title: Writable characteristic inside the core bluetooth
body: <p>I am working with the core bluetooth . I have added the functionality to write/read on the characteristics . Before that I want to check whether the characteristic is writable or not . I have used the characteristic.properties for this purpose my code is :</p>
  
  <pre><code>    if (characteristic.properties==CBCharacteristicPropertyRead)
      {
          [peripheralDevice readValueForCharacteristic:characteristic];
      }
      else if(characteristic.properties==CBCharacteristicPropertyWrite)
      {
          [peripheralDevice setNotifyValue:YES forCharacteristic:characteristic];
      }
    NSLog(@"the property :%d",currentCharacteristic.properties );
  </code></pre>
  
  <p>here is the enum for the Characteristic.properties from the documentation :</p>
  
  <pre><code>typedef NS_ENUM(NSInteger, CBCharacteristicProperties) {
      CBCharacteristicPropertyBroadcast                                               = 0x01,
      CBCharacteristicPropertyRead                                                    = 0x02,
      CBCharacteristicPropertyWriteWithoutResponse                                    = 0x04,
      CBCharacteristicPropertyWrite                                                   = 0x08,
      CBCharacteristicPropertyNotify                                                  = 0x10,
      CBCharacteristicPropertyIndicate                                                = 0x20,
      CBCharacteristicPropertyAuthenticatedSignedWrites                               = 0x40,
      CBCharacteristicPropertyExtendedProperties                                      = 0x80,
      CBCharacteristicPropertyNotifyEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)     = 0x100,
      CBCharacteristicPropertyIndicateEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)   = 0x200
  };
  </code></pre>
  
  <p>Its working fine for the reading the value from the characteristic. But problem is while writing the value it is not going inside the second loop. I have set the characteristic with the writable property . I am getting the 136 in print statement for both of the peripheral on which I have checked . Please suggest some solution to overcome this problem ?</p>