1.1 The Socket Server is a Windows Form running in Visual Studio 2017 Community, written by Python with IronPython 2.7 (32 bit) 1.2 The Socket Client is running in your EV3 Brick installed with EV3Dev ...

Current python-ev3 is not stable enough, virtualenv is recommend. Below examples are in virtualenv. However, python-ev3 should work in a native python environment.

The only time to pickle something is if you need to represent a non-string object on disk, but Python code is strings. I presume that the receiving program is basically calling eval (skt.recv ()).