def get_tiles(self, mtu_size):
'''
return the tiles containing the contiguous tiles fitting in mtu_size.
And, remaiing nb_tiles to be sent in all_tiles.
'''
remaining_size = mtu_size - schcmsg.get_sender_header_size(self.rule)
max_tiles = remaining_size // self.t_size
tiles = []
t_prev = None
for i in range(len(self.all_tiles)):
t = self.all_tiles[i]
'''
if t_prev and t_prev["t-num"] + 1 < t["t-num"]:
break
'''
if t["sent"] == False:
tiles.append(t)
t["sent"] = True
t_prev = t
if len(tiles) == max_tiles:
break
if len(tiles) == 0:
return None, 0, remaining_size
# return tiles and the remaining bits
nb_remaining_tiles = len(
[_ for _ in self.all_tiles if _["sent"] == False])
remaining_size -= self.get_tile_size(tiles)
return tiles, nb_remaining_tiles, remaining_size
def event_inactive(self):
""" event_inactive
// TODO : Redaction (here is schcrecv.py)
"""
#if the ack-ok was received, no ACK REQ will be received,
#check for state == "DONE" and return, this means that the ack-ok
#was send, before the system returns after sending the ack-ok, now it
#waits for one inactivity timer before closing session
if self.state == "DONE":
return
# sending sender abort.
schc_frag = schcmsg.frag_receiver_tx_abort(self.rule, self.dtag)
"""
Changement à corriger
args = (schc_frag.packet.get_content(), self.context["devL2Addr"])
"""
args = (schc_frag.packet.get_content(), '*')
print("Sent Receiver-Abort.", schc_frag.__dict__)
print("----------------------- SCHC RECEIVER ABORT SEND -----------------------")
if enable_statsct:
Statsct.set_msg_type("SCHC_RECEIVER_ABORT")
Statsct.set_header_size(schcmsg.get_sender_header_size(self.rule))
self.state = "ABORT"
self.protocol.scheduler.add_event(0,
self.protocol.layer2.send_packet, args)
# XXX needs to release all resources.
return
def set_packet(self, packet_bbuf):
super().set_packet(packet_bbuf)
# because draft-18 requires that in No-ACK mode, each fragment must
# contain exactly one tile and the tile size must be at least the size
# of an L2 Word.
min_size = (schcmsg.get_sender_header_size(self.rule) +
schcmsg.get_mic_size(self.rule) + self.rule["L2WordSize"])
if self.protocol.layer2.get_mtu_size() < min_size:
raise ValueError(
"the MTU={} is not enough to carry the SCHC fragment of No-ACK mode={}"
.format(self.protocol.layer2.get_mtu_size(), min_size))
def ack_timeout(self, *args):
self.cancel_ack_wait_timer()
print("----------------------- ACK timeout ----------------------- ")
self.state = self.ACK_TIMEOUT
assert len(args) == 2
assert isinstance(args[0], schcmsg.frag_sender_tx)
assert isinstance(args[1], int)
schc_frag = args[0]
win = args[1]
self.ack_requests_counter += 1
print("ack_requests_counter -> {}".format(self.ack_requests_counter))
if self.ack_requests_counter > max_ack_requests:
# sending sender abort.
schc_frag = schcmsg.frag_sender_tx_abort(self.rule, self.dtag, win)
""" Changement à corriger
args = (schc_frag.packet.get_content(), self.context["devL2Addr"])
"""
args = (schc_frag.packet.get_content(), "*")
print("MESSSAGE TYPE ----> Sent Sender-Abort.", schc_frag.__dict__)
if enable_statsct:
Statsct.set_msg_type("SCHC_SENDER_ABORT")
Statsct.set_header_size(
schcmsg.get_sender_header_size(self.rule))
self.protocol.scheduler.add_event(0,
self.protocol.layer2.send_packet,
args)
return
# set ack waiting timer
self.event_id_ack_wait_timer = self.protocol.scheduler.add_event(
self.ack_wait_timer, self.ack_timeout, args)
print("*******event id {}".format(self.event_id_ack_wait_timer))
schc_frag = schcmsg.frag_sender_ack_req(self.rule, self.dtag, win)
if enable_statsct:
Statsct.set_msg_type("SCHC_ACK_REQ")
