# Downlink confirmation stuck?

**URL:** <https://www.thethingsnetwork.org/forum/t/downlink-confirmation-stuck/25673>\
**Category:** Uncategorized\
**Created:** [May 4, 2019, 2:31pm UTC](https://www.thethingsnetwork.org/forum/t/downlink-confirmation-stuck/25673 "2019-05-04T14:31:24Z")\
**Posts on this page:** 10\
**Page:** 1

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**Author:** ![darkman](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/darkman/32/44267_2.png) [@darkman](https://www.thethingsnetwork.org/forum/u/darkman)\
**Post date:** [May 4, 2019, 2:31pm UTC](https://www.thethingsnetwork.org/forum/t/downlink-confirmation-stuck/25673/1 "2019-05-04T14:31:24Z")

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I don’t get this, it looks like device recieves downlink but doesent confirm it? or is trying to confirm to gateway out of react atm?  
 ![Screenshot_20190504_162952](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/f/b/fbb748321dbd4ab7b5fb45b840b1fd25282fb5d0.png)

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**Author:** ![jezd](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/jezd/32/46461_2.png) [@jezd](https://www.thethingsnetwork.org/forum/u/jezd)\
**Post date:** [May 4, 2019, 4:04pm UTC](https://www.thethingsnetwork.org/forum/t/downlink-confirmation-stuck/25673/2 "2019-05-04T16:04:58Z")

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Which LMIC library are you using?

Lots of us are having this issue too.

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**Author:** ![darkman](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/darkman/32/44267_2.png) [@darkman](https://www.thethingsnetwork.org/forum/u/darkman)\
**Post date:** [May 4, 2019, 4:07pm UTC](https://www.thethingsnetwork.org/forum/t/downlink-confirmation-stuck/25673/3 "2019-05-04T16:07:45Z")

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lmic-arduino I think. cant really say right now, device is remote… worked fine on table.

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**Author:** ![jezd](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/jezd/32/46461_2.png) [@jezd](https://www.thethingsnetwork.org/forum/u/jezd)\
**Post date:** [May 4, 2019, 4:13pm UTC](https://www.thethingsnetwork.org/forum/t/downlink-confirmation-stuck/25673/4 "2019-05-04T16:13:12Z")

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Is ADR turned on? this is what triggers the cycle of downlink/confirms - I’m still unclear if its the LMIC library issue or something on TTN backend that has changed recently

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**Author:** ![darkman](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/darkman/32/44267_2.png) [@darkman](https://www.thethingsnetwork.org/forum/u/darkman)\
**Post date:** [May 4, 2019, 4:29pm UTC](https://www.thethingsnetwork.org/forum/t/downlink-confirmation-stuck/25673/5 "2019-05-04T16:29:04Z")

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hm. SF fixed .

could be something about spread factor…

```
// Disable link check validation
LMIC_setLinkCheckMode(0);

// TTN uses SF9 for its RX2 window.
LMIC.dn2Dr = DR_SF9;

// Set data rate and transmit power for uplink (note: txpow seems to be ignored by the library)
LMIC_setDrTxpow(DR_SF9,14);
```

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<div class="post-metadata">

**Author:** ![jezd](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/jezd/32/46461_2.png) [@jezd](https://www.thethingsnetwork.org/forum/u/jezd)\
**Post date:** [May 4, 2019, 4:30pm UTC](https://www.thethingsnetwork.org/forum/t/downlink-confirmation-stuck/25673/6 "2019-05-04T16:30:44Z")

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is ADR on or off?

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**Author:** ![darkman](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/darkman/32/44267_2.png) [@darkman](https://www.thethingsnetwork.org/forum/u/darkman)\
**Post date:** [May 4, 2019, 4:31pm UTC](https://www.thethingsnetwork.org/forum/t/downlink-confirmation-stuck/25673/7 "2019-05-04T16:31:41Z")

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for what I can see… its not on

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**Author:** ![simzik](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/simzik/32/36834_2.png) [@simzik](https://www.thethingsnetwork.org/forum/u/simzik)\
**Post date:** [May 13, 2019, 7:11am UTC](https://www.thethingsnetwork.org/forum/t/downlink-confirmation-stuck/25673/8 "2019-05-13T07:11:57Z")

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I had the same problem using ttgo v1. The device was not able to receive downlink but was sending uplink without problems. I used the same code on two different devices and it was working on one, but not working on the other one. Maybe you try your code on a different device. The message in TTN only means, that you send a downlink with the confirmation request. It does not say that it was well received. The green button ack is missing.

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**Author:** ![darkman](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/darkman/32/44267_2.png) [@darkman](https://www.thethingsnetwork.org/forum/u/darkman)\
**Post date:** [May 14, 2019, 3:27pm UTC](https://www.thethingsnetwork.org/forum/t/downlink-confirmation-stuck/25673/9 "2019-05-14T15:27:06Z")

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yup… It was signal problem. I added bigger antenna and now it’s ok. (it’s in a bunker two miles away from concentrator). But I also don’t get it… it has strength to send signal, and all 4 my concentrators can hear it well… but cannot recieve it…

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**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:** [July 13, 2019, 3:27pm UTC](https://www.thethingsnetwork.org/forum/t/downlink-confirmation-stuck/25673/10 "2019-07-13T15:27:08Z")

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