DiscoverCharacteristics for service

ViewController

func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
  
   if let charac = service.characteristics {
    for characteristic in charac {
      //MARK:- Light Value
      if characteristic.uuid == Digital {
      self.lighCharacteristics = characteristic
      }
    }
  }
}