ios蓝牙开发（三）app作为外设被连接的实现

再上一节说了app作为central连接peripheral的情况，这一节介绍如何使用app发布一个peripheral，给其他的central连接

还是这张图，central模式用的都是左边的类，而peripheral模式用的是右边的类

peripheral模式的流程

---

1. 打开peripheralManager，设置peripheralManager的委托
2. 创建characteristics，characteristics的description 创建service，把characteristics添加到service中，再把service添加到peripheralManager中
3. 开启广播advertising
4. 对central的操作进行响应
    - 4.1 读characteristics请求
    - 4.2 写characteristics请求
    - 4.4 订阅和取消订阅characteristics

准备环境

  1 xcode
  2 开发证书和手机（蓝牙程序需要使用使用真机调试，使用模拟器也可以调试，但是方法很蛋疼，我会放在最后说），如果不行可以使用osx程序调试
  3 蓝牙外设

实现步骤

1. 打开peripheralManager，设置peripheralManager的委托

设置当前ViewController实现CBPeripheralManagerDelegate委托

    @interface BePeripheralViewController : UIViewController<CBPeripheralManagerDelegate> 

初始化peripheralManager

     /*
     和CBCentralManager类似，蓝牙设备打开需要一定时间，打开成功后会进入委托方法
     - (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral;
     模拟器永远也不会得CBPeripheralManagerStatePoweredOn状态
     */
    peripheralManager = [[CBPeripheralManager alloc]initWithDelegate:self queue:nil]; 

2. 创建characteristics，characteristics的description ，创建service，把characteristics添加到service中，再把service添加到peripheralManager中

在委托方法 - (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral中，当peripheral成功打开后，才可以配置service和characteristics。 这里创建的service和chara对象是CBMutableCharacteristic和CBMutableService。他们的区别就像NSArray和NSMutableArray区别类似。 我们先创建characteristics和description，description是characteristics的描述，描述分很多种， 这里不细说了，常用的就是CBUUIDCharacteristicUserDescriptionString。

//peripheralManager状态改变
- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral{ switch (peripheral.state) { //在这里判断蓝牙设别的状态 当开启了则可调用 setUp方法(自定义) case CBPeripheralManagerStatePoweredOn: NSLog(@"powered on"); [info setText:[NSString stringWithFormat:@"设备名%@已经打开，可以使用center进行连接",LocalNameKey]]; [self setUp]; break; case CBPeripheralManagerStatePoweredOff: NSLog(@"powered off"); [info setText:@"powered off"]; break; default: break; } } 

 //配置bluetooch的
 -(void)setUp{ //characteristics字段描述 CBUUID *CBUUIDCharacteristicUserDescriptionStringUUID = [CBUUID UUIDWithString:CBUUIDCharacteristicUserDescriptionString]; /* 可以通知的Characteristic properties：CBCharacteristicPropertyNotify permissions CBAttributePermissionsReadable */ CBMutableCharacteristic *notiyCharacteristic = [[CBMutableCharacteristic alloc]initWithType:[CBUUID UUIDWithString:notiyCharacteristicUUID] properties:CBCharacteristicPropertyNotify value:nil permissions:CBAttributePermissionsReadable]; /* 可读写的characteristics properties：CBCharacteristicPropertyWrite | CBCharacteristicPropertyRead permissions CBAttributePermissionsReadable | CBAttributePermissionsWriteable */ CBMutableCharacteristic *readwriteCharacteristic = [[CBMutableCharacteristic alloc]initWithType:[CBUUID UUIDWithString:readwriteCharacteristicUUID] properties:CBCharacteristicPropertyWrite | CBCharacteristicPropertyRead value:nil permissions:CBAttributePermissionsReadable | CBAttributePermissionsWriteable]; //设置description CBMutableDescriptor *readwriteCharacteristicDescription1 = [[CBMutableDescriptor alloc]initWithType: CBUUIDCharacteristicUserDescriptionStringUUID value:@"name"]; [readwriteCharacteristic setDescriptors:@[readwriteCharacteristicDescription1]]; /* 只读的Characteristic properties：CBCharacteristicPropertyRead permissions CBAttributePermissionsReadable */ CBMutableCharacteristic *readCharacteristic = [[CBMutableCharacteristic alloc]initWithType:[CBUUID UUIDWithString:readCharacteristicUUID] properties:CBCharacteristicPropertyRead value:nil permissions:CBAttributePermissionsReadable]; //service1初始化并加入两个characteristics CBMutableService *service1 = [[CBMutableService alloc]initWithType:[CBUUID UUIDWithString:ServiceUUID1] primary:YES]; [service1 setCharacteristics:@[notiyCharacteristic,readwriteCharacteristic]]; //service2初始化并加入一个characteristics CBMutableService *service2 = [[CBMutableService alloc]initWithType:[CBUUID UUIDWithString:ServiceUUID2] primary:YES]; [service2 setCharacteristics:@[readCharacteristic]]; //添加后就会调用代理的- (void)peripheralManager:(CBPeripheralManager *)peripheral didAddService:(CBService *)service error:(NSError *)error [peripheralManager addService:service1]; [peripheralManager addService:service2]; } 

