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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1Note: WeDo 2.0 is similar, but not the same. The official WeDo 2.0 SDK can be found at education.lego.com/en-us/support/wedo-2/developer-kits. Commented Dec 21, 2018 at 18:29
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1It is too bad that this is the only thing LEGO has on github.– chicksCommented Dec 22, 2018 at 23:50
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check this repositories also github.com/cpseager?tab=repositories - he have few nodejs/python bindings, protocols descriptions and so on– x'ESCommented Jul 27, 2020 at 0:00