On iOS, we can obtain the SSID of the network you are connected to, but we cannot obtain a list of networks in the vicinity. (Both work on Android; on iOS the list functionality is a private API.) So, we have two options:
Option 1: Ask them to type the SSID if it's not the one they're connected to.
Option 2: Have the sensor use its WiFi chip to scan for the list of networks, and have the phone retrieve the list from the sensor. (Introduces dependency on sensor being in range for this step.)
UX/Sensor folks, thoughts?