tag---------------station---------------station---------------PC---------------Server -------------------->

• tag's time

• tag's id

              <-------------------> 
              - active tags list
              - active station list
              - tag's time
              - tag's id
              - tag's signal strength
  
                                    <------------------->
                                     - active tags list
                                     - active station list
                                     - tag's id
                                     - tag's time
                                     - tag's signal strength
                                     - station's id
  
                                                         ------------------->
                                                         - <all information PC has>
                                                         - PC's id
  
                                                         <-------------------
                                                         - tag's id
                                                         - tag's position