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LoRaWANHandler.py
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LoRaWANHandler.py
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import machine
from sx1262 import *
import time
import utime
import random
# from utime import sleep_ms, sleep_us, ticks_ms, ticks_us, ticks_diff
#from uarray import array
import LoRaWAN
from LoRaWAN.MHDR import MHDR
# SPI lines are unneccesary in hardware SPI mode
# MOSI = const(7)
# MISO = const(4)
# SCLK = const(6)
# rpp
CS = const(5)
DIO1 = const(10)
BUSY = const(14)
RESET = const(15)
# ESP8266
#CS = const(0)
#DIO1 = const(16)
#BUSY = const(15)
#RESET = const(2)
#LED_PIN = const(25)
#led = machine.Pin(LED_PIN, machine.Pin.OUT)
def printHEX(msg):
for m in msg:
h = hex(m)
if (len(h) == 3):
print("0", end='')
print(h[2], end='')
if (len(h) == 4):
print(h[2], end='')
print(h[3], end='')
# e6 60 58 38 83 9d 88 34
def getBoardID():
boardID = machine.unique_id()
print("Unique board ID: ")
printHEX(boardID)
print(" ")
# LoRaWAN Handler class
class LoRaWANHandler:
'''
This class abstracts all LoRaWAN related functionality into a minimal set of functions.
It handles all LoRaWAN communication and MAC command processing internally.
The user of the class should call the send() method alone.
The default values and the available values are taken from LoRaWAN RP2-1.0.2 Regional parameters EU868 section
For the LoRaWAN functionality description see LoRaWAN Link Layer Specification v1.0.4
'''
# LoRa radio
# freqList = [867.1, 867.3, 867.5, 867.7, 867.9, 868.1, 868.3, 868.5]
freqList = [868.1, 868.3, 868.5]
defaultFreqList = [868.1, 868.3, 868.5]
DRList = [[125,12],[125,11],[125,10],[125,9],[125,8],[125,7]] # DR0 - DR5
MaxEIRP = 16
TXPowerTable = [MaxEIRP, MaxEIRP - 2, MaxEIRP - 4 , MaxEIRP - 6, MaxEIRP - 8, MaxEIRP - 10, MaxEIRP - 12, MaxEIRP - 14]
currentFreq = 0
currentDR = 0
currentPower = 0
RX2Freq = 869.525
RX2DR = 0
SXRadio = None
RXpayload = []
RXerr = None
# ABP
DevAddrABP = [] # [0x26, 0x01, 0x11, 0x5f] # MSB
NwkSKeyABP = [] # [0xc3, 0x24, 0x64, 0x98, 0xde, 0x56, 0x5d, 0x8c, 0x55, 0x88, 0x7c, 0x05, 0x86, 0xf9, 0x82, 0x26] # MSB
AppSKeyABP = [] #[0x15, 0xf6, 0xf4, 0xd4, 0x2a, 0x95, 0xb0, 0x97, 0x53, 0x27, 0xb7, 0xc1, 0x45, 0x6e, 0xc5, 0x45] # MSB
frameCounterABP = 0 # Persistent
# OTAA
DevEUI = [] #[0x16, 0x86, 0xc4, 0x97, 0x72, 0x9d, 0xc5, 0xda] # MSB
JoinEUI = [] #[0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01] # MSB
AppKey = [] #[0x59, 0xf4, 0x5c, 0xd8, 0xb3, 0x65, 0x53, 0x4b, 0x4d, 0x51, 0x03, 0xe0, 0x0f, 0x83, 0x69, 0x6a] # MSB
DevNOnce = 0 # Persistent
DevAddr = []
NwkSKey = []
AppSKey = []
# LoRaWAN link
# TODO: Implement RX1DROffset - DONE
# TODO: After OTAA update DL RX CF - DONE
RX1DRMapping = [
[0, 0, 0, 0, 0, 0],
[1, 0, 0, 0, 0, 0],
[2, 1, 0, 0, 0, 0],
[3, 2, 1, 0, 0, 0],
[4, 3, 2, 1, 0, 0],
[5, 4, 3, 2, 1, 0]
]
RX1DROffset = 0
RX2DataRate = 0
DLSettings = None
RXDelay = None
CFList = None
maxPayloadSizes = [51, 51, 51, 115, 222, 222]
