Yes, it is possible to configure multiple wifi networks as long as they are not present at the same time.
Jooki will try to connect to the networks it has been configured for. If it does not succeed it will enter wifi-setup mode automatically. If you take Jooki to a new place where it doesn't know the Wifi, simply turn it on and wait until it enters wifi setup mode.
One example of a supported scenario could be:
- Jooki is configured to connect to the network at home
- Jooki is also configured to connect to the network at the grandparents
(This is under the assumption that the the grandparents live sufficiently far away)
Connecting Jooki to the "Home" and "Home-Guest" networks if they are present at the same place is not possible. Only one of the two can be used.