I have WIZ107SR modules, H/W version 1.4, firmware version 4.03 (date of production 2013).
Previously, I used the modules in H/W version 1.1, firmware version 1.9 – and everything worked properly.
Now I have problem – in UDP protocol I can’t connect (send bytes) from many computers (clients).
Module communicates (accept data) only from one computer – whose the IP address is entered in the field “Remote IP/host name”.
In old version of modules I can communicates from many computers (clients) without problem.
In my solution I have to connect to the module with a few laptops and tablets.
How to solve it?
I checked the modules with firmware 1.9 and 4.01 and working properly.
It seems that version 4.03 has a bug!