✨ handle resend errors

src/sender.ts

@@ -1,4 +1,5 @@
 import { Socket, createSocket } from 'dgram';
+import { EventEmitter } from 'events';
 import { multicastGroup } from './util';
 import { Packet, Options } from './packet';
 
@@ -49,7 +50,7 @@ export namespace Sender {
   }
 }
 
-export class Sender {
+export class Sender extends EventEmitter {
   private socket: Socket;
 
   private readonly port: Sender.Props['port'];
@@ -66,6 +67,8 @@ export class Sender {
 
   private sequence = 0;
 
+  private resendStatus = false;
+
   #loopId: NodeJS.Timeout | undefined;
 
   /**
@@ -84,6 +87,7 @@ export class Sender {
     iface,
     useUnicastDestination,
   }: Sender.Props) {
+    super();
     this.port = port;
     this.universe = universe;
     this.#destinationIp = useUnicastDestination || multicastGroup(universe);
@@ -123,7 +127,23 @@ export class Sender {
   }
 
   private reSend() {
-    if (this.#latestPacketOptions) this.send(this.#latestPacketOptions);
+    if (this.#latestPacketOptions) {
+      this.send(this.#latestPacketOptions)
+        .then(() => {
+          this.updateResendStatus(true);
+        })
+        .catch((err) => {
+          this.updateResendStatus(false);
+          this.emit('error', err);
+        });
+    }
+  }
+
+  private updateResendStatus(success: boolean) {
+    if (success !== this.resendStatus) {
+      this.resendStatus = success;
+      this.emit('changedResendStatus', success);
+    }
   }
 
   public close(): this {