I have one question to "Bcast" in lesson 7 of tutorial. I set up one mote runing "Bcast.nc". As I inject a command "led_on" by BcastInject program, the mote with "Bcast.nc" light up yellow led and red led. In particular, lightening red led means the hop count is 2. But I can not understand why there is 2 hops in this case? Thanks