Christian

Improve async lock

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This pull request adds a new implementation of the Async Lock which has no longer a dead lock issue.

This PR changes the CI so that the preview MyGet build is added as a comment which contains the changes.

This PR exposes the certificate selection handler in SSL stream via client options.

This PR restores supporting _null_ as a valid parameter for the config callback when using _AddServer_ from the ASP.NET integration.

Add io.github.chkr1011.mqttMultimeter

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### Please confirm your submission meets all the criteria - [x] Please describe the application briefly. mqttMultimeter is a cross platform MQTT Desktop Client. - [x] The domain used for...

This PR applies several automatic code changes to to support of new language features. Most of them have no impact regarding functionality (i.e. collection initializer, init instead of internal, using)....

[Draft] Add new PowerShell module

1

This PR adds a new project which contains a PowerShell module so that MQTTnet can also be used in PowerShell.