Add BLE layer: firmware, coordinator support, dashboard tab

firmware/ble_node/config.h

@@ -0,0 +1,23 @@
+#pragma once
+
+// ─── WiFi (for UDP transport only) ───────────────────────────────────────────
+#define WIFI_SSID        "sandbox"
+#define WIFI_PASSWORD    "Jaunsgads11!!"
+
+// ─── Coordinator ─────────────────────────────────────────────────────────────
+#define COORDINATOR_IP   "192.168.1.133"
+#define COORDINATOR_PORT 5005
+
+// ─── BLE scan ────────────────────────────────────────────────────────────────
+#define BLE_SCAN_DURATION_SECS  5     // each passive scan window (seconds)
+#define BLE_FLUSH_INTERVAL_MS   5000  // how often to flush queue to coordinator (ms)
+#define HEARTBEAT_INTERVAL_MS   10000 // heartbeat cadence (ms) — same as WiFi nodes
+
+// ─── Dedup ───────────────────────────────────────────────────────────────────
+// Suppress the same MAC within this window. Randomised-MAC devices will
+// reappear when their MAC rotates (typically every 10–15 min), which is fine.
+#define BLE_DEDUP_SECS       30   // seconds before the same MAC is allowed again
+#define BLE_DEDUP_CACHE_SIZE 300  // ring-buffer size; BLE sees far more MACs than WiFi
+
+// ─── Queue ───────────────────────────────────────────────────────────────────
+#define BLE_QUEUE_SIZE 256        // events buffered between flushes