feat(const): persistent-connection timing constants — watchdog backoff/cap/jitter, StateStore TTL

custom_components/nvidia_shield/const.py

@@ -26,6 +26,14 @@ ADB_POLL_INTERVAL = 10  # seconds
 ADB_RETRY_INTERVAL = 300  # seconds before retrying a failed ADB connection
 DEFAULT_ADB_PORT = 5555
 
+# Persistent-connection manager timing (Phase 1, docs/MVP_PLAN.md §2):
+# watchdog reconnects with exponential backoff + jitter; ADB-derived store
+# fields expire (B5) instead of clinging to stale values.
+ADB_RECONNECT_BACKOFF_START = 5   # seconds before the first reconnect retry
+ADB_RECONNECT_BACKOFF_CAP = 300   # seconds; backoff never sleeps longer
+ADB_RECONNECT_JITTER = 0.25       # ±25 % randomization against reconnect storms
+STATE_STORE_TTL = 60              # ADB-sourced fields older than this are stale
+
 DEFAULT_NAME = "Nvidia Shield"
 
 # Emotiva DAG attribute we read to get available inputs