Ios 蓝牙LE can'；t将数据从中央发送到外围设备

我正在处理蓝牙低能量的问题。我用iPhone找到了我的外围设备，连接到它，还找到了服务和处于写入模式的特性。但当我尝试发送一些数据时，什么也没有发生-设备没有接收任何东西，并且也没有调用

-（void）peripheral:（CBPeripheral*）peripheral didUpdateValueForCharacteristic:（CBCharacteristic*）characteristic error:（NSError*）error

我的writeValue方法如下：

-(void) writeValue:(int)serviceUUID characteristicUUID:(int)characteristicUUID p:(CBPeripheral *)p data:(NSData *)data {

    CBUUID *UUIDService = [CBUUID UUIDWithString:[NSString stringWithFormat:@"%@",TRANSFER_SERVICE_UUID]];
    CBUUID *UUIDCharacteristic = [CBUUID UUIDWithString:[NSString stringWithFormat:@"%@",TRANSFER_CHARACTERISTIC_UUID]];

    NSLog(@"ALERT");
    CBService *service = [self findServiceFromUUID:UUIDService p:p];
    if (!service)
        {
            NSLog(@"Could not find service with UUID %@ on peripheral with UUID %@",
                  [self CBUUIDToString:UUIDService],
                  p.identifier.UUIDString);

            return;
        }

    CBCharacteristic *characteristic = [self findCharacteristicFromUUID:UUIDCharacteristic service:service];
    if (!characteristic)
    {
        NSLog(@"Could not find characteristic with UUID %@ on service with UUID %@ on peripheral with UUID %@",
              [self CBUUIDToString: UUIDCharacteristic],
              [self CBUUIDToString:UUIDService],
              p.identifier.UUIDString);

        return;
    }

    NSString *message = @"AB";
    NSData *dataMsg= [message dataUsingEncoding:NSUTF8StringEncoding];

    [p writeValue:dataMsg forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];

}

有什么问题吗？

试试这个。斯威夫特3 此代码用于启用CBCharacteristic的notify（0x12用于notify属性）

试试这个。斯威夫特3 此代码用于启用CBCharacteristic的notify（0x12用于notify属性）

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是否调用了

外围设备：didWriteValueForCharacteristic:错误：

？

findCharacteristicFromUUID:

？不，

外围设备：didWriteValueForCharacteristic:error:

也不被调用

findCharacteristicFromUUID:

只需检查我编写的UUID是否与服务的特征之一相同：`-（CBCharacteristicFromUUID:（CBUUID*）UUID服务：（CBService）服务{for（int I=0；I外围设备：didWriteValueForCharacteristic:error:？从UUID:中查找到什么特征？

外围设备：didWriteValueForCharacteristic:error:

也不被调用。

findCharacteristicFromUUID:

只是检查我编写的UUID是否与服务的特征之一相同：`-（CBCharacteristic）findCharacteristicFromUUID:（CBUUID*）UUID服务：（CBService）服务{for（int I=0；Ifunc peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) { for newChar: CBCharacteristic in service.characteristics!{ peripheral.readValue(for: newChar) if newChar.properties.rawValue == 0x12{ peripheral.setNotifyValue(true, for: newChar) } } }