join: description: Group players together. fields: master: description: Entity ID of the player to synchronize to. example: "media_player.living_room" entity_id: description: Entity ID of the players to join to the "master". example: "media_player.bedroom" unjoin: description: Unjoin the player from a group. fields: entity_id: description: Entity ID of the player to unjoin. example: "media_player.living_room" snapshot: description: Take a snapshot of the media player. fields: entity_id: description: Name(s) of entities that will be snapshotted. Platform dependent. example: "media_player.living_room" restore: description: Restore a snapshot of the media player. fields: entity_id: description: Name(s) of entities that will be restored. Platform dependent. example: "media_player.living_room" set_latency: description: Set client set_latency fields: entity_id: description: Name of entities that will have adjusted latency latency: description: Latency in master example: 14