Looks like the latest software update from Amazon fixed the Miracast compatability issue on my FireTV Box, and now it's working as a wireless monitor. I'll have to check my FireTV stick tomorrow, see if it's gotten the latest software update yet.
Working on my Fire TV stick, mirroring my Surface Pro 3! My TV stick software version is 54.1.10_user_110035420.
Need to play around with the resolution later, as it didn't seem optimal.
Was smooth. Played some photo slideshow, then played Youtube videos.
After about 5 minutes, the video stopped casting but the audio continued.
After disconnecting, it failed when I tried connecting again. "Couldn't connect" says my Surface Pro 3. Will monitor the stability. One reason may be wifi, cos my SP3 was a bit slow connecting to pages after that.
I realize, the casting to the Fire TV Stick is via an existing Wifi rather than direct connection like the Microsoft Wireless Display Adapter? Anyone can confirm this?
The Miracast spec requires a WiFi direct connection between source (SP3) and sink (FireTV). In other words, it isn't using an existing WiFi connection, it is required by the spec to make a new peer-to-peer WiFi direct connection between the two devices.
One thing that could cause interference is if the WiFi direct connection uses the same WiFi band as your normal WiFi connection (both connections are active with Miracast, enabling the source (SP3) to stay connected to the internet). What might help is switching between a 2.4Ghz connection and a 5Ghz connection on your Surface.