ANDROID WRITE THROUGT BLUETOOTH CONNECTION

we are looking for a small app with the following features : 1.- you have to show to the user the list of available bluetooth devices 2.- the user will select the device to write to 3.- the user will select a file located into the android device and you should open a stream and send it directly to the bluetooth port . what's the main purpose of the app ? We want to test several bluetooth printers . we will connect them to android devices (one each time ) . we will generate a file containning text data and scape codes for put the printer into different print modes (Bold, italic etc ) you only have to open the port and "vomit" the file we will prepare you .