[ns] What does member function "getMac" of Node/MobileNode mean ?

[Su Jinzhao]

Hi, all.

       I noticed that there is a "getMac" function while creating and
initializing wireless node, like the following code block:


for {set i 0} {$i < $opt(nn) } {incr i} {
                  set node_($i) [$ns_ node]
                  $node_($i) random-motion 0              ;# disable
random motion
                set mac_($i) [$node_($i) getMac 0]

                $mac_($i) set dataRate_ 54Mb
                $mac_($i) set basicRate_ 24Mb
                $mac_($i) set RTSThreshold_ 3000

                $node_($i) set X_ 0.0
                $node_($i) set Y_ 0.0
                $node_($i) set Z_ 0.0
      }

and I looked up the function definition in ns-mobilenode.tcl file:

Node/MobileNode instproc getMac {param0} {
       $self instvar mac_
       return $mac_($param0)
 }

This seems nothing strange, so I want to know what's the purpose of command
"set mac_($i) [$node_($i) getMac 0]", I think that we should not set all
nodes mac address to be zero.

Thanks, any suggestions will be appreciated.
-- 
Su Jinzhao(苏金钊)