Sylvania A19 智能灯泡 + ESP32C3 Micro BLE 连接/写入问题

Question

我刚刚收到 ESP32C3 微控制器，只有一个智能灯泡可供学习。我先写了BLE扫描代码，找到了灯泡。打印连接所需的 UUID 和地址。它无法连接，但我开始认为服务 UUID 是错误的。我手机上的 BLE 扫描仪显示 7 个左右的服务。其中只有 2 个允许写入。这是我的代码。任何帮助将不胜感激。

#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEScan.h>
#include <BLEAdvertisedDevice.h>
#include <BLEClient.h>
#include <BLEAddress.h>
#include <BLEHIDDevice.h>

// The BLE scan duration in seconds
#define BLE_SCAN_DURATION 5

// The MAC address of the Sylvania Smart+ bulb
#define SYLVANIA_SMART_BULB_ADDRESS "CHANGE ME"

// The service UUID and characteristic UUID of the Sylvania Smart+ bulb
#define SYLVANIA_SMART_BULB_SERVICE_UUID "CHANGE ME"
#define SYLVANIA_SMART_BULB_CHARACTERISTIC_UUID "CHANGE ME"

// Function to handle the BLE scan results
class MyAdvertisedDeviceCallbacks : public BLEAdvertisedDeviceCallbacks {
public:
  void onResult(BLEAdvertisedDevice advertisedDevice) {
    
      // Print the MAC address, service UUID, and characteristic UUID of the smart bulb
      Serial.printf("Found smart bulb: %s\n", advertisedDevice.getAddress().toString().c_str());
      Serial.printf("Service UUID: %s\n", advertisedDevice.getServiceUUID().toString().c_str());
      Serial.printf("Characteristic UUID: %s\n", advertisedDevice.getServiceDataUUID().toString().c_str());

      // Check if the smart bulb is the Sylvania Smart+ bulb
      if (advertisedDevice.getAddress().toString() == SYLVANIA_SMART_BULB_ADDRESS) {
        // Connect to the Sylvania Smart+ bulb
        BLEClient* pClient = BLEDevice::createClient();
        BLEAddress bulbAddress(SYLVANIA_SMART_BULB_ADDRESS);
        pClient->connect(bulbAddress);

        // Get the service and characteristic of the Sylvania Smart+ bulb
        BLERemoteService* pService = pClient->getService(SYLVANIA_SMART_BULB_SERVICE_UUID);
        BLERemoteCharacteristic* pCharacteristic = pService->getCharacteristic(SYLVANIA_SMART_BULB_CHARACTERISTIC_UUID);

        // Turn off the Sylvania Smart+ bulb
        pCharacteristic->writeValue("00 00 00 00 00 00");

        // Disconnect from the Sylvania Smart+ bulb
        pClient->disconnect();
      }
    }
};

void setup() {
  Serial.begin(115200);

  // Initialize the BLE device
  BLEDevice::init("");

  // Start the BLE scan
  BLEScan* pScan = BLEDevice::getScan();
  pScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pScan->setActiveScan(true);
  pScan->start(BLE_SCAN_DURATION);
}

void loop() {
  // Do nothing in the loop
}

我尝试用我的 BLE 扫描仪应用程序编写 \Off \OFF \off 00 00 00 00 00 00 等，但仍然没有乐趣。

无论如何我仍然无法连接，所以这是一个两步问题。

Answer 1

您关闭灯泡的命令似乎格式错误。

pCharacteristic->writeValue("00 00 00 00 00 00");  <--- seems wrong

我查看了

writeValue()

方法的签名（如 BLERemoteCharacteristic 类中定义），看来您不应该发送一串十六进制值。

可用的签名有：

void BLERemoteCharacteristic::writeValue(std::string newValue, bool response)
void BLERemoteCharacteristic::writeValue(uint8_t newValue, bool response)
void BLERemoteCharacteristic::writeValue(uint8_t* data, size_t length, bool response)

并且 std::string 版本应该使用 实际数据 作为字符串。

假设你想发送6个零字节来关闭它，你可以这样做

uint8_t data[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
pCharacteristic->writeValue(data, 6, false);

虽然我找不到任何详细说明 Sylvania Smart+ 灯泡接受哪些命令的资源。