Add an option to not unsubscribe topics on disconnect

packages/node_modules/@node-red/nodes/core/network/10-mqtt.html

@@ -249,6 +249,12 @@
                             <span id="node-config-input-cleansession-label" data-i18n="mqtt.label.cleansession"></span>
                         </label>
                     </div>
+                    <div class="form-row mqtt-persistence">
+                        <label for="node-config-input-unsubscribeOnDisconnect" style="width: auto;">
+                            <input type="checkbox" id="node-config-input-unsubscribeOnDisconnect" style="position: relative;vertical-align: bottom; top: -2px; width: 15px;height: 15px;">
+                            <span id="node-config-input-unsubscribeOnDisconnect-label" data-i18n="mqtt.label.unsubscribeOnDisconnect"></span>
+                        </label>
+                    </div>
                     <div class="form-row mqtt5">
                         <label style="width:auto" for="node-config-input-sessionExpiry"><span data-i18n="mqtt.label.sessionExpiry"></span></label>
                         <input type="number" min="0" id="node-config-input-sessionExpiry" style="width: 100px" >
@@ -505,6 +511,7 @@
                 label: RED._("node-red:mqtt.label.keepalive"),
                 validate:RED.validators.number(false)},
             cleansession: {value: true},
+            unsubscribeOnDisconnect: {value: true},
             birthTopic: {value:"", validate:validateMQTTPublishTopic},
             birthQos: {value:"0"},
             birthRetain: {value:"false"},
@@ -620,6 +627,10 @@
                 this.cleansession = true;
                 $("#node-config-input-cleansession").prop("checked",true);
             }
+            if (typeof this.unsubscribeOnDisconnect === 'undefined') {
+                this.unsubscribeOnDisconnect = true;
+                $("#node-config-input-unsubscribeOnDisconnect").prop("checked",true);
+            }
             if (typeof this.usetls === 'undefined') {
                 this.usetls = false;
                 $("#node-config-input-usetls").prop("checked",false);
@@ -635,6 +646,14 @@
             if (typeof this.protocolVersion === 'undefined') {
                 this.protocolVersion = 4;
             }
+            $("#node-config-input-cleansession").on("change", function() {
+                var useCleanSession = $("#node-config-input-cleansession").is(':checked');
+                if(useCleanSession) {
+                    $("div.form-row.mqtt-persistence").hide();
+                } else {
+                    $("div.form-row.mqtt-persistence").show();
+                }
+            });
             $("#node-config-input-protocolVersion").on("change", function() {
                 var v5 = $("#node-config-input-protocolVersion").val() == "5";
                 if(v5) {

packages/node_modules/@node-red/nodes/core/network/10-mqtt.js

@@ -482,6 +482,7 @@ module.exports = function(RED) {
             setIfHasProperty(opts, node, "protocolVersion", init);
             setIfHasProperty(opts, node, "keepalive", init);
             setIfHasProperty(opts, node, "cleansession", init);
+            setIfHasProperty(opts, node, "unsubscribeOnDisconnect", init);
             setIfHasProperty(opts, node, "topicAliasMaximum", init);
             setIfHasProperty(opts, node, "maximumPacketSize", init);
             setIfHasProperty(opts, node, "receiveMaximum", init);
@@ -590,6 +591,9 @@ module.exports = function(RED) {
             if (typeof node.cleansession === 'undefined') {
                 node.cleansession = true;
             }
+            if (typeof node.unsubscribeOnDisconnect === 'undefined') {
+                node.unsubscribeOnDisconnect = true;
+            }
 
             //use url or build a url from usetls://broker:port
             if (node.url && node.brokerurl !== node.url) {
@@ -660,6 +664,7 @@ module.exports = function(RED) {
             node.options.password = node.password;
             node.options.keepalive = node.keepalive;
             node.options.clean = node.cleansession;
+            node.options.unsubscribeOnDisconnect = node.unsubscribeOnDisconnect;
             node.options.clientId = node.clientid || 'nodered_' + RED.util.generateId();
             node.options.reconnectPeriod = RED.settings.mqttReconnectTime||5000;
             delete node.options.protocolId; //V4+ default
@@ -1228,12 +1233,16 @@ module.exports = function(RED) {
             node.on('close', function(removed, done) {
                 if (node.brokerConn) {
                     if(node.isDynamic) {
+                        if (node.brokerConn.options.unsubscribeOnDisconnect) {
                             Object.keys(node.dynamicSubs).forEach(function (topic) {
                                 node.brokerConn.unsubscribe(topic, node.id, removed);
                             });
                             node.dynamicSubs = {};
+                        }
                     } else {
-                        node.brokerConn.unsubscribe(node.topic,node.id, removed);
+                        if (node.brokerConn.options.unsubscribeOnDisconnect) {
+                            node.brokerConn.unsubscribe(node.topic, node.id, removed);
+                        }
                     }
                     node.brokerConn.deregister(node, done, removed);
                     node.brokerConn = null;

packages/node_modules/@node-red/nodes/locales/de/messages.json

@@ -362,6 +362,7 @@
             "port": "Port",
             "keepalive": "Keep-Alive",
             "cleansession": "Bereinigte Sitzung (clean session) verwenden",
+            "unsubscribeOnDisconnect": "Abonnement bei Verbindungsende automatisch beenden",
             "cleanstart": "Verwende bereinigten Start",
             "use-tls": "TLS",
             "tls-config": "TLS-Konfiguration",

packages/node_modules/@node-red/nodes/locales/en-US/messages.json

@@ -414,6 +414,7 @@
             "port": "Port",
             "keepalive": "Keep Alive",
             "cleansession": "Use clean session",
+            "unsubscribeOnDisconnect": "Automatically unsubscribe when disconnecting",
             "cleanstart": "Use clean start",
             "use-tls": "Use TLS",
             "tls-config": "TLS Configuration",