# Lose Downlink Queue (TTN Stack v3) **URL:** \ **Category:** The Things Stack v3\ **Created:** [May 3, 2020, 12:55pm UTC](https://www.thethingsnetwork.org/forum/t/lose-downlink-queue-ttn-stack-v3/36687 "2020-05-03T12:55:33Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Njabulo](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/njabulo/32/36273_2.png) [@Njabulo](https://www.thethingsnetwork.org/forum/u/Njabulo)\ **Post date:** [May 3, 2020, 12:55pm UTC](https://www.thethingsnetwork.org/forum/t/lose-downlink-queue-ttn-stack-v3/36687/1 "2020-05-03T12:55:34Z")
Hi everyone, I am using MQTT to schedule downlink messages to the end device. The device is able to get some messages however, it seems as if some messages are getting dropped on the queue. Can anyone please help me out, what could be the reason for this message. ![Screenshot from 2020-05-03 14-35-52](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/c/4/c4730df08001a719cc17c5490ffe17bad1ed6e3f.png) ---
**Author:** ![iiLaw](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/iilaw/32/35724_2.png) [@iiLaw](https://www.thethingsnetwork.org/forum/u/iiLaw)\ **Post date:** [May 4, 2020, 9:27am UTC](https://www.thethingsnetwork.org/forum/t/lose-downlink-queue-ttn-stack-v3/36687/2 "2020-05-04T09:27:00Z")
What version of TTI you on? Is your device class A or C? I’ve tested class c on v3.7.2 all works well also check Gateway log Also you can subscribe to these topics might help - `v3/{application id}/devices/{device id}/down/queued` - `v3/{application id}/devices/{device id}/down/sent` - `v3/{application id}/devices/{device id}/down/ack` - `v3/{application id}/devices/{device id}/down/nack` - `v3/{application id}/devices/{device id}/down/failed` // Gateway log 10:45:58 femto-80029c09dd51 send downlink message 10:45:58 femto-80029c09dd51 transmit downlink message successful ---
**Author:** ![adrianmares](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/adrianmares/32/45383_2.png) [@adrianmares](https://www.thethingsnetwork.org/forum/u/adrianmares)\ **Post date:** [May 5, 2020, 2:31pm UTC](https://www.thethingsnetwork.org/forum/t/lose-downlink-queue-ttn-stack-v3/36687/3 "2020-05-05T14:31:32Z")
Would you kindly provide the stack logs at the time of scheduling ? We need more details in order to pinpoint the cause of queue drop. ---
**Author:** ![Njabulo](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/njabulo/32/36273_2.png) [@Njabulo](https://www.thethingsnetwork.org/forum/u/Njabulo)\ **Post date:** [May 5, 2020, 5:00pm UTC](https://www.thethingsnetwork.org/forum/t/lose-downlink-queue-ttn-stack-v3/36687/4 "2020-05-05T17:00:52Z")
@iiLaw I use the TTN Stack v3.5.2. On my end device I use class A and I did not activate Class C on my backend. I also will try to implement the other mqtt topics, that will also help me out thanks. @adrianmares I have been looking for a way to view logs, I only see them on my console only. Where are they stored? ---
**Author:** ![iiLaw](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/iilaw/32/35724_2.png) [@iiLaw](https://www.thethingsnetwork.org/forum/u/iiLaw)\ **Post date:** [May 6, 2020, 9:57am UTC](https://www.thethingsnetwork.org/forum/t/lose-downlink-queue-ttn-stack-v3/36687/5 "2020-05-06T09:57:22Z")
I would upgrade to v3.7.2 I found 3.5x not good with down links or class C Or may be wait as I think downlinks in Console is very close to release ---
**Author:** ![adrianmares](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/adrianmares/32/45383_2.png) [@adrianmares](https://www.thethingsnetwork.org/forum/u/adrianmares)\ **Post date:** [May 6, 2020, 6:54pm UTC](https://www.thethingsnetwork.org/forum/t/lose-downlink-queue-ttn-stack-v3/36687/6 "2020-05-06T18:54:32Z")
The console/docker logs are fine, we are currently only logging to console (since then other specialized tools may pick up the logs from there, instead of us reinventing the wheel). However, I would indeed advise you to upgrade your instance after running a backup and see if the newer versions help. ---
**Author:** ![Njabulo](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/njabulo/32/36273_2.png) [@Njabulo](https://www.thethingsnetwork.org/forum/u/Njabulo)\ **Post date:** [May 6, 2020, 7:26pm UTC](https://www.thethingsnetwork.org/forum/t/lose-downlink-queue-ttn-stack-v3/36687/7 "2020-05-06T19:26:55Z")
Let me upgrade to v3.7.2, if then the same thing happens I will come back to you guys, thanks. ---
**Author:** ![system](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/6/2/6250ea44fd2b0d6259489e1a92748df681e1f970.png) [@system](https://www.thethingsnetwork.org/forum/u/system)\ **Post date:** [June 2, 2020, 12:55pm UTC](https://www.thethingsnetwork.org/forum/t/lose-downlink-queue-ttn-stack-v3/36687/8 "2020-06-02T12:55:37Z")
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