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Let RBE node handle multiple msg.topic at the same time.

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dceejay 2015-06-29 17:29:12 +01:00
parent 04f43851e5
commit 3f08764dd4
4 changed files with 13 additions and 7 deletions
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3
function/rbe/README.md
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@ -18,6 +18,9 @@ Usage
A simple node to provide report by exception (RBE) and deadband function A simple node to provide report by exception (RBE) and deadband function
- only passes on data if it has changed. - only passes on data if it has changed.
This works on a per **msg.topic** basis. This means that a single rbe node can
handle multiple topics at the same time.
###RBE mode ###RBE mode
Outputs the **msg** if the **msg.payload** is different to the previous one. Outputs the **msg** if the **msg.payload** is different to the previous one.

2
function/rbe/package.json
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@ -1,6 +1,6 @@
{ {
"name" : "node-red-node-rbe", "name" : "node-red-node-rbe",
"version" : "0.0.4", "version" : "0.0.5",
"description" : "A Node-RED node that provides report-by-exception (RBE) and deadband capability.", "description" : "A Node-RED node that provides report-by-exception (RBE) and deadband capability.",
"dependencies" : { "dependencies" : {
}, },

2
function/rbe/rbe.html
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@ -38,6 +38,8 @@
different to the previous one. Works on numbers and strings.</p> different to the previous one. Works on numbers and strings.</p>
<p>In <b>deadband</b> mode the incoming payload should contain a parseable <i>number</i> and is <p>In <b>deadband</b> mode the incoming payload should contain a parseable <i>number</i> and is
output only if greater than + or - the <i>band gap</i> away from the previous output.</p> output only if greater than + or - the <i>band gap</i> away from the previous output.</p>
<p><b>Note:</b> This works on a per <b>msg.topic</b> basis. This means that a single rbe node can
handle multiple topics at the same time.</p>
</script> </script>
<script type="text/javascript"> <script type="text/javascript">

13
function/rbe/rbe.js
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@ -23,21 +23,22 @@ module.exports = function(RED) {
this.gap = n.gap || 0; this.gap = n.gap || 0;
var node = this; var node = this;
var previous = null; node.previous = {};
this.on("input",function(msg) { this.on("input",function(msg) {
if (msg.hasOwnProperty("payload")) { if (msg.hasOwnProperty("payload")) {
var t = msg.topic || "_no_topic";
if (this.func === "rbe") { if (this.func === "rbe") {
if (msg.payload != previous) { if (msg.payload != node.previous[t]) {
previous = msg.payload; node.previous[t] = msg.payload;
node.send(msg); node.send(msg);
} }
} }
else { else {
var n = parseFloat(msg.payload); var n = parseFloat(msg.payload);
if (!isNaN(n)) { if (!isNaN(n)) {
if (previous == null) { previous = n - node.gap; } if (!node.previous.hasOwnProperty(t)) { node.previous[t] = n - node.gap; }
if (Math.abs(n - previous) >= node.gap) { if (Math.abs(n - node.previous[t]) >= node.gap) {
previous = n; node.previous[t] = n;
node.send(msg); node.send(msg);
} }
} }