Bluetooth (macOS): support battery level detection

Author: CarterLi

src/detection/bluetooth/bluetooth_apple.m

@@ -2,6 +2,14 @@
 
 #import <IOBluetooth/IOBluetooth.h>
 
+@interface IOBluetoothDevice()
+    @property (nonatomic) uint8_t batteryPercentCase;
+    @property (nonatomic) uint8_t batteryPercentCombined;
+    @property (nonatomic) uint8_t batteryPercentLeft;
+    @property (nonatomic) uint8_t batteryPercentRight;
+    @property (nonatomic) uint8_t batteryPercentSingle;
+@end
+
 const char* ffDetectBluetooth(FFlist* devices /* FFBluetoothResult */)
 {
     NSArray<IOBluetoothDevice*>* ioDevices = IOBluetoothDevice.pairedDevices;
@@ -14,7 +22,14 @@
         ffStrbufInitS(&device->name, ioDevice.name.UTF8String);
         ffStrbufInitS(&device->address, ioDevice.addressString.UTF8String);
         ffStrbufInit(&device->type);
-        device->battery = 0;
+
+        if (ioDevice.batteryPercentSingle)
+            device->battery = ioDevice.batteryPercentSingle;
+        else if (ioDevice.batteryPercentCombined)
+            device->battery = ioDevice.batteryPercentCombined;
+        else if (ioDevice.batteryPercentCase)
+            device->battery = ioDevice.batteryPercentCase;
+
         device->connected = !!ioDevice.isConnected;
         if(ioDevice.serviceClassMajor & kBluetoothServiceClassMajorLimitedDiscoverableMode)
             ffStrbufAppendS(&device->type, "Limited Discoverable Mode, ");