/// <summary> Called to return the PDU for this type of object </summary>
/// <returns> A byte array </returns>
public byte[] GetPDU()
{
if (UserData.Headers.Count > 0)
EsmClass |= 0x40;
SmppBuffer tmpBuff = new SmppBuffer(DefaultEncoding, this);
tmpBuff.AddCString(ServiceType);
tmpBuff.AddByte(SourceTon);
tmpBuff.AddByte(SourceNpi);
tmpBuff.AddCString(SourceAddr);
tmpBuff.AddDestinationAddresses(DestinationAddresses);
tmpBuff.AddByte(EsmClass);
tmpBuff.AddByte(ProtocolId);
tmpBuff.AddByte(PriorityFlag);
tmpBuff.AddTimeString(ScheduleDeliveryTime, 17);
tmpBuff.AddTimeString(ValidityPeriod, 17);
tmpBuff.AddByte(RegisteredDelivery);
tmpBuff.AddByte(ReplaceIfPresent);
tmpBuff.AddByte(Convert.ToByte(DataCoding));
tmpBuff.AddByte(DefaultMsgId);
tmpBuff.AddUserData(UserData);
tmpBuff.AddTLVCollection(Optional);
tmpBuff.AddFinalLength();
return tmpBuff.Buffer;
}