->start(); + + // Start advertising + pServer->getAdvertising()->start(); + Serial.println("Waiting a client connection to notify..."); +} + +void loop() { + + if (deviceConnected) { + Serial.printf("*** NOTIFY: %d ***\n", value); + pCharacteristic->setValue(&value, 1); + pCharacteristic->notify(); + //pCharacteristic->indicate(); + value++; + } + delay(2000); +}
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