使用Core蓝牙，我想把数据从iPhone发送到Mac。为此，我编写了类似iphone的“外围设备”和mac的“中心”代码。
它工作得很好，但有时它直接断开，然后连续地连接和断开。
有时，当它试图重新连接时，在中心直接调用“didDisconnectPeripheral”委托方法。但有时在“didUpdateMotificationStateForCharacteristic”中出现错误“句柄无效”。
我提到了网上所有的链接。但我不能解决这个问题。我以为在iPhone里它是在存储蓝牙缓存。
请提出解决方案如何解决“句柄无效”错误？
下面是一些重要的方法。
对于外围设备，我写了如下代码。
在AppDelegate中：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.peripheral = [[PeripheralServerObject alloc] init];
self.peripheral.serviceUUID = [CBUUID UUIDWithString:@"4w24"];
return YES;
}
在外围对象文件中：
//To Check Bluetooth State
- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral {
switch (peripheral.state) {
case CBPeripheralManagerStatePoweredOn:
[self enableService];
break;
case CBPeripheralManagerStatePoweredOff: {
[self disableService];
break;
}
}
// To Add characteristics to Service
- (void)enableService
{
[self.peripheral removeAllServices];
self.service = [[CBMutableService alloc]
initWithType:self.serviceUUID primary:YES];
self.authChar =
[[CBMutableCharacteristic alloc] initWithType:[CBUUID UUIDWithString:@"a86e"]
properties:CBCharacteristicPropertyNotify
value:nil
permissions:CBAttributePermissionsReadable];
self.respChar =
[[CBMutableCharacteristic alloc] initWithType:[CBUUID UUIDWithString:@"a86f"]
properties:CBCharacteristicPropertyWriteWithoutResponse
value:nil
permissions:CBAttributePermissionsWriteable];
self.service.characteristics = @[ self.authChar, self.respChar ];
// Add the service to the peripheral manager.
[self.peripheral addService:self.service];
}
//Peripheral Manager delegate method will be called after adding service.
- (void)peripheralManager:(CBPeripheralManager *)peripheral
didAddService:(CBService *)service
error:(NSError *)error {
[self startAdvertising];
}
//To disable service
- (void)disableService
{
[self.peripheral stopAdvertising];
[self.peripheral removeAllServices];
}
//To enable a service again.
-(void)refreshService {
[self disableService];
[self enableService];
}
If central subscribes the characteristic, then the below peripheral delegate method will be called. In this I implemented code to send data
- (void)peripheralManager:(CBPeripheralManager *)peripheral
central:(CBCentral *)central
didSubscribeToCharacteristic:(CBCharacteristic *)characteristic {
self.dataTimer = [NSTimer scheduledTimerWithTimeInterval:10.0
target:self
selector:@selector(sendData)
userInfo:nil
repeats:YES];
}
- (void)sendData
{
Here I am sending data like [Apple's BTLE Example Code][1]
}
//If unsubscribed then I am invalidating timer and refreshing service
- (void)peripheralManager:(CBPeripheralManager *)peripheral
central:(CBCentral *)central
didUnsubscribeFromCharacteristic:(CBCharacteristic *)characteristic {
if (self.dataTimer)
[self.dataTimer invalidate];
[self refreshService];
}
对于Mac，我编写了一个外围委托方法。
//I enables the notification for "a860" Characteristic.
- (void)peripheral:(CBPeripheral *)peripheral
didDiscoverCharacteristicsForService:(CBService *)service
error:(NSError *)error {
CBUUID * authUUID = [CBUUID UUIDWithString:@"a86e"];
for (CBCharacteristic *characteristic in service.characteristics) {
if ([characteristic.UUID isEqual:authUUID]) {
}
[self.connectedPeripheral setNotifyValue:YES
forCharacteristic:characteristic];
}
}
-(void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error {
if (error) {
Here I am getting error sometimes "The handle is invalid".
}
}
最佳答案：
我最近遇到了同样的问题。
我找到的唯一解决方案是重新启动蓝牙（关闭蓝牙并重新打开）。
在我的例子中，是蓝牙设备（在DFU模式下重新启动）中的更改导致了这个问题，所以我最终向用户显示了重新启动蓝牙的警报。监听centralManagerDidUpdateState:的powered off和than powered back on state事件以确定重启是否完成。
