# Lopy4 nanogateway loses some downlinks from TTN

**URL:** <https://forum.core-electronics.com.au/t/lopy4-nanogateway-loses-some-downlinks-from-ttn/7909>\
**Category:** Wireless/RF\
**Created:** [23 June 2020 20:30 UTC](https://forum.core-electronics.com.au/t/lopy4-nanogateway-loses-some-downlinks-from-ttn/7909 "2020-06-23T20:30:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Jairo91041](https://avatars.discourse-cdn.com/v4/letter/j/f04885/32.png) [@Jairo91041](https://forum.core-electronics.com.au/u/Jairo91041)\
**Post date:** [23 June 2020 20:30 UTC](https://forum.core-electronics.com.au/t/lopy4-nanogateway-loses-some-downlinks-from-ttn/7909/1 "2020-06-23T20:30:27Z")

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Hi, I am trying to receive downlinks from TTN but sometimes I miss some of them, I am using the BL072Z board as node and LoPy4 as the gateway, uplinks work ok, the issue is with the downlinks, the TTN terminal shows the downlink was received but it is not received by my node, thanks

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**Author:** ![Oliver](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/oliver/32/3315_2.png) [@Oliver](https://forum.core-electronics.com.au/u/Oliver)\
**Post date:** [24 June 2020 08:23 UTC](https://forum.core-electronics.com.au/t/lopy4-nanogateway-loses-some-downlinks-from-ttn/7909/2 "2020-06-24T08:23:50Z")

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Hi Jairo,

I’ve done some googling - looks like you’ve been trying to resolve this for a while!

> **[Downlinks from TTN in BL072Z with SF12 and LoPy4 not working?](https://www.thethingsnetwork.org/forum/t/downlinks-from-ttn-in-bl072z-with-sf12-and-lopy4-not-working/29467)**
>
> Hi, i am making some tests with my BL072Z board, with SF7 uplinks and downlinks are ok, but when i run the code with SF12 i only can send uplinks, in TTN i can see the scheduled downlink and in the next uplink the downlink is sent but in the BL072Z...

  
[https://community.st.com/s/question/0D50X0000BGlHHNSQ3/why-i-cant-receive-downlinks-messages-from-ttn-in-bl072z-lora-board-with-sf12-and-lopy4-single-channel-gateway](https://community.st.com/s/question/0D50X0000BGlHHNSQ3/why-i-cant-receive-downlinks-messages-from-ttn-in-bl072z-lora-board-with-sf12-and-lopy4-single-channel-gateway)  
[https://community.st.com/s/question/0D50X0000AixmVZSQY/bl072z-number-guessing-example-resets-the-join-to-the-network-ttn](https://community.st.com/s/question/0D50X0000AixmVZSQY/bl072z-number-guessing-example-resets-the-join-to-the-network-ttn)

I don’t have a lot of experience with LoRA myself, but someone else can probably jump in with some info. For reference, looks like these are your bits:

> **[B-L072Z-LRWAN1 - STMicroelectronics](https://www.st.com/en/evaluation-tools/b-l072z-lrwan1.html)**
>
> B-L072Z-LRWAN1 - STM32L0 Discovery kit LoRa, Sigfox, low-power wireless, B-L072Z-LRWAN1, STMicroelectronics

  

> **[b-l072z-lrwan1.pdf](https://www.st.com/resource/en/data_brief/b-l072z-lrwan1.pdf)**
>
> 0 B

> **[Pycom LoPy4 (LoRaWAN)](https://core-electronics.com.au/pycom-lopy4.html)**
>
> The LoPy4 is a quadruple bearer MicroPython enabled development board (LoRa, Sigfox, WiFi, Bluetooth) – perfect enterprise-grade IoT platform for your connected Things. With the latest Espressif chipset the LoPy4 offers a perfect combination of...