之前在基础知识介绍过BLE应用的两种流程,如图:
- 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.引入CoreBluetooth框架,初始化peripheralManager
- 2.设置peripheralManager中的内容
- 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
具体操作步骤
1.引入CoreBluetooth框架,初始化peripheralManager
#import
@interface XMGBLEPeripheralViewController ()
@property (nonatomic, strong) CBPeripheralManager *pMgr; /**< 外设管理者 */
@end
@implementation XMGBLEPeripheralViewController
// 懒加载
- (CBPeripheralManager *)pMgr
{
if (!_pMgr) {
_pMgr = [[CBPeripheralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()];
}
return _pMgr;
}
- (void)viewDidLoad {
[super viewDidLoad];
// 调用get方法初始化,初始化后CBPeripheralManager状态改变会调用代理方法peripheralManagerDidUpdateState:
// 模拟器永远也不会是CBPeripheralManagerStatePoweredOn状态
[self pMgr];
}
2.设置peripheralManager中的内容
- 创建characteristics及其description,
- 创建service,把characteristics添加到service中,
- 再把service添加到peripheralManager中
#pragma mark - CBPeripheralManagerDelegate
// CBPeripheralManager初始化后会触发的方法
- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral
{
if (peripheral.state == CBPeripheralManagerStatePoweredOn) {
// 提示设备成功打开
[SVProgressHUD showSuccessWithStatus:@"xmg设备打开成功~"];
// 配置各种服务入CBPeripheralManager
[self yf_setupPMgr];
}else
{
// 提示设备打开失败
[SVProgressHUD showErrorWithStatus:@"失败!"];
}
}
#pragma mark - 私有方法
- (void)yf_setupPMgr
{
// 特征描述的UUID
CBUUID *characteristicUserDescriptionUUID = [CBUUID UUIDWithString:CBUUIDCharacteristicUserDescriptionString];
// 特征的通知UUID
CBUUID *notifyCharacteristicUUID = [CBUUID UUIDWithString:notiyCharacteristicStrUUID];
// 特征的读写UUID
CBUUID *readwriteCharacteristicUUID = [CBUUID UUIDWithString:readwriteCharacteristicStrUUID];
// 特征的只读UUID
CBUUID *readCharacteristicUUID = [CBUUID UUIDWithString:readwriteCharacteristicStrUUID];
CBUUID *ser1UUID = [CBUUID UUIDWithString:Service1StrUUID];
CBUUID *ser2UUID = [CBUUID UUIDWithString:Service2StrUUID];
// 初始化一个特征的描述
CBMutableDescriptor *des1 = [[CBMutableDescriptor alloc] initWithType:characteristicUserDescriptionUUID value:@"xmgDes1"];
// 可通知的特征
CBMutableCharacteristic *notifyCharacteristic = [[CBMutableCharacteristic alloc] initWithType:notifyCharacteristicUUID // UUID
properties:CBCharacteristicPropertyNotify // 枚举:通知
value:nil // 数据先不传
permissions:CBAttributePermissionsReadable]; // 枚举:可读
// 可读写的特征
CBMutableCharacteristic *readwriteChar = [[CBMutableCharacteristic alloc] initWithType:readwriteCharacteristicUUID
properties:CBCharacteristicPropertyRead | CBCharacteristicPropertyWrite
value:nil
permissions:CBAttributePermissionsReadable | CBAttributePermissionsWriteable];
[readwriteChar setDescriptors:@[des1]]; // 设置特征的描述
// 只读特征
CBMutableCharacteristic *readChar = [[CBMutableCharacteristic alloc] initWithType:readCharacteristicUUID
properties:CBCharacteristicPropertyRead
value:nil
permissions:CBAttributePermissionsReadable];
// 初始化服务1
CBMutableService *ser1 = [[CBMutableService alloc] initWithType:ser1UUID primary:YES];
// 为服务设置俩特征(通知, 带描述的读写)
[ser1 setCharacteristics:@[notifyCharacteristic, readwriteChar]];
// 初始化服务2,并且添加一个只读特征
CBMutableService *ser2 = [[CBMutableService alloc] initWithType:ser2UUID primary:YES];
ser2.characteristics = @[readChar];
// 添加服务进外设管理者
// 添加操作会触发代理方法peripheralManager:didAddService:error:
[self.pMgr addService:ser1];
[self.pMgr addService:ser2];
}
3.开启广播
// 添加服务进CBPeripheralManager时会触发的方法
- (void)peripheralManager:(CBPeripheralManager *)peripheral didAddService:(CBService *)service error:(NSError *)error
{
// 由于添加了两次ser,所以方法会调用两次
static int i = 0;
if (!error) {
i++;
}
// 当第二次进入方法时候,代表两个服务添加完毕,此时要用到2,由于没有扩展性,所以新增了可变数组,记录添加的服务数量
if (i == self.servieces.count) {
// 广播内容
NSDictionary *advertDict = @{CBAdvertisementDataServiceUUIDsKey: [self.servieces valueForKeyPath:@"UUID"],
CBAdvertisementDataLocalNameKey:LocalNameKey};
// 发出广播,会触发peripheralManagerDidStartAdvertising:error:
[peripheral startAdvertising:advertDict];
}
}
// 开始广播触发的代理
- (void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheral error:(NSError *)error
{
}
>>>>>>>>分割线>>>>下面是修改的地方
@property (nonatomic, strong) NSMutableArray *servieces; /**< 服务可变数组 */
// 自定义服务
- (NSMutableArray *)servieces
{
if (!_servieces) {
_servieces = [NSMutableArray array];
}
return _servieces;
}
#pragma mark - 私有方法
- (void)yf_setupPMgr
{
...
