Algorithm 2: Data transmission

1: procedure Data forwarding after multicast WuPt (SINK, FN, REL, DST) 2:    if WuPt is received then 3:        bit-wise check of WuPt address 4:        if cluster-bit and ID-bit = = own cluster-bit and ID-bit then 5:           wake-up sensor node and switch to receive mode 6:           if receiving request from FN then 7:               check source route table 8:               if next hop != FN then 9:                   check source route table and send DataPt to REL 10:               else send Data to FN and go to sleep mode 11:               end procedure. 12:           else receive DataPt and check source route table 13:               if next hop != FN then 14:                   check source route table and send DataPt to REL 15:               else send Data to FN and go to sleep mode 16:        else go to sleep mode