Figure 9.7: connected lighting can do more than conventional lighting, but the
conceptual model is more complex. (Lightbulb by Marek Polakovic, wireless
icon by Spencer Harrison. plug by Vithin Viswanathan, light switch by Sarah
Hutchinson, all from the Noun Project.) MAY NEED WIFI GATEWAY
ADDING
When everything is working well and connected, users don’t need to concern
themselves with which code is running where. But if a part of the system
develops a fault or loses connectivity or the network is slow, the impact will
depend on what that device is doing. Will the lights (or intruder alarm, or
heating) stop working if the user’s phone battery runs out or they have no
signal? Or will they keep running even if the user cannot remotely access the
home at that point? What if the home internet connection goes down? Will
lighting rules continue to work locally? If they are stored in the gateway or
edge device, they will. If they are stored in the internet service or smartphone,
they will not (see figure 9.8).