Connected = False
FrameQueue = [] # list of (priority, flags, payload)
FrameCount = 0
NbTrans = 1
FCntUp = 0
FCntDown = -1
Result = False
INVALID = const(0)
VALID = const(1)
# RX1 = const(2)
# RX2 = const(3)
Receive = INVALID # Receive window status
RECEIVE_DELAY1 = (1 + 4)
RECEIVE_DELAY2 = (2 + 4)
JOIN_ACCEPT_DELAY1 = (5 + 4)
JOIN_ACCEPT_DELAY2 = (6 + 4)
RETRANSMIT_TIMEOUT_MIN = 1
RETRANSMIT_TIMEOUT_MAX = 3
ADR_ACK_LIMIT = 64
ADR_ACK_DELAY = 32
# FCtrl constants
# downlink frames
# ADR[7] RFU[6] ACK[5] FPending[4] FOptsLen[3..0]
# uplink frames
# ADR[7] ADRACKReq[6] ACK[5] ClassB[4] FOptsLen[3..0]
ADR = 0x80
RFU = 0x40
ACK = 0x20
FPENDING = 0x10
FOPTSLEN = 0x0F
ADRACKREQ = 0x40
CLASSB = 0x10
# MAC Command Req/Ans - CID
LINKCHECK = 0x02
LINKADR = 0x03
DUTYCYCLE = 0x04
RXPARAMSETUP = 0x05
DEVSTATUS = 0x06
NEWCHANNEL = 0x07
RXTIMINGSETUP = 0x08
TXPARAMSETUP = 0x09
DLCHANNEL = 0x0A
DEVICETIME = 0x0D
################################################################################
def TXcb(self, events):
if events & SX1262.TX_DONE:
print("TX done.")
def RXcb(self, events):
if events & SX1262.RX_DONE:
self.RXpayload, self.RXerr = self.SXRadio.recv()
# print("RXcb receive")
# print("RXcb receive: ", utime.ticks_ms())
# error = SX1262.STATUS[RXerr]
# print(RXpayload)
# if (error != ERR_NONE):
# print(error)
def __init__(self, configuration):
self.DevAddrABP = configuration.DevAddrABP
self.NwkSKeyABP = configuration.NwkSKeyABP
self.AppSKeyABP = configuration.AppSKeyABP
self.DevEUI = configuration.DevEUI
self.JoinEUI = configuration.JoinEUI
self.AppKey = configuration.AppKey
print("Initializing SX1262 radio module")
self.SXRadio = SX1262(cs=CS,irq=DIO1,rst=RESET,gpio=BUSY)
# LoRa
# freq = 867.1, 867.3, 867.5, 867.7, 867.9, 868.1, (868.3), 868.5
# bw = 125.0, 250.0
# sf = 5 - 12
# cr = 5 - 8
# power = -9 - (-5) - +22
# preambleLength = 8
# 868.3, 125, 12, 5, SX126X_SYNC_WORD_PUBLIC, 5, 8, 0.0, true
self.SXRadio.begin(
freq=self.freqList[self.currentFreq],
bw=self.DRList[self.currentDR][0],
sf=self.DRList[self.currentDR][1],
cr=5, syncWord=SX126X_SYNC_WORD_PUBLIC,
power=self.TXPowerTable[self.currentPower], currentLimit=60.0,
preambleLength=8, implicit=False, implicitLen=0xFF,
crcOn=True, txIq=False, rxIq=True,
tcxoVoltage=0.0, useRegulatorLDO=True, blocking=True)
# self.SXRadio.setBlockingCallback(False, TXcb)
self.SXRadio.setBlockingCallback(False, self.RXcb)
print ("LoRa module has been initialized.")
def randomNumber(self, separate = False):
randBuf = bytearray(4)
self.SXRadio.readRegister(SX126X_REG_RANDOM_NUMBER_0, randBuf, 4)
if separate:
return list(randBuf)
else:
return ((randBuf[0] << 24) | (randBuf[1] << 16) | (randBuf[2] << 8) | (randBuf[3]))
def loadFcntABP(self):
try:
f = open("fcntupabp.dat", 'r')
self.frameCounterABP = int(f.read())
except:
print("Error reading FcntUpABP value!")
self.frameCounterABP = 0
def saveFcntABP(self):
try:
f = open("fcntupabp.dat", 'w')
except:
print("Error opening FcntUpABP file!")
