node.js modem reset

reset.js

/*
 Usage:
 You should allow telnet in modem settings beforehand (might be allowed already)
 You should set opts according to your modem settings
 
 loginText =        When you try `telnet 192.168.2.1` in terminal 
                    it asks you login name for the modem. Change 
                    this text to something you see on that line. 
                    I saw my modem name and used that.
                  
 routerDefaultIP =  might be different for different modems, 
                    192.168.1.1 is also common AFAIK
 
 username =         username for access to modem interface, 
                    'root' or 'admin' is common
 
 password =         password for access to modem interface
 
 commandDelimiter = you probably do not have to change this, 
                    either '#' or '>' should work
*/

var opts = {
  loginText: 'Air5750',
  routerDefaultIP: '192.168.2.1',
  username: 'root',
  password: 'thisisyourpass',
  commandDelimiter: '#'
};

var spawn = require('child_process').spawn,
    child = spawn('telnet', [opts.routerDefaultIP]);

child.stdout.on('data', function (data) {
  if(data.toString('utf8').indexOf(opts.loginText)>-1) {
    child.stdin.write(opts.username + '\n');
  } else if(data.toString('utf8').indexOf('Password')>-1) {
    child.stdin.write(opts.password + '\n');
  } else if(data.toString('utf8').indexOf(opts.commandDelimiter)>-1) {
    child.stdin.write('reboot\n');
  }
});