LoRA OTAA nano gateway example error

[rafi021]

I have imported the exact code(OTAA node) given in lorawan nano gateway. But this code gives an ValueError: invalid argument(s) module on this given line. My Lopy module is running latest firmware 1.7.5.b1

lora.add_channel(0, frequency=915000000, dr_min=0, dr_max=5)

Please need help on this. What wrong i have made.

[jmarcelino]

For 915Mhz LoRaWAN regions the maximum dr (Data Rate index) is 4, so please use
lora.add_channel(0, frequency=915000000, dr_min=0, dr_max=4)

[rafi021]

hi @jmarcelino, thanks. it solve my problem. but otaa node does not get connected to ttn gateway(another lopy). it shows only not joined yet message all the time. I have edited the code with my device dev_eui,app_eui and app_key. but still no luck. likely my ttn gateway is connected with thingsnetwork. will you please help me to figure out where did I make mistake. should I post my code here?

[rafi021]

``""" OTAA Node example compatible with the LoPy Nano Gateway """

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

Initialize LoRa in LORAWAN mode.

lora = LoRa(mode=LoRa.LORAWAN)

create an OTA authentication params

dev_eui = binascii.unhexlify('00 E2 44 46 7D 5E 4A C0'.replace(' ',''))
app_eui = binascii.unhexlify('70 B3 D5 7E F0 00 5F F6'.replace(' ',''))
app_key = binascii.unhexlify('4B CD E4 AA A8 A6 14 13 4A BE 51 D8 38 AE 45 94'.replace(' ',''))

set the 3 default channels to the same frequency (must be before sending the OTAA join request)

lora.add_channel(0, frequency=915100000, dr_min=0, dr_max=4) #9232 00000
lora.add_channel(1, frequency=915100000, dr_min=0, dr_max=4)
lora.add_channel(2, frequency=915100000, dr_min=0, dr_max=4)

join a network using OTAA

lora.join(activation=LoRa.OTAA, auth=(dev_eui, app_eui, app_key), timeout=0)

wait until the module has joined the network

while not lora.has_joined():
time.sleep(2.5)
print('Not joined yet...')

remove all the non-default channels

for i in range(3, 16):
lora.remove_channel(i)

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, 4)

make the socket blocking

s.setblocking(False)

time.sleep(5.0)

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

[jmarcelino]

Yes that code won't work for the US915Mhz region, it's meant for Europe 868 where there are only 3 default channels.

Please use this helpful guide by a community member on how to connect both your nano gateway and node properly. Use the code he provides for both the gateway and node:

https://seasluglabs.io/blogs/guides/the-things-network-us-setup-with-lopy-as-a-nano-gateway-and-lopy-node

You may also find this topic in the forums helpful, it's what lead to that post: https://forum.pycom.io/topic/1284/problem-pairing-otaa-node-to-nano-gateway-in-us-ttn/

If you have any questions please post there.

[Bucknalla]

Thanks for supporting this @jmarcelino, I'll get the seaslug tutorial up onto our own documentation in the near future as well.