蓝牙硬件交互数据传输Demo

#import "ViewController.h"
#import <CoreBluetooth/CoreBluetooth.h>

@interface ViewController ()<CBCentralManagerDelegate,CBPeripheralDelegate>
/// 中央管理者 -->管理设备的扫描 --连接
@property (nonatomic, strong) CBCentralManager *centralManager;
// 存储的设备
@property (nonatomic, strong) NSMutableArray *peripherals;
// 扫描到的设备
@property (nonatomic, strong) CBPeripheral *cbPeripheral;
// 文本
@property (weak, nonatomic) IBOutlet UITextView *peripheralText;
// 蓝牙状态
@property (nonatomic, assign) CBManagerState peripheralState;

@end

// 蓝牙4.0设备名
static NSString * const kBlePeripheralName = @"apple";
// 通知服务
static NSString * const kNotifyServerUUID = @"FFE0";
// 写服务
static NSString * const kWriteServerUUID = @"FFE1";
// 通知特征值
static NSString * const kNotifyCharacteristicUUID = @"FFE2";
// 写特征值
static NSString * const kWriteCharacteristicUUID = @"FFE1";

@implementation ViewController
- (NSMutableArray *)peripherals
{
    if (!_peripherals) {
        _peripherals = [NSMutableArray array];
    }
    return _peripherals;
}

- (CBCentralManager *)centralManager
{
    if (!_centralManager)
    {
        _centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
    }
    return _centralManager;
}

// 222  扫描设备
- (IBAction)scanForPeripherals
{
    [self.centralManager stopScan];
    NSLog(@"扫描设备");
    [self showMessage:@"扫描设备"];
    if (self.peripheralState ==  CBManagerStatePoweredOn)
    {
        [self.centralManager scanForPeripheralsWithServices:nil options:nil];
    }
}

// 连接设备
- (IBAction)connectToPeripheral
{
    if (self.cbPeripheral != nil)
    {
        NSLog(@"连接设备");
        [self showMessage:@"连接设备"];
        [self.centralManager connectPeripheral:self.cbPeripheral options:nil];
    }
    else
    {
        [self showMessage:@"无设备可连接"];
    }
}

// 清空设备
- (IBAction)clearPeripherals
{
    NSLog(@"清空设备");
    [self.peripherals removeAllObjects];
    self.peripheralText.text = @"";
    [self showMessage:@"清空设备"];
    
    if (self.cbPeripheral != nil)
    {
        // 取消连接
        NSLog(@"取消连接");
        [self showMessage:@"取消连接"];
        [self.centralManager cancelPeripheralConnection:self.cbPeripheral];
    }
}
//000
- (void)viewDidLoad {
    [super viewDidLoad];
    [self centralManager];
}
///111
//只要中心管理者初始化 就会触发此代理方法 判断手机蓝牙状态   状态更新时调用
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
    switch (central.state) {
        case CBManagerStateUnknown:{
            NSLog(@"为知状态");
            self.peripheralState = central.state;
        }
            break;
        case CBManagerStateResetting:
        {
            NSLog(@"重置状态");
            self.peripheralState = central.state;
        }
            break;
        case CBManagerStateUnsupported:
        {
            NSLog(@"不支持的状态");
            self.peripheralState = central.state;
        }
            break;
        case CBManagerStateUnauthorized:
        {
            NSLog(@"未授权的状态");
            self.peripheralState = central.state;
        }
            break;
        case CBManagerStatePoweredOff:
        {
            NSLog(@"关闭状态");
            self.peripheralState = central.state;
        }
            break;
        case CBManagerStatePoweredOn:
        {
            NSLog(@"开启状态－可用状态");
            self.peripheralState = central.state;
            // 链接成功开始扫描设备
            [self scanForPeripherals];
            NSLog(@"%ld",(long)self.peripheralState);
        }
            break;
        default:
            break;
    }
}
/**
 333扫描到设备  发现设备是开启状态后调用方法
 
 @param central 中心管理者
 @param peripheral 扫描到的设备
 @param advertisementData 广告信息
 @param RSSI 信号强度
 */
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI
{
    [self showMessage:[NSString stringWithFormat:@"发现设备,设备名:%@",peripheral.name]];
    // 设备数组中是否存在 该设备
    if (![self.peripherals containsObject:peripheral])
    {
        [self.peripherals addObject:peripheral];
        NSLog(@"%@",peripheral);
        
        [self showMessage:[NSString stringWithFormat:@"设备名:%@",peripheral.name]];
        
        //最常用的场景是查找某一个前缀开头的设备
//        if ([peripheral.name hasPrefix:@"JDY"] ) {
            [self showMessage:@"开始连接"];
            [self.centralManager connectPeripheral:peripheral options:nil];
//        }
    }
}

/**
 连接失败
 
 @param central 中心管理者
 @param peripheral 连接失败的设备
 @param error 错误信息
 */

- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
    [self showMessage:@"连接失败"];
    if ([peripheral.name isEqualToString:kBlePeripheralName])
    {
        [self.centralManager connectPeripheral:peripheral options:nil];
    }
}

/**
 连接断开
 
 @param central 中心管理者
 @param peripheral 连接断开的设备
 @param error 错误信息
 */

- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
    [self showMessage:@"断开连接"];
    if ([peripheral.name isEqualToString:kBlePeripheralName])
    {
        [self.centralManager connectPeripheral:peripheral options:nil];
    }
}

/**
 444连接成功
 
 @param central 中心管理者
 @param peripheral 连接成功的设备
 */
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
    NSLog(@"连接设备:%@成功",peripheral.name);
//    self.peripheralText.text = [NSString stringWithFormat:@"连接设备:%@成功",peripheral.name];
    [self showMessage:[NSString stringWithFormat:@"连接设备:%@成功",peripheral.name]];
   // 设备
    self.cbPeripheral = peripheral;
    // 设置设备的代理
    peripheral.delegate = self;
    // services:传入nil  代表扫描所有服务
    [peripheral discoverServices:nil];
}

