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iOS蓝牙开发(三):App作为外设被连接的实现

2016-02-18 06:15 编辑: suiling 分类:iOS开发 来源:刘彦玮的博客

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。

CoreBluetoothFramework.jpeg

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

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

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