How to set up seamless roaming on Rasberry pi + wifi dongle?

Question

Raspberry Pi

Rasberry pi + dlink dwa-126 (tried different whistles) does not want to work correctly with roaming (tried on Unifi outdoor points, then tried on the d-link dwc-1000 + 3600ap + 2600 ap controller) they do not switch between points. I will say that other other complete devices such as android or terminals on windows mobile work perfectly with both Unifi and D-link. We tried to connect dwa-126 to Ubuntu (although not quite the right comparison), but this adapter also works well in roaming with a laptop ... Tell me where to dig ... Thank you.