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copied!<p>Your question cannot be answered the way it is presented now. I explained two possible setups below and then solutions you are seeking. My answers are based on <a href="http://www.nowsms.com/discus/messages/1/SMPP_v3_4_Issue1_2-24857.pdf" rel="noreferrer">SMPP 3.4 spec</a>.</p> <p><strong>Setup</strong></p> <p>Setup-1: You are creating a SMPP client</p> <ol> <li>You are creating a SMPP client. Clients usually initiate connections. Clients are also known as ESME (External Short Message Entity).</li> <li>Your client will connect to a SMSC. SMSC are servers and they usually wait for connections.</li> <li>An ESME can send messages via "submit_sm" or "data_sm" PDU.</li> </ol> <p>Setup-2: You are creating a SMSC</p> <ol> <li>A SMSC can send messages via "deliver_sm" or "data_sm" PDU.</li> </ol> <p><strong>Initiating connection</strong></p> <p>Usually ESME will send a bind request to SMSC. A bind request can be send via one of "bind_transmitter", "bind_receiver" or "bind_transceiver" PDU.</p> <p>The SMSC can be eager and invite an ESME to send bind request via "outbind" PDU. In this case, the SMSC has to know the IP/port of the ESME. It is rarely used.</p> <p>Here a snippet of sending outbind request</p> <pre><code>//you will need these classes import org.smpp.Session; import org.smpp.pdu.Outbind; Session session = .... ;//Assuming you created a session instance Outbind outbind = new Outbind(...);//assuming you created a outbind instance session.outbind(outbind);//send outbind </code></pre> <p><strong>Sending messages</strong></p> <p>I already discussed this in the setup part. Repeating here,</p> <ol> <li>An ESME can send messages via "submit_sm" or "data_sm" PDU. data_sm is not frequently used.</li> <li>A SMSC can send messages via "deliver_sm" or "data_sm" PDU. data_sm is not frequently used.</li> </ol> <p>I am not sure why sending only "deliver_sm" is so important. As coder, you have control over the kind of PDU you are going to send.</p> <p>Here a snippet of sending deliver_sm request</p> <pre><code>//you will need these classes import org.smpp.Session; import org.smpp.pdu.DeliverSM; DeliverSM pdu = new DeliverSM(); pdu.setSequenceNumber(1);//set unique numbers pdu.setSourceAddr(new Address(1, 1, "12120001234"));//TON, NPI, source number pdu.setDestAddr(new Address(1, 1, "12120004321"));//TON, NPI, destination number pdu.setShortMessage("Hello world"); session.deliver(pdu); </code></pre>

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