3. 开启广播advertising

//perihpheral添加了service
- (void)peripheralManager:(CBPeripheralManager *)peripheral didAddService:(CBService *)service error:(NSError *)error{ if (error == nil) { serviceNum++; } //因为我们添加了2个服务，所以想两次都添加完成后才去发送广播 if (serviceNum==2) { //添加服务后可以在此向外界发出通告 调用完这个方法后会调用代理的 //(void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheral error:(NSError *)error [peripheralManager startAdvertising:@{ CBAdvertisementDataServiceUUIDsKey : @[[CBUUID UUIDWithString:ServiceUUID1],[CBUUID UUIDWithString:ServiceUUID2]], CBAdvertisementDataLocalNameKey : LocalNameKey } ]; } } //peripheral开始发送advertising - (void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheral error:(NSError *)error{ NSLog(@"in peripheralManagerDidStartAdvertisiong"); } 

4. 对central的操作进行响应

- 4.1 读characteristics请求
- 4.2 写characteristics请求
- 4.3 订阅和取消订阅characteristics

//订阅characteristics
-(void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didSubscribeToCharacteristic:(CBCharacteristic *)characteristic{ NSLog(@"订阅了 %@的数据",characteristic.UUID); //每秒执行一次给主设备发送一个当前时间的秒数 timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(sendData:) userInfo:characteristic repeats:YES]; } //取消订阅characteristics -(void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didUnsubscribeFromCharacteristic:(CBCharacteristic *)characteristic{ NSLog(@"取消订阅 %@的数据",characteristic.UUID); //取消回应 [timer invalidate]; } //发送数据，发送当前时间的秒数 -(BOOL)sendData:(NSTimer *)t { CBMutableCharacteristic *characteristic = t.userInfo; NSDateFormatter *dft = [[NSDateFormatter alloc]init]; [dft setDateFormat:@"ss"]; NSLog(@"%@",[dft stringFromDate:[NSDate date]]); //执行回应Central通知数据 return [peripheralManager updateValue:[[dft stringFromDate:[NSDate date]] dataUsingEncoding:NSUTF8StringEncoding] forCharacteristic:(CBMutableCharacteristic *)characteristic onSubscribedCentrals:nil]; } //读characteristics请求 - (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveReadRequest:(CBATTRequest *)request{ NSLog(@"didReceiveReadRequest"); //判断是否有读数据的权限 if (request.characteristic.properties & CBCharacteristicPropertyRead) { NSData *data = request.characteristic.value; [request setValue:data]; //对请求作出成功响应 [peripheralManager respondToRequest:request withResult:CBATTErrorSuccess]; }else{ [peripheralManager respondToRequest:request withResult:CBATTErrorWriteNotPermitted]; } } //写characteristics请求 - (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveWriteRequests:(NSArray *)requests{ NSLog(@"didReceiveWriteRequests"); CBATTRequest *request = requests[0]; //判断是否有写数据的权限 if (request.characteristic.properties & CBCharacteristicPropertyWrite) { //需要转换成CBMutableCharacteristic对象才能进行写值 CBMutableCharacteristic *c =(CBMutableCharacteristic *)request.characteristic; c.value = request.value; [peripheralManager respondToRequest:request withResult:CBATTErrorSuccess]; }else{ [peripheralManager respondToRequest:request withResult:CBATTErrorWriteNotPermitted]; } } 

代码下载:

我博客中大部分示例代码都上传到了github，地址是：https://github.com/coolnameismy/demo，点击跳转代码下载地址

本文代码存放目录是BleDemo