Unable to receive downlink messages from V3 application to V2 gateway

TTN V2 to V3 Upgrade
1

I have same issues with a device registered in V3 communicating over a gateway registered to V2. To my understanding, this should be supported.

In V2 I can send multiple messages, uplink and downlink work.

Moving the device to V3, I can send one message and downlinks don’t work. I do receive the first message though.

What I noticed is that in the V2 console’s traffic log of the gateway, I cannot see the downlink message which the V3 console claims it has sent. Taking a look at the downlink queue, the message was queued first, then gets removed. So I guess TTNv3 thinks it has sent the message.

2

That is expected behavior. Only messages sent by V2 applications will be visible. And all uplinks.

3

Yea, that is rather confusing.

In the end we did find the issue. It looks like TTN v3 changed the RX1 delay from 1 second to 5 seconds. Which broke the communication.

5

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