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test_bluetooth.ino
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test_bluetooth.ino
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#include <NimBLEDevice.h>
#include <NimBLEUtils.h>
#include <NimBLEServer.h>
BLEServer *pServer = NULL;
BLECharacteristic *pCharacteristic = NULL;
bool deviceConnected = false;
int txValue = 0;
#define SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
#define CHARACTERISTIC_UUID_RX "beb5483e-36e1-4688-b7f5-ea07361b26a8"
class MyServerCallbacks : public NimBLEServerCallbacks {
void onConnect(NimBLEServer *pServer) {
deviceConnected = true;
Serial.println("Device connected");
}
void onDisconnect(NimBLEServer *pServer) {
deviceConnected = false;
Serial.println("Device disconnected");
}
};
class MyCallbacks : public NimBLECharacteristicCallbacks {
void onWrite(NimBLECharacteristic *pCharacteristic) {
std::string rxValue = pCharacteristic->getValue();
if (rxValue.length() > 0) {
Serial.print("Received Value: ");
Serial.println(rxValue.c_str());
// Forward the received value to Arduino Mega if needed
Serial2.println(rxValue.c_str());
}
}
};
void setup() {
Serial.begin(115200);
NimBLEDevice::init("PEANUT");
pServer = NimBLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
NimBLEService *pService = pServer->createService(SERVICE_UUID);
pCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID_RX,
NIMBLE_PROPERTY::WRITE | NIMBLE_PROPERTY::NOTIFY);
pCharacteristic->setCallbacks(new MyCallbacks());
pService->start();
NimBLEAdvertising *pAdvertising = pServer->getAdvertising();
pAdvertising->start();
Serial.println("Waiting for a client connection to notify...");
}
void loop() {
if (deviceConnected) {
pCharacteristic->setValue("Hello from ESP32");
pCharacteristic->notify();
delay(1000);
}
}