使用小米MiBand和BLE测量心率

Question

我正在尝试使用简单的sdk来与健身追踪器Xiaomi Mi Band一起工作.目前我可以跟踪步骤,启动振动,处理传感器触摸,但我有心率测量的问题.我的sdk基于https://github.com/pangliang/miband-sdk-android.为了测量心率,我需要将描述符写入适当的特征,以便在改变该特征的值时处理回调,然后将适当的数据写入心率控制点特征以直接启动心率测量过程.问题是,在启动此过程的数据成功写入特征后,心率测量过程未开始(当Mi Band开始测量心率时,底部传感器闪烁绿色).这可能是由健身追踪器的新固件(固件版本:4.15.12.10; HeartRate版本:1.3.74.64)引起的,或者我的代码中存在一些缺陷:

/-------- MiBandProfile --------/
public static final UUID UUID_SERVICE_HEARTRATE = UUID.fromString("0000180d-0000-1000-8000-00805f9b34fb");
public static final UUID UUID_NOTIFICATION_HEARTRATE = UUID.fromString("00002a37-0000-1000-8000-00805f9b34fb");
public static final UUID UUID_CHAR_HEARTRATE = UUID.fromString("00002a39-0000-1000-8000-00805f9b34fb");
public static final UUID UUID_DESCRIPTOR_UPDATE_NOTIFICATION = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");

/-------- MiBandProtocol --------/
public static final byte[] START_HEART_RATE_SCAN = {21, 1, 1};

/-------- BleProvider --------/
public class BleProvider extends BluetoothGattCallback {

public interface NotifyListener {
     void onNotify(byte[] data);
}

private HashMap<UUID, NotifyListener> mNotifyListeners = new HashMap<UUID, NotifyListener>();
.
.
.
public void setNotifyListener(UUID serviceUUID, UUID charaUUID, NotifyListener listener) {
        //enable chara notofication
        if (this.mGatt == null || !this.mIsServicesDiscovered) {
            if (DBG) Log.d(Debug.TAG, "Device is not connected or services are not discovered");
            return;
        }

        BluetoothGattCharacteristic chara = this.mGatt.getService(serviceUUID).getCharacteristic(charaUUID);

        if (DBG) Log.d(Debug.TAG, "setCharacteristicNotification: " + this.mGatt.setCharacteristicNotification(chara, true));
        BluetoothGattDescriptor descriptor = chara.getDescriptor(MiBandProfile.UUID_DESCRIPTOR_UPDATE_NOTIFICATION);
        if (DBG) Log.d(Debug.TAG, "setValue: " + descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE));
        if (DBG) Log.d(Debug.TAG, "writeDescriptor: " + this.mGatt.writeDescriptor(descriptor));
        this.mNotifyListeners.put(charaUUID, listener);
}

@Override
public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
        //this method must be called when the characteristic value was changed but nothing happened :(
        super.onCharacteristicChanged(gatt, characteristic);

        if (this.mNotifyListeners.containsKey(characteristic.getUuid())) {
            this.mNotifyListeners.get(characteristic.getUuid()).onNotify(characteristic.getValue());
        }
}
} //end BleProvider

.
.
.

setNotifyListener(MiBandProfile.UUID_SERVICE_HEARTRATE, MiBandProfile.UUID_NOTIFICATION_HEARTRATE, new BleProvider.NotifyListener(){...});
//waiting few seconds
writeCharacteristic(MiBandProfile.UUID_SERVICE_HEARTRATE, MiBandProfile.UUID_CHAR_HEARTRATE, MiBandProtocol.START_HEART_RATE_SCAN);

也许该协议已被弃用,并且有人可以与我分享新协议.我会很高兴的.谢谢.

Answer 1

我解决了这个问题!在调用setNotifyListener跟踪脉冲值的变化之前,您必须将用户信息(年龄,体重)写入适当的特征,因为没有这个Mi Band不会开始测量.