Nwton

Please read the documentation, specifically the options.

Sure I did. But now I see: client.setOption('promptSteamGuardCode', false);

Now 'steamGuard' event is works. 

I log in alike:

client.logOn({
    'accountName': login,
    'password': pass,
    'twoFactorCode': SteamTotp.getAuthCode(shared_secret)
});

It works. But sometimes, Totp generate a code too late, and I get require for another guard code directly in putty console.

How to retry log in automatically if code is not valid anymore?

Also, I don't get any events from 'steamGuard' or 'error'.

You can create an offer and use getUserDetails. If the token is bad, it will error.

It works, thanks!

So, we have: https...partner=12345&token=abcde

Here is no problem to check "partner" part of url. But how to test "token"? I wanna notice user about not valid link on link edit stage, far before offer sent.