Activation Lopy with TTN network using OTAA method



  • Hello!

    Still unclear for me how I can connect Lopy to TTN network using OTAA method.
    I was able to get connection only using ABP method w/o problem but OTAA have never worked for me.

    Please advice.
    Thank you



  • @oorrab
    in application log I can see channels actually keep changing starting from 9039...



  • @asavvin interesting you set all the channels to the same frequency. Something for me to try to help narrow this down. Frequencies different in AUS but his may take LoPy complexity out of the equation to make progress....



  • @oorrab
    Hi

    I used Pycom Lopy with latest firmware. TTN gateway with original firmware.

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

    lora = LoRa(mode=LoRa.LORAWAN, region=LoRa.US915)

    dev_eui = binascii.unhexlify('xxxx')
    app_eui = binascii.unhexlify('xxxx')
    app_key = binascii.unhexlify('xxxx')

    for channel in range(0, 72):
    lora.add_channel(channel, frequency=903900000, dr_min=0, dr_max=3)

    join a network using OTAA

    lora.join(activation=LoRa.OTAA, auth=(dev_eui, app_eui, app_key), timeout=0, dr=4)

    wait until the module has joined the network

    join_wait = 0
    while True:
    time.sleep(2.5)
    if not lora.has_joined():
    print('Not joined yet...')
    join_wait += 1
    if join_wait == 5:
    lora.join(activation=LoRa.OTAA, auth=(dev_eui, app_eui, app_key), timeout=0, dr=0)
    join_wait = 0
    else:
    break

    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, 0)

    make the socket blocking

    s.setblocking(False)

    time.sleep(5.0)

    for i in range (200):
    pkt = b'PKT #' + bytes([i])
    print('Sending:', pkt)
    s.send(pkt)
    time.sleep(4)
    rx, port = s.recvfrom(256)
    if rx:
    print('Received: {}, on port: {}'.format(rx, port))
    time.sleep(6)



  • Hi @asavvin - could you share your code and firmware version?

    Might have some differences here in AUS but would be good to know a working baseline and rule out some unknowns.



  • @asavvin said in Activation Lopy with TTN network using OTAA method:

    Hello!

    Still unclear for me how I can connect Lopy to TTN network using OTAA method.
    I was able to get connection only using ABP method w/o problem but OTAA have never worked for me.

    Please advice.
    Thank you

    Finally I was able to get connection Lopy using OTAA with TTN gateway in US915.



  • @oorrab I don't use TTN, I deploy my own gateways which operate of frequencies outside of TTN for obvious reasons.

    My node setup "up" channels replicate my Gateway 'RX" channels, if the mote or node is broadcasting on any channels outside of what the gateway is set to listen on then it will fall on deaf ears so to speak.



  • Thanks for the reply @jimpower

    I put in the print statements (output below) to check the maths/python, but can easily be missing something radio-esque! Indeed, these are spec'd for gateways at;
    https://www.thethingsnetwork.org/forum/t/ttn-australian-communities/4068/9

    The node config should replicate right? Nothing to switch as a node vs gateway?

    AU ISM 915
    Ch# | direc | f/MHz | BW/kHz | data rate
    8 | up | 916.8 | 125 | DR0 - DR3
    9 | up | 917.0 | 125 | DR0 - DR3
    10 | up | 917.2 | 125 | DR0 - DR3
    11 | up | 917.4 | 125 | DR0 - DR3
    12 | up | 917.6 | 125 | DR0 - DR3
    13 | up | 917.8 | 125 | DR0 - DR3
    14 | up | 918.0 | 125 | DR0 - DR3
    15 | up | 918.2 | 125 | DR0 - DR3
    65 | up | 917.5 | 500 | DR4
    0 | down | 923.3 | 500 | DR8 - DR13
    1 | down | 923.9 | 500 | DR8 - DR13
    2 | down | 924.5 | 500 | DR8 - DR13
    3 | down | 925.1 | 500 | DR8 - DR13
    4 | down | 925.7 | 500 | DR8 - DR13
    5 | down | 926.3 | 500 | DR8 - DR13
    6 | down | 926.9 | 500 | DR8 - DR13
    7 | down | 927.5 | 500 | DR8 - DR13

    Adding channels...
    Adding channel: 8
    Frequency: 916800000
    Adding channel: 9
    Frequency: 917000000
    Adding channel: 10
    Frequency: 917200000
    Adding channel: 11
    Frequency: 917400000
    Adding channel: 12
    Frequency: 917600000
    Adding channel: 13
    Frequency: 917800000
    Adding channel: 14
    Frequency: 918000000
    Adding channel: 15
    Frequency: 918200000
    Adding channel 65
    Frequency: 917500000
    Adding channel 0
    Frequency: 923300000
    Adding channel 1
    Frequency: 923900000
    Adding channel 2
    Frequency: 924500000
    Adding channel 3
    Frequency: 925100000
    Adding channel 4
    Frequency: 925700000
    Adding channel 5
    Frequency: 926300000
    Adding channel 6
    Frequency: 926900000
    Adding channel 7
    Frequency: 927500000



