From 08e25819ca3f4bd51a6fc9f67527b2fe717b918a Mon Sep 17 00:00:00 2001
From: Nick O'Leary <nick.oleary@gmail.com>
Date: Thu, 2 May 2024 15:58:42 +0100
Subject: [PATCH] Add a 2 minute session expiry on the mqtt connection

---
 nodes/project-link.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/nodes/project-link.js b/nodes/project-link.js
index 0436fd7..ab3fa2f 100644
--- a/nodes/project-link.js
+++ b/nodes/project-link.js
@@ -526,8 +526,13 @@ module.exports = function (RED) {
                     /** @type {MQTT.IClientOptions} */
                     const defaultOptions = {
                         protocolVersion: 5,
+                        clean: false,
                         reconnectPeriod: RED.settings.mqttReconnectTime || 5000,
                         properties: {
+                            // Allow the broker to keep the session alive for 2 minutes after
+                            // a disconnect. This ensures short-connectivity blips do not lead to
+                            // inbound message loss.
+                            sessionExpiryInterval: 120,
                             requestResponseInformation: true,
                             requestProblemInformation: true,
                             userProperties: {