How to use open source trackers to make chat program?

Question

Hi,

I want to create chat program as I explain below:

 

                                                           

                                   Tracker 1 ( php open source tracker) 

 

 

 

                       

 

 

 

 

       Computer 1                                                                                   computer 2

 

First, I want to make communication between these computers which are behind network address translation (NAT) so I need to connect the computers to to trackers and patch the data(port, ID, MAC) of each computer to tracker .

Next, the data of computer must be sent to the next computer .and vice versa , 

then, the computer behind NAT make a point to point connection and by a chat platform the connection get created and the computers send and receive the chats.

Thank you.