# # retransmit MIC.
"""Changement à corriger
args = (schc_frag.packet.get_content(), self.context["devL2Addr"],
self.event_sent_frag)
"""
args = (schc_frag.packet.get_content(), '*', self.event_sent_frag)
print("MESSSAGE TYPE ----> SCHC ACK REQ frag:", schc_frag.__dict__)
self.protocol.scheduler.add_event(0, self.protocol.layer2.send_packet,
args)
""" waits for all the acks before sending the ack request
def send_frag(self):
print("{} send_frag!!!!!!!!!!!!!!!!!".format(utime.time()))
print("all1_send-> {}, resend -> {}, state -> {}".format(
self.all1_send, self.resend, self.state))
print("all tiles unsend -> {}".format(self.all_tiles))
for tile in self.all_tiles.get_all_tiles():
print("w: {}, t: {}, sent: {}".format(tile['w-num'], tile['t-num'],
tile['sent']))
if self.state == self.ACK_SUCCESS:
return
# if self.state == self.ACK_FAILURE and self.num_of_windows != 1 and self.number_of_ack_waits <= self.num_of_windows:
# #waiting for the acks of the others windows
# self.number_of_ack_waits += 1 #wait depends on the number of windows
# #set ack_time_out_timer
# print("waiting for more acks: {}".format(self.number_of_ack_waits))
# return
# get contiguous tiles as many as possible fit in MTU.
mtu_size = self.protocol.layer2.get_mtu_size()
window_tiles, nb_remaining_tiles, remaining_size = self.all_tiles.get_tiles(
mtu_size)
print("window tiles: {}, nb_remaining_tiles: {}, remaining_size: {}".
format(window_tiles, nb_remaining_tiles, remaining_size))
if window_tiles is None and self.resend:
print("no more tiles to resend")
#how to identify that all tiles are resend and that the ack timeout should be set
#to wait for tha last ok. It should be set after retransmission of the last fragment
if self.state == self.ACK_FAILURE and self.event_id_ack_wait_timer is None:
win = self.last_window_tiles[0][
"w-num"] if self.last_window_tiles[0][
"w-num"] is not None else 0
if self.last_window_tiles[0]["t-num"] == 0:
win += 1
schc_frag = schcmsg.frag_sender_tx(self.rule,
dtag=self.dtag,
win=win,
fcn=schcmsg.get_fcn_all_1(
self.rule),
mic=self.mic_sent)
#set ack waiting timer
args = (
schc_frag,
win,
)
self.event_id_ack_wait_timer = self.protocol.scheduler.add_event(
self.ack_wait_timer, self.ack_timeout, args)
print("*******event id {}".format(
self.event_id_ack_wait_timer))
# if self.all1_send and self.state == self.ACK_FAILURE:
# #case when with the bitmap is not possible to identify the missing tile,
# #resend ALL-1 messages
# # send a SCHC fragment
# args = (self.schc_all_1.packet.get_content(), self.context["devL2Addr"],
# self.event_sent_frag)
# print("frag sent:", self.schc_all_1.__dict__)
# if enable_statsct:
# Statsct.set_msg_type("SCHC_ALL_1")
# Statsct.set_header_size(schcmsg.get_sender_header_size(self.rule) +
# schcmsg.get_mic_size(self.rule))
# self.protocol.scheduler.add_event(0, self.protocol.layer2.send_packet,
# args)
# print("Sending all-1 beacuse there is an ACK FaILURE but cannot find the missing tiles")
# input("")
# win = self.last_window_tiles[0]["w-num"] if self.last_window_tiles[0]["w-num"] is not None else 0
# if self.last_window_tiles[0]["t-num"] == 0:
# win += 1
# schc_frag = schcmsg.frag_sender_tx(
# self.rule, dtag=self.dtag, win=win,
# fcn=schcmsg.get_fcn_all_1(self.rule),
# mic=self.mic_sent)
# set ack waiting timer
#args = (schc_frag, win,)
#self.event_id_ack_wait_timer = self.protocol.scheduler.add_event(
# self.ack_wait_timer, self.ack_timeout, args)
#print("*******event id {}".format(self.event_id_ack_wait_timer))
#if window_tiles is not None and not self.all1_send and not self.resend:
if window_tiles is not None:
print("window_tiles is not None -> {}, resend -> {}".format(
self.all1_send, self.resend))
