The transmitter connection is used for MT, and the receiver connection is used for MO and SR. In the separated Transmitter+receiver mode, the connection used depends on the kind of message transmitted. RESP PDU may arrive in any order, unrelated to the order of their corresponding initiator PDU. Requests may be pipelined: the sender can send many commands without waiting for RESP, the number of requests that may be pipelined at any time is called the window. A PDU contains a command, a status, a sequence number and data.Įach PDU must be acknowledged by an SMPP RESP PDU (synchronous response). SMPP transmission units (“packets”) are called PDUs. This limitation is due to its technical architecture.
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