电池电量状态 (0x2A1B)未在蓝牙文档的电池服务规范下列出,只有电池电量 (0x2A19) 列出。但是,在 Battery Service 下读取特征Battery Level State (0x2A1B)时,会找到并false
返回 0x2A1B 特征,而不是错误或null
.
找到这个例子,true
读取电池电量(0x2A19,org.bluetooth.characteristic.battery_level)时返回where,它被列为电池电量状态(0x2A1B)描述中的值字段之一。
根据规格,电池电量状态“包括”电池电量:
编辑:使用 Nordic Connect Android 应用程序读取电池电量状态 (0x2A1B)时,这是值:Invalid data syntax: (0x) 64, "d"
。
问题:
- 电池电量状态 (0x2A1B)属于什么蓝牙服务?是成功返回的Battery Service吗?
false
其他StackOverflow 问题询问Battery Power State (0x2A1A),它也列在Battery Level State下。这是如何运作的? - 从读取特征返回的
false
and表示什么?true
-
背景: 我正在尝试通过 Android 应用程序从 nRF51822 模块(基于Adafruit Bluefruit 32u4 LE)读取电池电量。
发现的服务和特性包括电池服务 (0x180F)和电池电量状态特性 (0x2A1B)。还尝试根据Adafruit 教程添加自定义特征以读取电池电量,但 Android 应用找不到新添加的特征。但是,使用 AT 命令读取特征是有效的 - 模块返回一个int
.
我正在读取0x2A1B内的特性onServicesDiscovered
。我可以成功阅读的其他特征。这是基于此线程的 Android 应用程序中的代码:
static String BATTERY_SERVICE_UUID = "0000180f-0000-1000-8000-00805f9b34fb";
static String BATTERY_LEVEL_UUID = "00002a1b-0000-1000-8000-00805f9b34fb";
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
//Read the battery level
getbattery(gatt);
}
}
void getbattery(BluetoothGatt mGatt) {
BluetoothGattService batteryService = mGatt.getService(BATTERY_SERVICE_UUID);
if(batteryService == null) {
Log.i("BATTERYX", "Battery service not found!");
return;
}
Log.i("BATTERYX", "Battery service found!");
BluetoothGattCharacteristic batteryLevel = batteryService.getCharacteristic(BATTERY_LEVEL_UUID);
if(batteryLevel == null) {
Log.i("BATTERY", "Battery characteristic not found!");
return;
} Log.i("BATTERYX", "Battery characteristic found!");
Log.i("BATTERYX", String.valueOf(mGatt.readCharacteristic(batteryLevel)));
}
这是已发现服务和特征的完整列表。
## SERVICES
[{UUID=00001800-0000-1000-8000-00805f9b34fb, NAME=Service Unknown},
{UUID=00001801-0000-1000-8000-00805f9b34fb, NAME=Service Unknown},
{UUID=00001530-1212-efde-1523-785feabcd123, NAME=Service Unknown},
{UUID=0000180a-0000-1000-8000-00805f9b34fb, NAME=Service Unknown},
{UUID=6e400001-b5a3-f393-e0a9-e50e24dcca9e, NAME=SERIAL_TRANSFER_SERVICE_UUID},
{UUID=0000180f-0000-1000-8000-00805f9b34fb, NAME=BATTERY_SERVICE_UUID}]
## CHARACTERISTICS
[[{UUID=00002a00-0000-1000-8000-00805f9b34fb, NAME=Characteristic Unknown}, //Device
{UUID=00002a01-0000-1000-8000-00805f9b34fb, NAME=Characteristic Unknown}, //Appearance
{UUID=00002a04-0000-1000-8000-00805f9b34fb, NAME=Characteristic Unknown}], //Peripheral Preferred Connection Parameters
[{UUID=00002a05-0000-1000-8000-00805f9b34fb, NAME=Characteristic Unknown}], //Service Changed
[{UUID=00001532-1212-efde-1523-785feabcd123, NAME=Characteristic Unknown},
{UUID=00001531-1212-efde-1523-785feabcd123, NAME=Characteristic Unknown},
{UUID=00001534-1212-efde-1523-785feabcd123, NAME=Characteristic Unknown}],
[{UUID=00002a29-0000-1000-8000-00805f9b34fb, NAME=Characteristic Unknown}, //Manufacturer Name String
{UUID=00002a24-0000-1000-8000-00805f9b34fb, NAME=Characteristic Unknown}, //Model Number String
{UUID=00002a28-0000-1000-8000-00805f9b34fb, NAME=Characteristic Unknown}, //Software Revision String
{UUID=00002a26-0000-1000-8000-00805f9b34fb, NAME=Characteristic Unknown}, //Firmware Revision String
{UUID=00002a27-0000-1000-8000-00805f9b34fb, NAME=Characteristic Unknown}], //Hardware Revision String
[{UUID=6e400003-b5a3-f393-e0a9-e50e24dcca9e, NAME=SERIAL_TRANSFER_CHARACTERISTIC},
{UUID=6e400002-b5a3-f393-e0a9-e50e24dcca9e, NAME=Characteristic Unknown}],
[{UUID=00002a1b-0000-1000-8000-00805f9b34fb, NAME=Characteristic Unknown}]] //Battery level state