code: func (tp *TransportProtocol) String() string {
  	if tp == nil {
  		return tcp
  	}
  	switch *tp {
  	case TransportProtocolUDP:
  		return udp
  	case TransportProtocolTCP:
  		return tcp
  	default:
  		seelog.Critical("Unknown TransportProtocol type!")
  		return tcp
  	}
  }
docs: // String converts TransportProtocol to a string