Working commit

src/PDUProcessor/Postprocessor/Center/EchoPduProcessor.ts

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+import {Center} from "../../../Center/Center";
+import {PDU} from "../../../CommonObjects";
+import Postprocessor from "../Postprocessor";
+
+const smpp = require("smpp");
+
+export class EchoPduProcessor extends Postprocessor {
+	serverSessionType: string = Center.name;
+
+	processPdu(session: any, pdu: PDU, ...args: any[]): Promise<any> {
+		return new Promise<any>((resolve, reject) => {
+			let promises = [];
+			if (pdu.response) {
+				let replyPromise = session.send(pdu.response());
+				let sendPromise = session.send(new smpp.PDU('deliver_sm', {
+					source_addr: pdu.destination_addr,
+					destination_addr: pdu.source_addr,
+					short_message: pdu.short_message
+				}));
+				promises.push(replyPromise);
+				promises.push(sendPromise);
+			}
+			Promise.all(promises).then((replyPdus: any) => {
+				resolve(replyPdus);
+			}).catch((error: any) => {
+				reject(error);
+			});
+		});
+	}
+}