bluetooth_lock_demo
电子蓝牙锁 开锁.
- 开启蓝牙模块
//【*必须*】持有发现的设备,如果不持有设备会导致CBPeripheralDelegate方法不能正确回调
_discoverPeripherals = [NSMutableArray array];
//初始化中心端,开始蓝牙模块
self.centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil options:nil];
self.centralManager.delegate = self;2.蓝牙状态
// 状态更新后触发
- (void)centralManagerDidUpdateState:(CBCentralManager *)central {
switch (central.state) {
case CBManagerStatePoweredOff:{
NSLog(@"蓝牙关闭");
//检测到蓝牙没打开需要通知代理控制器去执行相关提示操作
if (self.delegate && [self.delegate respondsToSelector:@selector(ble_openBluetooth)])
{
[self.delegate ble_openBluetooth];
};
}
break;
case CBManagerStatePoweredOn:
break;
case CBManagerStateResetting:
break;
case CBManagerStateUnauthorized:
break;
case CBManagerStateUnknown:
break;
case CBManagerStateUnsupported:
break;
default:
break;
}
// 开始扫描外设
NSDictionary *options = @{CBCentralManagerScanOptionAllowDuplicatesKey:@NO};
[central scanForPeripheralsWithServices:nil options:options];
}- 扫到指定外设并连接该设备，会多次回调
// 扫描到外部设备后触发的代理方法//多次调用的
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(nonnull CBPeripheral *)peripheral advertisementData:(nonnull NSDictionary<NSString *,id> *)advertisementData RSSI:(nonnull NSNumber *)RSSI {
NSString *msg = [NSString stringWithFormat:@"信号强度: %@, 外设: %@", RSSI, peripheral];
NSLog(@"%@",msg);
if ([peripheral.name.lowercaseString containsString:_model.peripheral_name.lowercaseString]) {
//【*必须*】如果比放入数组，可能出现问题，已验证
[_discoverPeripherals addObject:peripheral];
//连接外部设备
[central connectPeripheral:peripheral options:nil];
//停止搜索
[central stopScan];
}
}- 连上外设后搜索设备发出的服务Services
// 当中心端连接上外设时触发
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral {
NSLog(@"连接上外设");
[central stopScan];
if ([self.delegate respondsToSelector:@selector(ble_connectSucceed)]) {
[self.delegate ble_connectSucceed];
}
_peripheral = peripheral;
peripheral.delegate = self;
// 发现服务
[peripheral discoverServices:nil];
}- 识别搜索到外设服务 _model.service_uuid_fragments是目标服务列表
// 外设端发现了服务时触发
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error {
if (error) {
NSLog(@">>>Discovered services for %@ with error: %@", peripheral.name, [error localizedDescription]);
return;
}
for (CBService *service in peripheral.services) {
// 过滤目标服务
for (NSString *ser_uuid in _model.service_uuid_fragments) {
if([service.UUID.UUIDString.lowercaseString containsString:ser_uuid.lowercaseString]) {
// 对指定服务进行【发现特征】 操作
[peripheral discoverCharacteristics:nil forService:service];
break;
}
}
}
}- 发现到了特征，记录和处理指定特征,一般一个服务器会有2个特征,一个读数据，一个写数据,根据uuid区分并记录下来。
// 发现到服务特征
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error {
NSLog(@"%@",service.characteristics);
for (CBCharacteristic *characteristic in service.characteristics) {
// 过滤特征 找到【notify特征】和【写数据特征】
if([characteristic.UUID.UUIDString.lowercaseString isEqualToString:_model.characteristics_name.lowercaseString]) {
self.characteristic = characteristic;
}
if([characteristic.UUID.UUIDString.lowercaseString isEqualToString:_model.notify_characteristics_name.lowercaseString]) {
self.notifyCharteristic = characteristic;
// 注：实现下面方法才能读取到notifyCharteristic回调方法
[peripheral discoverDescriptorsForCharacteristic:characteristic];
}
}
// 写数据
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self writeData];
});
}- 写数据，写数据用写数据的特征对象
- (void)writeData {
NSData *date = [NSString hexToBytes:_model.token];
[self sendMsgWithSubPackage:date peripheral:_peripheral characteristic:_characteristic];
NSLog(@"写入data:%@",date);
}
// 单次发包最大字节长度
static int BLE_SEND_MAX_LEN = 20;
// 处理了如果超过20字节，会采用分包发送蓝牙数据
- (void)sendMsgWithSubPackage:(NSData*)msgData peripheral:(CBPeripheral*)peripheral characteristic:(CBCharacteristic*)character {
for (int i = 0; i < [msgData length]; i += BLE_SEND_MAX_LEN) {
// 预加 最大包长度，如果依然小于总数据长度，可以取最大包数据大小
if ((i + BLE_SEND_MAX_LEN) < [msgData length]) {
NSString *rangeStr = [NSString stringWithFormat:@"%i,%i", i, BLE_SEND_MAX_LEN];
NSData *subData = [msgData subdataWithRange:NSRangeFromString(rangeStr)];
NSLog(@"%@",subData);
[_peripheral writeValue:subData forCharacteristic:_characteristic type:0x04];
// notify特性的值设置通知或指示。有通知会回调代理方法didUpdateValueForCharacteristic，在代理方法中拿到通知的内容
[_peripheral setNotifyValue:YES forCharacteristic:_notifyCharteristic];
//根据接收模块的处理能力做相应延时
usleep(20 * 1000);
}
else {
NSString *rangeStr = [NSString stringWithFormat:@"%i,%i", i, (int)([msgData length] - i)];
NSData *subData = [msgData subdataWithRange:NSRangeFromString(rangeStr)];
[_peripheral writeValue:subData forCharacteristic:_characteristic type:0x04];
// notify特性的值设置通知或指示。有通知会回调代理方法didUpdateValueForCharacteristic，在代理方法中拿到通知的内容
[_peripheral setNotifyValue:YES forCharacteristic:_notifyCharteristic];
usleep(20 * 1000);
}
}
}- 读取特征值，拿到读的特征对象，读取写数据后的反馈内容
// 收到数据,会掉该方法通知代理接受数据，并解析数据
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error {
// 数据解析成的十六进制字符串
NSString *hexStr = [characteristic.value convertDataToHexStr];
NSLog(@"characteristic uuid:%@ value:%@ 解析后的十六进制字符串:%@",characteristic.UUID,characteristic.value,hexStr);
if ([self.delegate respondsToSelector:@selector(ble_receivedValue:)]) {
[self.delegate ble_receivedValue:hexStr];
}
}