It is now connected to very old D-Link DES1008 and I have no problems. Controler works stable and I always can log in. I have tried with my HUAWEI HG8245 optic fiber router and also works great for a long time, even Huawei has 1GBit lan.
I will buy new Tp-Link switch and test it with opensprinkler and i think (I have hope) it would be ok. Mayby my old version (TL-SF1005D Ver:7.0) has problems with ENC chip.
Thanks for replay. In my country is winter now so I have plenty of time to test all function of opensprinkler