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Bluedroid

Host stack supporting Bluetooth Classic and BLE; the default stack in ESP-IDF.

library also known as ESP-Bluedroid

Knowledge about Bluedroid

ESP32: use NimBLE for BLE-only products, Bluedroid only if you need Bluetooth Classicrecommendation · unverified · In ESP-IDF, ESP-NimBLE needs less memory (heap and flash) than ESP-Bluedroid but supports BLE only. Choose Bluedroid when you need Classic Bluetooth (e.g. A2DP, SPP).

Related

alternative to (from): NimBLE – BLE-only with smaller heap and flash use; Bluedroid is needed for Bluetooth Classic.