Possible null reference return.

Possible null reference return.

Use 'GeneratedRegexAttribute' to generate the regular expression implementation at compile-time.

Use 'GeneratedRegexAttribute' to generate the regular expression implementation at compile-time.

Possible null reference return.

Use 'GeneratedRegexAttribute' to generate the regular expression implementation at compile-time. (https://learn.microsoft.com/dotnet/fundamentals/syslib-diagnostics/syslib1045)

Cancel synchronously blocks. Await CancelAsync instead. (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD103.md)

Use 'GeneratedRegexAttribute' to generate the regular expression implementation at compile-time. (https://learn.microsoft.com/dotnet/fundamentals/syslib-diagnostics/syslib1045)

Possible null reference argument for parameter 'payload' in 'Task<PublishResult> HiveMQClient.PublishAsync(string topic, byte[] payload, QualityOfService qos = QualityOfService.AtMostOnceDelivery)'.