ok, now it works, note that I must hit the ALT + SHIFT key for having a beautiful "{" / "}" chars, 
note that in the italian keyboard there is the AltGr key which, for now, still didn't works(as said, I do instead ALT+GR for getting the braces).
I'll continue to work on it until the end.
Regards,

Il giorno lun 22 mar 2021 alle ore 08:48 Christian Helmuth <christian.helmuth@genode-labs.com> ha scritto:
Hello Edoardo,

On Sun, Mar 21, 2021 at 19:06:59 CET, Edoardo Mantovani wrote:
> UPDATE:
> I am working for improve the quality of the keyboard, for now I was able to
> add the "[", "," and the "]" to their right keys.
> Only one problem, I do NOT know the "false"/"true" sequence needed for
> SHIFT-ALTGR, I need it for implementing the "{" / "}"
> if anyone knows that, please let me know,
> I have tested some of the four combinations, but none works for now.
> Otherwise, I send the fixed chargen, day by day it will become even better.
>
> ( I am referring to the: <map mod1="false" mod2="true" mod3="true"
> mod4="true"> structure ).

The standard event_filter config states

  <mod1>
    <key name="KEY_LEFTSHIFT"/> <key name="KEY_RIGHTSHIFT"/>
  </mod1>
  <mod2>
    <key name="KEY_LEFTCTRL"/> <key name="KEY_RIGHTCTRL"/>
  </mod2>
  <mod3>
    <key name="KEY_RIGHTALT"/> <!-- AltGr -->
  </mod3>
  <mod4>
    <rom name="capslock"/>
  </mod4>

So if you didn't change this, the combination you look for is

  <!-- SHIFT-ALTGR -->
  <map mod1="true" mod2="false" mod3="true" mod4="false">

Please note, that CTRL is set to false and, thus, must not be pressed
for the mapping to work. If you use the xkb2ifcfg tool [1] it generates
mapping entries for all supported combinations.

[1] https://github.com/genodelabs/genode/tree/master/tool/xkb2ifcfg

Greets
--
Christian Helmuth
Genode Labs

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Edoardo Mantovani
Independent security researcher
email: Baseband@cpan.org
Urbino, Italy