Failed technology: Miracast
In 2012 it was nearly impossible to share content from your Android phone to a larger (TV) screen. Then, the WIFI alliance launched Miracast at CES 2013 and Google seemed to be backing it big time by baking it right into the Android OS.
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I was extremely excited about this “wireless HDMI technology” and ordered a NetGear PTV3000 (PTV = Push2TV) off of Amazon which promised to turn any HDMI capable screen into a Miracast ready receiver.
Out of the box, the Netgear could not be detected by my Galaxy Nexus phone. It took two firmware versions for the first pixels to stream over the Wifi Direct connection, yehaa! In practice however the phone had to be no more than 2 meters (6 ft) from the Netgear box to stream without horrible artefacts. My guess is the Wifi direct technology and antenne might not have been perfected.
Shortly after the Miracast hype subsided Google announced their first Chromecast dongle. The rest is history. Miracast was never backed by Apple either and today Miracast support is nowhere to be found in the latest Android (Pixel/Nexus) devices.
Miracast: https://en.wikipedia.org/wiki/Miracast
