def send_payload():
"""Schedules CCA after 60 seconds to send packet."""
current_time = global_vars.EVENT_LIST[1][0]
#origin mote
origin_mote_row = int( global_vars.EVENT_LIST[2][0].split(';')[1] )
origin_mote_col = int( global_vars.EVENT_LIST[2][0].split(';')[2] )
#parent mote
if global_vars.MOTES_ARRAY[origin_mote_row][origin_mote_col].gateway == False:
#mote is NOT the gateway of cloud A
parent_mote_row = int( global_vars.MOTES_ARRAY[origin_mote_row][origin_mote_col].parent.split(';')[1] )
parent_mote_col = int( global_vars.MOTES_ARRAY[origin_mote_row][origin_mote_col].parent.split(';')[2] )
global_vars.MOTES_ARRAY[parent_mote_row][parent_mote_col].packets_received += 1
#schedule packet forwarding
global_vars.EVENT_LIST[0].append(9)
global_vars.EVENT_LIST[1].append(current_time + functions.calculate_transmission_delay(4))
global_vars.EVENT_LIST[2].append(global_vars.MOTES_ARRAY[parent_mote_row][parent_mote_col].moteID)
elif global_vars.MOTES_ARRAY[origin_mote_row][origin_mote_col].gateway == True:
#mote is the gateway of cloud A
global_vars.NODES_ARRAY[0].packets_received += 1 #send packet to node directly
global_vars.MOTES_ARRAY[origin_mote_row][origin_mote_col].packets_sent += 1
global_vars.EVENT_LIST[0].append(0)
global_vars.EVENT_LIST[1].append(current_time + 60)
global_vars.EVENT_LIST[2].append(global_vars.EVENT_LIST[2][0])
return
def cca():
"""The mote checks if the channel is clear to send data.
This operation lasts 0.000128 seconds.
If the channel is clear after 0.000128 seconds, mote will schedule to send it's packets
and update the channel release time.
Otherwise random delay will be performed and the CCA again."""
current_time = global_vars.EVENT_LIST[1][0]
if (current_time + global_vars.CCA_TIME) > global_vars.CHANNEL_ARRAY[0].release_time:
#channel is released by that time
#mote takes the channel
global_vars.EVENT_LIST[1].append(current_time + global_vars.CCA_TIME)
global_vars.EVENT_LIST[2].append(global_vars.EVENT_LIST[2][0])
mote_row = int( global_vars.EVENT_LIST[2][0].split(';')[1] )
mote_col = int( global_vars.EVENT_LIST[2][0].split(';')[2] )
if global_vars.MOTES_ARRAY[ mote_row ][ mote_col ].payload == True:
#mote has payload ready
#Updates the channel release time according to the time it takes to transmit 4 Bytes
global_vars.CHANNEL_ARRAY[0].release_time = current_time + global_vars.CCA_TIME + functions.calculate_transmission_delay(4)
#schedule the send package event
global_vars.EVENT_LIST[0].append(3)
elif global_vars.MOTES_ARRAY[ mote_row ][ mote_col ].echo == True:
#mote has echo ready
#Updates the channel release time according to the time it takes to transmit 1 Byte
global_vars.CHANNEL_ARRAY[0].release_time = current_time + global_vars.CCA_TIME + functions.calculate_transmission_delay(1)
global_vars.EVENT_LIST[0].append(2) #schedule echo event
else:
#channel will not be free
#schedule cca again after random time
global_vars.EVENT_LIST[0].append(0)
global_vars.EVENT_LIST[1].append(current_time + global_vars.CCA_TIME) #reschedule after you perform CCA
global_vars.EVENT_LIST[2].append(global_vars.EVENT_LIST[2][0])
return
def forward_payload():
current_time = global_vars.EVENT_LIST[1][0]
try:
if (current_time + global_vars.CCA_TIME) > global_vars.CHANNEL_ARRAY[0].release_time:
#channel is released by that time
#mote takes the channel
#Updates the channel release time according to the time it takes to transmit 4 Bytes
global_vars.CHANNEL_ARRAY[0].release_time = current_time + global_vars.CCA_TIME + functions.calculate_transmission_delay(4)
#add packet sent by child
origin_mote_row = int( global_vars.EVENT_LIST[2][0].split(';')[1] )
origin_mote_col = int( global_vars.EVENT_LIST[2][0].split(';')[2] )
global_vars.MOTES_ARRAY[ origin_mote_row ][ origin_mote_col ].packets_sent += 1
#add packet received to parent
parent_mote_row = int( global_vars.MOTES_ARRAY[origin_mote_row][origin_mote_col].parent.split(';')[1] )
parent_mote_col = int( global_vars.MOTES_ARRAY[origin_mote_row][origin_mote_col].parent.split(';')[2] )
global_vars.MOTES_ARRAY[ parent_mote_row ][ parent_mote_col ].packets_received += 1
else:
#channel will not be free
#schedule cca again after random time
global_vars.EVENT_LIST[0].append(9)
global_vars.EVENT_LIST[1].append(current_time + global_vars.CCA_TIME) #reschedule after you perform CCA
global_vars.EVENT_LIST[2].append(global_vars.EVENT_LIST[2][0])
except:
#in case the parent is the node
#maybe I have not seen this happening
#temporary fix
pass
return