Algorithm 2 BlueDetect IO detection and localization algorithm (Semi-outdoors ⇌ indoors).

input: B - Bluetooth signal (iBeacon), W - WiFi signal, ${\sigma }_t$ - duration threshold output: Location of the mobile device if $B_{indoor}<B_{semi-outdoor}$ for ${\sigma }_t$ then     Turn off WiFi;     Utilize B for localization;     Environment Type ← Semi-outdoor else     Utilize W for localization;     Environment Type ← Indoor end if