try:
f.write(str(self.frameCounterABP))
except:
print("Error writing FcntUpABP file!")
f.close()
def loadDevNonce(self):
try:
f = open("devnonce.dat", 'r')
self.DevNOnce = int(f.read())
except:
print("Error reading DevNonce value!")
self.DevNOnce = 0
def saveDevNonce(self):
try:
f = open("devnonce.dat", 'w')
except:
print("Error opening DevNonce file!")
try:
f.write(str(self.DevNOnce))
except:
print("Error writing DevNonce file!")
f.close()
def nextFreq(self):
# TODO: Implement random frequency hopping - DONE
self.currentFreq = random.randint(0, len(self.freqList)-1)
# self.currentFreq += 1
# if (self.currentFreq == len(self.freqList)):
# self.currentFreq = 0
# self.currentFreq = 0
return self.freqList[self.currentFreq]
def setDR(self, newDR):
if ((newDR <= 5) and (newDR >= 0) and (newDR != self.currentDR)):
self.currentDR = newDR
self.SXRadio.setBandwidth(self.DRList[self.currentDR][0])
self.SXRadio.setSpreadingFactor(self.DRList[self.currentDR][1])
def setTXPower(self, TXpower = 0):
if (TXpower < 0):
TXpower = 0
if (TXpower > 7):
TXpower = 7
if (self.currentPower != TXpower):
self.currentPower = TXpower
self.SXRadio.setOutputPower(self.TXPowerTable[TXpower])
def scan(self):
if (self.SXRadio.scanChannel() == CHANNEL_FREE):
return True
else:
return False
def sendRAW(self, msg=b'Hello'):
if (type(msg) == type("")):
msg = bytes(msg, 'utf-8')
elif (type(msg) == type([])):
msg = bytes(msg)
# CAD
while (self.scan == False):
pass
self.SXRadio.send(msg)
# This function is not in use as receive is handled by RXcb callback function
def receiveRAW(self, timeout = 3000):
if (timeout == 0):
msg, err = self.SXRadio.recv(0, False)
else:
msg, err = self.SXRadio.recv(0, True, timeout) # recv(len=0, timeout_en=False, timeout_ms=0)
error = SX1262.STATUS[err]
print("Modem status: ", error)
if len(msg) > 0:
print("Message received: ", msg)
return msg
# ABP send could be integrated into the main send method
def sendABP(self, msg = ""):
'''
Send a LoRaWAN frame on ABP activated connection
params: msg: string or bytearray
'''
if type(msg) == type(""):
encmsg = list(map(ord, msg))
elif type(msg) == type(b''):
encmsg = list(msg)
else:
print("Missing or unsupported message format. Only string and bytes/bytearray supported.")
return
self.loadFcntABP()
lorawan = LoRaWAN.new(self.NwkSKeyABP, self.AppSKeyABP)
lorawan.create(MHDR.UNCONF_DATA_UP, {'devaddr': self.DevAddrABP, 'fcnt': self.frameCounterABP, 'data': encmsg})
self.sendRAW(lorawan.to_raw())
self.frameCounterABP += 1
self.saveFcntABP()
return
def sendUnconfirmed(self, msg = ""):
'''
Send an unconfirmed frame on OTAA activated connection
Lightweight method, no receive windows opened
params: msg: string or bytearray
'''
while (self.Connected == False):
self.otaa()
if type(msg) == type(""):
encmsg = list(map(ord, msg))
elif type(msg) == type(b''):
encmsg = list(msg)
else:
print("Missing or unsupported message format. Only string and bytes/bytearray supported.")
