Let RBE node be able to use any property as key (not just topic)

(not for publish until 2.0)

function/rbe/locales/en-US/rbe.html

@@ -10,7 +10,7 @@
             Other modes must provide a parseable number.</dd>
         <dt class="optional">topic <span class="property-type">string</span>
         </dt>
-        <dd>if specified the function will work on a per topic basis.</dd>
+        <dd>if specified the function will work on a per topic basis. This property can be set by configuration.</dd>
         <dt class="optional">reset<span class="property-type">any</span></dt>
         <dd>if set clears the stored value for the specified msg.topic, or
             all topics if msg.topic is not specified.</dd>
@@ -26,7 +26,7 @@
     <p>In RBE mode this node will block until the <code>msg.payload</code>,
        (or selected property) value is different to the previous one.
        If required it can ignore the intial value, so as not to send anything at start.</p>
-    <p>The <a href="https://en.wikipedia.org/wiki/Deadband" target="_blank">Deadband</a> modes will block the incoming value 
+    <p>The <a href="https://en.wikipedia.org/wiki/Deadband" target="_blank">Deadband</a> modes will block the incoming value
        <i>unless</i> its change is greater or greater-equal than &plusmn; the band gap away from a previous value.</p>
     <p>The Narrowband modes will block the incoming value,
        <i>if</i> its change is greater or greater-equal than &plusmn; the band gap away from the previous value.
@@ -36,6 +36,6 @@
     <p>Both Deadband and Narrowband allow comparison against either the previous valid output value, thus
     ignoring any values out of range, or the previous input value, which resets the set point, thus allowing
     gradual drift (deadband), or a step change (narrowband).</p>
-    <p><b>Note:</b> This works on a per <code>msg.topic</code> basis.
+    <p><b>Note:</b> This works on a per <code>msg.topic</code> basis, though this can be changed to another property if desired.
        This means that a single rbe node can handle multiple different topics at the same time.</p>
 </script>

function/rbe/locales/en-US/rbe.json

@@ -6,7 +6,7 @@
             "init": "Send initial value",
             "start": "Start value",
             "name": "Name",
-            "septopics": "Apply mode for each msg.topic separately"
+            "septopics": "Apply mode separately for each "
         },
         "placeholder":{
             "bandgap": "e.g. 10 or 5%",

function/rbe/package.json

@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-node-rbe",
-    "version"       : "0.5.0",
+    "version"       : "0.6.0",
     "description"   : "A Node-RED node that provides report-by-exception (RBE) and deadband capabilities.",
     "dependencies"  : {
     },

function/rbe/rbe.html

@@ -30,7 +30,7 @@
     <div class="form-row">
         <label> </label>
         <input type="checkbox" id="node-input-septopics" style="display:inline-block; width:20px; vertical-align:baseline;">
-        <span data-i18n="rbe.label.septopics"></span>
+        <span data-i18n="rbe.label.septopics"></span> <input type="text" id="node-input-topi" style="width:27%;"/>
     </div>
     <div class="form-row">
         <label for="node-input-name"><i class="fa fa-tag"></i> <span data-i18n="rbe.label.name"></span></label>
@@ -49,7 +49,8 @@
             start: {value:""},
             inout: {value:"out"},
             septopics: {value:true},
-            property: {value:"payload",required:true}
+            property: {value:"payload",required:true},
+            topi: {value:"topic",required:true}
         },
         inputs:1,
         outputs:1,
@@ -69,6 +70,7 @@
                 $("#node-input-septopics").prop('checked', true);
             }
             $("#node-input-property").typedInput({default:'msg',types:['msg']});
+            $("#node-input-topi").typedInput({default:'msg',types:['msg']});
             //$( "#node-input-gap" ).spinner({min:0});
             if ($("#node-input-inout").val() === null) {
                 $("#node-input-inout").val("out");

function/rbe/rbe.js

@@ -13,7 +13,8 @@ module.exports = function(RED) {
             this.gap = parseFloat(this.gap);
         }
         this.g = this.gap;
-        this.property = n.property||"payload";
+        this.property = n.property || "payload";
+        this.topi = n.topi || "topic";
         this.septopics = true;
         if (n.septopics !== undefined && n.septopics === false) {
             this.septopics = false;
@@ -23,8 +24,13 @@ module.exports = function(RED) {
 
         node.previous = {};
         this.on("input",function(msg) {
+            var topic;
+            try {
+                topic = RED.util.getMessageProperty(msg,node.topi);
+            }
+            catch(e) { }
             if (msg.hasOwnProperty("reset")) {
-                if (node.septopics && msg.hasOwnProperty("topic") && (typeof msg.topic === "string") && (msg.topic !== "")) {
+                if (node.septopics && topic && (typeof topic === "string") && (topic !== "")) {
                     delete node.previous[msg.topic];
                 }
                 else { node.previous = {}; }
@@ -32,7 +38,7 @@ module.exports = function(RED) {
             var value = RED.util.getMessageProperty(msg,node.property);
             if (value !== undefined) {
                 var t = "_no_topic";
-                if (node.septopics) { t = msg.topic || t; }
+                if (node.septopics) { t = topic || t; }
                 if ((this.func === "rbe") || (this.func === "rbei")) {
                     var doSend = (this.func !== "rbei") || (node.previous.hasOwnProperty(t)) || false;
                     if (typeof(value) === "object") {