Protocol Data Unit, the individual binary message exchanged over an SMPP session, such as submit_sm to send a message or deliver_sm to receive one.
Why PDU Matters
SMPP is a binary protocol, not a text-based one like HTTP/JSON. Every action, from binding, to submitting a message, to a keep-alive, is a distinct PDU type with a fixed and optional-field structure, which is what lets it move so many messages per second with so little overhead.
How PDU Works
Each PDU has a header (command ID, sequence number, status) and a body carrying the fields relevant to that command. submit_sm carries the message and destination; deliver_sm carries an inbound message or delivery receipt; enquire_link carries nothing but keeps the TCP session alive.
How SMPPCenter Uses This
SMPPCenter's SMPP client and server construct and parse these PDUs on your behalf. If you integrate directly over SMPP rather than through the REST API, your ESME will be exchanging these same PDU types with SMPPCenter's server.
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