Since version 3.0.66 of the Emonio firmware, it has been possible to write telemetry data to a buffer. This happens automatically when telemetry is switched on but there is no connection to the telemetry server. Due to the amount of data generated, an SD card must be installed. If the Emonio meets the requirements, buffering is activated automatically.
The corresponding item in the settings is also available in the app with this version.