Have you moved or do you have a new smart meter? Then you may want to delete all data from the Smile P1. All data, including charts, rates and connected apps, will be irreversibly deleted.
Please note, this is at your own risk! If you don't want historical charts to be deleted, don't do a reset.
You can completely reset the Smile P1 by pressing the black button for 15 seconds. This does not delete the network settings.