For the sensors, are we assuming everyone is carrying a cell phone? So, WiFi being the protocol, cell phone signal detection will not be evaluated for Stage 2/3 ?

No, we are going to provide a sensor that you can use for your testing. You will still have to create the drone piece and have some sort of command server that will collect data from the drone and retrieve the JSON files and photos. Ideally, you will be taking the photos from your drone and sharing them with the command server. If you have a specific sensor you created, please read the Stage 2 Guidance Document to ensure it aligns with the Stage 2 requirements. The cell phone is one of the use cases, but what we are trying to test here in Stage 2 is a simple method; we are primarily interested in the data-gathering aspect of this. That is correct, No cell phone signal detection will be evaluated in Stage 2/3.