How can i send and save data to online server then receive it on other device?

[Alpha2020]

You can use this extension-

[PAID] Alarm Manager Extension with Notification or Autostart

Description Alarm Manager Extension to send a notification or autostart the app at a given time or at boot time only once or repeated by interval (15 minutes, half hour, hour, half day, day and week, month and year). After clicking the notification your app will be started. You can define a start text, which will be passed to your app in method 'get plain start text' and trigger some action after your app is started. You also can define several alarms, just use a different id for each alarm. A…

or

https://community.kodular.io/t/backgroundtasks-extension-paid/73771