/**
 555扫描到服务
 
 @param peripheral 服务对应的设备
 @param error 扫描错误信息
 */
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{
    // 遍历所有的服务
    for (CBService *service in peripheral.services)
    {
        NSLog(@"服务:%@",service.UUID.UUIDString);
        // 获取对应的服务
        if ([service.UUID.UUIDString isEqualToString:kWriteServerUUID] || [service.UUID.UUIDString isEqualToString:kNotifyServerUUID])
        {
            // 根据服务去扫描特征
            [peripheral discoverCharacteristics:nil forService:service];
        }
    }
}

/**
 666扫描到对应的特征
 
 @param peripheral 设备
 @param service 特征对应的服务
 @param error 错误信息
 */
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
    // 遍历所有的特征
    for (CBCharacteristic *characteristic in service.characteristics)
    {
        
        NSLog(@"特征值:%@",characteristic.UUID.UUIDString);
        if ([characteristic.UUID.UUIDString isEqualToString:kNotifyCharacteristicUUID])
        {
            // 写入数据 M_1_1000_

            NSString *testString = [NSString stringWithFormat:@"%@",@"M_1_1000_
"];
            NSData *data = [testString dataUsingEncoding: NSUTF8StringEncoding];
            
//            NSData *data = [self hexToBytes:testString];
//            Byte byte[] = {0xf0, 0x3d, 0x3d, 0x5d,0x02,0xf7};
//            NSData *data = [NSData dataWithBytes:byte length:6];
            [self.cbPeripheral writeValue:data forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];
            [self showMessage:@"写入特征值"];
            
            
//            for (Byte i = 0x0; i < 0x73; i++)
//            {
//                Byte byte[] = {0xf0, 0x3d, 0x3d, i,
//                    0x02,0xf7};
//                NSData *data = [NSData dataWithBytes:byte length:6];
//                [peripheral writeValue:data forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];
//            }
        }
        if ([characteristic.UUID.UUIDString isEqualToString:kNotifyCharacteristicUUID])
        {
            [peripheral setNotifyValue:YES forCharacteristic:characteristic];
        }
    }
}

- (void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error;
{
    //这个方法比较好，这个是你发数据到外设的某一个特征值上面，并且响应的类型是 CBCharacteristicWriteWithResponse ，上面的官方文档也有，如果确定发送到外设了，就会给你一个回应，当然，这个也是要看外设那边的特征值UUID的属性是怎么设置的,看官方文档，人家已经说了，条件是，特征值UUID的属性：CBCharacteristicWriteWithResponse
    if (!error) {
        NSLog(@"说明发送成功，characteristic.uuid为：%@ 发送为%@",[characteristic.UUID UUIDString],characteristic.value);
        Byte byte2[] = {0xf0, 0x3d, 0x3d, 0x5d,0x02,0xf7};
        NSData* data2 = [[NSData alloc] initWithBytes:byte2 length:3];
        if ([characteristic.value isEqualToData:data2]) {
            NSLog(@"说明发送成功，characteristic.uuid为：%@ 发送为%@",[characteristic.UUID UUIDString],characteristic.value);
        }
    }else{
        NSLog(@"发送失败了啊！characteristic.uuid为：%@  原因:%@",[characteristic.UUID UUIDString],error);
        
    }
    //调用下面的方法后 会调用到代理的- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
    [peripheral readValueForCharacteristic:characteristic];
}

/**
 根据特征读到数据
 
 @param peripheral 读取到数据对应的设备
 @param characteristic 特征
 @param error 错误信息
 */
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(nonnull CBCharacteristic *)characteristic error:(nullable NSError *)error
{
    if ([characteristic.UUID.UUIDString isEqualToString:kNotifyCharacteristicUUID])
    {
        NSData *data = characteristic.value;
        NSLog(@"%@",data);
//        2017-04-25 12:34:41.876974+0800 蓝牙4.0Demo[1745:346611] <9f5436>
//        2017-04-25 12:34:41.983016+0800 蓝牙4.0Demo[1745:346611] <8f5440>
//        2017-04-25 12:34:42.154821+0800 蓝牙4.0Demo[1745:346611] <9f5649>
//        2017-04-25 12:34:42.239481+0800 蓝牙4.0Demo[1745:346611] <8f5640>
    }
}



- (void)showMessage:(NSString *)message
{
    self.peripheralText.text = [self.peripheralText.text stringByAppendingFormat:@"%@
",message];
    [self.peripheralText scrollRectToVisible:CGRectMake(0, self.peripheralText.contentSize.height -15, self.peripheralText.contentSize.width, 10) animated:YES];
}

// 把string类型转成byte  之后转成data
-(NSData*)hexToBytes:(NSString *)string{
    NSMutableData* data = [[NSMutableData alloc]init];
    int idx;
    for (idx = 0; idx+2 <= string.length; idx +=2) {
        NSRange range = NSMakeRange(idx, 2);
        NSString* hexStr = [string substringWithRange:range];
        NSScanner* scanner = [NSScanner scannerWithString:hexStr];
        unsigned int intValue;
        [scanner scanHexInt:&intValue];
        [data appendBytes:&intValue length:1];
    }
    return data;
}

//data转string
- (NSString *)hexStringFromData:(NSData*)data{
    return [[[[NSString stringWithFormat:@"%@",data]
              stringByReplacingOccurrencesOfString: @"<" withString: @""]
             stringByReplacingOccurrencesOfString: @">" withString: @""]
            stringByReplacingOccurrencesOfString: @" " withString: @""];
}

@end