Using M2Mqtt on Windows IoT Core ? It’s possible !
The compiled package available on Nuget with latest 22.214.171.124 release include the WinRT version that can be used on Windows 8.1, Windows Phone 8.1 and of course on Windows 10 following the UWP (Universal Windows Platform) model : one application for all platforms from PC to smartphone and IoT.
On Paolo Patierno’s blog you can find a simple walkthrough to use M2Mqtt on a Raspberry Pi 2 with latest release of Windows IoT Core. As Paolo said … it’s a simple marriage !