problem with executing channel sync() function

[abijahm]

var MikroNode = require('mikronode');

var device = new MikroNode('192.168.43.182');
device.setDebug(MikroNode.DEBUG);
device.connect('admin', 'admin').then(function (conn) {
    conn.closeOnDone(true); 
    let chan = conn.openChannel('1')
    //chan.sync(true);
    chan.sync(true)
    chan.write('/tool/user/user/add',{
        'customer':'admin',
        'username':'user',
        'password':'user'
    })
    chan.write('/tool/user/user/print')
});

will not complete it gets stuck creating channel 1

but without it it works

var MikroNode = require('mikronode');

var device = new MikroNode('192.168.43.182');
device.setDebug(MikroNode.DEBUG);
device.connect('admin', 'admin').then(function (conn) {
    conn.closeOnDone(true); 
    let chan = conn.openChannel('1')
    //chan.sync(true)
    chan.write('/tool/user/user/add',{
        'customer':'admin',
        'username':'user',
        'password':'user'
    })
    chan.write('/tool/user/user/print')
});

[Trakkasure]

Published version 2.1.0