return
self.SXRadio.setFrequency(self.nextFreq())
self.setDR(self.currentDR)
lorawan = LoRaWAN.new(self.NwkSKey, self.AppSKey)
print("Current FCntUp:", self.FCntUp)
lorawan.create(MHDR.UNCONF_DATA_UP, {'devaddr': self.DevAddr, 'fcnt': self.FCntUp, 'data': encmsg})
self.sendRAW(lorawan.to_raw())
print("TxDone")
self.FCntUp += 1
return
# End of SendUnconfirmed()
def otaa(self):
'''
Perform OTAA (Over-the-Air Activation)
The result of the activation process can be seen from Connected variable
'''
# Start
# TODO: Read Join-Accept frame for MAC layer settings - DONE
RX1Window = self.JOIN_ACCEPT_DELAY1 * 1000
RX2Window = self.JOIN_ACCEPT_DELAY2 * 1000
RXTimeout = (self.JOIN_ACCEPT_DELAY2 + 10) * 1000
self.loadDevNonce()
currentDevNOnce = bytes([self.DevNOnce & 0xFF, (self.DevNOnce >> 8) & 0xFF])
self.SXRadio.setFrequency(self.nextFreq())
self.setDR(self.currentDR)
print("Sending Join request:", end='')
lorawan = LoRaWAN.new(self.AppKey)
lorawan.create(MHDR.JOIN_REQUEST, {'deveui': self.DevEUI, 'appeui': self.JoinEUI, 'devnonce': currentDevNOnce})
msg = lorawan.to_raw()
# printHEX(msg)
self.sendRAW(msg)
print("Done")
startTime = utime.ticks_ms()
# try:
while True:
if (len(self.RXpayload) > 0):
print("Message received in RX1:", end='')
lorawan = LoRaWAN.new([], self.AppKey)
lorawan.read(self.RXpayload)
decPayload = lorawan.get_payload()
# print(lorawan.get_payload())
# print(lorawan.get_mhdr().get_mversion())
if lorawan.get_mhdr().get_mtype() == MHDR.JOIN_ACCEPT:
print("Join-Accept", end='')
if (lorawan.valid_mic()):
print("MIC: Valid")
# print("DevAddr: ", lorawan.get_devaddr())
# print("DevAddr: ", end='')
# printHEX(lorawan.get_DevAddr())
# print("\n")
# print("NwkSKey: ", lorawan.derive_nwskey(currentDevNOnce))
# print("NwkSKey: ", end='')
# printHEX(lorawan.derive_NwkSKey(currentDevNOnce))
# print("\n")
# print("AppSKey: ", lorawan.derive_appskey(currentDevNOnce))
# print("AppSKey: ", end='')
# printHEX(lorawan.derive_AppSKey(currentDevNOnce))
# print("\n")
self.DevAddr = lorawan.get_devaddr()
self.NwkSKey = lorawan.derive_nwskey(currentDevNOnce)
self.AppSKey = lorawan.derive_appskey(currentDevNOnce)
self.DLSettings = lorawan.mac_payload.frm_payload.get_dlsettings()
self.RXDelay = lorawan.mac_payload.frm_payload.get_rxdelay()
self.CFList = lorawan.mac_payload.frm_payload.get_cflist()
self.Connected = True
print("OTAA activation successful!")
break
else:
print("MIC: Invalid")
self.RXpayload = []
else:
print("Something else")
self.RXpayload = []
# time.sleep_ms(10)
# print("Current time: ", utime.ticks_ms())
# print("Time elapsed since start: ", utime.ticks_diff(utime.ticks_ms, startTime))
# Timeout
if (utime.ticks_diff(utime.ticks_ms(), startTime) > (RX2Window - 100)):
print("RX1 Timeout!")
break
# Receive RX2, only if nothing received in RX1 window
if (self.Connected == False):
self.SXRadio.setFrequency(self.RX2Freq) # RX2 window uses a specific frequency
self.setDR(self.RX2DR) # and data rate
while True:
if (len(self.RXpayload) > 0):
print("Message received in RX2:", end='')
lorawan = LoRaWAN.new([], self.AppKey)
lorawan.read(self.RXpayload)
decPayload = lorawan.get_payload()
if lorawan.get_mhdr().get_mtype() == MHDR.JOIN_ACCEPT:
print("Join-Accept", end='')
if (lorawan.valid_mic()):
print("MIC: Valid")
self.DevAddr = lorawan.get_devaddr()
self.NwkSKey = lorawan.derive_nwskey(currentDevNOnce)
self.AppSKey = lorawan.derive_appskey(currentDevNOnce)
# DLSettings: RX1DROffset[6:4], RX2DataRate[3:0]
self.DLSettings = lorawan.mac_payload.frm_payload.get_dlsettings()
# RECEIVE_DELAY1
self.RXDelay = lorawan.mac_payload.frm_payload.get_rxdelay()
# Can be not present
self.CFList = lorawan.mac_payload.frm_payload.get_cflist()
self.Connected = True
print("OTAA activation successful!")
