This is a regular status update from your device indicating that everything is okay, the batteries are good and it is able to connect to the network. By default it is set to arrive once daily from the moment you complete the setup of your device, if you want to change the timing of when the regular update arrives, you can use App - Device Settings (connect via Bluetooth) - 'Test Device Connection', this will immediately push a regular update and set the update timer to start from that moment on a new cycle.
You can configure the frequency interval of the regular update also in Device Settings (connect via Bluetooth), using 'Regular Ping Interval', it can be changed from once every day, 2 days, 5 days, 10 days, 15 days, 20 days, 30 days, or 40 days. We recommend keeping it on the default daily interval so your device regularly checks its status and updates you that everything is okay. The battery drain of a regular update is very low, so there is no problem to leave it on the default setting.
In case you prefer not to receive regular Armed and Ready status updates, but would like to receive notifications in case there is an alarm or issue with your device. You can go to App - top-right corner head icon (account settings) - Turn ON 'Silent Monitor', and this will silence regular updates but allow other notifications to arrive normally.
In case there would be any issues with your device you would not receive this message and instead receive an alternate notification for example "Missing Regular Ping" or "Signal lost" notification, or low battery amongst other various messages.