本文默认读者对蓝牙开发有基础的了解, 与外设的交互使用 BabyBluetooth.

      一. 总结的要点如下:

1. iOS 蓝牙与外设连接的步骤.

2. 外设过滤, 服务, 特性.

3. 单模,双模蓝牙.

4. 外设的 UUID.

二. 实际应用场景:

通过 APP 控制荣泰按摩椅, 方便用户切换按摩模式.

三. 第一点对应 OC 代码

1. 在 BabyBluetooth 库中, BabyBluetooth Class 封装了与蓝牙外设交互的所有方法,通过舒适化 BabyBluetooth ,实现代理方法,就可以与外设进行通信.

    //1 初始化
    //2 扫描设备
    //3 连接外设
    //3.1 查找服务
    //3.2 查找到Characteristics并筛选
    //4 写入数据
    //5 读取转换数据

2. 在搜索到蓝牙设备后,要知道每个蓝牙设备都会不少于一个的服务,每个服务都会有不少于一个的特性,我们与外设进行通信,是要约定好这个唯一的特性后,才可正确得进行串口通信.其中特性的属性有读,写两种,我们根据硬件工程师提供给我们的标识,可以获取到这两个需要的特性.

//连接Peripherals成功的委托
    [weakSelf.baby setBlockOnConnected:^(CBCentralManager *central, CBPeripheral *peripheral) {
        NSLog(@"已连接的设备:____%@", peripheral);
        //搜索指定服务
        [peripheral discoverServices: @[[CBUUID UUIDWithString:SERVICE_UUID]]];
        self.isConnected = YES;
        
    }];

//查找服务
    [weakSelf.baby setBlockOnDiscoverServices:^(CBPeripheral *peripheral, NSError *error) {
        
        for (CBService *service in peripheral.services) {
            if([service.UUID isEqual:[CBUUID UUIDWithString:SERVICE_UUID]]){
                [peripheral discoverCharacteristics:nil forService:service];
            }
        }
    }];

//查找到Characteristics的block
    [weakSelf.baby setBlockOnDiscoverCharacteristics:^(CBPeripheral *peripheral, CBService *service, NSError *error) {
        
        for (CBCharacteristic *c in service.characteristics) {
            if ([c.UUID isEqual:[CBUUID UUIDWithString:CHARACTERISTIC_RX]]) {
                NSLog(@"CHARACTERISTIC_RX:_____%@", c);
                self.characteristicR_x = c;
                if (c.isNotifying) {
                    [self.baby cancelNotify:peripheral characteristic:c];
                } else {
                    [self.peripheral setNotifyValue:YES forCharacteristic:c];
                }
            }
            
            if ([c.UUID isEqual:[CBUUID UUIDWithString:CHARACTERISTIC_TX]]) {
                
                self.characteristicT_x = c;
                NSLog(@"CHARACTERISTIC_TX:_____%@", c);
                if (c.isNotifying) {
                    [self.baby cancelNotify:peripheral characteristic:c];
                } else {
                    [self.peripheral setNotifyValue:YES forCharacteristic:c];
                }
            }
        }
    }];

除了这些,在实际测试中,出现了这种情况:一些型号的按摩椅带有蓝牙音箱,因此,想要通过按摩椅播放手机中的歌曲,又要通过手机 APP 控制按摩椅需要进行两次蓝牙连接.首先在 APP 中发现蓝牙设备并连接,这里是对按摩椅进行控制;其次在设置中发现设备并连接,这里相当于连接了蓝牙音箱,连接后在设置中会出现两个蓝牙名称,如下图:

附: demo 主要代码

//
//  ViewController.m
//  BLE_DEMO
//
//  Created by 张闯 on 17/5/10.
//  Copyright © 2017年 张闯. All rights reserved.
//

#import "ViewController.h"
#import "DeviceViewController.h"


@interface ViewController () <UITableViewDelegate, UITableViewDataSource>

@property (nonatomic, strong)  BabyBluetooth       *baby;
@property (nonatomic, strong)  UITableView         *tableView;
@property (nonatomic, strong)  NSMutableArray      *dataSource;

@end

@implementation ViewController

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self.baby cancelAllPeripheralsConnection];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.navigationItem.title = @"设备列表";
    
    self.tableView = [[UITableView alloc] initWithFrame:self.view.frame style:UITableViewStylePlain];
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
    [self.view addSubview:_tableView];
    
    self.dataSource = [NSMutableArray array];
    //初始化
    self.baby = [BabyBluetooth shareBabyBluetooth];
    //设置蓝牙代理方法
    [self babyDelegate];
    //扫描外设
    self.baby.scanForPeripherals().begin();
    
