fix

src/Server.ts

@@ -10,15 +10,16 @@ export class Server {
   ack = 0;
 
   onMessage(socket: Socket, message: Change, self: Hello) {
-    if (message.seq && this.ack !== message.seq) {
-      console.log('seq mismatch rejected');
-      return;
-    }
-
     if (message.seq === 0) {
+      this.ack = 0;
       RouteWriter.reset();
     }
 
+    if (this.ack !== message.seq) {
+      console.log('seq mismatch rejected');
+      return;
+    }
+
     for (const [to, via] of Object.entries(message.via)) {
       RouteWriter.setVia(parseInt(to), via);
     }
@@ -26,7 +27,7 @@ export class Server {
     //   RouteWriter.setVia(parseInt(plan), to);
     // }
     RouteWriter.commit();
-    this.ack = message.seq + 1;
+    this.ack++;
 
     const response: Report = {
       id: self.id,