Home Assistant via MQTT

Hello!
I also killed my Friday with reated project, stucked at mqtt from broker (dridged with local broked +msh) I see messages on MQTT explored as such: "
Z
��������*0�1��j��I�L��vH� 爺�5s��f��:m_�0-ڸ�\7y��5V�6’=(m�eE�@H`���������LongFast
" to me is it related to encryption if yes, how to decrypt?

msh_2023-12-31_15-34

+in documentation it say to use such format:
state_topic: “msh/2/json/LongFast/!67ea9400”

why tere is /json/ there? in explores I dont see such prefix. tried both, in HA values are " unknown" .

Thanks in advance!