Question

我试图使用CoreBluetooth和GATT从蓝牙设备读取电池电量。我成功连接到设备，我也得到了正确的服务列表，如下面的调试所示：

didDiscoverServices:(
"<CBService: 0x170273440, isPrimary = YES, UUID = Device Information>",
"<CBService: 0x170273700, isPrimary = YES, UUID = 1803>",
"<CBService: 0x170273740, isPrimary = YES, UUID = 1802>",
"<CBService: 0x170273780, isPrimary = YES, UUID = 1804>",
"<CBService: 0x1702737c0, isPrimary = YES, UUID = Battery>",
"<CBService: 0x170273800, isPrimary = YES, UUID = Heart Rate>",
"<CBService: 0x170273840, isPrimary = YES, UUID = FFF0>",
"<CBService: 0x170273880, isPrimary = YES, UUID = FFF3>")

显然我们在这里想要的是电池＆＃34;电池＆＃34; UUID。它只有一项服务：

<CBCharacteristic: 0x1700bf500, UUID = Battery Level, properties = 0x12, value = <64>, notifying = NO>

所以我将这个特征保存到变量中以便稍后阅读。然后我打电话给＃34; readValueForCharacteristic＆＃34;并等待＆＃34; didUpdateValueForCharacteristic＆＃34;给我带来更新。一切正常，直到那一点。价值似乎是错误的。它只是1位，等于＆lt; 64＆gt;无论我做什么，它永远不会改变。在做的时候我总是得到100％：

Byte *rsp = (Byte*)[value bytes];
NSString percent = [NSString stringWithFormat:@"%hhu",rsp[0]];

我错过了什么吗？

读取Ble设备电池值

0 个答案: