var net = require('net');

// 指定连接的tcp server ip，端口
var options = {
    host : '127.0.0.1',  
    port : 5678
}

var tcp_client = net.Socket();

// 连接 tcp server
tcp_client.connect(options,function(){
    console.log('connected to Server');

    var buf = Buffer.from('01050002FF002DFA','hex')

    tcp_client.write(buf);
})

var count = 0
// 接收数据
tcp_client.on('data',function(data){
    //tcp_client.write(count.toString())
    //count++
    console.log('received data: %s from server', data.toString());
})

tcp_client.on('end',function(){
    console.log('data end!');
})

tcp_client.on('error', function () {
    console.log('tcp_client error!');
})