Bluetooth device

I would like to create an app in order to get data from a bluetooth device.
For the moment I do not have the technical information concerning the data but I would like to start building something.
Do you know how I can simulate a bluetooth device when I am developping my app ?
do you have any examples of apps ?

thanks for you help.

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Download a Bluetooth serial app on another smartphone and use it to send data on your app.