有時我們需要將我們的設(shè)備作為外設(shè)，來為其他中心設(shè)備提供服務(wù)。需要以下步驟：

1.創(chuàng)建一個CBPeripheralManager實例

2.基于peripheral實例，創(chuàng)建services和characteristics實例。

3.發(fā)布services和characteristics到你設(shè)備本地數(shù)據(jù)庫

4.廣播你創(chuàng)建的服務(wù)

5.對中心設(shè)備的讀寫請求做出相應(yīng)，向訂閱數(shù)據(jù)的中心設(shè)備發(fā)送數(shù)據(jù)更新通知

myPeripheralManager =[[CBPeripheralManager alloc] initWithDelegate:self queue:nil options:nil];

通過唯一的UUID來標示你創(chuàng)建的characteristics和services,UUID為128位，可以通過命令行uuidgen來產(chǎn)生多個UUID，一些通用的UUID為16位標示，但是系統(tǒng)會默認將其補充為128位。自己生成的UUID必須為128位。

CBUUID *heartRateServiceUUID = [CBUUID UUIDWithString: @"180D"];//180D為通用的心率服務(wù)IDCBUUID *myCustomServiceUUID =[CBUUID UUIDWithString:@"71DA3FD1-7E10-41C1-B16F-4430B506CDE7"];myCharacteristic =[[CBMutableCharacteristic alloc] initWithType:myCharacteristicUUIDproperties:CBCharacteristicPropertyReadvalue:myValue permissions:CBAttributePermissionsReadable];//創(chuàng)建特征myService = [[CBMutableService alloc] initWithType:myServiceUUID primary:YES];//創(chuàng)建服務(wù)myService.characteristics = @[myCharacteristic];//[myPeripheralManager addService:myService];//發(fā)布服務(wù),發(fā)布之后會加入到本地數(shù)據(jù)庫，之后就不能修改服務(wù)了// CBPeripheralManagerDelegate - (void)peripheralManager:(CBPeripheralManager *)peripheraldidAddService:(CBService *)serviceerror:(NSError *)error {if (error) {NSLog(@"Error publishing service: %@", [error localizedDescription]);}... }

發(fā)布服務(wù)到本地數(shù)據(jù)庫之后就可以廣播服務(wù)了

[myPeripheralManager startAdvertising:@{ CBAdvertisementDataServiceUUIDsKey :@[myFirstService.UUID, mySecondService.UUID] }];- (void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheralerror:(NSError *)error {if (error) {NSLog(@"Error advertising: %@", [error localizedDescription]);}... }

?對中心設(shè)備的讀寫請求相應(yīng)

- (void)peripheralManager:(CBPeripheralManager *)peripheraldidReceiveReadRequest:(CBATTRequest *)request {if ([request.characteristic.UUID isEqual:myCharacteristic.UUID]) {...if (request.offset > myCharacteristic.value.length) {[myPeripheralManager respondToRequest:requestwithResult:CBATTErrorInvalidOffset];return;}else {request.value = [myCharacteristic.valuesubdataWithRange:NSMakeRange(request.offset,myCharacteristic.value.length - request.offset)];[myPeripheralManager respondToRequest:request withResult:CBATTErrorSuccess];}} }

對于寫請求，在寫代理方法中類似實現(xiàn)方式，修改值使用

myCharacteristic.value = request.value;方法。

對于中心設(shè)備注冊監(jiān)聽的特征

- (void)peripheralManager:(CBPeripheralManager *)peripheralcentral:(CBCentral *)central didSubscribeToCharacteristic:(CBCharacteristic *)characteristic {NSLog(@"Central subscribed to characteristic %@", characteristic);... }NSData *updatedValue = // fetch the characteristic's new valueBOOL didSendValue = [myPeripheralManager updateValue:updatedValueforCharacteristic:characteristic onSubscribedCentrals:nil];//如果用于更新的隊列滿了，會返回NO，當(dāng)有隊列有空位時會調(diào)用peripheralManagerIsReadyToUpdateSubscribers: 方法，你可以在這個方法里重新發(fā)送更新數(shù)據(jù)

其他需要注意的事項：

1.限制廣播數(shù)據(jù)的大小，最大為28byte + 10byte（專用于localNameKey),在廣播的字典里，只能傳入?CBAdvertisementDataLocalNameKey?and?CBAdvertisementDataServiceUUIDsKey類型的數(shù)據(jù)。

2.在不需要時，停止廣播

[myPeripheralManager stopAdvertising];

3.對于敏感數(shù)據(jù)，進行配對驗證，對于需要訂閱的數(shù)據(jù)設(shè)置，訂閱權(quán)限。

myCharacteristic = [[CBMutableCharacteristic alloc]initWithType:myCharacteristicUUIDproperties:CBCharacteristicPropertyRead | CBCharacteristicPropertyNotifyvalue:nil permissions:CBAttributePermissionsReadable];emailCharacteristic = [[CBMutableCharacteristic alloc]initWithType:emailCharacteristicUUIDproperties:CBCharacteristicPropertyRead| CBCharacteristicPropertyNotifyEncryptionRequiredvalue:nil permissions:CBAttributePermissionsReadEncryptionRequired];

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