Add support for L2CAP

[fzy-github]

Hey,
Congratulations on this awesome library. I have been using it in few of my applications and it was a lifesaver. Unfortunately it seems that I have reached current limits of this library when trying to work with L2CAP which is not supported:

IOS-CoreBluetooth-Mock/CoreBluetoothMock/CBMCentralManagerMock.swift

Line 1630 in d1e0321

fatalError("L2CAP mock is not implemented")

It would be great to add this support to make the library one step closer to be feature complete

[philips77]

I never had the opportunity to try this on the native API. I is a very cool feature and perhaps it's not that diffucult to add support for. If you could create a PR with the implementation, that would be amazing. We will gladly merge it and release.

If you would like us to implement this feature, I hardly see this coming this year.

Thank you from the mountain!

[fzy-github]

Understood, thanks. I have an idea in mind already after poking with the source code a little bit but I need some spare time to prototype it. Will definetly keep you updated