How to trigger an external visitor my website?

I am using an app machine, in the free license the app will sleep in one hour if there are no users (than it will take 1 minute to wake up, stupid rule anyway). So I want to solve this by developing an internal/external scheduled task.

I tried to schedule an event for each 58 minuts and update the statistics but it didnt work. The app machine sees there are not external users apparently.

So...How can I solve this? Would an external web service for login work?

Hope to hear frm you thnx