TTN join accept not handled properly

[miroslav.petrov]

+1
My LoPy is also constantly sending join requests to the gateway and is not receiving the join accept. I am using the example code from the pycom docs.

[bucknall]

Hi @miroslav.petrov,

I'll push an update later today but do not use the example from the docs for the nano-gateway, instead use the code on GitHub -

https://github.com/pycom/pycom-libraries/tree/master/examples/lorawan-nano-gateway

This includes both the nano-gateway and the node (OTAA or ABP)

[miroslav.petrov]

@bucknall
I am using LoPy as node and the gateway is ic880a(it is not mine). I am using the things network. I tried this example:
https://github.com/pycom/pycom-libraries/blob/master/examples/lorawan-nano-gateway/abp_node.py
and I changed the channels to the default in TTN. However, the node is not able to either send or receive messages.

[bucknall]

@miroslav.petrov What version of firmware is your LoPy using? You can find out with this command:

import os
os.uname()

[miroslav.petrov]

@bucknall

The latest.

[bucknall]

@miroslav.petrov I assume you're not based in an 868 MHz region? What do you have the data rate (e.g. dr_min=0, dr_max=5) set to?

[miroslav.petrov]

@bucknall
I am in Bulgaria we are using 868mhz. The data rate is set to (dr_min=0, dr_max=5) as in the example. If I change the dr_max to more than 5 I get errors.

[jmarcelino]

@miroslav.petrov in 868Mhz EU and with a multichannel gateway you can delete all the remove_channel and add_channel calls as you'll just the default channels, which match TTN's

[bucknall]

@miroslav.petrov Hmm ok. Yes, the data rate you have set is correct. Can you share your abp_node.py file with your channel changes, please? If you're not using the nano-gateway, you don't need to set the channels as the gateway you are using will likely be multichannel.

[miroslav.petrov]

@bucknall
I tried setting the channels with this code

from network import LoRa
import socket
import binascii
import struct
import time

# Initialize LoRa in LORAWAN mode.
lora = LoRa(mode=LoRa.LORAWAN)

# create an ABP authentication params
dev_addr = struct.unpack(">l", binascii.unhexlify('26 XX XX AE'.replace(' ','')))[0]
nwk_swkey = binascii.unhexlify('A07061XXXX60D67F3XXXX28436D001C0'.replace(' ',''))
app_swkey = binascii.unhexlify('A89CE0XXXXECBCAD2F48F1XXXX6FCD81'.replace(' ',''))

# join a network using ABP (Activation By Personalization)
lora.join(activation=LoRa.ABP, auth=(dev_addr, nwk_swkey, app_swkey))

# remove all the non-default channels
for i in range(3, 16):
    lora.remove_channel(i)

# set the 3 default channels to the same frequency
lora.add_channel(0, frequency=868100000, dr_min=0, dr_max=5)
lora.add_channel(1, frequency=868300000, dr_min=0, dr_max=5)
lora.add_channel(2, frequency=868500000, dr_min=0, dr_max=5)
lora.add_channel(0, frequency=867100000, dr_min=0, dr_max=5)
lora.add_channel(1, frequency=867300000, dr_min=0, dr_max=5)
lora.add_channel(2, frequency=867500000, dr_min=0, dr_max=5)
lora.add_channel(0, frequency=867700000, dr_min=0, dr_max=5)
lora.add_channel(1, frequency=867900000, dr_min=0, dr_max=5)

# create a LoRa socket
s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)

# set the LoRaWAN data rate
s.setsockopt(socket.SOL_LORA, socket.SO_DR, 5)

# make the socket blocking
s.setblocking(False)


for i in range (200):
    s.send(b'PKT #' + bytes([1, 2, 3]))
    time.sleep(4)
    rx = s.recv(256)
    if rx:
        print(rx)
    time.sleep(6)
ex

I also tried removing the channel specifications like this:

from network import LoRa
import socket
import binascii
import struct
import time

# Initialize LoRa in LORAWAN mode.
lora = LoRa(mode=LoRa.LORAWAN)

# create an ABP authentication params
dev_addr = struct.unpack(">l", binascii.unhexlify('26 XX XX AE'.replace(' ','')))[0]
nwk_swkey = binascii.unhexlify('XXXXXX79F460XXXXXX8AD28436XXX1C0'.replace(' ',''))
app_swkey = binascii.unhexlify('XXXXXXE33XXXXXXD2F48F1F5CDXXXD81'.replace(' ',''))

# join a network using ABP (Activation By Personalization)
lora.join(activation=LoRa.ABP, auth=(dev_addr, nwk_swkey, app_swkey))

# create a LoRa socket
s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)

# set the LoRaWAN data rate
s.setsockopt(socket.SOL_LORA, socket.SO_DR, 5)

# make the socket blocking
s.setblocking(False)


for i in range (200):
    s.send(b'PKT #' + bytes([1, 2, 3]))
    time.sleep(4)
    rx = s.recv(256)
    if rx:
        print(rx)
    time.sleep(6)
ex

[miroslav.petrov]

@bucknall

Do you have any suggestions?

[gertjanvanhethof]

I updated my LoPy to the latest firmware and go the latest nano gateway sources from Pycom from github.
The issue is still there. Gateway is connected well but node is not able to connect to TNN. The join accept messages shown in the TTN console are received but PyMakr console still shows "Not joined".
Can you please fix this issue?

[rvandam]

@gertjanvanhethof I have the same problem with joining by OTAA.

Strangely it works after I do a reset of the nano gateway, so:

1. switch on the gateway (and wait a bit)
2. switch on the node --> not joining
3. reset the gateway --> now it works

I bet there is something wrong in the order the nano gateway handle things.

[hakan kayan]

I know this is a quite old topic, but I have the same issue. It seems like the issue does still persists.