break
else:
print("MIC: Invalid")
self.RXpayload = []
else:
print("Something else")
self.RXpayload = []
# Timeout
if (utime.ticks_diff(utime.ticks_ms(), startTime) > (RXTimeout)):
print("RX2 Timeout!")
break
# except:
# print("Error occured during JoinAccept receiving!")
# finally:
self.DevNOnce += 1
self.saveDevNonce()
self.SXRadio.setFrequency(self.nextFreq())
self.setDR(self.currentDR)
if (self.Connected):
RX2DR = self.DLSettings & 0x0F
RX1DROffset = (self.DLSettings >> 4) & 0x07
if (self.RXDelay == 0):
self.RXDelay = 1
self.RECEIVE_DELAY1 = self.RXDelay + 4
self.RECEIVE_DELAY2 = self.RECEIVE_DELAY1 + 1
if (self.CFList != None):
self.freqList = self.defaultFreqList.copy()
for i in range(5):
self.freqList.append(((self.CFList[3 * i + 2] << 16) + (self.CFList[3 * i + 1] << 8) + (self.CFList[3 * i])) / 10000)
return
# End of otaa()
def send(self, msg = "", confirmed = False):
'''
The main LoRaWAN frame handler method
As this method handles everything LoRa related hhis should be the only method called from outside.
params: msg: string or bytearray
confirmed: True / False
return: in case of confirmed send, true if confirmation was received, otherwise false
in case of unconfirmed send, true if any downlink frame received, otherwise false
Note: either true or false whether the server has received the frame is uncertain
'''
def CheckFrameValidity(frame):
'''
Frame is valid if:
- MIC is valid
- DevAddr is a match
- FcntDown is greater than previous
- Fport is 0..223 (FPort field is optional)
Frame is invalid if:
- FOptLen non-zero and FPort is 0
'''
# TODO: FOptsLen != 0 and FPort == 0 is invalid frame - DONE
validity = False
if ((frame.get_mhdr().get_mtype() == MHDR.CONF_DATA_DOWN) or
(frame.get_mhdr().get_mtype() == MHDR.UNCONF_DATA_DOWN)):
if (frame.valid_mic()):
if (bytes(reversed(frame.get_devaddr())) == bytes(self.DevAddr)):
FrameFcnt = frame.get_mac_payload().get_fhdr().get_fcnt()
if ((FrameFcnt[1] * 256 + FrameFcnt[0]) > self.FCntDown):
if (frame.get_mac_payload().get_fport() == None):
validity = True
elif (frame.get_mac_payload().get_fport() < 224):
validity = True
if ((frame.get_mac_payload().get_fhdr().get_fctrl() & self.FOPTSLEN > 0) and
(frame.get_mac_payload().get_fport() == 0)):
validity = False
print("FOptsLen non-zero and FPort is 0")
else:
print("Wrong FPort number!")
else:
print("FCntDown not incremented!")
else:
print("DevAddr mismatch!", bytes(reversed(frame.get_devaddr())), " vs ", bytes(self.DevAddr))
else:
print("Invalid MIC")
return validity
# End of CheckFrameValidity()
def FindHighestPriorityFrame():
'''
Find the first occurence of the highest priority frame
'''
firstHighest = 100
firstHighestIdx = 0
for idx in range(len(self.FrameQueue)):
if (self.FrameQueue[idx][0] < firstHighest):
firstHighest = self.FrameQueue[idx][0]
firstHighestIdx = idx
return (firstHighest, firstHighestIdx)
def ProcessMACCommands(CommandReqList):
CommandAnsList = bytearray()
idx = 0
print("\n\tProcessing MAC Commands")
if ((CommandReqList == None) or (len(CommandReqList) == 0)):
print("Empty CommandReqList")
return None
while (idx < len(CommandReqList)):
if (CommandReqList[idx] == self.LINKADR): # Request for rate adaptation
