# TTN & GPRS: dealing with the latency

**URL:** <https://www.thethingsnetwork.org/forum/t/ttn-gprs-dealing-with-the-latency/32763>\
**Category:** TTN Network and Services\
**Created:** [December 18, 2019, 12:19pm UTC](https://www.thethingsnetwork.org/forum/t/ttn-gprs-dealing-with-the-latency/32763 "2019-12-18T12:19:09Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![arjanvanb](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/arjanvanb/32/46626_2.png) [@arjanvanb](https://www.thethingsnetwork.org/forum/u/arjanvanb)\
**Post date:** [December 18, 2019, 7:18pm UTC](https://www.thethingsnetwork.org/forum/t/ttn-gprs-dealing-with-the-latency/32763/15 "2019-12-18T19:18:37Z")

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Just as a reference, from some posts that I undeleted just now:

In August 2017, in [Multiple new devices trying to OTAA - #17 by kersing](https://www.thethingsnetwork.org/forum/t/multiple-new-devices-trying-to-otaa/8813/17) one of the developers wrote:

> [@Multiple new devices trying to OTAA](https://www.thethingsnetwork.org/forum/t/multiple-new-devices-trying-to-otaa/8813/18):
>
> The only reason we queue on the network side, is because some gateways don’t have enough memory to fit more than one scheduled message.

In December 2017 some timing was changed from 800ms to 1000ms:

> [@MatchX no TX](https://www.thethingsnetwork.org/forum/t/matchx-no-tx/11240/36):
>
> I just added another 200ms ([`c8bd97b135`](https://github.com/TheThingsNetwork/ttn/commit/c8bd97b135ca4920b09b9b28df025c1376bdec53)) to increase support for slow connections (or slow gateways).

I don’t fully grasp [the code that handles this](https://github.com/TheThingsNetwork/ttn/blob/master/core/router/gateway/schedule.go).

And dating back to April 2017:

> [@Kerlink downlink issue](https://www.thethingsnetwork.org/forum/t/kerlink-downlink-issue/3089/17):
>
> You can get a queuing packet forwarder for Kerlink at [this site](http://office.the-box.com/) You will need to put the files at the correct location on the Kerlink yourself. Supports both the new TTN protocol and the Semtech protocol.

@kersing, is this still valid, and do you think that TTN would know that the gateway has such queue?

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