Thanks Lucian for the leads. But, even exploring different ways to write from central to peripheral from the post you gave I haven’t succeed to write on the peripheral. The peripheral does not react to the writings even though the write seems working well (the serial print on terminal call all the callback as they should).
I understood that there is to way to do (notifying the peripheral which subscribe to change on central, or direct write from central to peripheral). But in both attempts, I failed to make it works.
Would that be possible to someone to post a small but complete example of central to peripheral writing?
Thanks in advance for the help!