# DataRate (1)[7:4], TXPower (1)[3:0]
# ChMask (2)
# Redundancy: ChMaskCntl (1)[6:4], NbTrans [3:0]
# TODO: Process ChannelMask
print("\t\tLINKADR: ", end='')
ans = 0
idx += 1
p = (CommandReqList[idx] >> 4) & 0x0F
if (p != 0xF): # Value 0xF must be ignored
if (p < len(self.DRList)):
print("currentDR: ", p, end='')
self.currentDR = p
ans = ans | 0x02 # Bit 1 is DataRateACK
p = CommandReqList[idx] & 0x0F
if (p != 0xF): # Value 0xF must be ignored
if (p < len(self.TXPowerTable)):
print(" currentPower: ", p)
self.currentPower = p
ans = ans | 0x04 # Bit 2 is PowerACK
idx += 3
p = CommandReqList[idx] & 0x0F
if (p == 0): # If NbTrans field is 0
p == 1 # use the Default value
self.NbTrans = p
idx += 1
ans = ans | 0x01 # Bit 0 is ChannelMaskACK
CommandAnsList += bytes([self.LINKADR, ans & 0x07])
elif (CommandReqList[idx] == self.DUTYCYCLE): # Transmit Duty Cycle
# DutyCyclePL (1)[3:0]
print("\t\tDUTYCYCLE")
idx += 2
CommandAnsList += bytes([self.DUTYCYCLE])
elif (CommandReqList[idx] == self.RXPARAMSETUP): # Receive Window Parameters
# DLSettings (1)
# Frequency (3)
print("\t\tRXPARAMSETUP: ", end='')
ans = 0
idx += 1
p = (CommandReqList[idx] >> 4) & 0x07
print(" RX1DROffset: ", p, end='')
self.RX1DROffset = p
p = CommandReqList[idx] & 0x0F
print(" RX2DataRate: ", p, end='')
self.RX2DataRate = p
idx += 1
newFreq = CommandReqList[idx] + (CommandReqList[idx + 1] << 8) + (CommandReqList[idx + 2] << 16)
print(" RX2Freq: ", newFreq / 10000)
self.RX2Freq = newFreq / 10000
idx += 3
CommandAnsList += bytes([self.RXPARAMSETUP, 0x07])
elif (CommandReqList[idx] == self.DEVSTATUS): # End-Device Status
# No payload (0)
# Ans: Battery (1)
# 0 - External power source
# 1..254 - Battery level
# 255 - Not able to measure
# RadioStatus (1)[5:0]
print("\t\tDEVSTATUS", end='')
idx += 1
batt = 0
snr = self.SXRadio.getSNR()
print("SNR:", snr)
CommandAnsList += bytes([self.DEVSTATUS, batt, (snr >> 2)])
elif (CommandReqList[idx] == self.NEWCHANNEL): # TODO
# ChIndex (1)
# Frequency (3)
# DRRange (1)
print("\t\tNEWCHANNEL", end='')
idx += 6
CommandAnsList += bytes([self.NEWCHANNEL, 0x03])
elif (CommandReqList[idx] == self.RXTIMINGSETUP):
# RxTimingSettings (1)[3:0]
print("\t\tRXTIMINGSETUP", end='')
idx +=1
delay = CommandReqList[idx] & 0x0F
if (delay == 0):
delay = 1
self.RECEIVE_DELAY1 = delay + 4
self.RECEIVE_DELAY2 = self.RECEIVE_DELAY1 + 1
idx +=1
CommandAnsList += bytes([self.RXTIMINGSETUP])
elif (CommandReqList[idx] == self.TXPARAMSETUP):
# EIRP_DwellTime (1)
print("\t\tTXPARAMSETUP", end='')
idx += 2
CommandAnsList += bytes([self.TXPARAMSETUP])
elif (CommandReqList[idx] == self.DLCHANNEL): # TODO
# ChIndex (1)
# Frequency (3)
print("\t\tDLCHANNEL", end='')
idx += 5
CommandAnsList += bytes([self.DLCHANNEL, 0x03])
return list(CommandAnsList)
def ProcessFrame(frame):
print("Processing frame: ", end='')
# Update FCntDown
FrameFcnt = frame.get_mac_payload().get_fhdr().get_fcnt()
self.FCntDown = FrameFcnt[1] * 256 + FrameFcnt[0]
if (confirmed == False):
self.Result = True
if ((confirmed) and ((frame.get_mac_payload().get_fhdr().get_fctrl() & self.ACK) != 0)):
self.Result = True
if (frame.get_mhdr().get_mtype() == MHDR.CONF_DATA_DOWN):
# If no frame in queue create an empty frame with ACK set
# If there is, find the highest priority and set ACK
print("Confirmed Data down")
if (len(self.FrameQueue) == 0):
