I have purchased four Mikrotik 15s devices. I want to configure one device as the controller and the other three as clients. All four devices should provide Wi-Fi access to laptops and mobile phones. In my network, only the Cisco core switch provides DHCP to all devices. I want the Mikrotik devices to obtain their IP addresses from the core switch and allow Wi-Fi clients connected to them to receive IP addresses from the same DHCP source.
Welcome, you can have a look at CAPsMAN as "controller":
Often it is run on a router, but you can run it on a 15s as well.