iOS CoreBluetooth：startAdvertising() 广播静态数据时出错

Question

我想宣传静态数据。我在 iOS 上使用 Swift 2.2.1 和 CoreBluetooth。我的应用构建蓝牙 Services 及其相应的 Characteristics，然后调用 startAdvertising()，然后 peripheralManagerDidStartAdvertising90回调returns这个错误：

peripheralManagerDidStartAdvertising encountered an error. // Mine
One or more parameters were invalid. // ...from Apple CoreBluetooth
nil  // ... return value from Apple CoreBluetooth callback

我对 Swift 和 iOS 开发比较陌生，所以我猜我在做一些愚蠢的事情，但到目前为止我还不知道是什么。

我会尝试将事情提炼出来以供更有经验的人使用。

- - - - - - pointutility.swift - - - - - - -
// This is a code excerpt and probably won't compile.

// UUID for the one peripheral service, declared outside the class:
var peripheralServiceUUID = CBUUID(string: "9BC1F0DC-F4CB-4159-BD38-7375CD0DD545")

// UUID for one characteristic of the service above, declared outside the class:
var nameCharacteristicUUID = CBUUID(string: "9BC1F0DC-F4CB-4159-BD38-7B74CD0CD546")

class PointUtility: NSObject, CBPeripheralManagerDelegate {

var peripheralManager:CBPeripheralManager?
var bluetoothServices:CBMutableService?
var nameCharacteristic:CBMutableCharacteristic?

override init() {
    super.init()
    peripheralManager = CBPeripheralManager(delegate:self, queue:nil)
    bluetoothServices = CBMutableService(type: peripheralServiceUUID, primary: true)
}

func configureUtilityForIdentity(identity:Point!) {
    var characteristicsArray:[CBCharacteristic] = []
    myIdentity = identity

      if (identity.name != nil) {
        nameCharacteristic =
            CBMutableCharacteristic(type: nameCharacteristicUUID,
                properties: (CBCharacteristicProperties.Read),
                value: myIdentity?.name?.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false),
                permissions: CBAttributePermissions.Readable)

        characteristicsArray.append(nameCharacteristic!)
      }

    // more characteristics built here and added to the characteristicsArray[]...
    // ... then all are added to the CBMutableService at the bottom...
    bluetoothServices?.characteristics = characteristicsArray as [CBCharacteristic]
}


func peripheralManagerDidUpdateState(peripheral: CBPeripheralManager) {
    switch (peripheral.state) {
    case .PoweredOn:
        print("Current Bluetooth State:  PoweredOn")
        publishServices(bluetoothServices)
        break;
    case .PoweredOff:
        print("Current Bluetooth State:  PoweredOff")
        break;
    case .Resetting:
        print("Current Bluetooth State:  Resetting")
        break;
    case .Unauthorized:
        print("Current Bluetooth State:  Unauthorized")
    case .Unknown:
        print("Current Bluetooth State:  Unknown")
        break;
    case .Unsupported:
        /
        print("Current Bluetooth State:  Unsupported")
        break;
    }
}

func publishServices(newService:CBMutableService!) {
    peripheralManager?.addService(newService)
}

func peripheralManager(peripheral: CBPeripheralManager, didAddService service: CBService, error: NSError?) {

    if (error != nil) {
        print("PerformerUtility.publishServices() returned error: \(error!.localizedDescription)")
        print("Providing the reason for failure: \(error!.localizedFailureReason)")
    }
    else {
        peripheralManager?.startAdvertising([CBAdvertisementDataServiceUUIDsKey : service.UUID])
    }
}

func peripheralManagerDidStartAdvertising(peripheral: CBPeripheralManager,
    error: NSError?) {
        if (error != nil) {
            print("peripheralManagerDidStartAdvertising encountered an error.")
            print(error!.localizedDescription)  // Error: One or more parameters were invalid
            print(error!.localizedFailureReason)  // Error: nil
        }
        print ("Debug: peripheralManagerDidStartAdvertising()")
}
}
- - - - - - pointutility.swift - - - - - - -

非常感谢提供的任何帮助。

此致，

迈克尔

Answer 1

传递给 startAdvertising 的字典中 CBAdvertisementDataServiceUUIDsKey 的值是一个 CBUUID 对象数组，但您只传递了一个 CBUUID。一旦我将它更改为数组，您的代码就可以工作了。

func peripheralManager(peripheral: CBPeripheralManager, didAddService service: CBService, error: NSError?) {

    if (error != nil) {
        print("PerformerUtility.publishServices() returned error: \(error!.localizedDescription)")
        print("Providing the reason for failure: \(error!.localizedFailureReason)")
    }
    else {
        peripheralManager?.startAdvertising([CBAdvertisementDataServiceUUIDsKey : [service.UUID]])
    }
}

Answer 2

一些小问题；我有一个额外的参数。

peripheralManager = CBPeripheralManager(delegate: self, queue: nil, options: nil)

我在 peripheralManagerDidUpdateState 中有这段代码，就在最上面。

if (peripheral.state != .PoweredOn) {
    return;
}

我在同一个方法中调用它，当然假设它是打开的。

transferCharacteristic = CBMutableCharacteristic(type: cbtransfer, properties: .Notify, value: nil, permissions: .Readable)
transferService = CBMutableService(type: cbservice, primary: true)
transferService.characteristics = [transferCharacteristic]

最后我这样做了：

peripheralManager!.addService(transferService)                    
peripheralManager!.startAdvertising([CBAdvertisementDataServiceUUIDsKey :[cbservice]])

但是请注意；我没有附加特征；我使用您在此处看到的语法，附加不起作用。由于我不清楚的原因 Swift 说它没问题，但它在语法上很好，但 BLE 不喜欢它。

func publishServices(newService:CBMutableService!) {
    peripheralManager?.addService(newService)
}

检查您的代码并进行更改；它应该工作。

Answer 3

方法中的错误参数：

func peripheralManagerDidStartAdvertising(_ peripheral: CBPeripheralManager, error: Error?)

报错：

Error Domain=CBErrorDomain Code=1 "One or more parameters were invalid." UserInfo={NSLocalizedDescription=One or more parameters were invalid.}

问题是需要传递 UUID 的数组并且还使用 CBUUID(string:) 类型而不是 UUID(uuidString:)。每个问题都会独立重现错误。

struct BluetoothPeripheral {
    let localName: String
    let uuid: String

    func peripheralData() -> [String : Any] {
        return [
            CBAdvertisementDataLocalNameKey    : localName,
            CBAdvertisementDataServiceUUIDsKey : [CBUUID(string: uuid)],
        ]
    }
}

iOS CoreBluetooth：startAdvertising() 广播静态数据时出错

iOS CoreBluetooth: startAdvertising() Error advertising static data

core-bluetooth

swift