如何通过nodejs中的TCP / IP获取传感器数据？ [英] How to get sensor data over TCP/IP in nodejs?
问题描述
我有一个使用socket.io的nodejs应用程序。要测试这个，请将以下列表保存为app.js.安装节点，然后npm安装socket.io，最后在命令提示符下运行：node app.js
$ b
I have a nodejs app with socket.io. To test this, save the below listing as app.js. Install node, then npm install socket.io and finally run on command prompt: node app.js
var http = require('http'),
fs = require('fs'),
// NEVER use a Sync function except at start-up!
index = fs.readFileSync(__dirname + '/index.html');
// Send index.html to all requests
var app = http.createServer(function(req, res) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.end(index);
});
// Socket.io server listens to our app
var io = require('socket.io').listen(app);
// Send current time to all connected clients
function sendTime() {
io.sockets.emit('time', { time: new Date().toJSON() });
}
// Send current time every 10 secs
setInterval(sendTime, 5000);
// Emit welcome message on connection
io.sockets.on('connection', function(socket) {
socket.emit('welcome', { message: 'Welcome!' });
socket.on('i am client', console.log);
});
app.listen(3000);
此代码将数据发送到文件index.html。 运行app.js后，在浏览器中打开此文件。
This code sends data to the file index.html. After running the app.js, open this file in your browser.
<!doctype html>
<html>
<head>
<script src='http://code.jquery.com/jquery-1.7.2.min.js'></script>
<script src='http://localhost:3000/socket.io/socket.io.js'></script>
<script>
var socket = io.connect('//localhost:3000');
socket.on('welcome', function(data) {
$('#messages').html(data.message);
socket.emit('i am client', {data: 'foo!'});
});
socket.on('time', function(data) {
console.log(data);
$('#messages').html(data.time);
});
socket.on('error', function() { console.error(arguments) });
socket.on('message', function() { console.log(arguments) });
</script>
</head>
<body>
<p id='messages'></p>
</body>
</html>
目前发送的数据是当前时间，index.html正常工作，每五秒。
The data sent right now is the current time and index.html works fine, updates the time every five seconds.
我想修改代码，以便通过TCP读取我的传感器数据。我的传感器通过数据采集系统连接，并通过IP传输传感器数据：172.16.103.32端口：7700。 （这是局域网，所以你不能访问。）
I want to modify the code so that, it reads my sensor data over TCP. My sensors are connected thru a data acquisition system and relays the sensor data over IP: 172.16.103.32 port:7700. (This is over LAN, so will not the accessible to you.)
如何在nodejs中实现？
SensorMonkey 是一种可行的替代方案吗？如果是这样，关于如何使用它的任何指针？
Is SensorMonkey a viable alternative ? If so, any pointers on how to go about using it?
推荐答案
我有一个正常的黑客，现在正在工作，因为我请求读者评论....
I have a decent hack that is working right now, for which I request the readers to comment on....
var net = require('net'),
http = require('http'),
port = 7700, // Datalogger port
host = '172.16.103.32', // Datalogger IP address
fs = require('fs'),
// NEVER use a Sync function except at start-up!
index = fs.readFileSync(__dirname + '/index.html');
// Send index.html to all requests
var app = http.createServer(function(req, res) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.end(index);
});
// Socket.io server listens to our app
var io = require('socket.io').listen(app);
// Emit welcome message on connection
io.sockets.on('connection', function(socket) {
socket.emit('welcome', { message: 'Welcome!' });
socket.on('i am client', console.log);
});
//Create a TCP socket to read data from datalogger
var socket = net.createConnection(port, host);
socket.on('error', function(error) {
console.log("Error Connecting");
});
socket.on('connect', function(connect) {
console.log('connection established');
socket.setEncoding('ascii');
});
socket.on('data', function(data) {
console.log('DATA ' + socket.remoteAddress + ': ' + data);
io.sockets.emit('livedata', { livedata: data }); //This is where data is being sent to html file
});
socket.on('end', function() {
console.log('socket closing...');
});
app.listen(3000);
参考文献：
References:
- Socket.io网站 - www.socket.io - 它现在是流行词。
- TCP Socket编程
- Nodejsnet module
- 最简单的socket.io示例。
- Socket.io Website - www.socket.io - Its the buzzword now.
- TCP Socket Programming
- Nodejs "net" module
- Simplest possible socket.io example.
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