# even when mic is sent, it comes here in the retransmission.
if self.all1_send and self.state != self.ACK_FAILURE:
#when there is a retransmission, the all-1 is send again and is send before
#the ACK-OK is received. One option is not set the timer after the last
#retransmission, but i don´t know how to idenfy that all missing fragments
#have been send. Also the ALL-1 is not retransmisted (dont know if this should
# be like this. For example, if the ALL-1s is lost, the receiver timer expires
# and a receiver abort is send. If it arrives, there is not need to retransmit
# the message after the retransmission of the missing fragments)
#FIX, all-1 is resend
print('All-1 ones already send')
#cancel timer when there is success
# if self.event_id_ack_wait_timer and self.state == self.ACK_SUCCESS:
# self.cancel_ack_wait_timer()
#else:
# print("how to add a timer without sending a message")
# fcn = schcmsg.get_fcn_all_1(self.rule)
# args = (schc_frag, window_tiles[0]["w-num"],)
# elf.event_id_ack_wait_timer = self.protocol.scheduler.add_event(
# self.ack_wait_timer, self.ack_timeout, args)
#fcn = schcmsg.get_fcn_all_1(self.rule)
return
elif (nb_remaining_tiles == 0 and len(window_tiles) == 1
and remaining_size >= schcmsg.get_mic_size(self.rule)):
print("ALL-1 prepared")
# make the All-1 frag with this tile.
# the All-1 fragment can carry only one tile of which the size
# is less than L2 word size.
fcn = schcmsg.get_fcn_all_1(self.rule)
last_frag_base_size = (
schcmsg.get_sender_header_size(self.rule) +
schcmsg.get_mic_size(self.rule) +
TileList.get_tile_size(window_tiles))
#check if mic exists, no need no created again
if self.mic_sent is None:
mic = self.get_mic(self.mic_base, last_frag_base_size)
# store the mic in order to know all-1 has been sent.
self.mic_sent = mic
else:
mic = self.mic_sent
print("mic_sent -> {}".format(self.mic_sent))
if enable_statsct:
Statsct.set_msg_type("SCHC_ALL_1")
Statsct.set_header_size(
schcmsg.get_sender_header_size(self.rule) +
schcmsg.get_mic_size(self.rule))
self.all1_send = True
self.state = self.SEND_ALL_1
else:
print("regular SCHC frag")
# regular fragment.
fcn = window_tiles[0]["t-num"]
mic = None
if enable_statsct:
Statsct.set_msg_type("SCHC_FRAG")
Statsct.set_header_size(
schcmsg.get_sender_header_size(self.rule))
schc_frag = schcmsg.frag_sender_tx(
self.rule,
dtag=self.dtag,
win=window_tiles[0]["w-num"],
fcn=fcn,
mic=mic,
payload=TileList.concat(window_tiles))
if mic is not None:
print("mic is not None")
# set ack waiting timer
#if enable_statsct:
# Statsct.set_msg_type("SCHC_FRAG")
# Statsct.set_header_size(schcmsg.get_sender_header_size(self.rule))
args = (
schc_frag,
window_tiles[0]["w-num"],
)
print("all ones")
self.schc_all_1 = schc_frag
self.event_id_ack_wait_timer = self.protocol.scheduler.add_event(
self.ack_wait_timer, self.ack_timeout, args)
print("*******event id {}".format(
self.event_id_ack_wait_timer))
# save the last window tiles.
self.last_window_tiles = window_tiles
print("self.last_window_tiles -> {}".format(
self.last_window_tiles))
elif self.mic_sent is not None or self.all1_send:
print("self.mic_sent is not None state -> {}".format(self.state))
# it looks that all fragments have been sent.
print(
"----------------------- all tiles have been sent -----------------------",
window_tiles, nb_remaining_tiles, remaining_size)
schc_frag = None
self.all1_send = True
if self.event_id_ack_wait_timer and self.state == self.ACK_SUCCESS:
self.cancel_ack_wait_timer()
return
else:
print("only mic all tiles send")
