ios - IOS 7中如何将警报级别写入警报级别的特征？

Question

我是 iOS 开发新手，正在研究适用于 IOS 的蓝牙低功耗(BLE、蓝牙 4.0)。

我想知道如何在 IOS 7 上使用即时警报服务。

我可以从BLE 设备扫描、连接和发现服务。 接下来是连接到立即警报服务并将警报级别特征写入BLE设备.

我定义了即时警报服务的UUID和警报级别，如以下代码所示。

#define IMMEDIATE_ALERT_UUID           @"00001802-0000-1000-8000-00805f9b34fb"
#define ALERT_LEVEL_UUID    @"00002a06-0000-1000-8000-00805f9b34fb"

以下代码用于连接到即时警报服务。

[peripheral discoverServices:@[[CBUUID UUIDWithString:IMMEDIATE_ALERT_UUID]]];

连接到IMMEDIATE_ALERT_UUID后连接到警报级别特征的代码类似于以下。

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{
    for (CBService *service in peripheral.services) {
        [peripheral discoverCharacteristics:@[[CBUUID UUIDWithString:ALERT_LEVEL_UUID]] forService:service];
    }
}

订阅警报级别的特征。

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
      if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:ALERT_LEVEL_UUID]]) {

            // If it is, subscribe to it
            [peripheral setNotifyValue:YES forCharacteristic:characteristic];
        }
}

但是如何将警报级别写入警报级别的特征??

提前致谢。

Answer 1

-(void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{
    if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:ALERT_LEVEL_UUID]]){

    uint8_t val = 0 //enter the value which you want to write.
    NSData* valData = [NSData dataWithBytes:(void*)&val length:sizeof(val)];

    [peripheral writeValue:valData forCharacteristic:characteristictype:CBCharacteristicWriteWithResponse];
}

传入参数CBCharacteristicWriteWithResponse将会调用CBPeripheralDelegate方法 - (void)外设:(CBPeripheral *)外设 didWriteValueForCharacteristic:(CBCharacteristic *)特征错误:(NSError *)error{ }