Hostapd or wpad

What hostapd is?
Wpad alone is not enough?
When should I use hostapd ?
Can't find concrete information about this...

for what ?

might be outdated

Wpad is enough for Fast Roaming?

for 802.11r i've always uninstalled wpad, and updated hostapd-mini/-basic with plain hostapd.

802.11r is not working in my situation (wpad-wolfssl) .
Should I use hostapd to make it work?

try wpad-openssl instead of wpad-wolfssl

hostapd is a cut-down build of wpad which does not support client modes. The only reason to use hostapd instead of wpad is limited memory.

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It works though, at least for me.