/// <summary> Adds the more message pay load </summary>
/// <param name="data"></param>
public void AddMessagePayload(byte[] data)
{
SmppBuffer tmpBuff = new SmppBuffer(DataCodings.Default);
tmpBuff.AddBytes(data);
Add(TLV.Create(OptionalTags.MessagePayload, Convert.ToUInt16(tmpBuff.Length), tmpBuff.Buffer));
}