Bluetooth printing using obex in uiq 3.0

i am implementing a printing using obex over bluetooth in uiq 3.0

i wanted to know the flow how it goes

i am using RHostResolver class and sockets

so the flows is

1st i need to search all the devices who support obex
HOW TO DO THAT? n i need the names and address of all the devices
so i can select through which device i can print

2nd DO I HAVE TO PAIR WITH THE DEVICE ALSO ?

in order to save the last device to which i communicated

3rd IS IT NECESSARY TO PAIR THE DEVICE BEFORE USING OBEX ?

4th IF anyone can help me with how to use obex basically i want to transfer only .jpeg files ?

please

thanks in adavance