How are passers-by and visitors different?

Mobile phones emit a signal (probe request) with a set of information that WiFi networks are capable of capturing and sending to Flame for analysis and processing. If this signal is very powerful, we consider that the visitors are inside and if it is weaker, we consider that they are outside the physical space. Furthermore, this intensity variable is linked to the time variable. If a signal is strong but we receive it for a very short time, it does not count as a visit (perhaps it is looking at the shop window or passing in front of the physical spaces).