co⚡e: Sparkplug™ MQTT edge

FUNCTION ReturnFileName : WSTRING
VAR_INPUT
PT := ADR(FileName);
            iLength := TO_INT((SIZEOF(FileName) - RightMostAfterLastSlash)),
            iPosition := TO_INT(RightMostAfterLastSlash),
            pwstResult := ADR(ReturnFileName),
            uiResultBufferSize := SIZEOF(ReturnFileName));