This version broadcasts to only to 255.255.255.255 on all interfaces.  Debug info in Info window. Be sure it is open.

t represents the time the  set of broadcasts took in microseconds.

It also displays received broadcasts by showing the ip address of the sender. e.g.

11:08:08 Broadcast received from: 192.168.1.38 11:08:10 172.22.96.1 - 255.255.255.255 11:08:10 192.168.1.37 - 255.255.255.255 11:08:10 25.26.236.91 - 255.255.255.255 11:08:10 t = 996