  • I am in US915



  • @oorrab said in Activation Lopy with TTN network using OTAA method:

    for i in range(16, 65):
    print("Removing channel:", i)
    lora.remove_channel(i)
    for i in range(66, 72):
    print("Removing channel:", i)
    lora.remove_channel(i)

    print("Adding channels...")
    for i in range(8, 16):
    print("Adding channel:", i)
    f = 915200000 + i * 200000
    print("Frequency:", f)
    lora.add_channel(i, frequency=f, dr_min=0, dr_max=3)

    print("Adding channel 65")
    f = 917500000
    print("Frequency:", f)
    lora.add_channel(65, frequency=f, dr_min=4, dr_max=4)

    for i in range(0, 8):
    print("Adding channel ", i)
    f = 923300000 + i * 600000
    print("Frequency:", f)
    lora.add_channel(i, frequency=f, dr_min=0, dr_max=6)

    I could be wrong but looking at your code adding the channels back in your sub band 2 should be ch 8-15 and they start at 916.8 - 918.2, yours looks like you are starting from 915.2 try adjusting these and let us know your results.



  • Hi,

    search over the forum. Still unclear if this is possible to use OTAA activation for US915 Lopy with TTN gateway. Does anybody have success?



  • @jmarcelino - similar issue, but in AUS

    Failing to connect LoPy1 node to TTN in Australia (Adelaide) with OTAA. New to LoRa and LoPy so have plenty of unknowns :)

    Haven't managed to find a definite LoPy/TTN setup description for AU915 that works, but am attempting to set frequencies/channel-plan as per;
    https://www.thethingsnetwork.org/forum/t/ttn-australian-communities/4068

    os.uname()
    (sysname='LoPy', nodename='LoPy', release='1.17.3.b1', version='v1.8.6-849-83e2f7f on 2018-03-19', machine='LoPy with ESP32', lorawan='1.0.2')

    If I delete all channels and re-add, lora.join with timeout=0 does not return (appears to hang). Deleting extra channels and updating those needed appears to be OK.

    Is there a way of confirming all channel settings?

    Trying to spec a dr_max > 6 (for AU) gives a value error - is this expected, and does it matter for a basic join?

    main.py as follows;

    from network import LoRa
    import socket
    import time
    import binascii
    import pycom
    
    lora = LoRa(mode=LoRa.LORAWAN, region=LoRa.AU915, adr=False, tx_retries=0, device_class=LoRa.CLASS_A)
    
    for i in range(16, 65):
        print("Removing channel:", i)
        lora.remove_channel(i)
    for i in range(66, 72):
        print("Removing channel:", i)
        lora.remove_channel(i)
    
    print("Adding channels...")
    for i in range(8, 16):
        print("Adding channel:", i)
        f = 915200000 + i * 200000
        print("Frequency:", f)
        lora.add_channel(i, frequency=f, dr_min=0, dr_max=3)
    
    print("Adding channel 65")
    f = 917500000
    print("Frequency:", f)
    lora.add_channel(65, frequency=f, dr_min=4, dr_max=4)
    
    for i in range(0, 8):
        print("Adding channel ", i)
        f = 923300000 + i * 600000
        print("Frequency:", f)
        lora.add_channel(i, frequency=f, dr_min=0, dr_max=6)
    
    app_eui = binascii.unhexlify('70B3DAAAAAA0BBA1')
    app_key = binascii.unhexlify('BC1186924E6EAAAAAAAAE995921392C7')
    
    lora.join(activation=LoRa.OTAA, auth=(app_eui, app_key), timeout=0)
    
    while not lora.has_joined():
        time.sleep(2.5)
        print('Not yet joined...')
    

    Also tried the above with the channel removes only (no adds to try the defaults) with no avail.

    Any advice on troubleshooting this further? Have tested on several gateways and driven pretty close so shouldn't have a range issue. Node running with PyCom antenna.

    As an aside - it would be awesome to add a LoRa.AU915.TTN to handle this - looks like the Aus TTN community is fairly well coordinated on this sub-band2 setup. Perhaps a non-issue if there is a solid LoPy-Aus-TTN setup guide somewhere. I'll create one if I can get to the bottom of it!



  • This post is deleted!


  • @jmarcelino
    Hi,

    I am @North America and I am using
    TTN Gateway https://shop.thethingsnetwork.com/
    and Lopy

    Thank you



  • Hello @asavvin
    What kind of gateway do you have?

    Also what's your country/LoRa region?


 

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