// 初始化服务1
CBMutableService *ser1 = [[CBMutableService alloc] initWithType:ser1UUID primary:YES];
// 为服务设置俩特征(通知, 带描述的读写)
[ser1 setCharacteristics:@[notifyCharacteristic, readwriteChar]];
[self.servieces addObject:ser1];
// 初始化服务2,并且添加一个只读特征
CBMutableService *ser2 = [[CBMutableService alloc] initWithType:ser2UUID primary:YES];
ser2.characteristics = @[readChar];
[self.servieces addObject:ser2];
// 添加服务进外设管理者
// 添加操作会触发代理方法peripheralManager:didAddService:error:
if (self.servieces.count) {
for (CBMutableService *ser in self.servieces) {
[self.pMgr addService:ser];
}
}
}
4.对central的操作做出响应
- 4.1 读characteristics请求
- 4.2 写characteristics请求
- 4.3 订阅和取消订阅characteristics
// 外设收到读的请求,然后读特征的值赋值给request
- (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveReadRequest:(CBATTRequest *)request
{
NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
// 判断是否可读
if (request.characteristic.properties & CBCharacteristicPropertyRead) {
NSData *data = request.characteristic.value;
request.value = data;
// 对请求成功做出响应
[self.pMgr respondToRequest:request withResult:CBATTErrorSuccess];
}else
{
[self.pMgr respondToRequest:request withResult:CBATTErrorWriteNotPermitted];
}
}
// 外设收到写的请求,然后读request的值,写给特征
- (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveWriteRequests:(NSArray *)requests
{
NSLog(@"%s, line = %d, requests = %@", __FUNCTION__, __LINE__, requests);
CBATTRequest *request = requests.firstObject;
if (request.characteristic.properties & CBCharacteristicPropertyWrite) {
NSData *data = request.value;
// 此处赋值要转类型,否则报错
CBMutableCharacteristic *mChar = (CBMutableCharacteristic *)request.characteristic;
mChar.value = data;
// 对请求成功做出响应
[self.pMgr respondToRequest:request withResult:CBATTErrorSuccess];
}else
{
[self.pMgr respondToRequest:request withResult:CBATTErrorWriteNotPermitted];
}
}
// 与CBCentral的交互
// 订阅特征
- (void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didSubscribeToCharacteristic:(CBCharacteristic *)characteristic
{
NSLog(@"%s, line = %d, 订阅了%@的数据", __FUNCTION__, __LINE__, characteristic.UUID);
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:2.0
target:self
selector:@selector(yf_sendData:)
userInfo:characteristic
repeats:YES];
self.timer = timer;
/* 另一种方法 */
// NSTimer *testTimer = [NSTimer timerWithTimeInterval:2.0
// target:self
// selector:@selector(yf_sendData:)
// userInfo:characteristic
// repeats:YES];
// [[NSRunLoop currentRunLoop] addTimer:testTimer forMode:NSDefaultRunLoopMode];
}
// 取消订阅特征
- (void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didUnsubscribeFromCharacteristic:(CBCharacteristic *)characteristic
{
NSLog(@"%s, line = %d, 取消订阅了%@的数据", __FUNCTION__, __LINE__, characteristic.UUID);
[self.timer invalidate];
self.timer = nil;
}
- (void)peripheralManagerIsReadyToUpdateSubscribers:(CBPeripheralManager *)peripheral
{
NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}
// 计时器每隔两秒调用的方法
- (BOOL)yf_sendData:(NSTimer *)timer
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"yy:MM:dd:HH:mm:ss";
NSString *now = [dateFormatter stringFromDate:[NSDate date]];
NSLog(@"now = %@", now);
// 执行回应central通知数据
return [self.pMgr updateValue:[now dataUsingEncoding:NSUTF8StringEncoding]
forCharacteristic:timer.userInfo
onSubscribedCentrals:nil];
}
