1. Check that your tablet and the server are in the same WiFi net.
2. Check that Gate for Homekit module is added to the project.
3. Check that after setting the project you pressed "Make public" button. Only after it the project is uploaded to the server and launched.
4. Sometimes the Home app on iOS devices can't find an accessory until a new object is created. Delete the previous Home by entering Settings (an icon that looks like a plane in the left corner) and selecting "Delete" and create a new one.
5. Check that work with UDP traffic is turned on at your router.