React Native - BleManager.startNotification 不起作用

Question

我正在使用 React Native 和库“react-native-ble-manager”。到目前为止，我可以连接到硬件，向硬件发送一些命令，但我无法从硬件接收任何值，简单的 JSON 数据。我只是无法让 BleManager.startNotification 工作。 我的程序如下，我连接到 ble 设备，向 ble 设备发送命令，然后按下反应本机软件上的按钮接收数据后，我启动一个函数 handleReceiveData，请参阅下面的代码。

const handleReceiveData = async () => {
    // Find the connected peripheral you want to receive data from
    const connectedPeripheral = Array.from(peripherals.values()).find(
      p => p.connected,
    );

    if (!connectedPeripheral) {
      console.log('No connected peripheral found for receiving data');
      return;
    }

    try {
      await BleManager.retrieveServices(connectedPeripheral.id).then(
        peripheralInfo => {
          // Success code
          console.log('Peripheral info:', peripheralInfo);
        },
      );
      // Start notification on the characteristic
      await BleManager.startNotification(
        connectedPeripheral.id,
        SERVICE_UUID,
        CHARACTERISTIC_UUID,
      )
        .then(() => {
          console.log('Started notification on ' + CHARACTERISTIC_UUID);
        })
        .catch(error => {
          console.error('Notification error', error);
        });

      // Set up an event listener for when characteristic value updates
      bleManagerEmitter.addListener(
        'BleManagerDidUpdateValueForCharacteristic',
        ({value, peripheral, characteristic, service}) => {
          // Check if this is the right characteristic
          if (
            peripheral === connectedPeripheral.id &&
            characteristic === CHARACTERISTIC_UUID
          ) {
            // Convert bytes array to string
            const dataAsString = value
              .map((byte: number) => String.fromCharCode(byte))
              .join('');
            setReceivedData(dataAsString);
            console.log('Received data: ', dataAsString);
          }
        },
      );
    } catch (error) {
      console.error('Failed to set up data reception', error);
    }
  };

我收到的所有时间都为错误：

LOG Set notification failed for 6e400002-b5a3-f393-e0a9-e50e24dcca9e

我的 ble 设备工作正常。我使用“nRF Connect”应用程序测试了所有内容，这是包含接收到的数据的图片。

Answer 1

这个问题首先在OP的

交叉发布到GitHub上得到回答。在这里交叉发布答案：

在调用 startNotification 之前，我可以通过将 iOS 上已知的 128 位 UUID 压缩为其较短的 16 位版本来成功连接到我的蓝牙设备。

注：

此代码仅处理 16 位 UUID。根据 CBUUID 的文档（请参阅其他上下文），完整的解决方案似乎还需要支持 32 位 UUID

function compressUUID(uuid: string): string {
  // Bluetooth 4.0 specification, Volume 3, Part F, Section 3.2.1
  // https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=456433

  // Required since react-native-ble-manager needs short UUIDs for notifications on
  // iOS, so I need to be able to compare them to the full UUIDs known for my devices.
  
  // CBUUID (iOS):
  // https://developer.apple.com/documentation/corebluetooth/cbuuid
  // Source: https://github.com/innoveit/react-native-ble-manager/blob/f46dd5c303ea0e70a44e299fb1ebabff86da9edd/ios/BleManager.swift#L381-L385
  const baseUUID = /0000(....)-0000-1000-8000-00805F9B34FB/;
  if (baseUUID.test(uuid.toUpperCase())) {
    return uuid.substring(4, 8);
  } else {
    return uuid;
  }
}

BleManager.startNotification(
    "189fd3cb-fb2b-a6a6-b214-246d82f81298",
    compressUUID("0000aadb-0000-1000-8000-00805f9b34fb"),
    compressUUID("0000aadc-0000-1000-8000-00805f9b34fb"),
)