The evanell° devices measure the temperature once a minute and use these values to control your heating system.
However, values in the applications are only updated on changes of at least 0.5 °C. This threshold optimizes battery lifetime.
Regardless of this threshold, the devices report their current temperature at least every 20 minutes. When the apps have not received an updated temperature value for more than 30 minutes, they show that currently no Device Offline error in the APP.