Espressif's flagship chip, the ESP32, has recently passed SIG Bluetooth LE 5.0 certification. This affirms that the protocol version supported by the ESP32 microcontroller has been upgraded from Bluetooth LE 4.2 to Bluetooth LE 5.0, which has higher stability and compatibility.
Implementing and developing Bluetooth LE applications requires not only a chip that supports this function, but also the accompanying Bluetooth LE protocol stack, which consists of the controller and the host:
• Controller: Defines the specifications of such hardware as RF and baseband.
• Host: The Logical Link Control and Adaptation Layer Protocol (L2CAP) provides data encapsulation services to the upper layers, allowing for logical end-to-end communication of data.
With the Bluetooth LE 5.0 certification, the ESP32 SoC has also added new features which have not only upgraded the chip as a whole, but have also strengthened its latest software, after passing a greater number of strict tests since the previous certification.
ESP32 customers can use the Bluetooth LE host protocol stack in ESP-IDF, which supports two sorts of Bluetooth LE hosts:
• NimBLE Host (Bluetooth LE 5.1-certified).
• Bluedroid Host (soon to be certified by Bluetooth LE 5.0).
Due to hardware limitations, ESP32 does not support such functions of Bluetooth LE 5.0 as 2M PHY, LE Long Range, and ADV Extensions.
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