From c2d9ffa7ad7c101ec8c8626b040a8b2aaa12ee98 Mon Sep 17 00:00:00 2001
From: Koen Kanters <koenkanters94@gmail.com>
Date: Mon, 29 Nov 2021 17:49:44 +0100
Subject: [PATCH] Fix "Possible EventEmitter memory leak detected. 1001 drain
 listeners added to [Socket]" warning. #9822

---
 lib/mqtt.ts       | 1 +
 test/stub/mqtt.js | 1 +
 2 files changed, 2 insertions(+)

diff --git a/lib/mqtt.ts b/lib/mqtt.ts
index 8442348da5..a5bc7fd39f 100644
--- a/lib/mqtt.ts
+++ b/lib/mqtt.ts
@@ -69,6 +69,7 @@ export default class MQTT {
 
         return new Promise((resolve, reject) => {
             this.client = mqtt.connect(mqttSettings.server, options);
+            this.client.setMaxListeners(0);
 
             const onConnect = this.onConnect;
             this.client.on('connect', async () => {
diff --git a/test/stub/mqtt.js b/test/stub/mqtt.js
index 46ff57b54c..9c60a38142 100644
--- a/test/stub/mqtt.js
+++ b/test/stub/mqtt.js
@@ -6,6 +6,7 @@ const mock = {
     subscribe: jest.fn(),
     reconnecting: false,
     on: jest.fn(),
+    setMaxListeners: jest.fn(),
 };
 
 const mockConnect = jest.fn().mockReturnValue(mock);