For DEERTiME Devices
Please check the following settings and allow this app to run in the background.
[English]
https://jspsoft.co.kr/board_view.php?id=14
[한국어]
https://jspsoft.co.kr/board_view.php?id=16
[German]
https://jspsoft.co.kr/board_view.php?id=15