Start adding code to close connects when app is sent to background.
Add Wii U Pro controller driver;	WiiPair-iOS can pair this using the pre-existing WiiMote pairing code but it can’t be used without a patched BTdaemon:

BTstack automatically sends hci_accept_connection_request with the role parameter set to 1 (stay slave) but the Wii U Pro controller requires role to be set to 0 (become master). With Wii Remotes it is enough to set a switch_role command right after connection, but Wii U Pro controllers won’t work this way.