From 5663cbf581ab236671a6334f4d1800ceb53ee35a Mon Sep 17 00:00:00 2001
From: everhardt <rob@everhardt.nl>
Date: Tue, 12 Dec 2023 16:56:22 +0100
Subject: [PATCH] fix: avoid uncaughtException when server cannot open (#537)

---
 ServerTCP.d.ts       | 1 +
 servers/servertcp.js | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/ServerTCP.d.ts b/ServerTCP.d.ts
index 35762e2..64b411c 100644
--- a/ServerTCP.d.ts
+++ b/ServerTCP.d.ts
@@ -53,6 +53,7 @@ interface IServerOptions {
 
 export declare interface ServerTCP {
     on(event: 'socketError', listener: FCallback): this;
+    on(event: 'serverError', listener: FCallback): this;
     on(event: 'error', listener: FCallback): this;
     on(event: 'initialized', listener: FCallback): this;
 }
diff --git a/servers/servertcp.js b/servers/servertcp.js
index 09af1c5..dbd971a 100644
--- a/servers/servertcp.js
+++ b/servers/servertcp.js
@@ -217,6 +217,9 @@ class ServerTCP extends EventEmitter {
 
         // create a tcp server
         modbus._server = net.createServer();
+        modbus._server.on("error", function(error) {
+            modbus.emit("serverError", error);
+        });
         modbus._server.listen({
             port: options.port || MODBUS_PORT,
             host: options.host || HOST