msg := ies.NGSetupRequest{    // need check all mandatory fields
  GlobalRANNodeID: ...
  SupportedTAList: ...
  DefaultPagingDRX: ...
}

// encode
var b []byte
var err error
b, err = NgapEncode(&msg)

// decode
var pdu NgapPdu
var cridia *ies.CriticalityDiagnostics
pdu, err, cridia = NgapDecode(b)
decode_msg := pdu.Message.Msg.(*ies.NGSetupRequest)

ie := ies.PDUSessionResourceSetupResponseTransfer{
  // check mandatory fields
}

// encode
var b []byte
var err error
b, err = ie.Encode()

// decode
var decode_transfer ies.PDUSessionResourceSetupResponseTransfer{}
err = decode_transfer.Decode(b)