For your information, I open a ticket to the ST support, and I got the answer for these behaviors: For the case declaration of a characteristic with CHAR_PROP_WRITE_WITHOUT_RESP and ATTR_PERMISSION_ENCRY_WRITE, but I can write into the characteristic...

Hi @crwper , @STTwo-32 I got the same issue- declaration of a characteristic with CHAR_PROP_WRITE_WITHOUT_RESP and ATTR_PERMISSION_ENCRY_WRITE, but I can write into the characteristic without to be paired,- declaration of a characteristic with (CHAR_...