I have, off and on, over the years tried to get a wireless AC7 control surface working on several flavors of Cakewalk/Sonar and struggled mightily with the "Connecting..." issue.  Today, I solved it.  I just recently upgraded Sonar X1 to Platinum, hoping that there might be a fix in it which would allow my iPad-based AC7 CS to work so I didn't have to sit at my uncomfortable computer desk while trying to keep a creative attitude (I'm a wanna-be singer songwriter type who happens to make a living doing industrial automation programming).  The upgrade didn't help me.  I cleaned up my PC of old versions of Cakewalk, re-registered (via regsvr32 console command) the MackieControl DLL and it still didn't work.  After I found that Cakewalk had gone open-source on the Mackie Control protocol I went and hunted it down , renamed the version sitting in C:\Program Files\Cakewalk\Shared Surfaces, dropped the one I found on GitHub in there and registered it from the command line.  Now it works!  This has been a long, frustrating journey getting this to work, so I figured that maybe I should post this in the hopes that it may help others.
 
Cheers!
 
AutoDoc
 

Nice 
I tried it with my pad and SONAR, but did find it cumbersome, and I did not quite get it to work.
Will give it another try with your instructions.
Could you share the link to GitHub?
All the best.

github.com/Cakewalk/Cakewalk-Control-Surface-
SDK/blob/41698b4f92305b6e7ad4e5527916860f77652d68/Bin/x64/MackieControl.dll

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I have, off and on, over the years tried to get a wireless AC7 control surface working on several flavors of Cakewalk/Sonar and struggled mightily with the "Connecting..." issue.  Today, I solved it.

Congratulations and welcome to the club of CS hackers!
 

Hoooray AutoDoc! I never thougt that would work, but: Finally one Problem solved! :-D

Thanks

Well, although I have the "connecting" problem fixed, I am not seeing any feedback coming from the DAW to the control surface. You know, if I mute a track from the control surface, it shows as muted at the DAW, but the control surface doesn't annunciate it. It might be a simple fix, but I made the decision to start drinking Maker's Mark and now the normal unending desire to fix sh1t has left me. Maybe tomorrow.