[Breaking] Deactivate Home Assistant presence per default (#915)

And enable to activate it by MQTT

docs/integrate/home_assistant.md

@@ -168,6 +168,8 @@ sensor:
 
 ### MQTT Room Presence
 
+The publication into presence topic needs to be activated [here is the command](../use/ble.md)
+
 ```yaml
 sensor:
   - platform: mqtt_room

docs/use/ble.md

@@ -133,6 +133,13 @@ If you want to change this characteristic:
 With Home Assistant, this command is directly avalaible through MQTT auto discovery as a switch into the HASS OpenMQTTGateway device entities list.
 :::
 
+## Setting if the gateway publish into Home Assistant Home presence topic
+
+If you want to publish to Home Assistant presence topic, you can activate this function by the HASS interface (this command is auto discovered), [here is a yaml example](../integrate/home_assistant.md#mqtt-room-presence).
+Or by an MQTT command.
+
+`mosquitto_pub -t home/OpenMQTTGateway/commands/MQTTtoBT/config -m '{"hasspresence":true}'`
+
 ## Setting the minimum RSSI accepted to publish device data
 
 If you want to change the minimum RSSI value accepted for a device to be published, you can change it by MQTT. For example if you want to set -80