Alex's Corner - Week 3 - LoPy LoRaWAN Nano-Gateway & TTN
jmarcelino last edited by jmarcelino
Where it says
"freq": 868.1should be
Then in your otaa_node.py remove all 3 lora.add_channel() lines and replace with
for channel in range(0, 72): lora.remove_channel(channel) lora.add_channel(0, frequency=915100000, dr_min=0, dr_max=4)
This is necessary for 915Mhz regions
palmy-nz last edited by palmy-nz
@bucknall I do, but device status still 'never seen'.
My device eui, app eui, and app key all match node main.py (from otaa_node.py)
Not sure about the application handler, currently set to ttn-handler-us-west? no au (aussie) option
Where could I be looking?
@palmy-nz looks fine :) - have you set up an application on the TTN yet?
palmy-nz last edited by
4(for 915mhz) did fix this ValueError.
Now I am just getting
Not joined yet
My gateway config.py looks like this
GATEWAY_ID = '70b3d54990c648be' SERVER = 'router.au.thethings.network' PORT = 1700 NTP = "pool.ntp.org" NTP_PERIOD_S = 3600 WIFI_SSID = '***' WIFI_PASS = '***' LORA_FREQUENCY = 915100000 LORA_DR = "SF7BW125" # DR_5
Anything glaringly obvious?
Data acquisition is definitely an interesting topic! I'll make sure it's on the list for Alex's Corner!
jmarcelino last edited by
For the 915Mhz region the dr_max parameter (LoRa datarate setting) has to be 4 and not 5.
You'll also need to change the nano gateway script to match the frequencies and channel, please see this thread https://forum.pycom.io/topic/983/otaa_node-py-error/3
palmy-nz last edited by palmy-nz
Hi Alex, thanks for these videos.
I managed to get the nano-gateway working, using the Packet Forwarder protocol and finding out my Device EUI with these commands
import network import binascii binascii.hexlify(network.LoRa().mac())
However, I could not get the node working with the otaa_node.py example. I am getting this error:
ValueError: invalid argument(s) value
On this line
lora.add_channel(0, frequency=915100000, dr_min=0, dr_max=5)
Note I am on the 915 frequency (New Zealand). Has to be something to do with that aye?
Any advice appreciated.
Ps. I would love to see in an upcoming video how to pull data from sensors, and also push to nodes e.g. trigger led/servo.
I've gotten around to pushing up the LoPy LoRaWAN Nano-Gateway Tutorial!
jmarcelino last edited by
TTN is saying the gateway "not connected" and other issues should be fixed early next week.
Peter Lans last edited by
Thank you Alex and all the people here on the forum.
Thanks to all the information provided here I managed to connect my Lopy as nano gateway to TTN. The frontpage detected it although my console tells me it is not connected. I guess that will be fixed at some point in time too.
But the data is coming through from de OTAA node, so I guess it works. It has to, because my Lopy is the only gateway around.
As I am completely new to lora, micropython and microprocessor programming, it is an exiting journey for me. But from here, I do have a great starting point to move on.
rskoniec last edited by
@rskoniec I'm also seeing those and I'm investigating the cause together with Espressif.
Sometimes I see series of
W (xxxxxxxxx) wifi: post pm rx bcn failedmessages on my LoRaWAN Nano Gateway:
Push ack Push ack Push ack W (147750288) wifi: post pm rx bcn failed W (147750288) wifi: post pm rx bcn failed Pull ack Pull ack Pull ack
With the newest f/w 1.6.10.b1 I'm still seeing these messages. @daniel Any news from Espressif?
I combined a couple of my tests / results of this weekend in another blog post titled "LoRaWAN + The Things Network = Still some love left". Which shows that this weekend was better than last week when I wrote "LoRaWAN + The Things Network = Tough Love or No Love ?" ;-)
gerkez last edited by
Thanks for your replies. I appreciate it a lot.
Who could have guessed that the ttn network / router was down?
Waited until today, have the same config as you described and guess what?
Today everything works. I'm happy, because now I have a gateway I can connect to without having to leave my house :-)
BTW, I just noticed that the LoPy Nano Gateway and node support downlink information....nice. :)
(now I just have to add some code on the client to actually do something with it and a payload function to do the encoding on the TTN side, see if only the TTN backbone works then testing is much more interesting).
pfff....until I get another upvote I am only allowed one post per 600 seconds...
While I was waiting to post, I had another look at the abp_node.py code in the examples folder:
for i in range (200):
s.send(b'PKT #' + bytes([i]))
rx = s.recv(256)
It might be worthwhile to explain somewhere that this node example script sends 200 packages and then stops.
Now, resetting will restart the node, but because the devices on TTN by default do "Frame Counter Checks", the backend will ignore the packages after the reset because the node will start at 1 again and the backend will see them as duplicates.