# self.FrameQueue.append((0, self.ACK, list(b'\x00')))
self.FrameQueue.append((0, self.ACK, None))
else:
firstHighestIdx = FindHighestPriorityFrame()[1]
fctrl = self.FrameQueue[firstHighestIdx][1]
fctrl = fctrl & self.ACK
self.FrameQueue[firstHighestIdx][1] = fctrl
print ("Received message: ", bytes(frame.get_payload()))
if (frame.get_mhdr().get_mtype() == MHDR.UNCONF_DATA_DOWN):
# Nothing to do here
print("Unconfirmed Data down")
pass
# ADR
# FPending
if ((frame.get_mac_payload().get_fhdr().get_fctrl() & self.FPENDING) != 0):
print("FPending ")
if (len(self.FrameQueue) == 0):
self.FrameQueue.append((0, 0, None))
# FoptsLen != 0 - MAC commands in FOpts
if ((frame.get_mac_payload().get_fhdr().get_fctrl() & self.FOPTSLEN) != 0):
answer = ProcessMACCommands(frame.get_mac_payload().get_fhdr().get_fopts())
self.FrameQueue.append((0, 0, answer))
# FPorts == 0 - MAC commands in FRMPayload
if (frame.get_mac_payload().get_fport() == 0):
answer = ProcessMACCommands(frame.get_mac_payload().get_frm_payload())
self.FrameQueue.append((0, 0, answer))
return
# End of ProcessFrame()
RX1Window = self.RECEIVE_DELAY1 * 1000
RX2Window = self.RECEIVE_DELAY2 * 1000
RXTimeout = (self.RECEIVE_DELAY2 + 10) * 1000
lwFrame = None
self.Result = False
# Check if end-device is connected and try connecting
while (self.Connected == False):
self.otaa()
# TODO: Check message length, if OK add to the queue - DONE
if (msg == None):
self.FrameQueue.append((2, 0, None))
else:
if (len(msg) > self.maxPayloadSizes[self.currentDR]):
print("Message is too long for the current DR settings. Max:", self.maxPayloadSizes[self.currentDR])
return False
if type(msg) == type(""):
encmsg = list(map(ord, msg))
elif type(msg) == type(b''):
encmsg = list(msg)
else:
print("Unsupported message format. Only string and bytes/bytearray supported.")
return
self.FrameQueue.append((2, 0, encmsg))
while (len(self.FrameQueue) != 0): # Frame Queue processing loop
firstHighest = 100
firstHighestIdx = 0
print("Queue length:", len(self.FrameQueue))
print(self.FrameQueue)
print("FCntUp:", self.FCntUp, " FCntDown:", self.FCntDown)
# Create next frame
firstHighest, firstHighestIdx = FindHighestPriorityFrame()
print("Highest priority is:", firstHighest, " at index:", firstHighestIdx)
if (firstHighest == 0): # Create MAC answer frame
lwFrame = LoRaWAN.new(self.NwkSKey, self.AppSKey)
# print("Current FCntUp:", self.FCntUp)
if (self.FrameQueue[firstHighestIdx][2] != None):
lwFrame.create(MHDR.UNCONF_DATA_UP, {'fport': 0x00, 'devaddr': self.DevAddr, 'fcnt': self.FCntUp, 'data': self.FrameQueue[firstHighestIdx][2]})
else:
lwFrame.create(MHDR.UNCONF_DATA_UP, {'fport': 0x00, 'devaddr': self.DevAddr, 'fcnt': self.FCntUp})
lwFrame.mac_payload.fhdr.set_fctrl(self.FrameQueue[firstHighestIdx][1] | self.ADR) # ADR is always set
self.FrameQueue.pop(firstHighestIdx)
if (firstHighest == 2): # Create user data frame
if confirmed:
print("Sending confirmed data")
msgtype = MHDR.CONF_DATA_UP
else:
print("Sending unconfirmed data")
msgtype = MHDR.UNCONF_DATA_UP
lwFrame = LoRaWAN.new(self.NwkSKey, self.AppSKey)
print("Current FCntUp:", self.FCntUp)
if (self.FrameQueue[firstHighestIdx][2] != None):
lwFrame.create(msgtype, {'devaddr': self.DevAddr, 'fcnt': self.FCntUp, 'data': self.FrameQueue[firstHighestIdx][2]})
