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IOT device Bluetooth connection without pairing

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alpha91

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Hi, i am designing a system which require a Raspberry Pi to connect mobile phone nearby automatic. The mobile phone ID and bluetooth name is preset in Raspberry Pi.
The system need to avoid pairing manually. Rasberry Pi will scan devices nearby, once found the devices name that is matched with the name that saved in Pi, it will auto connect and wait for receiving data. Also the system require to connect multiple device at once if possible.
Base on my current research is that this require to preset the pairing device name into Raspberry Pi for connection in order to avoid pairing manually. And some info that i get is this require to use Bluetooth 4.x or smart bluetooth.
Is there anyone have more detail info on this that can guide me? If possible, let me know which bluetooth module should i get.
 

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