sensor/patchedBLE/examples/BLE_write/BLE_write.ino


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/*
    Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleWrite.cpp
    Ported to Arduino ESP32 by Evandro Copercini
*/
 
#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>
 
// 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 MyCallbacks: public BLECharacteristicCallbacks {
    void onWrite(BLECharacteristic *pCharacteristic) {
      std::string value = pCharacteristic->getValue();
 
      if (value.length() > 0) {
        Serial.println("*********");
        Serial.print("New value: ");
        for (int i = 0; i < value.length(); i++)
          Serial.print(value[i]);
 
        Serial.println();
        Serial.println("*********");
      }
    }
};
 
void setup() {
  Serial.begin(115200);
 
  Serial.println("1- Download and install an BLE scanner app in your phone");
  Serial.println("2- Scan for BLE devices in the app");
  Serial.println("3- Connect to MyESP32");
  Serial.println("4- Go to CUSTOM CHARACTERISTIC in CUSTOM SERVICE and write something");
  Serial.println("5- See the magic =)");
 
  BLEDevice::init("MyESP32");
  BLEServer *pServer = BLEDevice::createServer();
 
  BLEService *pService = pServer->createService(SERVICE_UUID);
 
  BLECharacteristic *pCharacteristic = pService->createCharacteristic(
                                         CHARACTERISTIC_UUID,
                                         BLECharacteristic::PROPERTY_READ |
                                         BLECharacteristic::PROPERTY_WRITE
                                       );
 
  pCharacteristic->setCallbacks(new MyCallbacks());
 
  pCharacteristic->setValue("Hello World");
  pService->start();
 
  BLEAdvertising *pAdvertising = pServer->getAdvertising();
  pAdvertising->start();
}
 
void loop() {
  // put your main code here, to run repeatedly: 
  delay(2000);
}