I have done a little bit of research and I want to confirm what I need in order to control my TV/Stereo via the Echo/SmartThings/Harmony. I am pretty sure that I just need the Harmony Home Hub, which appears to sell for about $99.
Biut, I also see the Logitech - Harmony Home Hub Extender - Black, which says,
‘For use with Harmony Home Hub; compatible with ZigBee, Z-Wave and Z-Wave Plus products; Apple® iOS and Android mobile connectivity; USB powered’.
What do I need for voice control thru Echo/SmartThings/Harmony?