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Finally found a way. rfcomm watch hci0 allowed me to keep the connection and send data through my app.
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Scanning for devices is a core feature of Bluetooth Low-Energy.
For Linux, the official protocol stack for Bluetooth is BlueZ, and many tools and services will derive their functionality from it. I mention this because, while there are plenty of software-specific tools available (like noble for Node.js, or bluepy for Python), they are essentially adapters ...
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