add reset capability to rue node

function/rbe/package.json

@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-node-rbe",
-    "version"       : "0.1.13",
+    "version"       : "0.1.14",
     "description"   : "A Node-RED node that provides report-by-exception (RBE) and deadband capability.",
     "dependencies"  : {
     },

function/rbe/rbe.html

@@ -41,6 +41,9 @@
         <dt class="optional">topic <span class="property-type">string</span>
         </dt>
         <dd>if specified the function will work on a per topic basis.</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> 
     </dl>
     <h3>Outputs</h3>
     <dl class="message-properties">

function/rbe/rbe.js

@@ -18,6 +18,12 @@ module.exports = function(RED) {
 
         node.previous = {};
         this.on("input",function(msg) {
+            if (msg.hasOwnProperty("reset")) {
+                if (msg.hasOwnProperty("topic") && (typeof msg.topic === "string") && (msg.topic !== "")) {
+                     delete node.previous[msg.topic];
+                }
+                else { node.previous = {}; }
+            }
             if (msg.hasOwnProperty("payload")) {
                 var t = msg.topic || "_no_topic";
                 if ((this.func === "rbe") || (this.func === "rbei")) {