This is a simple Python module for Blender - Game network communication. This allow UDP connections in which `json` object are sent.

blender_net.py

# Server
# To use it:
#  - Load this script in Blender Note editor as `net.py`
#  - Select the objects that should handle the network logic (for example an empty or the camera)
#  - Add an Always sensor with only raise up
#  - Add a python controller as a module, that calls `net.serve`
#  - connect sensor and controller
#  - enjoy

import bge
import socket
import json

### Helpers ###

## Parser method
def _parser(js):
  print("the variable js contains an object")
  # In this function it is possible to parse
  # tha object and execute something.
  return
  
#################################
# Network class
class Server:
    def __init__(self, host='localhost', port=9999):
        self.addr = (host, port)
        self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.socket.setblocking(False)
        self.socket.bind(self.addr)

    def handle(self, addr, data):
        print("=" * 20)
        print("from %s: %s" % (addr,data))
        response = self.parser(data)
        print("Response:")
        print(response)
        #resp_text = json.dumps(response)
        #self.socket.sendto(resp_text.encode(), addr)
        return

    def receive(self):
        while True:
            try:
                data, addr = self.socket.recvfrom(1024)
                self.handle(addr, data.decode())
            except socket.error:
                break

    def parser(self, data):
        try:
            _json = json.loads(data)
        except json.decoder.JSONDecodeError:
            print("JSON data not valid")
            return None
        return _parser(_json)

#####################################
# Actually executed commands every frame
server = Server()
# server = Server('www.google.com', 80)

# Module function for Game Logic
def serve():
    server.receive()