Question

所以我有一个外设应用程序在运行，我试图在一个特征上放一个简单的字符串。外围设备看起来像这样：

- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral{
    if (peripheral.state == CBPeripheralManagerStatePoweredOn) {
        _notifyUUID = [CBUUID UUIDWithString:@"E098FDEF-B82C-43F1-8BFB-18757743BA10"];
        _notificationCharacteristic = [[CBMutableCharacteristic alloc] initWithType:_notifyUUID
                                                                         properties:CBCharacteristicPropertyNotify
                                                                              value:nil
                                                                        permissions:CBAttributePermissionsReadable];

        _shareService = [[CBMutableService alloc] initWithType:_serviceUUID primary:YES];


        [_shareService setCharacteristics:@[_notificationCharacteristic]];

        [_pMgr addService:_shareService];

        [self startAdvertising];

    }
}

-(void) peripheralManager:(CBPeripheralManager *)peripheral didReceiveReadRequest:(CBATTRequest *)request {
    request.value =
        [@"Some Data" dataUsingEncoding:NSUTF16StringEncoding];
  [_pMgr respondToRequest:request withResult:CBATTErrorSuccess];
}

然而，当我尝试查看特征上的数据并将其记录下来时，我看到的值为nil：

2015-09-24 12:57:36.875 BLEScanner[533:43084] Discovered characteristic <CBCharacteristic: 0x17546740, UUID = E098FDEF-B82C-43F1-8BFB-18757743BA10, properties = 0x10, value = (null), notifying = NO>

扫描仪来源：

-(void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error {
    NSLog( @"didDiscoverService" );

    for (CBService *service in peripheral.services) {
        NSLog(@"Discovered service %@", service);
        if( service == peripheral.services.lastObject ) {
            [peripheral discoverCharacteristics:nil forService:service];
        }
    }
}

- (void)peripheral:(CBPeripheral *)peripheral
didDiscoverCharacteristicsForService:(CBService *)service
             error:(NSError *)error {

    for (CBCharacteristic *characteristic in service.characteristics) {
        NSLog(@"Discovered characteristic %@", characteristic);
    }
}

我不知道我错过了什么，因为我已经浏览了Apple网站上使用BLE的文档（https://developer.apple.com/library/ios/documentation/NetworkingInternetWeb/Conceptual/CoreBluetooth_concepts/PerformingCommonPeripheralRoleTasks/PerformingCommonPeripheralRoleTasks.html）

iOS添加BLE特性

0 个答案: