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main.py
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main.py
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from network import LoRa
import socket
import time
import pycom
from machine import Timer
import crypto
from network import WLAN
from network import Bluetooth
import machine
import ustruct, ubinascii, uhashlib
from lib.varlogger import VarLogger as vl
import _thread
import gc
import sys
import utime
import ustruct
'''
Implemented of LoPy4/Fipy with 1.18 pycom-micropython version
'''
######### Utility Functions #######################
def get_node_id(hex=False):
"""
Get node id, which consists of four bytes unsigned int.
Return as hex, according to parameter.
"""
node_id = ubinascii.hexlify(uhashlib.sha1(
machine.unique_id()).digest()).decode("utf-8")[-8:]
if hex:
return node_id
else:
return int(node_id, 16)
######### Initialize the device #######################
lora = LoRa(mode=LoRa.LORA, power_mode=LoRa.ALWAYS_ON, region=LoRa.EU868)
s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
s.setblocking(False)
pycom.heartbeat(False)
wlan = WLAN()
wlan.deinit()
bluetooth = Bluetooth()
bluetooth.deinit()
######### Own node's information #####################
if get_node_id() == 235968217:
my_number = 1
source_address = 'Mac' + str(my_number)
print('I am node Mac1')
elif get_node_id() == 829745241:
my_number = 2
source_address = 'Mac' + str(my_number)
print('I am node Mac2')
elif get_node_id() == 50989579:
my_number = 3
source_address = 'Mac' + str(my_number)
print('I am node Mac3')
number_of_neighbours = 2
######### Initialize the timers #######################
chrono = Timer.Chrono()
chrono1 = Timer.Chrono()
chrono2 = Timer.Chrono()
chrono3 = Timer.Chrono()
############ Configurable Parameters #################
wakeup_interval = 20
fast_sleep_threshold = 2.5
transmission_type = 'Unicast' #Unicast or Broadcast
num_of_packets = 10
pll_threshold = 7
cca_duration = 0.08
cca_interval = 0.4
rssi_threshold = 100
packet_size = 255 # bytes
############ Configuring the device ####################
packet_number = 1
transmissions = 0
alive_time = 0
phase_lock_time_saving = 0
saved_transmissions = 0
failed_attempts = 0
phase_lock_cca_fails = 0
Awake_instance = 1
broadcast_time_save = 0
fast_sleep_time_save = 0
Full_send_time = 0
Tx_time = 0
Rx_time = 0
ack = False
only_listen = False
noise_detected_counter = 0
ack_data_packets = []
cca_list = []
received_time = []
received_full_data = []
phase_lock_optimization = {}
phase_lock_optimization_time = {}
max_wait_time = 1 * wakeup_interval
lora_off_time = 0.6
packet_gap_interval = 1
pll_activation = 2.0
sleep_in_pll = 1.9
transmission_in_pll = 1.8
############## Delay to avoid CCA overlap ############
number2 = (wakeup_interval - 2) / 10
print((my_number - 1) * number2)
time.sleep((my_number - 1) * number2)
############## Random number generation ################
def Random():
r = crypto.getrandbits(32)
return ((r[0] << 24) + (r[1] << 16) + (r[2] << 8) + r[3]) / 4294967295.0
def RandomRange(rfrom, rto):
return Random() * (rto - rfrom) + rfrom
############## Random packet generation ################
def packet_check(packet_status, s=Awake_instance, g=packet_number):
if not packet_status:
total_nodes = number_of_neighbours+1
number = (Awake_instance % total_nodes) - my_number
if packet_number < num_of_packets and (number == 0 or number == -total_nodes):
return True
else:
return False
else:
return packet_status
############## Clear Channel Assessment ################
def cca(x=packet_gap_interval, f=lora_off_time, c=cca_list, d=chrono, l=lora, h=cca_duration, m=rssi_threshold, n=cca_interval):
