Hello Apple (yosemacbook) family,
we all know and experienced how bad could be a whole year without working bluetooth and wifi together. Actually after trying over 20 fixes from all around the globe internet sources, I found very strange and simple how to manage this problem. Btw all those fixes were temporary, ye wifi was working for around half an hour but than hangover came back.
My solution for working wifi with bluetooth is quite simple:
You need to setup your router right way, after many and many test of various routers and different places to log into with my bluetooth accessories I figured out, that all the wifi connection which were "public" in the street etc without any protection or password WORKED PERFECTLY, while any WPA2 secured wifi was a garbage together with bluetooth.
So how I solved this? I reset my router to a factory settings, so I would start with fresh router, setup a new name (ssid) to my router, told my macbook (rmbp 15 late13) to remember that router. Security/privacy let to stay "unprotected" (many of you can say aaaa thats strange i won't do that, but follow the reading) and told the router to "don't stream SSID name" so others can't find that router to join. While some advanced users still can manage join to hidden router, I gave them a ban for joining, due to setting up an advanced MAC address protection, so only my macbook, my smartphone, friends notebooks etc which was joined to the router before the reseting could join back and get online. (that's inside every router settings to allow connection of specific mac dresses only)
And bluetooth vs wifi solved for me and 3 of my friends.
Ofc I did a clean install of yosemite twice, but for you who are not able to spend over 8hours of setting all the programs and apps required for work like I did, I won't recommend you to reinstall whole your OS, just reinstall/setup the router the right way.
Give it a shot, because I would bet one of those hours I spent figuring what could be wrong, that this could help you. Maybe first try another router to reset into "unprotected" wifi or go your local café/square for joining into public wifi and testing if it works, than setup your router at home/work 😉
All the best,
Tomas
PS: Got an old TP-Link router with 2,4 only, haven't tested 5GHz routers... I know it looks like a hard way how to setup all your gear at home with their MAC address but take care of data you sent to internet and don't allow anyone else to join your network 🙂