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:@selector(refreshBLE)];
}

- (void)refreshBLE {
    [self.dataSource removeAllObjects];
    [self.baby cancelAllPeripheralsConnection];
    self.baby.scanForPeripherals().begin();
}


//设置蓝牙委托
- (void)babyDelegate{
    
    //设置扫描到设备的委托
    __weak typeof(self) weakSelf = self;
    [weakSelf.baby setBlockOnDiscoverToPeripherals:^(CBCentralManager *central, CBPeripheral *peripheral, NSDictionary *advertisementData, NSNumber *RSSI) {
        __strong typeof(self) strongSelf = self;
        
        if (![strongSelf.dataSource containsObject:peripheral]) {
            [strongSelf.dataSource addObject:peripheral];
            [self.tableView reloadData];
        }
        
    }];
    
    //过滤器
    //设置查找设备的过滤器
    [weakSelf.baby setFilterOnDiscoverPeripherals:^BOOL(NSString *peripheralName, NSDictionary *advertisementData, NSNumber *RSSI) {
        if (peripheralName.length >1) {
            return YES;
        }
        return NO;
    }];
    
    
    //设备状态改变
    [weakSelf.baby setBlockOnCentralManagerDidUpdateState:^(CBCentralManager *central) {
        
        switch (central.state) {
            case CBManagerStatePoweredOn:
                NSLog(@"CBManagerStatePoweredOn");
                [SVProgressHUD showSuccessWithStatus:@"蓝牙已打开"];
                break;
            case CBManagerStatePoweredOff:
                NSLog(@"CBManagerStatePoweredOff");
                [SVProgressHUD showErrorWithStatus:@"蓝牙已关闭"];
                break;
            case CBManagerStateResetting:
                NSLog(@"CBManagerStateResetting");
                break;
                
            case CBManagerStateUnsupported:
                NSLog(@"CBManagerStateUnsupported");
                break;
                
            case CBManagerStateUnauthorized:
                NSLog(@"CBManagerStateUnauthorized");
                break;
                
            case CBManagerStateUnknown:
                NSLog(@"CBManagerStateUnknown");
                break;
        }
    }];
    
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return _dataSource.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
    cell.textLabel.text = [_dataSource[indexPath.row] name];
    return cell;
}


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    DeviceViewController *deviceVC = [[DeviceViewController alloc] init];
    deviceVC.peripheral = _dataSource[indexPath.row];
    [self.navigationController pushViewController:deviceVC animated:YES];
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end

//
//  DeviceViewController.m
//  BLE_DEMO
//
//  Created by 张闯 on 17/5/11.
//  Copyright © 2017年 张闯. All rights reserved.
//

#import "DeviceViewController.h"

#define SERVICE_UUID            @"XXXX"
#define CHARACTERISTIC_TX       @"XXXX"
#define CHARACTERISTIC_RX       @"XXXX"

@interface DeviceViewController ()

@property (nonatomic, strong) BabyBluetooth         *baby;
@property (nonatomic, strong) CBCharacteristic      *characteristicR_x;
@property (nonatomic, strong) CBCharacteristic      *characteristicT_x;
@property (nonatomic, strong) NSArray               *autoTypeArray;
@property (nonatomic, assign) BOOL                  isConnected;
@property (weak,   nonatomic) IBOutlet UILabel      *receivedDataLabel;

@end

@implementation DeviceViewController



- (NSArray *)autoTypeArray {
    if (!_autoTypeArray) {
        _autoTypeArray = @[@"Wake", @"Energize", @"Perform", @"Recover", @"Upper", @"Lower"];
    }
    return _autoTypeArray;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    

    self.baby = [BabyBluetooth shareBabyBluetooth];
    [self babyDelegate];
    
    //连接外设
    self.baby.having(self.peripheral).connectToPeripherals().begin();
    self.baby.characteristicDetails(self.peripheral,self.characteristicR_x);
    
}


//设置蓝牙委托
- (void)babyDelegate {
    
     __weak typeof(self) weakSelf = self;
    //连接Peripherals成功的委托
    [weakSelf.baby setBlockOnConnected:^(CBCentralManager *central, CBPeripheral *peripheral) {
        NSLog(@"已连接的设备:____%@", peripheral);
        //搜索指定服务
        [peripheral discoverServices: @[[CBUUID UUIDWithString:SERVICE_UUID]]];
        self.isConnected = YES;
        
    }];
    
    //查找服务
    [weakSelf.baby setBlockOnDiscoverServices:^(CBPeripheral *peripheral, NSError *error) {
        
        for (CBService *service in peripheral.services) {
            if([service.UUID isEqual:[CBUUID UUIDWithString:SERVICE_UUID]]){
                [peripheral discoverCharacteristics:nil forService:service];
            }
        }
    }];
    
