Add support for discovering ONLY one service when desired. Fix broken…

[tony-gutierrez]

… passing of Uuids to winrt C code.

This is for improved speed when the user only wants one service. This change is in the main noble-uwp already if you prefer to pull it from there.

[acstacey]

Looks good, thanks 👍

[tony-gutierrez]

There's another pr in the main repo to fix the connectable flag. Unfortunately I'm going to have to abandon noble-uwp (for noble-winrt), just can't get it to be stable when scanning for more than a few hours. Something is wrong in the nodert code somewhere.

[acstacey]

Have you had success with making connections in noble-winrt? I noticed you commented on this issue: Timeular/noble-winrt#10
I haven't tried it for a while as noble-uwp has been ok for me (I only scan for a minute or less at a time)

[tony-gutierrez]

noble-winrt works on par with UWP, while using less ram. I am able to scan constantly for days with no issues, where uwp will crash.

I havent had your exact problem with the characteristics callback not firing, but occasionally I have seen that "no service exists" error. I discover a single service using Peripheral.discoverSomeServicesAndCharacteristics, instead of the nested method you had in your example, and it seems to work fine most of the time.

I found this branch, https://github.com/fido-alliance/noble-winrt, and the author has added some better error handling, and made some other tweaks. I wish the noble world wasn't so fragmented, but it seems that you just have to seek out the best of everyone's tweaks.

Also, people always package their binding as a noble replacement (including original noble, or https://github.com/abandonware/noble, or their own custom noble) instead of just simply publishing it as a binding that can be used with any noble. So it make merges and pull requests harder.

[acstacey]

Thanks for the tip, I only need one service so will try that in a couple of weeks. Yeah it's frustrating trying to piece together the best versions. I'm hoping abandonware noble will merge in winrt bindings at some point

[tony-gutierrez]

Here's my latest winrt with all the fixes I have found a need for so far. https://github.com/tony-gutierrez/noble-winrt