Hello,
I am using the mqtt integration and I wanted to use HA for publishing some sensors data to other smarthome softwares.
I found the the mqtt_statestream should be the correct option, it is but I am publishing too much data while I want to publish only 9 sensors values. 
I read the documentation many times but I can’t reach my goal.
At the beginning, I have only added the 9 sensors below the include / entities but I’ve got everything that HA could published. So I added the exclude with almost everything but I still get everything.
Here is my yaml configuration
mqtt_statestream:
base_topic: homeassistant
publish_attributes: false
publish_timestamps: false
include:
entities:
- sensor.cave_temperature
- sensor.frigo_congel_temperature
- sensor.frigo_us_temperature
- sensor.salon_temperature
- sensor.home_temperature
- sensor.salon_humidite
- sensor.home_humidite
- sensor.pluie_intensite_des_precipitations
- sensor.pluie_precipitation
exclude:
domains:
- binary_sensor
- switch
- lawn_mower
- light
- number
- button
- text
- camera
- device_tracker
- vacuum
- select
- automation
- update
- siren
- weather
- lock
- media_player
- person
- zone
- climate
- sun
If anyone could help, I may have misunderstood something, but I don’t find what.
Thanks
JC