    //设置获取到最新Characteristics值的block
    [weakSelf.baby setBlockOnReadValueForCharacteristic:^(CBPeripheral *peripheral, CBCharacteristic *characteristic, NSError *error) {
        char rData[999];
        int len = (int)characteristic.value.length;
        [characteristic.value getBytes:rData length:len];
        NSData *d = [[NSData alloc] initWithBytes:rData length:len];
        
        if (d.length == 19) {
            self.receivedDataLabel.text = [self transferData:d];
        }
    }];
    
    
    //查找到Characteristics的block
    [weakSelf.baby setBlockOnDiscoverCharacteristics:^(CBPeripheral *peripheral, CBService *service, NSError *error) {
        
        for (CBCharacteristic *c in service.characteristics) {
            if ([c.UUID isEqual:[CBUUID UUIDWithString:CHARACTERISTIC_RX]]) {
                NSLog(@"CHARACTERISTIC_RX:_____%@", c);
                self.characteristicR_x = c;
                if (c.isNotifying) {
                    [self.baby cancelNotify:peripheral characteristic:c];
                } else {
                    [self.peripheral setNotifyValue:YES forCharacteristic:c];
                }
            }
            
            if ([c.UUID isEqual:[CBUUID UUIDWithString:CHARACTERISTIC_TX]]) {
                
                self.characteristicT_x = c;
                NSLog(@"CHARACTERISTIC_TX:_____%@", c);
                if (c.isNotifying) {
                    [self.baby cancelNotify:peripheral characteristic:c];
                } else {
                    [self.peripheral setNotifyValue:YES forCharacteristic:c];
                }
            }
        }
    }];
    
    
    //characteristic订阅状态改变的block
    [weakSelf.baby setBlockOnDidUpdateNotificationStateForCharacteristic:^(CBCharacteristic *characteristic, NSError *error) {
        NSLog(@"uid:%@,isNotifying:%@",characteristic.UUID,characteristic.isNotifying?@"on":@"off");
    }];
    
    //写Characteristic成功后的block
    [weakSelf.baby setBlockOnDidWriteValueForCharacteristic:^(CBCharacteristic *characteristic, NSError *error) {
        NSLog(@"t_xCBCharacteristic: ____ %@", characteristic);
    }];

    
    //断开Peripherals的连接
    [weakSelf.baby setBlockOnDisconnect:^(CBCentralManager *central, CBPeripheral *peripheral, NSError *error) {
        NSLog(@"%@", peripheral);
        
        if ([peripheral isEqual:self.peripheral]) {
            [SVProgressHUD showErrorWithStatus:@"断开链接了"];
            self.isConnected = NO;
        }

    }];
    
    
}

- (IBAction)send:(id)sender {
    [self writeData:0x01];
}

- (IBAction)auto1:(id)sender {
    [self writeData:0x10];
}

- (IBAction)auto2:(id)sender {
    [self writeData:0x11];
}

- (IBAction)auto3:(id)sender {
    [self writeData:0x12];
}
- (IBAction)auto4:(id)sender {
    [self writeData:0x13];
    
}
- (IBAction)auto5:(id)sender {
    [self writeData:0x14];
}
- (IBAction)auto6:(id)sender {
    [self writeData:0x15];
}

- (void)writeData:(int)senderId {
    
    NSMutableData *data = [NSMutableData data];
    uint8_t tmp[10];
    uint8_t checksum = 0;
    tmp[0] = 0xF0;
    tmp[1] = 0x03;
    tmp[2] = senderId;
    checksum = tmp[1] + tmp[2];
    checksum = ~checksum;
    checksum = checksum & 0x7f;
    tmp[3] = checksum;
    tmp[4] = 0xF1;
    [data appendBytes:(void *)(&tmp) length:5];
    
    //写入数据
    if (self.isConnected) {
        [self.peripheral writeValue:data forCharacteristic:self.characteristicT_x type:CBCharacteristicWriteWithResponse];
    } else {
        [SVProgressHUD showErrorWithStatus:@"连接已断开"];
    }
    
    
}

- (NSString *)transferData:(NSData *)data {
    
    uint8_t *readTempBuffer = (uint8_t*)[data bytes];

    //运行状态
    int nChairRunState = (readTempBuffer[7]) & 0xf;
    //手动判断
    int nChairAutoType = (readTempBuffer[16] >> 2) & 0x0f;
    
    if (nChairAutoType && nChairRunState == 3) {
        return self.autoTypeArray[nChairAutoType-1];
    } else {
        return @"none";
    }
    
}



- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end