Thanks!!! it worked
after 2 X(clear cache and restart), it worked
i have kept the existing items with the 1.x format
i have added some new items in the 2.5 format to support my tuya items like explained below
till now, all my conf folder is stored in git .
All my things, items, rules are only defined in files.
so, till now in case of the new installation i had just to download the last openhabian version and a pull from git.
why? because it seems to be the most simple approach and with all the git advantages.
on the second side, i have to admit that it was really simple with the paper ui to define the mqtt things.
i will need to find a way to get those things exported maybe with a such script
https://community.openhab.org/t/recommended-way-to-backup-restore-oh2-configurations-and-things/7193
the command topic is well working
the state do not work yet. i need to parse the json file