print('Checking Channel')
chrono1.start()
while chrono1.read() < cca_duration:
c.append(str(lora.ischannel_free(-rssi_threshold)))
# print('RSSI during CCA {}'.format (lora.stats()[1]))
chrono1.stop()
chrono1.reset()
chrono.stop()
# print('cca list', c)
if 'False' in cca_list:
return False
else:
chrono1.start()
while chrono1.read() < cca_interval:
l = LoRa(power_mode=LoRa.SLEEP, region=LoRa.EU868)
l = LoRa(power_mode=LoRa.ALWAYS_ON, region=LoRa.EU868)
chrono1.stop()
chrono1.reset()
chrono.start()
chrono1.start()
while chrono1.read() < cca_duration:
c.append(str(lora.ischannel_free(-rssi_threshold)))
# print('RSSI during CCA {}'.format (lora.stats()[1]))
chrono1.stop()
chrono1.reset()
if 'False' in cca_list:
return False
else:
return True
############# Neighbor Discovery #########################
neighbour_discover = False
neighbor_adresses = []
while not neighbour_discover:
print('Discovering Neighbours')
number = int(RandomRange(1, 4))
print(number, my_number)
if number != my_number:
neighbor = 'Mac' + str(number)
print('Neighbor Mac{} added to the list'.format(neighbor))
if neighbor not in neighbor_adresses:
neighbor_adresses.append(neighbor)
if len(neighbor_adresses) == number_of_neighbours:
break
# time.sleep(1)
print('Neighbour Addresses:', neighbor_adresses)
Broadcast_address = 'All'
neighbor = 0
###### for testing purposes ######
gc_start_time = utime.ticks_ms()
gc.collect()
print('gc.collect duration:', utime.ticks_ms()-gc_start_time)
###### for testing purposes ######
##### for testing purposes ######
testing_start = vl.created_timestamp
##### for testing purposes ######
print('Initialising Contiki MAC')
packet_status = False
############# Contiki MAC #########################
while True:
try:
##### for testing purposes ######
print('Time since started:', utime.ticks_ms()- testing_start - vl.time_to_write )
##### for testing purposes ######
chrono.start()
chrono3.start()
channel_status = cca(chrono, cca_list)
packet_status = packet_check(packet_status, Awake_instance, packet_number)
lora = LoRa(power_mode=LoRa.ALWAYS_ON, region=LoRa.EU868)
while len(s.recv(packet_size)) > 0:
ss = s.recv(packet_size)
events = lora.events()
print('Channel Status:', channel_status)
print('Packet Status:', packet_status)
if channel_status and packet_status and not only_listen:
########### Transmit Data ##########################
lora = LoRa(power_mode=LoRa.ALWAYS_ON, region=LoRa.EU868)
print('Sending Data')
send_time = 0
data = 'Data'
cca_time = chrono.read()
cca_list.clear()
if transmission_type == 'Unicast':
########### Unicast Transmission ##########################
send_time_updated = False
if ack:
neighbor += 1
if neighbor >= len(neighbor_adresses):
neighbor = 0
destination_address = neighbor_adresses[neighbor]
safe_time = packet_gap_interval + 0.2
channel_checked = True
ack = False
Phase_Lock_channel_check = False
phase_lock_transmissions = 0
############ Condition to use PLL implementation
if destination_address in phase_lock_optimization_time and float(phase_lock_optimization_time.get(destination_address)) >= pll_activation:
########### PLL optimization ##########################
while float(phase_lock_optimization_time.get(destination_address)) - sleep_in_pll > chrono.read():
lora = LoRa(power_mode=LoRa.SLEEP, region=LoRa.EU868)
while not ack and chrono.read() < max_wait_time:
if float(phase_lock_optimization_time.get(destination_address)) - transmission_in_pll <= chrono.read() and phase_lock_transmissions < pll_threshold:
########### Transmission with PLL ##########################
if channel_checked:
phase_lock_time_saving = phase_lock_time_saving + chrono.read() - cca_time
channel_checked = False
