Mono C# TCP Socket Server Blocking UART Serial Port (Raspberry Pi)

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Mono

.NET

Linux

sockets

serial

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I have raspberry Pi . I use it as a server. I wanna get commands with clients (other devices like android devices) and control microcontroller with UART serial port. I wrote async TCP Socket server with mono C#. Like [this]. http://msdn.microsoft.com/en-us/library/fx6588te.aspx

I can use UART Serial Port without TCP Socket Server. But it is not working with Socket Server.

I try some multithread ways. But i cant success. How can i solve it?