Writable characteristic inside the core bluetooth

Question

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 :

    if (characteristic.properties==CBCharacteristicPropertyRead)
    {
        [peripheralDevice readValueForCharacteristic:characteristic];
    }
    else if(characteristic.properties==CBCharacteristicPropertyWrite)
    {
        [peripheralDevice setNotifyValue:YES forCharacteristic:characteristic];
    }
  NSLog(@"the property :%d",currentCharacteristic.properties );

here is the enum for the Characteristic.properties from the documentation :

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
};

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 ?

Answer 1

solved this by using ANDing operation:

 if (characteristic.properties&CBCharacteristicPropertyRead!=0)
 {
      [peripheralDevice readValueForCharacteristic:characteristic];
 }