SMPP Protocol Helpers and Utilities

This section contains internal helper classes that support the encoding, decoding, parsing, and construction of SMPP protocol messages. These components provide the low-level mechanisms necessary to correctly handle binary data formats, optional parameters, and partial or malformed PDUs.

PduTranscoder is responsible for serializing and deserializing SMPP PDUs (Protocol Data Units) from and to their binary form. It ensures that messages conform to the wire format expected by the protocol and abstracts the complexities of buffer management.

Tlv represents individual Tag-Length-Value parameters commonly used as optional fields in SMPP. This utility provides an object-oriented way to read, write, and manipulate TLVs, which are essential for extending SMPP commands beyond their base structure.

SmppHelper includes general-purpose utilities for handling SMPP message contents, including delivery report generation, message encoding interpretation, and UDH (User Data Header) parsing. It simplifies interaction with common protocol behaviors and provides reusable logic used across message processing flows.

ByteBufUtil offers utilities for working with Netty's ByteBuf objects, including string encoding/decoding, address handling, and TLV read/write support. This class ensures efficient and consistent binary operations when dealing with low-level protocol data.

PartialPdu and PartialPduResp are specialized classes for managing incomplete or placeholder PDUs. These are typically used in error handling scenarios, such as when only part of a message is available or a generic negative acknowledgment (GenericNack) is being generated.