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The Nest Wave feature could be disabled unintentionally, so the Nest company stopped selling its smoke detector and fixed the glitch. Now the Nest Protect is the best WiFi smoke detector & CO monitor for iOS(iPhone/iPad) and Android smartphone on the market. You could get more information with its review from http://www.homecontrolhelp.com/2014/07/nest-protect-best-wifi-smoke-detector-co-monitor-for-iosandroid.html
Fire 3.5 is a forked version of Android 4.2.2. That means two things in particular: it won’t support the latest LE Bluetooth devices, and the device doesn’t have all of Google software, including most notably Maps. You will need to either depend on Amazon’s app store, which is frankly inferior to Google’s Play in terms of updates and number of apps, or I assume you can also sideload apps. I haven’t had a chance to use Fire 3.5 in person, so a lot of my assumptions are based on the Kindle Fire and early press. Since it is an Android based OS, it will obviously not run applications for iOS or Windows.