Flush network stream recieve buffer before starting request

[lukasfischer83]

I am trying to recover from connection losses (unplug cable, plug back in).

Symptom: I get answers to old requests instead of the current one after the connection is reestablished.

How to reproduce: After loosing connection I try reconnecting until success. Then reading continues.

Solution This seems to be fixed by making sure, that the revieve buffer of stream is empty before sending a request in for example ReadHoldingRegisters() in the ModbusClient class:

while (stream.DataAvailable) // flush old rcv buf { Byte[] trash = new Byte[256]; Console.WriteLine("{0} bytes Garbage read from stream", stream.Read(trash, 0, 256)); }

Using VS Express 2015 and .NET 4.5