Where can I find the source code for the Demo Android Apps, such as the "BlueNRG" app or "STM32 BLE Profiles" app.
the source code for the apps that you mentioned is not available. Anyway, on GitHub you can find our general purpose Software Development Kit, called BlueST SDK, that can be used as a starting point for smartphone app development. It is a multi-platform library (Android and iOS supported) that permits easy access to the data exported by Bluetooth Low Energy (BLE) devices.
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