智能设备 和 app 通过 BLE通讯的两种模型
模型一：设备提供数据，app 展示数据； 比如小米手环
模型二：app提供数据，设备接收；
模型与corebluetooth的对应关系；
模型一：智能设备，对应 peripheral；app对应central
模型二：智能设备作为central ； app作为 peripheral
这里主要讨论模型一，这也是当前大多数手环设备和iOS 交互的方式；开发流程
1. 创建工程，导入CoreBluetooth.framework
2. 初始化 CBCentralManager 并准备扫描周围蓝牙设备
//初始化
theManager = [[CBCentralManager alloc]initWithDelegate:self queue:nil];
//初始化完成会调用如下代理，返回当前手机的蓝牙状态//当前蓝牙主设备状态
-(void)centralManagerDidUpdateState:(CBCentralManager *)central{
ifstate==CBCentralManagerStatePoweredOn) {
self.title@"蓝牙已就绪";
self.connectBtn.enabledYES;
else
{
self.title@"蓝牙未准备好";
self.activeIDstopAnimating];
switchstate) {
caseCBCentralManagerStateUnknown:
NSLog(@">>>CBCentralManagerStateUnknown");
break;
caseCBCentralManagerStateResetting:
NSLog(@">>>CBCentralManagerStateResetting");
break;
caseCBCentralManagerStateUnsupported:
NSLog(@">>>CBCentralManagerStateUnsupported");
break;
caseCBCentralManagerStateUnauthorized:
NSLog(@">>>CBCentralManagerStateUnauthorized");
break;
caseCBCentralManagerStatePoweredOff:
NSLog(@">>>CBCentralManagerStatePoweredOff");
break;
default:
break;
}
}
}
3. 当蓝牙状态一切正常时，这时可以开始搜索周边设备了，比如手环
//开始连接action
- (IBAction)startConnectAction:(id)sender {
if (theManager.state==CBCentralManagerStatePoweredOn) {
NSLog(@"主设备蓝牙状态正常，开始扫描外设...");
self.title = @"扫描小米手环...";
//nil表示扫描所有设备
[theManager scanForPeripheralsWithServices:nil options:nil];
[self.activeID startAnimating];
self.connectBtn.enabled = NO;
self.resultTextV.text = @"";
}
}
4. 在扫描到设备的代理里面，连接我们找到的智能设备
//扫描到设备会进入方法
-(void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI{
NSLog(@"扫描连接外设：%@ %@",peripheral.name,RSSI);
[central connectPeripheral:peripheral options:nil];
if ([peripheral.name hasSuffix:@"MI"]) {
thePerpher = peripheral;
[central stopScan];
[central connectPeripheral:peripheral options:nil];
self.title = @"发现小米手环，开始连接...";
self.resultTextV.text = [NSString stringWithFormat:@"发现手环：%@\n名称：%@\n",peripheral.identifier.UUIDString,peripheral.name];
}
}
5. 连接成功之后，去扫描设备的服务；扫描到服务之后，紧接着去扫描设备的特征；好比一个类提供的接口，只有知道这些，我们才能操作智能设备
//扫描到特征
-(void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{
if (error)
{
NSLog(@"扫描外设的特征失败！%@->%@-> %@",peripheral.name,service.UUID, [error localizedDescription]);
self.title = @"find characteristics error.";
[self.activeID stopAnimating];
self.connectBtn.enabled = YES;
return;
}
NSLog(@"扫描到外设服务特征有：%@->%@->%@",peripheral.name,service.UUID,service.characteristics);
//获取Characteristic的值
for (CBCharacteristic *characteristic in service.characteristics){
{
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
//步数
if ([characteristic.UUID.UUIDString isEqualToString:kMI_STEP])
{
[peripheral readValueForCharacteristic:characteristic];
}
//电池电量
else if ([characteristic.UUID.UUIDString isEqualToString:kMI_BUTERY])
{
[peripheral readValueForCharacteristic:characteristic];
}
else if ([characteristic.UUID.UUIDString isEqualToString:kMI_SHAKE])
{
//震动
theSakeCC = characteristic;
}
//设备信息
else if ([characteristic.UUID.UUIDString isEqualToString:kMI_DEVICE])
{
[peripheral readValueForCharacteristic:characteristic];
}
}
}
}
//扫描到服务
-(void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{
if (error)
{
NSLog(@"扫描外设服务出错：%@-> %@", peripheral.name, [error localizedDescription]);
self.title = @"find services error.";
[self.activeID stopAnimating];
self.connectBtn.enabled = YES;
return;
}
NSLog(@"扫描到外设服务：%@ -> %@",peripheral.name,peripheral.services);
for (CBService *service in peripheral.services) {
[peripheral discoverCharacteristics:nil forService:service];
}
NSLog(@"开始扫描外设服务的特征 %@...",peripheral.name);
}
#pragma mark 设备扫描与连接的代理
//连接到Peripherals-成功
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
self.title = @"连接成功，扫描信息...";
NSLog(@"连接外设成功！%@",peripheral.name);
[peripheral setDelegate:self];
[peripheral discoverServices:nil];
NSLog(@"开始扫描外设服务 %@...",peripheral.name);
}
//连接外设失败
-(void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
NSLog(@"连接到外设 失败！%@ %@",[peripheral name],[error localizedDescription]);
[self.activeID stopAnimating];
self.title = @"连接失败";
self.connectBtn.enabled = YES;
}
//与外设断开连接
- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error{
NSLog(@"与外设备断开连接 %@: %@", [peripheral name], [error localizedDescription]);
self.title = @"连接已断开";
self.connectBtn.enabled = YES;
}
View Code
6. 当我们对设备发送一些指令时，会在如下代理里面响应到设备返回的数据
#pragma mark 设备信息处理
//扫描到具体的值
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error
{
if (error) {
NSLog(@"扫描外设的特征失败！%@-> %@",peripheral.name, [error localizedDescription]);
self.title = @"find value error.";
return;
}
NSLog(@"%@ %@",characteristic.UUID.UUIDString,characteristic.value);
if ([characteristic.UUID.UUIDString isEqualToString:kMI_STEP]) {
Byte *steBytes = (Byte *)characteristic.value.bytes;
int steps = TCcbytesValueToInt(steBytes);
NSLog(@"步数：%d",steps);
self.resultTextV.text = [NSString stringWithFormat:@"%@步数：%d\n",self.resultTextV.text,steps];
}
else if ([characteristic.UUID.UUIDString isEqualToString:kMI_BUTERY])
{
Byte *bufferBytes = (Byte *)characteristic.value.bytes;
int buterys = TCcbytesValueToInt(bufferBytes)&0xff;
NSLog(@"电池：%d%%",buterys);
self.resultTextV.text = [NSString stringWithFormat:@"%@电量：%d%%\n",self.resultTextV.text,buterys];
}
else if ([characteristic.UUID.UUIDString isEqualToString:kMI_DEVICE])
{
Byte *infoByts = (Byte *)characteristic.value.bytes;
//这里解析infoByts得到设备信息
}
[self.activeID stopAnimating];
self.connectBtn.enabled = YES;
self.title = @"信息扫描完成";
}
View Code
7. 完整的代码工程；
https://github.com/cocoajin/BLE-miband
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
