The SMPP PDU used by an ESME to submit an SMS for delivery to the SMSC.
Why submit_sm Matters
This is the core send operation in SMPP: every outbound message, whether an OTP, a promotional blast, or a single transactional alert, goes out as a submit_sm.
How submit_sm Works
The ESME sends a submit_sm PDU containing the source and destination address, the message body (or a reference to a pre-registered template, where DLT applies), and delivery options. The SMSC responds with a submit_sm_resp carrying a message ID, then later reports final status via a deliver_sm delivery receipt.
How SMPPCenter Uses This
Every message sent through SMPPCenter, whether via the panel, the REST API, or a direct SMPP bind, ultimately becomes a submit_sm on the wire between SMPPCenter and the upstream operator.
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