javascript - 将此 PHP RS232 代码移植到 Node.js

Question

我正在尝试将这个简单的 PHP 脚本移植到 node.js。电视使用RS232，命令为PON打开； POF 关闭。

此示例成功打开我的电视:

<?php
$rs232_sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
$result = socket_connect($rs232_sock, '10.0.1.155', '4999');
$rs232_in = pack("H*" ,'02'.bin2hex('PON').'03');
socket_write($rs232_sock, $rs232_in, strlen($rs232_in));
?>

我已经为 NodeJS 启动了这个:

var net = require('net');
var jspack = require('jspack/jspack.js').jspack;    

client.connect('4999','10.0.1.155', function(){
    console.log('CONNECTED');
        // Send the RS232 command
        client.write(jspack.Pack("H",'02'+bin2hex(command)+'03'));
}).on('data', function(data) {
    // log the response
    console.log('DATA: ' + data);
    // Close the connection
    client.destroy();
});

这导致:

net.js:618
    throw new TypeError('invalid data');
    ^

TypeError: invalid data
    at Socket.write (net.js:618:11)
    at Socket.<anonymous> (/Users/paul/Sites/homebridge-globalcache-gc100/test.js:79:10)
    at Socket.g (events.js:261:16)
    at emitNone (events.js:73:20)
    at Socket.emit (events.js:167:7)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1051:10)

Answer 1

您不需要额外的库来发送二进制数据。像这样的东西应该足够了:

var net = require('net');
var PON_MSG = new Buffer('\x02PON\x03', 'binary');
var POF_MSG = new Buffer('\x02POF\x03', 'binary');

client.connect('4999','10.0.1.155', function() {
  console.log('CONNECTED');
  // Replace `PON_MSG` with `POF_MSG` to do POF instead
  client.write(PON_MSG);
}).on('data', function(data) {
  console.log('DATA: %j', data);
});

另请注意，data 事件可以多次触发，因此何时可以安全地结束连接(如果远程端没有自动这样做)取决于协议(protocol)(以确保您已收到完整的回复)。