Need help for this scenario (wireless roaming)

I have an office which consist of 4 floors and i want to setup wireless in such a way that the client will not disconnect even if it will roam from ground floor to till last floor (If i am not wrong, this concept is called wireless roaming?)

What kind of hardware i need, please mikrotik tested hardware only? and please also explain me the configuration.

thanks in advance!

Mikrotik don’t support roaming. Do you really need that?

What are you going to use the wireless network for?

This has been covered many times. It all depends on your requirements

If you can wire each ap to a central switch, simply set the ssid the same on all devices, but change the channels so that neighboring aps are at least 5 channels apart. Your device will switch aps as you move around the building. Its not seamless, but takes less than a second.

If you need to use wireless wds links, it wont perform well at all as the device will not switchwhen you think itshould.

And what to do with wireless and Ethernet on AP? Bridge them?
Behind switch I need to put some MT which will do DHCP, DNS, QoS, Hotspot etc.?
Thx