# Problem downlink and communication **URL:** \ **Category:** Dragino\ **Created:** [June 13, 2022, 4:28am UTC](https://www.thethingsnetwork.org/forum/t/problem-downlink-and-communication/57493 "2022-06-13T04:28:59Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![sandraaritium](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/sandraaritium/32/35697_2.png) [@sandraaritium](https://www.thethingsnetwork.org/forum/u/sandraaritium)\ **Post date:** [June 13, 2022, 4:29am UTC](https://www.thethingsnetwork.org/forum/t/problem-downlink-and-communication/57493/1 "2022-06-13T04:29:00Z")
Hi everyone, I have 7 gateways (Multitech Conduit connected by GSM) installed in a hospital and 25 dragino RS485LN converters. The Network Server that I am using is The Things Stack V3 (I have my own instance in the cloud). All my devices are connected by ABP and they are sending a message each minute. I have two problems: 1. The uplinks are received by the application correctly, but suddenly, the messages continue to arrive at the gateway but not at the application.This is the configuration of the device: ![image](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/b/2/b2e74acf438b2ec6678ac992daff8bfeae05da4e.png) ![image](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/1/f/1fc4201b0f330f877654ccf0791d54f0a02974e4.png) ![image](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/c/e/ced77cc58f00ea465e4038eaedbb8c8c023cb52c.png) 1. For other hand, I can’t send downlink to the device. I have spoken with the people of dragino and they have indicated me that it has to be a downlink with confirmation. I have tried it with a gateway and a device in my office and it works ok, but when I try it in the real installation it doesn’t work, the downlik is sent repeatedly and the configuration of the device doesn’t change. Thanks in advanced Sandra ---
**Author:** ![Johan\_Scheepers](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/johan_scheepers/32/48536_2.png) [@Johan\_Scheepers](https://www.thethingsnetwork.org/forum/u/Johan_Scheepers)\ **Post date:** [June 13, 2022, 5:01am UTC](https://www.thethingsnetwork.org/forum/t/problem-downlink-and-communication/57493/2 "2022-06-13T05:01:29Z")
> [@sandraaritium](#): > > connected by GSM Have you looked at the latency between the gateway and NS? ---
**Author:** ![sandraaritium](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/sandraaritium/32/35697_2.png) [@sandraaritium](https://www.thethingsnetwork.org/forum/u/sandraaritium)\ **Post date:** [June 13, 2022, 7:05am UTC](https://www.thethingsnetwork.org/forum/t/problem-downlink-and-communication/57493/3 "2022-06-13T07:05:07Z")
Hi Johan, Thanks for your answer and sorry for the ignorance, but how can I measure the latency between the gateway and NS? Regards Sandra ---
**Author:** ![Johan\_Scheepers](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/johan_scheepers/32/48536_2.png) [@Johan\_Scheepers](https://www.thethingsnetwork.org/forum/u/Johan_Scheepers)\ **Post date:** [June 13, 2022, 7:24am UTC](https://www.thethingsnetwork.org/forum/t/problem-downlink-and-communication/57493/4 "2022-06-13T07:24:55Z")
You will need to insert your GSM sim card in a GSM router, and then connect your PC to it. Run a test from there. You need to be at the same location as the gateway. I have see with our local GSM providers the latency to the NS over 3.5 sec, but it varies from day to day as well. > **[AWS Ping Test (Latency) | Cloud Ping Test](https://cloudpingtest.com/aws)** > > Test ping time for different AWS (Amazon Web Services) regions from your web browser > **[AWS latency test](https://ping.psa.fun/)** > > AWS Latency test > **[AWS Cloud Ping - Latency & Response Speed Test](https://www.cloudping.cloud/aws)** > > This online tool estimates the network latency from your browser to Amazon Web Services (AWS) EC2 data centers around the world. ---
**Author:** ![sandraaritium](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/sandraaritium/32/35697_2.png) [@sandraaritium](https://www.thethingsnetwork.org/forum/u/sandraaritium)\ **Post date:** [June 13, 2022, 8:20am UTC](https://www.thethingsnetwork.org/forum/t/problem-downlink-and-communication/57493/5 "2022-06-13T08:20:57Z")
Hi @Johan_Scheepers, Thanks, I need to go to the hospital to do the test. The question is, if I have a big latency, what is the solution? Regards Sandra ---
**Author:** ![Johan\_Scheepers](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/johan_scheepers/32/48536_2.png) [@Johan\_Scheepers](https://www.thethingsnetwork.org/forum/u/Johan_Scheepers)\ **Post date:** [June 13, 2022, 8:24am UTC](https://www.thethingsnetwork.org/forum/t/problem-downlink-and-communication/57493/6 "2022-06-13T08:24:37Z")
What do you see in the console under the gateway and application exactly? Change the back haul, ADSL, fiber?