电池电量状态(0x2A1B)未在蓝牙文档的Battery Service规范中列出,只有电池电量(0x2A19)列出。但是,在读取电池服务下的特征电池电量状态(0x2A1B)时,将找到0x2A1B特征并返回false
,而不是错误或null
。
找到了这个example,在读取电池电量(0x2A19 ,org.bluetooth.characteristic.battery_level)时返回了true
,该电池电量被列为电池电量状态(0x2A1B)的说明中的“值”字段。
根据specs,电池电量状态“包括”电池电量:
编辑:使用Nordic Connect Android应用读取电池电量状态(0x2A1B)时,其值为:Invalid data syntax: (0x) 64, "d"
。
问题:
false
的电池服务吗?其他StackOverflow question询问电池电源状态(0x2A1A),该状态也列在电池电量状态下。如何运作?false
和true
从读取特征返回时指示什么?-
背景: 我正在尝试通过nRF51822模块(基于Adafruit Bluefruit 32u4 LE)通过Android应用读取电池电量。
发现的服务和特征包括电池服务(0x180F)和电池电量状态特征(0x2A1B)。还尝试根据Adafruit tutorial添加自定义特征以读取电池电量,但Android应用未找到新添加的特征。但是,使用AT命令读取特征是可行的-模块返回int
。
我正在读取onServicesDiscovered
中的 0x2A1B 特性。我可以成功阅读其他特征。这是基于this thread的Android应用中的代码:
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
答案 0 :(得分:2)
电池电量状态应为您提供0到64(100)百分比的电池电量