I bought a cheap USB Bluetooth 4.0 dongle from Amazon and have it permanently plugged into the USB port so that for emergencies at gigs I can use my tablet or phone to tweak things via the web UI. It’s painfully slow but workable in a pinch. I presume that Bluetooth 5.0 would make things much more bearable but unfortunately I can’t find any newer than 4.0 for sale anywhere 
The only ones available are advertised as audio-only and therefore presumably not usable for ethernet networking over Bluetooth.