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DX-BT16 4.2 Bluetooth serial port through BLE4.0 BQB certification support iOS Android wireless module for arduino - AliExpress
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sunhokey bt12 Dual-Mode Serial Port ble4.0 +2.0 for iOS Android Wireless Bluetooth Module : Amazon.in: Computers & Accessories
GitHub - WirecardMobileServices/Android-BluetoothSPPLibrary: Bluetooth Serial Port Profile which comfortable to developer application to communication with microcontroller via bluetooth
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