Initial commit — DRB client (edge node) stack

Includes edge-node (FastAPI/MQTT/Discord voice), op25-container (SDR decoder),
and icecast (audio streaming).

drb-edge-node/app/internal/config_manager.py

@@ -0,0 +1,43 @@
+import json
+from pathlib import Path
+from typing import Optional
+from app.config import settings
+from app.models import NodeConfig, SystemConfig
+from app.internal.logger import logger
+
+_CONFIG_FILE = Path(settings.config_path) / "node_config.json"
+
+
+def load_node_config() -> NodeConfig:
+    if _CONFIG_FILE.exists():
+        try:
+            data = json.loads(_CONFIG_FILE.read_text())
+            return NodeConfig(**data)
+        except Exception as e:
+            logger.warning(f"Could not load node config, using defaults: {e}")
+
+    return NodeConfig(
+        node_id=settings.node_id,
+        node_name=settings.node_name,
+        lat=settings.node_lat,
+        lon=settings.node_lon,
+        configured=False,
+    )
+
+
+def save_node_config(config: NodeConfig) -> None:
+    _CONFIG_FILE.parent.mkdir(parents=True, exist_ok=True)
+    _CONFIG_FILE.write_text(config.model_dump_json(indent=2))
+    logger.info("Node config saved.")
+
+
+def apply_system_config(system_config: SystemConfig) -> bool:
+    """Write the OP25-compatible config blob to /configs/active.cfg.json."""
+    try:
+        active_cfg = Path(settings.config_path) / "active.cfg.json"
+        active_cfg.write_text(json.dumps(system_config.config, indent=2))
+        logger.info(f"System config applied: {system_config.name}")
+        return True
+    except Exception as e:
+        logger.error(f"Failed to write system config: {e}")
+        return False