Use the Modbus protocol times Java.net.SocketException:recvfrom Failed:econnreset solution in Android programs

Recently in the development of basic Modbus Protocol of the Android PLC control program, C # version of the program does not have any problems, moved to Java under a variety of problems, which is more troubling is Java.net.SocketException:recvfrom failed: Econnreset error.

My solution was to switch off the socket every time I sent a piece of data to the PLC, but it was too extreme.

After analysis of the packet size I set to 256, when writing 1 register value, Modbus server directly error, switch off the socket connection, the size of the packet sent to the actual size to solve the problem.

(C # version of the program is also set to 256, no this phenomenon)