import snap7
import time
from snap7.types import Areas
from ctypes import c_char, byref, sizeof

class MyServer(snap7.server.Server):
    pass

s = MyServer()
area_m = (c_char * 160)()
s.register_area(snap7.types.srvAreaMK, 0, area_m)
s.start(tcpport=1102)
while True:
    ev = s.pick_event()
    if ev is None:
        time.sleep(1)
    else:
        print(s.event_text(ev))