You can reset the frames counter for the device to fix this.
@gerkez It looks like the TTN backend is up again, so you should be able to get the LoPy Nano Gateway + the LoPy node working at the moment.
@gerkez Currently my LoPy shows the same error without changing anything since this morning.
There are reports on the TTN network about the EU-router currently being down: https://www.thethingsnetwork.org/forum/t/lorawan-routers-down/6393
(or at least reports of people not being able to connect), so better wait until tomorrow.
You should go for
Protocol: packet forwarder
Gateway EUI: should be the same as in the config.py
Description: think of something
Frequency Plan: Europe (if you are in Europe)
Location: pick your own house on the map
Antenna placement: indoors
After you create the gateway, in Settings there is also the option "Router" where at first nothing is selected, you can specifically set that to ttn-router-eu but AFAIK that doesn't matter.
For now, nothing to play / experiment with as long as the gateways are (apparently) down.
gerkez last edited by
I'm in exactly the same situation, latest firmware and so on.
After watching the video, I set up my lopy to act as a nano gateway and thanks to your post, I created a packet forwarder gateway at TTN in stead of the gateway connector. I actually tried both of them.
At this moment I have a packet forwarder gateway, but I'm wondering whether I should choose a router.
In the video, Alex doesn't choose a router when he adds the gateway, but later on you see the "router.eu.thethings.network" on the pre configured gateway. I wonder where that one comes from.
I know it's the same one as in the config.py file, but should I enter this one while adding the gateway at TTN or not?
It looks like the script is running; I get the push ack's and pull ack's, but no connection with TTN
At the TTN console, I get messages like: "could not subscribe to gateway status. NOC connection timed out" and "Status not connected".
Is this going to work?
I really need a gateway, because there isn't one in my vicinity.
@bucknall Hi Alex,
Thanks, that would be much appreciated. I understand that stuff related to the TTN backend is out of your control but anything that can make it more clear were the problem lies would be great!
Hi @PiAir, I completely understand your frustration.
I was actually having concerns about calling off the demo as TTN was throwing some strange errors relating to viewing the gateway traffic. I believe they're making some changes as to how packet forwarding is working and that the gateway traffic feature is still under heavy development.
Looking back over the video, I see where the error was coming from; I'd accidentally selected Gateway Connector, under the protocol -
It should be Packet Forwarder and this was producing errors with the manner in which the nano-gateway connected to TTN.
What I will aim to do is to tidy up the example we have on the documentation and produce a step by step (with screenshots) as to how you can set up your nano-gateway.
I'll also modify Daniel's code to add a debug output that will hopefully make it easier to troubleshoot on the nano-gateway's side.
Apologies for the issues you've been running into, hopefully we can get them fixed shortly!
I am afraid that I just don't get it to work as expected.
First of all: in de video Alex creates a gateway connector. Because that one doesn't connect, he goes back to one he has already setup, but that (judging by the ID) is a packet forwarder. So which one should we use?
I tried the setup for both options, same result.
My LoPy has the most recent firmware installed:
MicroPython v1.8.6-535-g84855b2b on 2017-03-24; LoPy with ESP32
(sysname='LoPy', nodename='LoPy', release='1.6.9.b1', version='v1.8.6-535-g84855b2b on 2017-03-24', machine='LoPy with ESP32', lorawan='1.0.0')
It connects to my WiFi network without a problem (I can check because I can connect both over serial and over Wifi).
The only messages I got are:
Sometimes it trowed an:
W (83966) wifi: post pm rx bcn failed
However, the console showed "not connected" consistently. It never succeeded to connect.
I created a LoPy node, had no result either. I had a Marvin based node close by, did not connect via the gateway either.
Then suddenly, after about 3 hours of testing without result, packets started arriving, but the gateway still showed as not connected (as never having connected yet). I gave up and called it a night.
This morning when I got up, the TTN console showed the Gateway (I ended up with the Packet forwarder because Alex had two of those that appeared to be connected in his setup) very much online with signal coming in every 3 second.
The two nodes are also shown as online, but as in "6 hours ago". No data is coming in anymore, not visible in the console, but also not via the API, if I look a the application.
If I look at the LoPy gateway, it appears to still be receiving data from the LoPy node, but TTN is ignoring it?
In the end, the video did not really help, it did show that Alex had the same problems as the rest of us: he followed the steps that should lead to a working setup, failed.
But during the video, like magic, he had a previously prepared setup that worked without really explaining why that one worked and the other one didn't. I don't have that magic here.
Don't get me wrong, I really appreciate the effort, but either the LoPy is still not doing what it should do, or TTN is still to beta, but for someone that doesn't know the ins and outs of both, this still is impossible to get up and running reliably.
My question would be: can you make the gateway + node code more robust, or show us where to add debug information? So that I at least get a better idea of where to look for problems. Thanks!