通过蓝牙低功耗连接将腕带心率传感器的数据检索到Android应用程序

Question

I need to get all data from LogBlock charateristic of bracelet device, after a bluethooth low energy connection.

Actually I get only few byte by logblock and not all data. Does anyone know how to syncronyze and buffering all data?

Below my bluethoot service after method call connect()

    @Override
    public void onCharacteristicRead(BluetoothGatt gatt,
                                    BluetoothGattCharacteristic characteristic,int status) {
         if (status == BluetoothGatt.GATT_SUCCESS) {
            Log.i("deviceBT","onCharacteristicRead "+characteristic.toString());
            broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
        }

    }
   private void broadcastUpdate(final String action,final BluetoothGattCharacteristic characteristic) {
    final Intent intent = new Intent(action);
    if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) {
        int flag = characteristic.getProperties();
        int format = -1;
        if ((flag & 0x01) != 0) {
            format = BluetoothGattCharacteristic.FORMAT_UINT16;
            Log.d(TAG, "Heart rate format UINT16.");
        } else {
            format = BluetoothGattCharacteristic.FORMAT_UINT8;
            Log.d(TAG, "Heart rate format UINT8.");
        }
        final int heartRate = characteristic.getIntValue(format, 1);
        Log.d(TAG, String.format("Received heart rate: %d", heartRate));
        intent.putExtra(EXTRA_DATA, String.valueOf(heartRate));

    }
    else if (UUID_LOGBLOCK.equals(characteristic.getUuid())) {

         byte[] value = characteristic.getValue();
        }

Tnx in advance

UPDATE

I don't get any data from wristbend device, because I have sand init command to it by a C program.

Can any one know how to send soket of bluethoot java connection, to C program?

Answer 1

尝试获取原始字节数组（ GetValue ）而不是getIntValue

Answer 2

The problem was related to notifications ... When you read characteristics in sequence, you must be careful to set before all enables notifications and then make the first writing. If you do not respect this order will not be notified of any change even if we respect the code correctly and read times on individual characteristics.