I don’t know if the development world needs another .NET MQTT library, but I wrote one a few years ago and finally decided to dust it off and publish it in source form and as a NuGet package. I considered doing a PCL version, but then I looked at the source and was reminded that the library heavily uses sockets and threads and figured that’s a bit more work than I feel like putting into it right now.
It’s fully functional and pretty solid. I used it in a production app, so it’s not just an experimental library.
Package is in NuGet [id: opennetcf-mqtt]