Add a 2 minute session expiry on the mqtt connection

FlowFuse · May 2, 2024 · 08e2581 · 08e2581
1 parent 2b70c7a
commit 08e2581
Showing 1 changed file with 5 additions and 0 deletions.
diff --git 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: {