seamless roaming not possible in a professional way with mikrotik. capsman wont help. go with professional aps, such as aruba, or cisco.
@empy, perhaps that's somewhat true for dense/complex enterprise setup...but we're talking about a dude's basement at a house, and that is after setting his main Mikrotik all up with VLAN etc to FTTH.
Anyway... Mikrotik to extend Wi-Fi be perfect, I think.
If you only need Wi-Fi, one of the cAP model may be better/cheaper. In any case, you can use any QuickSet mode that has the radio buttons to select "Bridged" (not "Routed" - no need for 2 DHCP etc. on the network), then pick the same SSID/password you used on the other one, and as @andriys says "just pick another channel". You'd do need an ethernet cable between them too
![Wink ;)](./images/smilies/icon_wink.gif)
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You could use CAPsMAN, that give you a "central place" to control the channel selection, password, SSID names, etc (e.g. from your first MIkrotik) - but I won't mess with it here – it's just a handful of settings need on the 2nd AP your talking about to make this all work, and your Wi-Fi will be dramatic improved I'd image from 2nd AP. Basement are typically a lot of cement, which is one of the worse material for Wi-Fi penetration, and likely why you need a 2nd AP.
Just to add to this...
Roaming is always a function of client. AP may assist, but it always up to the client to do the switchover.
Correct. Essentially, the Wi-Fi device, reads the dB level of all APs it can find, and selects the best one. Apple explain it's logic for doing this if you want a more full explanation:
https://support.apple.com/en-us/HT206207 – and the scheme Apple use is largely the same as Android or any Wi-Fi device, with the "trigger point" etc varying of course.