ios蓝牙开发（四）app作为外设被连接的实现－转发

代码下载:

原博客中大部分示例代码都上传到了github，地址是：https://github.com/coolnameismy/demo。

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

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];

}

}