ota updater revise: networking issues

opencv-motion-detect/updater.py

@@ -144,7 +144,11 @@ class OTAClient:
             except Exception as e:
                 logger.error("network failure - failed to connect mqtt host: {}".format(str(e)))
                 # NOTE: reset network and evdaemon
-                os.system("systemctl restart networking; systemctl restart evdaemon")
+                if retry < 2:
+                    os.system("systemctl restart networking; systemctl restart evdaemon")
+                else:
+                    # we don't force restart component in the last round. since network recover may need a small delay
+                    time.sleep(10)
             retry += 1
         # NOTE: IT SHOULD NEVER REACH HERE unless network issues.
         logger.error("exiting since network failure")