when application not use the sound effect not work
so i use sound effect as alarm
so when close application must work
no have any solution for this problem ???

The application on the phone plays the sound when it receives the sound code number from the board.

If the app is not running, or has lost communications with the board, then how can it possibly play the sound ?

I think you'll need to add a "smart" app to your phone that can receive "Push" notifications, and set up a connection from the board over WiFi. I'm no expert on this, it took me numerous attempts to get a "smart light dimmer" working with eWeLink.... 

Perhaps there is someone who can help further.....