Gateway doesn't send LoRa Wan packets after deep sleep

[gaet]

Hi everybody,

I'm using The Things Indoor gateway to transfer data to my application in TTN. It works well when used in a loop, I can send every packets that I want, the counter increments well and everything. But, when I use deep sleep on my Lopy4 it seems like my gateway doesn't see the packets even if it did transfer the first. I have read almost every topic about deep sleep when using LoRa Wan but none of the solutions is working for me. I am using lora.nvram_save() and restore functions.

Here is my code for you to have a look :

#***********************************************************************
#*****
#*****			INITIALISATION
#*****
#***********************************************************************

#-----------------------------------------------------------------------
#     			IMPORTS / INCLUDE
#-----------------------------------------------------------------------

import pycom
import time
from network import LoRa
import socket
import machine
from machine import Pin
import binascii

import dht

#-----------------------------------------------------------------------
#     			DEFINITION DES CONSTANTES
#-----------------------------------------------------------------------

#-----------------------------------------------------------------------
#     			FONCTIONS COMMUNES QUI SERONT APPELEES
#-----------------------------------------------------------------------
pycom.wifi_on_boot(False) #pour eviter crash
#***********************************************************************
#*****
#*****			CONFIGURATION
#*****
#***********************************************************************
pycom.heartbeat(False)
#-----------------------------------------------------------------------
#     			INSTANCIATIONS
#-----------------------------------------------------------------------

th  = dht.DTH(Pin('P22', mode=Pin.OPEN_DRAIN),1)
# initialize LoRa in LORAWAN mode.
# Please pick the region that matches where you are using the device:
# Asia = LoRa.AS923
# Australia = LoRa.AU915
# Europe = LoRa.EU868
# United States = LoRa.US915
#SF=[7;12] répartir les SF entre les capteurs
LORA_NODE_DR = 4

if machine.reset_cause() == machine.DEEPSLEEP_RESET:

    lora = LoRa(mode=LoRa.LORAWAN, region=LoRa.EU868,sf=8,bandwidth=LoRa.BW_125KHZ)
    lora.nvram_restore()
    while not lora.has_joined():
        time.sleep(4)
        print("Trying to reconnect after deep sleep")
    print("join not first time")
    s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
    s.setsockopt(socket.SOL_LORA, socket.SO_DR, LORA_NODE_DR)
    s.setblocking(False)
    #s.bind(2)

else:
    lora = LoRa(mode=LoRa.LORAWAN, region=LoRa.EU868,sf=8,bandwidth=LoRa.BW_125KHZ)
    app_eui = binascii.unhexlify('XXXXXXXXXXXXXXXXX') #unique pour l'application
    app_key = binascii.unhexlify('XXXXXXXXXX') #a changer pour chaque capteur
    lora.join(activation=LoRa.OTAA, auth=(app_eui, app_key), timeout=0) # join a network using OTAA (Over the Air Activation)
    while not lora.has_joined():    # wait until the module has joined the network
        time.sleep(4)
        print("not joined yet first time")

    s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
    s.setsockopt(socket.SOL_LORA, socket.SO_DR, LORA_NODE_DR)
    s.setblocking(False)

# set the 3 default channels to the same frequency (must be before sending the OTAA join request)
lora.add_channel(0, frequency=868100000, dr_min=0, dr_max=5)
lora.add_channel(1, frequency=868100000, dr_min=0, dr_max=5)
lora.add_channel(2, frequency=868100000, dr_min=0, dr_max=5)
# remove all the non-default channels
for i in range(3, 16):
    lora.remove_channel(i)


#***********************************************************************
#*****
#*****			BOUCLE PRINCIPALE
#*****
#***********************************************************************

def run():

    #result = th.read()
    #s.send(str(result.temperature))
    s.send("Yo")
    pycom.rgbled(0xff00) #led verte après envoi de message
    time.sleep(0.4)
    pycom.rgbled(0x0000)
    data = s.recv(64)
    print(data)
    return 0

run()
#reset au bout de 20 sec
lora.nvram_save()
machine.deepsleep(20000)

I feel like i've tried everything but can't figure out what's wrong.
Here is a look at the traffic going through my gateway i TTN, we can see that the first packet is received but then nothing...

Thanks in advance and have a great day

[robert-hh]

@gaet I made the experience that the LoRa needs a power cycle to recover. machine.deepsleep() does not power-cycle the board. If you have a Pycom expansion board of any type, you could try pycoproc.go_to_sleep(), which switches off the LoPy4 power.

[gaet]

@robert-hh I thought this library was only working with PySense or PyTrack but not with expansion board V3.1 ?

Thank you for your answer

[robert-hh]

@gaet I have no pyboard 3.x, so I cannot test. And teher is no technical information available for the boards. But it uses the same PIC chip as the other boards.

[gaet]

@robert-hh I just tried with a PySense and py.go_to_sleep() instead of machine.deepsleep(), but the result is still the same, no packet is transfered by my gateway after the deep sleep

[gaet]

UPDATE :
I used an other Lopy4 and it works fine... The counter is reseting though but it works.

[robert-hh]

@gaet Do the two models have the same firmware?

[gaet]

@robert-hh Yeah they have the same firmware, the only thing I think I changed is the pin of the sensor, I switceh from P3 to P4, but I don't see why the first would have caused issue according to the pinout.

[robert-hh]

@gaet P4 can be used unless you have an SD card inserted.

[gaet]

@robert-hh I tried my code with all the lopy I had and P4, and it works well with all except with the first, I've updated his firmware but the data sent after deep sleep never arrive

[rcolistete]

@robert-hh Not Expansion Board v2.x, which doesn't have the PIC microcontroller.