# Here, only MIC will be sent since all tiles has been sent.
assert self.last_window_tiles is not None
# As the MTU would be changed anytime AND the size of the
# significant padding bits would be changed, therefore the MIC
# calculation may be needed again.
# XXX maybe it's better to check whether the size of MTU is change
# or not when the previous MIC was calculated..
last_frag_base_size = (
schcmsg.get_sender_header_size(self.rule) +
TileList.get_tile_size(self.last_window_tiles))
self.mic_sent = self.get_mic(self.mic_base, last_frag_base_size)
# check the win number.
# XXX if the last tile number is zero, here window number has to be
# incremented.
win = self.last_window_tiles[0]["w-num"]
if self.last_window_tiles[0]["t-num"] == 0:
win += 1
schc_frag = schcmsg.frag_sender_tx(self.rule,
dtag=self.dtag,
win=win,
fcn=schcmsg.get_fcn_all_1(
self.rule),
mic=self.mic_sent)
# set ack waiting timer
args = (
schc_frag,
win,
)
if enable_statsct:
Statsct.set_msg_type("SCHC_ALL_1")
Statsct.set_header_size(
schcmsg.get_sender_header_size(self.rule) +
schcmsg.get_mic_size(self.rule))
self.schc_all_1 = schc_frag
self.event_id_ack_wait_timer = self.protocol.scheduler.add_event(
self.ack_wait_timer, self.ack_timeout, args)
print("*******event id {}".format(self.event_id_ack_wait_timer))
# send a SCHC fragment
args = (schc_frag.packet.get_content(), self.context["devL2Addr"],
self.event_sent_frag)
print("frag sent:", schc_frag.__dict__)
self.protocol.scheduler.add_event(0, self.protocol.layer2.send_packet,
args)
def send_frag(self):
# XXX
# because No-ACK mode supports variable MTU,
# sender can't know the fact that it can't send all fragments
# before it reachs to send the last fragment (All-1).
#
# The All-1 fragment MUST be formed like below.
#
# | header | MIC | last tile |
# |<- L2 word size ->|
# |<- L2 Word
#
# if the size of header+MIC+tile doesn't fit the L2 Word,
#
# | header | MIC | last tile | padding |
# |<- L2 word size ->|<- less than ->|
# L2 word size
# |<- L2 Word
payload_size = (self.protocol.layer2.get_mtu_size() -
schcmsg.get_sender_header_size(self.rule))
remaining_data_size = self.packet_bbuf.count_remaining_bits()
if remaining_data_size >= payload_size:
# put remaining_size of bits of packet into the tile.
tile = self.packet_bbuf.get_bits_as_buffer(payload_size)
transmit_callback = self.event_sent_frag
fcn = 0
self.mic_sent = None
if enable_statsct:
Statsct.set_msg_type("SCHC_FRAG")
Statsct.set_header_size(
schcmsg.get_sender_header_size(self.rule))
elif remaining_data_size < payload_size:
if remaining_data_size <= (payload_size -
schcmsg.get_mic_size(self.rule)):
tile = None
if remaining_data_size > 0:
tile = self.packet_bbuf.get_bits_as_buffer()
# make All-1 frag.
assert self.mic_sent is None
last_frag_base_size = 0
if tile is not None:
last_frag_base_size += (
schcmsg.get_sender_header_size(self.rule) +
schcmsg.get_mic_size(self.rule) + remaining_data_size)
self.mic_sent = self.get_mic(self.mic_base,
last_frag_base_size)
# callback doesn't need in No-ACK mode.
transmit_callback = None
fcn = schcmsg.get_fcn_all_1(self.rule)
if enable_statsct:
Statsct.set_msg_type("SCHC_ALL_1")
Statsct.set_header_size(
schcmsg.get_sender_header_size(self.rule) +
schcmsg.get_mic_size(self.rule))
else:
