#import <CoreBluetooth/CoreBluetooth.h>  CBCentralManager *manager;  manager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];  

- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral  {            NSLog(@"Did connect to peripheral: %@", peripheral);      _testPeripheral = peripheral;            [peripheral setDelegate:self];  
//查找服務    [peripheral discoverServices:nil];              } 

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error  {              NSLog(@"didDiscoverServices");            if (error)      {          NSLog(@"Discovered services for %@ with error: %@", peripheral.name, [error localizedDescription]);                    if ([self.delegate respondsToSelector:@selector(DidNotifyFailConnectService:withPeripheral:error:)])              [self.delegate DidNotifyFailConnectService:nil withPeripheral:nil error:nil];                    return;      }              for (CBService *service in peripheral.services)      {           //發現服務        if ([service.UUID isEqual:[CBUUID UUIDWithString:UUIDSTR_ISSC_PROPRIETARY_SERVICE]])          {              NSLog(@"Service found with UUID: %@", service.UUID);  
//查找特征            [peripheral discoverCharacteristics:nil forService:service];              break;          }                          }  }

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{        if (error)    {        NSLog(@"Discovered characteristics for %@ with error: %@", service.UUID, [error localizedDescription]);                [self error];        return;    }        NSLog(@"服務：%@",service.UUID);    for (CBCharacteristic *characteristic in service.characteristics)    {       //發現特征            if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:@"xxxxxxx"]]) {                NSLog(@"監聽：%@",characteristic);
//監聽特征                [self.peripheral setNotifyValue:YES forCharacteristic:characteristic];            }            }}

- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{    if (error)    {        NSLog(@"Error updating value for characteristic %@ error: %@", characteristic.UUID, [error localizedDescription]);        self.error_b = BluetoothError_System;        [self error];        return;    }    //    NSLog(@"收到的數據：%@",characteristic.value);    [self decodeData:characteristic.value];}

NSData *d2 = [[PBABluetoothDecode sharedManager] HexStringToNSData:@"0x02"];                [self.peripheral writeValue:d2 forCharacteristic:characteristic type:CBCharacteristicWriteWithoutResponse];