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DavidHenn1988's questions

Martin Hope
DavidHenn1988
Asked: 2023-08-18 07:20:31 +0800 CST
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我使用以下代码通过 BLE 在 ESP32 上使用智能手机切换两个继电器。该代码到目前为止有效，但我只能将一部智能手机连接到 ESP32，一旦连接，其他智能手机就不再可见 ESP32 - 只有当我断开第一部智能手机的连接时，ESP32 才再次可见，另一部智能手机也可见可以重新连接。

因此我有以下问题：

  1. 多部智能手机可以同时通过蓝牙连接到 ESP32 吗？

  2. 如果没有，当新智能手机想要连接 ESP32 时，与之前智能手机的连接是否会被中断？

这是我当前的代码：

#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>

// Relais-Pins
const int relay1Pin = 18; // GPIO 18
const int relay2Pin = 19; // GPIO 19

BLEServer *pServer = NULL;
BLECharacteristic *pCharacteristic = NULL;
bool relay1State = false;
bool relay2State = false;

class MyServerCallbacks : public BLEServerCallbacks {
  void onConnect(BLEServer *pServer) {
    // Handle connection
  }

  void onDisconnect(BLEServer *pServer) {
    // Handle disconnection
    BLEDevice::startAdvertising(); // Start advertising to allow reconnection
  }
};

class MyCallbacks : public BLECharacteristicCallbacks {
  void onWrite(BLECharacteristic *pCharacteristic) {
    std::string value = pCharacteristic->getValue();

    if (value.length() > 0) {
      if (value[0] == '1') {
        digitalWrite(relay1Pin, true);
        delay(500);
        digitalWrite(relay1Pin, false);
      } else if (value[0] == '2') {
        digitalWrite(relay2Pin, true);
        delay(500);
        digitalWrite(relay2Pin, false);
      }
    }
  }
};

void setup() {
  pinMode(relay1Pin, OUTPUT);
  pinMode(relay2Pin, OUTPUT);
  digitalWrite(relay1Pin, relay1State);
  digitalWrite(relay2Pin, relay2State);

  BLEDevice::init("ESP32_Relay_Control");
  pServer = BLEDevice::createServer();
  pServer->setCallbacks(new MyServerCallbacks());

  BLEService *pService = pServer->createService(BLEUUID("0000FFFF-0000-1000-8000-00805F9B34FB"));

  pCharacteristic = pService->createCharacteristic(
      BLEUUID("0000FF01-0000-1000-8000-00805F9B34FB"),
      BLECharacteristic::PROPERTY_READ | BLECharacteristic::PROPERTY_WRITE
  );

  pCharacteristic->setCallbacks(new MyCallbacks());

  pService->start();

  BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
  pAdvertising->addServiceUUID(pService->getUUID());
  pAdvertising->start();
}

void loop() {
}
bluetooth