Fully implement delivery reports

src/MessageIdManager.ts

@@ -0,0 +1,17 @@
+import {PDU} from "./CommonObjects";
+
+export default class MessageIdManager {
+	private static messages: {[key: string]: number} = {};
+
+	static addMessageId(message: PDU, id: number): void {
+		this.messages[this.getMessageHash(message)] = id;
+	}
+
+	static getMessageId(message: PDU): number | undefined {
+		return this.messages[this.getMessageHash(message)];
+	}
+
+	private static getMessageHash(message: PDU): string {
+		return btoa(`${message.source_addr}:${message.destination_addr}:${message.short_message}`);
+	}
+}