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Tangara is a portable, open-source music player based on an ESP32 MCU
(www.cnx-software.com)
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Okay, but in exchange you're carrying around a $250 device that is much large than the adapter? That was my point. And for many people, myself included, Bluetooth devices do decently well even if they have their drawbacks.
Fair enough. I guess my point is that a modern phone should have both Bluetooth AND a 3.5mm jack.