Algorithm 1 Wi-SUN FAN discovery process on JS1

1:C: number of available channels 2:$V\left[\right]$← channel_function() 3:$I_c$: channel index 4:$UDI$: unicast dwell interval 5:$I_c$← 0 6:node = JS1 7:start of PAS trickle timer 8:$CHscan\leftarrow V\left[I_c\right]$ 9:while node is in the process of connecting do 10:    if $UDI$ timer has expired then 11:        resets the scan time 12:        $I_c\leftarrow (I_c+1)$ 13:        $CHscan\leftarrow V\left[I_c\right]$ 14:    end if 15:    if node = JS1 then 16:        node is not associated 17:        transmits PAS when the trickle timer allows 18:        if PA is received then 19:           stop of PAS trickle timer 20:           node ← JS5 21:        end if 22:    end if 23:    if node = JS5 then 24:        node is associated 25:        start of PA trickle timer 26:    end if 27:end while