Open Modbus/TCP V5.3.0.2

• Fix: see change log

• netX90 Usecase C requires Maintenance Firmware V1.3.0.0 or newer
• netX90 Usecase A is compatible to Maintenance Firmware V1.1.0.x or newer

Starting with version 5.2.0, the firmware/stack requires netX 90 with date code 1910 and later.
If a NXHX 90-JTAG is used, hardware revision 4 or higher is required. netX 90 samples (date code before 1910)
are no longer supported which is the case for NXHX 90-JTAG hardware revision 3 or lower.