Output only satellite (#182)

Output only satellite for nodes with only speakers and no microphone.
Supports announcements and playing media only.

---------

Co-authored-by: Florian Asche <github@florian-asche.de>

linux_voice_assistant/__main__.py

@@ -156,6 +156,11 @@ async def main() -> None:
         action="store_true",
         help="Add this to enable debug logging",
     )
+    parser.add_argument(
+        "--output-only",
+        action="store_true",
+        help="Enable output only mode (Satellite supports announcements only)",
+    )
     args = parser.parse_args()
 
     if args.list_input_devices:
@@ -351,6 +356,7 @@ async def main() -> None:
         preferences=preferences,
         preferences_path=preferences_path,
         refractory_seconds=args.refractory_seconds,
+        output_only=args.output_only,
         download_dir=args.download_dir,
         volume=initial_volume,
         timer_max_ring_seconds=args.timer_max_ring_seconds,

linux_voice_assistant/models.py

@@ -94,6 +94,7 @@ class ServerState:
     wake_words_changed: bool = False
     refractory_seconds: float = 2.0
     thinking_sound_enabled: bool = False
+    output_only: bool = False
     muted: bool = False
     connected: bool = False
     volume: float = 1.0

linux_voice_assistant/satellite.py

@@ -63,7 +63,18 @@ class VoiceSatelliteProtocol(APIServer):
         self.state.satellite = self
         self.state.connected = False
 
+        # Report capabilities appropriately
+        if state.output_only:
+            _LOGGER.debug("Output only features")
+            self.supported_features = VoiceAssistantFeature.API_AUDIO | VoiceAssistantFeature.ANNOUNCE
+        else:
+            _LOGGER.debug("Voice assistant features")
+            self.supported_features = (
+                VoiceAssistantFeature.VOICE_ASSISTANT | VoiceAssistantFeature.API_AUDIO | VoiceAssistantFeature.ANNOUNCE | VoiceAssistantFeature.START_CONVERSATION | VoiceAssistantFeature.TIMERS
+            )
+
         existing_media_players = [entity for entity in self.state.entities if isinstance(entity, MediaPlayerEntity)]
+
         if existing_media_players:
             # Keep the first instance and remove any extras.
             self.state.media_player_entity = existing_media_players[0]
@@ -287,9 +298,7 @@ class VoiceSatelliteProtocol(APIServer):
                 mac_address=self.state.mac_address,
                 manufacturer="Open Home Foundation",
                 model="Linux Voice Assistant",
-                voice_assistant_feature_flags=(
-                    VoiceAssistantFeature.VOICE_ASSISTANT | VoiceAssistantFeature.API_AUDIO | VoiceAssistantFeature.ANNOUNCE | VoiceAssistantFeature.START_CONVERSATION | VoiceAssistantFeature.TIMERS
-                ),
+                voice_assistant_feature_flags=self.supported_features,
             )
         elif isinstance(
             msg,