ESP32 BLE Arduino：BLERemoteCharacteristic 的 writeValue 方法使 ESP 挂起

Question

使用连接到 Arduino IDE 的 ESP32 BLE，我现在尝试通过向 Apple 通知中心服务的控制点 (ANCS) 发送命令来获取通知属性。这是代码

static void NotificationSourceNotifyCallback(
  BLERemoteCharacteristic* pNotificationSourceCharacteristic,
  uint8_t* pData,
  size_t length,
  bool isNotify)
{
    // Serial.print("Notification Source callback for characteristic ");
    // Serial.print(pNotificationSourceCharacteristic->getUUID().toString().c_str());
    // Serial.println();

    // Check if this is a "new notification" event
    if(pData[0] == 0) {
        for (size_t i = 0; i < length; i++) {
            Serial.print("0x");
            if (pData[i] < 0x10) {
                Serial.print("0");  // Add leading zero for single-digit hex
            }
            Serial.print(pData[i], HEX);  // Print as hexadecimal
            Serial.print(" ");
        }
        Serial.println();
        Serial.println("New notification!");

        uint32_t notificationUID = 0;
        notificationUID |= pData[4] << 24;  // Most significant byte
        notificationUID |= pData[5] << 16;
        notificationUID |= pData[6] << 8;
        notificationUID |= pData[7];  // Least significant byte

        // Print the NotificationUID
        Serial.print("Notification UID: ");
        Serial.println(notificationUID, DEC);

        // Print the category of the notification
        Serial.print("  Category: ");
        switch(pData[2]) {
            case 0: Serial.println("Other"); break;
            case 1: Serial.println("Incoming call"); break;
            case 2: Serial.println("Missed call"); break;
            case 3: Serial.println("Voicemail"); break;
            case 4: Serial.println("Social"); break;
            case 5: Serial.println("Schedule"); break;
            case 6: Serial.println("Email"); break;
            case 7: Serial.println("News"); break;
            case 8: Serial.println("Health"); break;
            case 9: Serial.println("Business"); break;
            case 10: Serial.println("Location"); break;
            case 11: Serial.println("Entertainment"); break;
            default: break;
        }

        // Create the Get Notification Attributes command
        uint8_t notificationAttributesCommand[] = {
            0x00,  // Command ID: Get Notification Attributes
            (uint8_t)(notificationUID >> 24),  // Notification UID (4 bytes)
            (uint8_t)(notificationUID >> 16),
            (uint8_t)(notificationUID >> 8),
            (uint8_t)(notificationUID),  // 32-bit Notification UID
            0x00  // Attribute IDs: App Identifier, Title, Message
        };

        // Send the command to the Control Point characteristic
        if (pControlPointCharacteristic != nullptr) {
              Serial.println("Sending Get Notification Attributes command to Control Point...");
              
              // Delay to ensure timing issues are not causing the hang
              delay(1000);
              Serial.println("After delaying 1s...");
              try {
                // pControlPointCharacteristic->writeValue(notificationAttributesCommand, sizeof(notificationAttributesCommand));
                // pControlPointCharacteristic->getDescriptor(BLEUUID("69D1D8F3-45E1-49A8-9821-9BBDFDAAD9D9"))->writeValue(notificationAttributesCommand, sizeof(notificationAttributesCommand),true);
                if(pControlPointCharacteristic->canWrite()) {
                  Serial.println("can write!");
                }
              } catch (...) {
                Serial.println("Not good");    
              }
              
              delay(1000);
              Serial.println("Write successful");

          } else {
              Serial.println("Control Point characteristic is null");
          }
    }

}

我尝试过：

pControlPointCharacteristic->writeValue(notificationAttributesCommand, sizeof(notificationAttributesCommand));

pControlPointCharacteristic->getDescriptor(BLEUUID("69D1D8F3-45E1-49A8-9821-9BBDFDAAD9D9"))->writeValue(notificationAttributesCommand, sizeof(notificationAttributesCommand),true);
                

它不起作用，导致我的 esp32 板挂起。我该怎么做才能向 ANCS 控制点发送命令并取回 iOS 通知的标题、消息？

谢谢你。

Answer 1

我弄清楚了是什么让我的 esp32 挂起：我调用了

pControlPointCharacteristic->writeValue(notificationAttributesCommand, sizeof(notificationAttributesCommand));

放错地方了。

我所做的是：引入一个新的标志变量并更改

NotificationSourceNotifyCallback

中的标志，然后在

writeValue

函数中执行

loop()

。

我仍然无法写入控制点特性，因为我遇到了另一个无效命令格式的错误（错误161或0xA1）

Invalid command (0xA1): The command was improperly formatted.
More info: under Error Codes section here:
https://developer.apple.com/library/archive/documentation/CoreBluetooth/Reference/AppleNotificationCenterServiceSpecification/Specification/Specification.html#//apple_ref/doc/uid/TP40013460-CH1-SW7