我有一些用于串行通信的nodejs示例。一个例子是使用serialport模块(如下)。我有一个配对的蓝牙设备,设置为rfcomm0。我可以通过命令行与echo data > /dev/rfcomm0
进行通信并收到响应,因此它似乎有效。问题是它不能通过nodejs工作。当我执行nodejs SerialToJson.js /dev/rfcomm0
时,下面的示例会抛出“无法加载绑定文件”错误。另一种方法是使用蓝牙串口模块,但也不能通过npm安装,因为找不到我正在使用的节点版本的兼容版本。我知道如何解决每个问题,但我不知道要追求哪个,串口模块可以与rfcomm(串口仿真)一起使用,还是蓝牙串口模块更适合?
/*
SerialToJson.js
a node.js app to read serial strings, convert them to
JSON objects, and send them to webSocket clients
requires:
* node.js (http://nodejs.org/)
* express.js (http://expressjs.com/)
* socket.io (http://socket.io/#how-to-use)
* serialport.js (https://github.com/voodootikigod/node-serialport)
To call it type:
node SerialToJSON.js portname
where portname is the path to the serial port you want to open.
created 1 Nov 2012
modified 7 Nov 2012
by Tom Igoe
*/
var serialport = require("serialport"), // include the serialport library
SerialPort = serialport.SerialPort, // make a local instance of serial
app = require('express')(), // start Express framework
server = require('http').createServer(app), // start an HTTP server
io = require('socket.io').listen(server); // filter the server using socket.io
var portName = process.argv[2]; // third word of the command line should be serial port name
console.log("opening serial port: " + portName); // print out the port you're listening on
server.listen(8080); // listen for incoming requests on the server
console.log("Listening for new clients on port 8080");
var connected = false;
// open the serial port. Change the name to the name of your port, just like in Processing and Arduino:
var myPort = new SerialPort(portName, {
// look for return and newline at the end of each data packet:
parser: serialport.parsers.readline("\r\n")
});
// respond to web GET requests with the index.html page:
app.get('/', function (request, response) {
response.sendfile(__dirname + '/index.html');
});
// listen for new socket.io connections:
io.sockets.on('connection', function (socket) {
// if the client connects:
if (!connected) {
// clear out any old data from the serial bufffer:
myPort.flush();
// send a byte to the serial port to ask for data:
myPort.write('c');
console.log('user connected');
connected = true;
}
// if the client disconnects:
socket.on('disconnect', function () {
myPort.write('x');
console.log('user disconnected');
connected = false;
});
// listen for new serial data:
myPort.on('data', function (data) {
// Convert the string into a JSON object:
var serialData = JSON.parse(data);
// for debugging, you should see this in the terminal window:
console.log(data);
// send a serial event to the web client with the data:
socket.emit('serialEvent', serialData);
});
});
答案 0 :(得分:5)
很高兴知道它正在运作。 Serialport模块也适用于我。
使用模块serialport,您需要另一个模块与蓝牙设备连接,或者您需要手动连接终端中的rfcomm。 功能上的巨大差异是bluetooth-serial-port不需要您与rfcomm连接。该模块可以扫描蓝牙设备并与之连接。连接后,它具有与serialport相同的功能。
因此,如果您的应用程序/模块只需要连接蓝牙设备并且您想要扫描功能,那么至少尝试使用蓝牙串口是值得的。
npm模块/自述文件中有一些示例,因此测试它不会花费太多时间。
编辑:
发布了新版本,非常稳定! :d https://npmjs.org/package/bluetooth-serial-port