从 Android phone 从 nRF 51822 蓝牙温度传感器读取温度

Question

我有这个蓝牙温度传感器 https://www.aliexpress.com/item/nRF51822-Bluetooth-4-0-BLE-SOC-Temperature-Atmospheric-Pressure-Acceleration-Sensor-Module-Gyroscope-Light-Sensor-MPU6050/32859423925.html?spm=a2g0s.9042311.0.0.e3534c4dT9GRz3，我正在尝试从中读取温度。我可以连接到它，通过

获得服务

BluetoothGatt.getService(UUID.fromString("6e400001-b5a3-f393-e0a9-e50e24dcca9e")

并通过

获取特征

BluetoothGattCharacteristic mReadCharacteristic = mCustomService.getCharacteristic(UUID.fromString("6e400005-b5a3-f393-e0a9-e50e24dcca9e"));

结果：

mReadCharacteristic = {BluetoothGattCharacteristic@5322} 
 mDescriptors = {ArrayList@5326}  size = 1
 mInstance = 20
 mKeySize = 16
 mPermissions = 0
 mProperties = 16
 mService = {BluetoothGattService@5295} 
 mUuid = {UUID@5327} "6e400005-b5a3-f393-e0a9-e50e24dcca9e"
 mValue = null
 mWriteType = 2

然后我调用mBluetoothGatt.readCharacteristic(mReadCharacteristic) 并希望通过 BluetoothGattCallback 获取数据，但 readCharacteristic 总是 returns false

if ((characteristic.getProperties() & BluetoothGattCharacteristic.PROPERTY_READ) == 0) {
    return false;
}

属性 = 16 PROPERTY_READ = 5 我做错了什么？

Answer 1

Properties 是特性支持的操作的位掩码。如https://developer.android.com/reference/android/bluetooth/BluetoothGattCharacteristic.html所示，16表示notify而不是read，所以该特征是不可读的。也许您应该改为注册通知？

从 Android phone 从 nRF 51822 蓝牙温度传感器读取温度

Read temperature from nRF 51822 bluetooth temperature sensor from Android phone

android

bluetooth

bluetooth-gatt