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Portable BLE by Design: The Bluetooth Rewrite in Arduino ESP32 v4.0 · Developer Portal #843
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Portable BLE by Design: The Bluetooth Rewrite in Arduino ESP32 v4.0 · Developer Portal
The Arduino core v4.0 overhauls its Bluetooth libraries with modernized, safer codebases: the BLE library gains a unified API across NimBLE and Bluedroid with Bluetooth 5 enabled by default, while BluetoothSerial adds multi-peer support. Here is what changed and how to migrate from v3.3.12 to v4.0.0-RC1.
https://developer.espressif.com/blog/2026/10/arduino-bluetooth-refactor/
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