lora = LoRa(power_mode=LoRa.ALWAYS_ON, region=LoRa.EU868)
if cca():
########### Channel is free and transmission with PLL starts ##########################
packet1 = ustruct.pack('!15s', source_address + ' ' + ' ' + destination_address + ' ' + data)
packet1 += ustruct.pack('!B', packet_number) + ' ' + ustruct.pack('!B', send_time) + ' ' + ustruct.pack('!f',round(chrono.read(),2)) + ' '
padding = packet_size - len(packet1)
zero_padding = '0' * padding
packet = packet1 + zero_padding
s.send(packet)
transmissions += 1
phase_lock_transmissions += 1
print(packet1[:15] + str(ustruct.unpack('!B', packet1[15:16])[0]) + ' ' + str(ustruct.unpack('!B', packet1[17:18])[0]) + ' ' + str(ustruct.unpack('!f', packet1[19:23])[0]) + ' ')
else:
########### Channel is busy ##########################
phase_lock_cca_fails += 1
Phase_Lock_channel_check = True
break
else:
packet1 = ustruct.pack('!15s', source_address + ' ' + ' ' + destination_address + ' ' + data)
packet1 += ustruct.pack('!B', packet_number) + ' ' + ustruct.pack('!B', send_time) + ' ' + ustruct.pack('!f',round(chrono.read(),2)) + ' '
padding = packet_size - len(packet1)
zero_padding = '0' * padding
packet = packet1 + zero_padding
s.send(packet)
transmissions += 1
phase_lock_transmissions += 1
print(packet1[:15] + str(ustruct.unpack('!B', packet1[15:16])[0]) + ' ' + str(ustruct.unpack('!B', packet1[17:18])[0]) + ' ' + str(ustruct.unpack('!f', packet1[19:23])[0]) + ' ')
elif phase_lock_transmissions >= pll_threshold:
########### If neighbour is not responding remove neighbour from PLL ##########################
phase_lock_optimization.pop(destination_address)
print(phase_lock_optimization)
phase_lock_optimization_time.pop(destination_address)
print(phase_lock_optimization_time)
break
else:
saved_transmissions += 1
if not send_time_updated and chrono.read() > wakeup_interval - safe_time:
send_time_updated = True
Full_send_time = send_time - 1
print(Full_send_time)
########### Receiving the Acknowledgement ##########################
time.sleep(packet_gap_interval)
rcv_packet1 = s.recv(packet_size)
if len(rcv_packet1) == packet_size:
string_data = ustruct.unpack('!20s', rcv_packet1[:20])[0]
rx_tx_time = ustruct.unpack('!f',rcv_packet1[20:24])[0]
rx_padding = rcv_packet1[24:]
rcv_packet1 = str(string_data)[2:-1] + ' ' + str(rx_tx_time) + '' + str(rx_padding)[2:-1]
print('rx. pkt', rcv_packet1, len(rcv_packet1))
# rcv_packet1 = rcv_packet1[2:-1]
decode_packet = rcv_packet1.split()
if len(decode_packet) >= 5:
if decode_packet[3] == data+str(packet_number) and decode_packet[1] == source_address:
if send_time_updated:
period = int(decode_packet[4]) // Full_send_time
phase_lock_optimization[decode_packet[0]] = int(decode_packet[4]) - (Full_send_time + 3) * period
else:
phase_lock_optimization[decode_packet[0]] = decode_packet[4]
phase_lock_optimization_time[decode_packet[0]] = decode_packet[5]
print(phase_lock_optimization)
print(phase_lock_optimization_time)
print('Ack received for packet {}'.format(packet_number))
ack_data_packets.append(rcv_packet1)
print(len(ack_data_packets))
packet_number += 1
ack = True
send_time += 1
else:
########### Transmission without PLL ##########################
while not ack and chrono.read() < max_wait_time:
########### Transmission continue until the acknowledgement ##########################
packet1 = ustruct.pack('!15s', source_address + ' ' + ' ' + destination_address + ' ' + data)
packet1 += ustruct.pack('!B', packet_number) + ' ' + ustruct.pack('!B', send_time) + ' ' + ustruct.pack('!f',round(chrono.read(),2)) + ' '
padding = packet_size - len(packet1)
zero_padding = '0' * padding
packet = packet1 + zero_padding
s.send(packet)