# put the size of the complements of the header to L2 Word.
tile_size = (remaining_data_size -
(schcmsg.get_sender_header_size(self.rule) +
remaining_data_size) % self.rule["L2WordSize"])
tile = self.packet_bbuf.get_bits_as_buffer(tile_size)
transmit_callback = self.event_sent_frag
fcn = 0
self.mic_sent = None
if enable_statsct:
Statsct.set_msg_type("SCHC_FRAG")
Statsct.set_header_size(
schcmsg.get_sender_header_size(self.rule))
schc_frag = schcmsg.frag_sender_tx(self.rule,
dtag=self.dtag,
win=None,
fcn=fcn,
mic=self.mic_sent,
payload=tile)
# send a SCHC fragment
args = (schc_frag.packet.get_content(), self.context["devL2Addr"],
transmit_callback)
print("frag sent:", schc_frag.__dict__)
self.protocol.scheduler.add_event(0, self.protocol.layer2.send_packet,
args)
def send_frag(self):
# get contiguous tiles as many as possible fit in MTU.
mtu_size = self.protocol.layer2.get_mtu_size()
window_tiles, nb_remaining_tiles, remaining_size = self.all_tiles.get_tiles(
mtu_size)
#print('**********window_tiles: ', window_tiles)
#print('**********nb_remaining_tiles: ', nb_remaining_tiles)
#print('**********remaining_size: ', remaining_size)
if window_tiles is not None:
# even when mic is sent, it comes here in the retransmission.
if (nb_remaining_tiles == 0 and len(window_tiles) == 1
and remaining_size >= schcmsg.get_mic_size(self.rule)):
#make the All-1 frag with this tile.
# the All-1 fragment can carry only one tile of which the size
# is less than L2 word size.
fcn = schcmsg.get_fcn_all_1(self.rule)
last_frag_base_size = (
schcmsg.get_sender_header_size(self.rule) +
schcmsg.get_mic_size(self.rule) +
TileList.get_tile_size(window_tiles))
mic = self.get_mic(self.mic_base, last_frag_base_size)
# store the mic in order to know all-1 has been sent.
self.mic_sent = mic
else:
# regular fragment.
fcn = window_tiles[0]["t-num"]
mic = None
schc_frag = schcmsg.frag_sender_tx(
self.rule,
dtag=self.dtag,
win=window_tiles[0]["w-num"],
fcn=fcn,
mic=mic,
payload=TileList.concat(window_tiles))
if mic is not None:
# set ack waiting timer
args = (
schc_frag,
window_tiles[0]["w-num"],
)
self.event_id_ack_wait_timer = self.protocol.scheduler.add_event(
self.ack_wait_timer, self.ack_timeout, args)
# save the last window tiles.
self.last_window_tiles = window_tiles
elif self.mic_sent is not None:
# it looks that all fragments have been sent.
print("xxx looks all tiles have been sent.", window_tiles,
nb_remaining_tiles, remaining_size)
schc_frag = None
return
else:
# Here, only MIC will be sent since all tiles has been sent.
assert self.last_window_tiles is not None
# As the MTU would be changed anytime AND the size of the
# significant padding bits would be changed, therefore the MIC
# calculation may be needed again.
# XXX maybe it's better to check whether the size of MTU is change
# or not when the previous MIC was calculated..
last_frag_base_size = (
schcmsg.get_sender_header_size(self.rule) +
TileList.get_tile_size(self.last_window_tiles))
self.mic_sent = self.get_mic(self.mic_base, last_frag_base_size)
# check the win number.
# XXX if the last tile number is zero, here window number has to be
# incremented.
win = self.last_window_tiles[0]["w-num"]
if self.last_window_tiles[0]["t-num"] == 0:
win += 1
schc_frag = schcmsg.frag_sender_tx(self.rule,
dtag=self.dtag,
win=win,
fcn=schcmsg.get_fcn_all_1(
self.rule),
mic=self.mic_sent)
# set ack waiting timer
args = (
schc_frag,
win,
)
self.event_id_ack_wait_timer = self.protocol.scheduler.add_event(
self.ack_wait_timer, self.ack_timeout, args)
# send a SCHC fragment
args = (schc_frag.packet.get_content(), self.protocol.layer2.mac_id,
None, self.event_sent_frag, True)
print("frag sent:", schc_frag.__dict__)
self.protocol.scheduler.add_event(0, self.protocol.layer2.send_packet,
args)
