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LEGO BOOST and LEGO Powered Up Smart Hubs use Bluetooth Low Energy to communicate to apps. Where can I find documentation on the communication protocol so that I can build my own app for these devices?

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LEGO calls this communication protocol the "LEGO Wireless Protocol" (LWP). The documentation is publicly available at https://lego.github.io/lego-ble-wireless-protocol-docs/.

There is also a GitHub repository that provides the source of this website at https://github.com/LEGO/lego-ble-wireless-protocol-docs. Because of this, it seems reasonable to expect this documentation to evolve over time.

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