print(packet1[:15] + str(ustruct.unpack('!B', packet1[15:16])[0]) + ' ' + str(ustruct.unpack('!B', packet1[17:18])[0]) + ' ' + str(ustruct.unpack('!f', packet1[19:23])[0]) + ' ')
transmissions += 1
if not send_time_updated and chrono.read() > wakeup_interval - safe_time:
send_time_updated = True
Full_send_time = send_time - 1
print(Full_send_time)
########### Receiving the Acknowledgement ##########################
time.sleep(packet_gap_interval)
rcv_packet1 = s.recv(packet_size)
if len(rcv_packet1) == packet_size:
string_data = ustruct.unpack('!20s', rcv_packet1[:20])[0]
rx_tx_time = ustruct.unpack('!f',rcv_packet1[20:24])[0]
rx_padding = rcv_packet1[24:]
rcv_packet1 = str(string_data)[2:-1] + ' ' + str(rx_tx_time) + '' + str(rx_padding)[2:-1]
print('rx. pkt', rcv_packet1, len(rcv_packet1))
# rcv_packet1 = rcv_packet1[2:-1]
decode_packet = rcv_packet1.split()
print(decode_packet)
if len(decode_packet) >= 5:
print('conditions:', decode_packet[3] == data+str(packet_number), decode_packet[1] == source_address)
print(decode_packet[3], data+str(packet_number))
if decode_packet[3] == data+str(packet_number) and decode_packet[1] == source_address:
########### Comment this to Disable PLL #####################
# if send_time_updated:
# period = int(decode_packet[4]) // Full_send_time
# phase_lock_optimization[decode_packet[0]] = int(decode_packet[4]) - (Full_send_time + 3) * period
# else:
# phase_lock_optimization[decode_packet[0]] = decode_packet[4]
# phase_lock_optimization_time[decode_packet[0]] = decode_packet[5]
# print(phase_lock_optimization)
# print(phase_lock_optimization_time)
print('Ack received for packet {}'.format(packet_number))
ack_data_packets.append(rcv_packet1)
print(len(ack_data_packets))
packet_number += 1
ack = True
send_time += 1
if chrono.read() >= max_wait_time:
########### Remove not responding neighbours ##########################
# neighbor_adresses.remove(destination_address)
print(neighbor_adresses)
if len(neighbor_adresses) == 0:
########### If there are no neighbours only perform packet reception ##########################
only_listen = True
if not ack and destination_address != Broadcast_address and not Phase_Lock_channel_check:
########### Identify transmission failures ##########################
failed_attempts += 1
alive_time += chrono.read()
print('Awake_instance {}'.format(Awake_instance))
print('Packets {}'.format(packet_number))
print('Duty_Cycle {}'.format((alive_time / 3600) * 100))
time_left = wakeup_interval - (chrono3.read() % wakeup_interval)
chrono.stop()
chrono.reset()
chrono.start()
while chrono.read() < time_left:
lora = LoRa(power_mode=LoRa.SLEEP, region=LoRa.EU868)
pycom.rgbled(0x7f0000)
pass
lora = LoRa(power_mode=LoRa.ALWAYS_ON, region=LoRa.EU868)
chrono.stop()
chrono.reset()
print(chrono3.read())
if chrono3.read() > wakeup_interval:
insatnce = chrono3.read() // wakeup_interval
Awake_instance += insatnce
else:
Awake_instance += 1
chrono3.stop()
chrono3.reset()
print(' ')
else:
########### Broadcast Transmission ##########################
print('Awake_instance {}'.format(Awake_instance))
print('Source_address {}'.format(source_address))
print('Packets {}'.format(packet_number))
destination_address = Broadcast_address
safe_time = packet_gap_interval + lora_off_time
########### Broadcast Transmission continue during full wake up interval ##########################
while chrono.read() < wakeup_interval - safe_time:
print('chrono:', chrono.read(), wakeup_interval - safe_time)
data = 'Data'
packet1 = ustruct.pack('!15s', source_address + ' ' + ' ' + destination_address + ' ' + data)
packet1 += ustruct.pack('!B', packet_number) + ' ' + ustruct.pack('!B', send_time) + ' ' + ustruct.pack('!f',round(chrono.read(),2)) + ' '
