Logitech has released an update to their Harmony line of remotes and smartphone apps which adds the ability to control the Amazon Fire TV.  The update covers the Harmony Smart remote, Harmony Ultimate remote, the Harmony Android app, and the Harmony iOS app. With this update, both the remotes and app can now control the Fire TV via Bluetooth. However, neither the remotes nor the app can trigger the Fire TV’s built-in voice search. Instead, Logitech has added their own voice search to their app. The app is capable of acting as a keyboard for the Fire TV. Voice search queries done with the app will be relayed to the Fire TV as keyboard input. The update is already live for the remotes and Android app. The iOS update should come soon.

SourceLogitech Blog