2 nodes, 1 application -- second node never works

Gateways TTKG - The Things Kickstarter Gateway
1

I am using the TTN Gateway (US915) purchased from Newark updated to 1.04 beta firmware.

First I tried to have both nodes connected to the same application but only one would work. I made sure that each node has a unique deveui and appkey but the same appeui. It was always to first to join that continued to function. It didn’t matter which node joined first.

In each node I am using the LMIC library installed directly from the Library Manager of the Arduino IDE.

After messing around for several days I decided to try creating an application for each device. Now both nodes are working as expected.

Node info

  1. Feather M0 RFM95, transmitting every 5 min, “Hello World” payload, 46mS tx time, SF7BW125, rssi -49
  2. Anarduino RFM95, transmitting every 1 min, “Hello World” payload, 46mS tx time, SF7BW125, rssi -51

The TTN Gateway has been a nightmare with reboots and weird problems so perhaps there are issues there. I have a RAK831 and LorixOne in route so in a week or two I’ll be able to eliminate the doubts I have regarding the gateway.

I am really new to lorawan but I expected to be able to connect many devices to the same application. Any insight or tips?

2

if both nodes are working with a separate application, the nodes seems to work and your TTN gateway too.

So I suggest

  • create a new application with a different name then the first one.

  • remove both nodes from the 2 applications

  • add the nodes again to that new application

  • and make sure you’ve set the right frequencies in your (lmic) code

3

try to check relax frame counter from ttn application

4
  1. Eliminated all devices and applications
  2. Created a new application and 2 new devices

Saw the TTN gw rebooting!?

Both devices join but no data.

Eliminating the second device…first device joins and send data successfully.

Adding a second device…joined after many fails…but doesn’t send data…TTN gw reboots.

5

that is very strange behavior.

can you show some console captures from these events pls like each node joining and transmitting data to the new application ?

I suspect the nodes to be honest… keys and/or lmic config errors

6

I tried to send the info requested but as soon as I add a second node the TTN GW just reboots.
When a node works it tries to join, then it joins successfully, then queues a packet and sends the packet. There are no errors on the node side. The gw should not be rebooting like this no matter what the nodes are sending it.

I will wait for the new gateways that should be arriving next week.
Supposedly there is a new update for the ttn gw in “week 30” which is the end of July.

7

ok success :sunglasses: