How to add bluetooth keypad support in iOS apps

Using (NSArray *)keyCommands

, I can get key events for all alphanumeric characters, symbols, etc. I tried to subclass UIApplication

and override(NSArray *)keyCommands method

 -(NSArray *)keyCommands{

    UIKeyCommand *cmdF1    = [UIKeyCommand keyCommandWithInput:[NSString stringWithFormat:@"%c",asciicode] modifierFlags:0 action:@selector(handleShortcut:)];

    ........

    return @[cmdF1,cmdF2....];
  }

      

        
        
        
      

    

In my application, I need F1-F12 Key keys, as well as Home, End, PageUp keys in the application. Is there any public api available for this? Can we connect a keyboard using other blue tooth services?