padding = packet_size - len(packet1)
zero_padding = '0' * padding
packet = packet1 + zero_padding
lora = LoRa(power_mode=LoRa.ALWAYS_ON, region=LoRa.EU868)
s.send(packet)
print(packet1[:15] + str(ustruct.unpack('!B', packet1[15:16])[0]) + ' ' + str(ustruct.unpack('!B', packet1[17:18])[0]) + ' ' + str(ustruct.unpack('!f', packet1[19:23])[0]) + ' ')
chrono2.start()
while chrono2.read() < packet_gap_interval:
lora = LoRa(power_mode=LoRa.SLEEP, region=LoRa.EU868)
chrono2.stop()
chrono2.reset()
transmissions += 1
broadcast_time_save += packet_gap_interval
send_time += 1
packet_number += 1
alive_time += chrono.read()
Awake_instance += 1
time_left = wakeup_interval - chrono3.read()
chrono.stop()
chrono.reset()
chrono.start()
while chrono.read() < time_left:
lora = LoRa(power_mode=LoRa.SLEEP, region=LoRa.EU868)
pycom.rgbled(0x7f0000)
pass
lora = LoRa(power_mode=LoRa.ALWAYS_ON, region=LoRa.EU868)
pycom.rgbled(0x007f00)
chrono.stop()
chrono.reset()
print(chrono3.read())
chrono3.stop()
chrono3.reset()
print(' ')
packet_status = False
elif not channel_status :
########### Packet transmission detected and set to receive mode ##########################
noise_found = True
print('Receiving Data')
time_now = chrono3.read()
########## Fast sleep optimization ##########################
while chrono3.read() < (packet_gap_interval * 1.1 + time_now):
cca_list.append(str(lora.ischannel_free(-100)))
if cca_list.count('True') <= 10 and chrono3.read() > (packet_gap_interval + time_now):
print(cca_list.count('True'))
print(chrono3.read())
noise_found = False
print('Noise Detected')
noise_detected_counter += 1
break
lora = LoRa(power_mode=LoRa.ALWAYS_ON, region=LoRa.EU868)
cca_list.clear()
event = 0
while event != 1 and noise_found:
event = lora.events()
if chrono3.read() >= fast_sleep_threshold:
fast_sleep_time_save += wakeup_interval - fast_sleep_threshold
break
########### Packet reception ##########################
rcv_packet = s.recv(packet_size)
print(len(rcv_packet))
if len(rcv_packet) > 0:
string_data = ustruct.unpack('!15s', rcv_packet[:15])[0]
rx_data_number = ustruct.unpack('!B',rcv_packet[15:16])[0]
rx_sent_time = ustruct.unpack('!B',rcv_packet[17:18])[0]
rx_tx_time = ustruct.unpack('!f',rcv_packet[19:23])[0]
rx_padding = rcv_packet[23:]
rcv_packet = str(string_data)[2:-1] + str(rx_data_number) + ' ' + str(rx_sent_time) + ' ' + str(rx_tx_time) + str(rx_padding)[2:-1]
print('rx. pkt', rcv_packet, len(rcv_packet))
# rcv_packet = rcv_packet[2:-1]
decode_packet = rcv_packet.split()
print('decoded packet', decode_packet)
if len(decode_packet) >= 6:
receiving_data = decode_packet[0] + ' ' + decode_packet[2] + ' ' + decode_packet[3]
if decode_packet[1] == source_address:
########### Unicast packet reception ##########################
received_full_data.append(receiving_data)
ack_packet = ustruct.pack('!20s', decode_packet[1] + ' ' + decode_packet[0] + ' Ack ' + decode_packet[2] + ' ' )
ack_packet += ustruct.pack('!f', float(decode_packet[4])) + ''
padding = packet_size - len(ack_packet)
zero_padding = '0' * padding
ack_packet = ack_packet + zero_padding
print('sending ack')
print(ack_packet)
s.send(ack_packet)
elif decode_packet[1] == Broadcast_address:
########### Broadcast packet reception ##########################
received_full_data.append(receiving_data)
else:
print('Not For me')
else:
print('Unexpected Packet')
pass
########### Information about received packets ##########################
print(len(received_full_data))
alive_time += chrono.read()
print('Awake_instance {}'.format(Awake_instance))
print('Source_address {}'.format(source_address))
