Espressif Systems ESP32 was introduced in 2016, and one of the key differences between ESP8266 and ESP32 was that the latter supported Bluetooth 4.2.
But since then, the Bluetooth Special Interest Group (SIG) released Bluetooth 5.0 (2016) with higher speeds and longer range, and Bluetooth 5.1 (2019)Â adding direction finding for indoor positioning applications. One would have thought that upgrading from Bluetooth 4.2 to Bluetooth 5.0/5.1 might have required a new radio, but apparently not.
As you can see from the above link and screenshot, ESP32 is now Bluetooth LE 5.0-Certified having passed SIG Bluetooth LE 5.0 certification.
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