else:
lwFrame.create(msgtype, {'devaddr': self.DevAddr, 'fcnt': self.FCntUp})
lwFrame.mac_payload.fhdr.set_fctrl(self.FrameQueue[firstHighestIdx][1] | self.ADR) # ADR is always set
self.FrameQueue.pop(firstHighestIdx)
self.FrameCount = 0
self.RXpayload = []
self.Receive = self.INVALID
while ((self.FrameCount < self.NbTrans) and (self.Receive != self.VALID)): # Frame retransmission loop
print("FrameCount:", self.FrameCount, "NbTrans:", self.NbTrans)
# Wait RETRANSMIT_TIMEOUT
if (self.FrameCount != 0):
utime.sleep_ms(RETRANSMIT_TIMEOUT_MIN + (self.randomNumber() % ((RETRANSMIT_TIMEOUT_MAX - RETRANSMIT_TIMEOUT_MIN) * 1000)))
# Send
msg = lwFrame.to_raw()
self.sendRAW(msg)
print("TxDone on", self.freqList[self.currentFreq], "Hz, DR:", self.currentDR)
startTime = utime.ticks_ms()
# print("Start:", startTime)
# Receive RX1
# Set DR from RX1DROffset
self.setDR(self.RX1DRMapping[self.currentDR][self.RX1DROffset])
while True:
if (len(self.RXpayload) > 0):
print("Message received in RX1 window: DR:", self.currentDR, "at", utime.ticks_ms(), end='')
lwFrame = LoRaWAN.new(self.NwkSKey, self.AppSKey)
lwFrame.read(self.RXpayload)
decPayload = lwFrame.get_payload()
if (CheckFrameValidity(lwFrame)):
print(" Valid")
self.Receive = self.VALID
break
else:
print(" Invalid")
self.RXpayload = []
# Timeout
if (utime.ticks_diff(utime.ticks_ms(), startTime) > (RX2Window - 100)):
print("RX1 Timeout!")
break
# Receive RX2, only if nothing received in RX1 window
if (self.Receive == self.INVALID):
self.SXRadio.setFrequency(self.RX2Freq)
self.setDR(self.RX2DR)
while True:
if (len(self.RXpayload) > 0):
print("Message received in RX2 window: DR:", self.currentDR, "at", utime.ticks_ms(), end='')
lwFrame = LoRaWAN.new(self.NwkSKey, self.AppSKey)
lwFrame.read(self.RXpayload)
decPayload = lwFrame.get_payload()
if (CheckFrameValidity(lwFrame)):
print(" Valid")
self.Receive = self.VALID
break
else:
print(" Invalid")
self.RXpayload = []
# Timeout
if (utime.ticks_diff(utime.ticks_ms(), startTime) > (RXTimeout)):
print("RX2 Timeout!")
break
# Hop frequency
self.SXRadio.setFrequency(self.nextFreq())
self.setDR(self.currentDR)
self.FrameCount += 1
# End of Frame retransmission loop
# Process received frame
if (self.Receive == VALID):
ProcessFrame(lwFrame)
# Increment FCntUp
self.FCntUp += 1
# End of Frame Queue processing loop
return self.Result
# End of send()
# End of LoRaWANHandler()
def test():
print("\t\t---LoRaWANHandler class tests---")
lh = LoRaWANHandler()
print("\t\t---OTAA activation---")
lh.otaa()
utime.sleep_ms(5000)
print("\t\t---Sending unconfirmed message from separate method---")
print("\t\t---Result:", lh.sendUnconfirmed("Hi!"))
utime.sleep_ms(5000)
print("\t\t---Sending unconfirmed message---")
print("\t\t---Result:", lh.send("Hi!"))
print("\t\t---Sending confirmed message")
print("\t\t---Result:", lh.send("Hi!", True))
def ABPtest():
print("\t\t---LoRaWANHandler ABP tests---")
lh = LoRaWANHandler()
print("\t\t---Sending ABP messages---")
print("\t\t---Result:", lh.sendABP("Hi!"))
utime.sleep_ms(5000)
print("\t\t---Result:", lh.sendABP("Hi!"))
# SGkh
if (locals()['__name__'] == '__main__'):
test()
ABPtest()
#import LoRaWANHandler
#lh = LoRaWANHandler.LoRaWANHandler()
#lh.otaa()
#lh.freqList