if len(decode_packet) >= 5:
print('Sender_address {}'.format(decode_packet[0])) ### source address of sender
print('Alive_time {}'.format(alive_time))
print('Packets {}'.format(packet_number))
print('Duty_Cycle {}'.format((alive_time/3600)*100))
if transmission_type == 'Unicast':
########### Unicast Information ##########################
print('Packets_Received {}'.format(len(received_full_data)))
print('failed_attempts {}'.format(failed_attempts))
print('phase_lock_time_saving {}'.format(phase_lock_time_saving))
print('phase_lock_cca_fails {}'.format(phase_lock_cca_fails))
print('Optimized_Duty_Cycle_Unicast {}'.format(((alive_time - phase_lock_time_saving) / 3600) * 100))
print('Transmissions {}'.format(transmissions + saved_transmissions))
print('Optimized_Transmissions {}'.format(transmissions))
else:
########### Broadcast Information ##########################
print('Optimized_Duty_Cycle_broadcast {}'.format(((alive_time - broadcast_time_save) / 3600) * 100))
print('Packets_Received {}'.format(len(received_full_data)))
print('Transmissions {}'.format(transmissions))
print('noise_detected_counter {}'.format(noise_detected_counter))
print('fast_sleep_time_save {}'.format(fast_sleep_time_save))
time_left = wakeup_interval - chrono3.read()
chrono.stop()
chrono.reset()
chrono.start()
Awake_instance += 1
while chrono.read() < time_left:
pycom.rgbled(0x7f0000)
lora = LoRa(power_mode=LoRa.SLEEP, region=LoRa.EU868)
pass
lora = LoRa(power_mode=LoRa.ALWAYS_ON, region=LoRa.EU868)
pycom.rgbled(0x007f00)
chrono.stop()
chrono.reset()
print(chrono3.read())
chrono3.stop()
chrono3.reset()
print(' ')
else:
########### No Packet to transmit so going back to sleep mode ##########################
print('Going back to Sleep')
print('Awake_instance {}'.format(Awake_instance))
print('Source_address {}'.format(source_address))
cca_list.clear()
alive_time += chrono.read()
print('Alive_time {}'.format(alive_time))
print('Packets {}'.format(packet_number))
print('Duty_Cycle {}'.format((alive_time / 3600) * 100))
if transmission_type == 'Unicast':
########### Unicast Information ##########################
print('Packets_Received {}'.format(len(received_full_data)))
print('failed_attempts {}'.format(failed_attempts))
print('phase_lock_time_saving {}'.format(phase_lock_time_saving))
print('phase_lock_cca_fails {}'.format(phase_lock_cca_fails))
print('Optimized_Duty_Cycle_Unicast {}'.format(((alive_time - phase_lock_time_saving) / 3600) * 100))
print('Transmissions {}'.format(transmissions + saved_transmissions))
print('Optimized_Transmissions {}'.format(transmissions))
else:
########### Broadcast Information ##########################
print('Optimized_Duty_Cycle_broadcast {}'.format(((alive_time - broadcast_time_save) / 3600) * 100))
print('Packets_Received {}'.format(len(received_full_data)))
print('Transmissions {}'.format(transmissions))
print('noise_detected_counter {}'.format(noise_detected_counter))
print('fast_sleep_time_save {}'.format(fast_sleep_time_save))
Awake_instance += 1
while chrono3.read() < wakeup_interval:
lora = LoRa(power_mode=LoRa.SLEEP, region=LoRa.EU868)
pycom.rgbled(0x7f0000)
pass
lora = LoRa(power_mode=LoRa.ALWAYS_ON, region=LoRa.EU868)
pycom.rgbled(0x007f00)
chrono.stop()
chrono.reset()
print(chrono3.read())
chrono3.stop()
chrono3.reset()
print(' ')
##### for testing purposes
if (utime.ticks_ms() - testing_start - vl.time_to_write)/1000 >= 600: # 10 minutes
vl.save()
print('Timer deinitiated')
sys.exit()
except Exception as e:
print('Timer deinitiated')
# write_to_log('main: {}'.format(e), str(current_time))
print('Shutting down due to following error in main loop:')
print(sys.print_exception(e))
sys.exit()