Firmware Release Notes SW01810-2.2.8.0

Supported products:
R-KEY-LT-P (Rev. D0)
Z-KEY-P (Rev. F0)
Z-KEY-P (Rev. F1)
Z-KEY-2ETH-P (Rev. B0)

FIX:
-Fix Profinet communication release with TCP packets.
-Fix function Modbus communication lock on Profinet communication failure
-Modified diagnostics (now on only one slot).