Bind and Unbind

Establishing a session is the first step in any SMPP communication, and bind operations define how that session behaves. Whether the application intends to send messages or receive them it must initiate a bind request to the SMSC. Once bound, the session enters an active state, allowing for message exchange.
Unbinding is just as important - it signals a clean and intentional termination of the session, ensuring resources are released properly on both ends.
This section outlines the classes that represent these fundamental session operations. Each class encapsulates the structure and behavior of its respective SMPP PDU.