diff --git a/firmware/src/main.cpp b/firmware/src/main.cpp
index b3eea6c..9767a87 100644
--- a/firmware/src/main.cpp
+++ b/firmware/src/main.cpp
@@ -137,10 +137,24 @@ static void task_reporter(void*) {
 
         reporter_submit_camera(g_cfg, cam_rec);
         reporter_submit_ble(g_cfg, ble_rec);
-        reporter_heartbeat(g_cfg, millis() / 1000, WiFi.RSSI());
+        bool hb_ok = reporter_heartbeat(g_cfg, millis() / 1000, WiFi.RSSI());
 
         ble_scanner_reinit();
         led_set(false);
+
+        static uint8_t consecutive_misses = 0;
+        if (hb_ok) {
+            consecutive_misses = 0;
+        } else {
+            consecutive_misses++;
+            event_log_write(EVT_HEARTBEAT_MISS, consecutive_misses, 0);
+            Serial.printf("[WDG] heartbeat miss %u/6\n", consecutive_misses);
+            if (consecutive_misses >= 6) {
+                event_log_write(EVT_REBOOT, REBOOT_HEARTBEAT_MISS, 0);
+                delay(200); // let NVS commit before reboot
+                ESP.restart();
+            }
+        }
     }
 }