无法写入或读取CBPeripheral | CBMutableCharacteristic

Question

我正在连接一个蓝牙硬件，但是我得不到通知，当一个值被更新时，我的代码如下：

func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError?) {

    guard peripheral == self.peripheral && error == nil else {
        return
    }

    if let characteristics = service.characteristics {
        for characteristic in characteristics {
            if characteristic.UUID == QuadrarCharacteristicUUID {
                if let peripheral = self.peripheral {
                    self.quadrarCharacteristic = CBMutableCharacteristic(type: QuadrarCharacteristicUUID,
                        properties: [.Read, .Write, .Notify],
                        value: nil,
                        permissions: [.Readable, .Writeable])
                    self.quadrarCharacteristic?.descriptors = characteristic.descriptors
                    peripheral.setNotifyValue(true, forCharacteristic: self.quadrarCharacteristic!)
                }
            }
        }
    }
}

当我写的时候：

 func writeBytes() {
           self.quadrarCharacteristic!.service.peripheral.writeValue(self.bytesToWriteArray[self.senderCounter], 
            forCharacteristic: self.quadrarCharacteristic!, type: CBCharacteristicWriteType.WithResponse)
    }

我知道，即使是写作也行不通因为

 func peripheral(peripheral: CBPeripheral, didWriteValueForCharacteristic characteristic: CBCharacteristic, error: NSError?)

没有被称为..。但是如果我只使用

var quadrarCharacteristic: CBCharacteristic?

试着写它，作为一个非CBMutableCharacteristic，它可以工作，但我不能让通知工作…

Answer 1

当您充当中心时，您不需要创建新的CBMutableCharacteristic，只需使用didDiscoverCharacteristicsForService中提供给您的CBCharacteristic对象-

func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError?) {

    guard peripheral == self.peripheral && error == nil else {
        return
    }

    if let characteristics = service.characteristics {
        for characteristic in characteristics {
            if characteristic.UUID == QuadrarCharacteristicUUID {
                self.quadrarCharacteristic=charateristic
                peripheral.setNotifyValue(true, forCharacteristic: self.quadrarCharacteristic!)
                }
            }
        }
    }
}

此外，您还需要确认您的特征是否支持通知。