Frohser

You're adding an event listener named getTradeURL, not calling a method. community.getTradeURL(...

Use "sessionExpired" event from node-steamcommunity, then relogin using node-steam-user "webLogon()".
 
edit: this might help https://dev.doctormckay.com/topic/1134-not-able-to-respond-to-offers-because-not-online/?p=3786

That should work, but for robustness you should listen for the disconnected event then re-login after that gets emitted (but make sure you only call logOn in response to disconnected if you manually initiated the logoff; disconnected can also be emitted if Steam goes down, in which case it will automatically reconnect).

Sleeping won't work. You need to use setTimeout to delay asynchronously. Delaying synchronously breaks pretty much everything, always.