bluetooth full control

I want to have a program that can : 1- send and receive files from mobile phone (bluetooth included) 2- the program at startup in a waiting mode for receiving a file 3- accept files from only trusted devices (it's name is stored in program database and? are paired by a password at only first time that they make a connection between each other) i.e when the trusted? mobile sends to the computer a file , the program automatically receive the file without asking any password [as it is required at the first time only] 4-when the program receive a file , it puts it in a certain folder (specified in the program code and not optional to the user) , and after that? If the file have the extension .txt , the program read the data from the file and display it in? a text box in the program form