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Single MQTT subscribe pushing to all clients
1 parent 8c56b01 commit 5031a28

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4 files changed

+47
-31
lines changed

4 files changed

+47
-31
lines changed

‎mqtt/app.js‎

Lines changed: 29 additions & 26 deletions
Original file line numberDiff line numberDiff line change
@@ -22,33 +22,36 @@ function handler (req, res) {
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}
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// for each client connection, subscribe to mqtt and push updates
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io.sockets.on('connection', function (socket) {
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var mqtt = require('mqtt');
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var client = mqtt.createClient(1883, 'localhost', function(err, client) {
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keepalive: 1000
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});
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// set of per client local variables
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var powercumulative = 0;
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var powerlasttime = new Date().getTime(); // UNIX time in ms
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client.on('connect', function() {
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client.subscribe('sensors/+/+');
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client.on('message', function(topic, message) {
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// console.log('topic: ' + topic + ' payload: ' + message);
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socket.emit('data', { topic: topic, value: message });
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if (topic == "sensors/power/0") {
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var powercurrenttime = new Date().getTime();
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var duration = (powercurrenttime - powerlasttime) / 1000.0;
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var powerused = parseInt(message, 10) * (duration / 3600.0);
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powercumulative += powerused;
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// console.log("duration ", duration, "powerused ", powerused, "cumulative ", powercumulative);
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socket.emit('data', { topic: "powercumulative", value: powercumulative.toFixed(3) });
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powerlasttime = powercurrenttime;
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}
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});
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});
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});
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// subscribe to MQTT
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var mqtt = require('mqtt');
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var client = mqtt.createClient(1883, 'localhost', function(err, client) {
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keepalive: 1000
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});
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// global variables for tracking cumulative power usage
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var powercumulative = 0;
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var powerlasttime = new Date().getTime(); // UNIX time in ms
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client.on('connect', function() {
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client.subscribe('sensors/+/+');
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client.on('message', function(topic, message) {
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// console.log('topic: ' + topic + ' payload: ' + message);
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io.sockets.emit('data', { topic: topic, value: message });
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if (topic == "sensors/power/0") {
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var powercurrenttime = new Date().getTime();
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var duration = (powercurrenttime - powerlasttime) / 1000.0;
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var powerused = parseInt(message, 10) * (duration / 3600.0) / 1000.0; // convert to KWh
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powercumulative += powerused;
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console.log("duration ", duration, "powerused ", powerused, "cumulative ", powercumulative);
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io.sockets.emit('data', { topic: "powercumulative", value: powercumulative.toFixed(3) });
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powerlasttime = powercurrenttime;
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}
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});
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});
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‎mqtt/index.html‎

Lines changed: 3 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -47,7 +47,7 @@
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var topictag = "sensors/power/";
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if (data.topic.substring(0,topictag.length) == topictag) {
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console.log("Power match - " + data.topic + " " + typeof(data.topic));
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// console.log("Power match - " + data.topic + " " + typeof(data.topic));
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// check if the table cells exists, if not create it and then set value
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if (!ElementExists ("myTablePowerPower" + data.topic)) {
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var table=document.getElementById("myTablePower");
@@ -69,14 +69,14 @@
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var topictag = "powercumulative";
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if (data.topic.substring(0,topictag.length) == topictag) {
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console.log("Powercumulative - " + data.value);
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// console.log("Powercumulative - " + data.value);
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document.getElementById("powercumulative").innerHTML= data.value;
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}
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var topictag = "sensors/temperature/";
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if (data.topic.substring(0,topictag.length) == topictag) {
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console.log("Temperature match - " + data.topic + " " + typeof(data.topic));
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// console.log("Temperature match - " + data.topic + " " + typeof(data.topic));
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// check if the table cells exists, if not create it and then set value
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if (!ElementExists ("myTableTempTemp" + data.topic)) {
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var table=document.getElementById("myTableTemp");
@@ -93,8 +93,6 @@
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// print the time the refresh happened
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var dt = new Date();
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document.getElementById("time").innerHTML= dt.toLocaleTimeString();

‎mqtt/package.json‎

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,12 @@
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{
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"name": "hello-world",
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"description": "hello world test app",
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"version": "0.0.1",
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"private": true,
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"dependencies": {
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"express": "3.x",
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"socket.io": "*",
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"smoothie": "*",
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"mqtt": "*"
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}
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}

‎mqtt/run.sh‎

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,3 @@
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#!/bin/sh
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cd /home/download/mqtt
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nodemon app.js

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