Issue 1 — Discord Audio (PulseAudio)

docker-compose.yml: Added a pulse_socket named volume mounted at /run/pulse in both op25 and edge-node. Also set PULSE_SERVER=unix:/run/pulse/native in edge-node so libpulse (and ffmpeg's pulse input) finds the right socket.

discord_radio.py: Removed _icecast_url and changed _play_stream() to use -f pulse -i default.monitor. This reads directly from the PulseAudio sink monitor — zero buffer delay. The PULSE_SERVER env var is inherited by the ffmpeg subprocess.

Note: default.monitor captures whatever audio is playing on the default sink. If OP25 uses a named virtual sink, you may need to replace default.monitor with <sink_name>.monitor (run pactl list sinks short inside the op25 container to find the name).

Issue 2 — No audio URL / GCS credentials

storage.py: storage.Client() was using ADC but ADC isn't configured in the container. Now uses storage.Client.from_service_account_json(settings.gcp_credentials_path) when GCP_CREDENTIALS_PATH is set — same credential file Firebase already loads.

You also need to mount the key file into the server container in docker-compose.yml:

c2-core:
  volumes:
    - ./gcp-key.json:/app/gcp-key.json:ro
And set GCS_BUCKET=your-bucket-name in .env.

Issue 3 — Token orphaning

mqtt_manager.py: Every checkin now includes "discord_connected": radio_bot.is_connected.

mqtt_handler.py: On checkin, if discord_connected is explicitly False, calls release_token(node_id). Only fires on explicit false (missing field = unknown = no action).

node_sweeper.py: When a node is swept to offline, its token is released too. This covers the case where the node stops checking in entirely (crash/power loss).

drb-c2-core/app/internal/mqtt_handler.py

@@ -109,6 +109,11 @@ class MQTTHandler:
                 updates["status"] = "online"
             await fstore.doc_update("nodes", node_id, updates)
 
+        # Release any orphaned Discord token when the node explicitly reports disconnected
+        if payload.get("discord_connected") is False:
+            from app.routers.tokens import release_token
+            await release_token(node_id)
+
     # ------------------------------------------------------------------
     # Status update
     # ------------------------------------------------------------------

drb-c2-core/app/internal/node_sweeper.py

@@ -53,3 +53,5 @@ async def _sweep():
             node_id = node.get("node_id")
             await fstore.doc_update("nodes", node_id, {"status": "offline"})
             logger.info(f"Node {node_id} marked offline (last seen: {last_seen.isoformat()})")
+            from app.routers.tokens import release_token
+            await release_token(node_id)

drb-c2-core/app/internal/storage.py

@@ -12,6 +12,9 @@ async def upload_audio(data: bytes, filename: str) -> Optional[str]:
 
     def _upload() -> str:
         from google.cloud import storage
+        if settings.gcp_credentials_path:
+            client = storage.Client.from_service_account_json(settings.gcp_credentials_path)
+        else:
             client = storage.Client()
         bucket = client.bucket(settings.gcs_bucket)
         blob = bucket.blob(f"calls/{filename}")