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@elktros
Created March 24, 2021 13:42
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ESP32 BLE Server for connecting with Smartphone.
#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 ESP32-BLE_Server");
Serial.println("4- Go to CUSTOM CHARACTERISTIC in CUSTOM SERVICE and write something");
Serial.println("5- See the magic =)");
BLEDevice::init("ESP32-BLE-Server");
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()
{
delay(2000);
}
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