# Accelerometer downlink activation

**URL:** <https://www.thethingsnetwork.org/forum/t/accelerometer-downlink-activation/66348>\
**Category:** Generic Node\
**Created:** [January 15, 2024, 10:14am UTC](https://www.thethingsnetwork.org/forum/t/accelerometer-downlink-activation/66348 "2024-01-15T10:14:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![CNA](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/cna/32/35697_2.png) [@CNA](https://www.thethingsnetwork.org/forum/u/CNA)\
**Post date:** [January 15, 2024, 10:14am UTC](https://www.thethingsnetwork.org/forum/t/accelerometer-downlink-activation/66348/1 "2024-01-15T10:14:20Z")

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Hello all,

I can’t seem to access accelerometer data on the Generic Node.

Anytime I try send the downlink message on Fport 03 as per the [page](https://www.genericnode.com/docs/applications/se-vanilla/downlinks/) it doesn;t work.

I’ve tried pressing the button and then pressing sending the downlink (as per instructions:

> "…please remember that LoRaWAN class A devices can only receive a downlink when they transmit and uplink.)

I also sometimes see the error  
`no decoder defined for codec `{codec\_id}`.`

I am struggling to find the downlink payload formatter on the doc to include the accelerometer. Also same issue occurs for testing the buzzer/LED.

Thanks in advance again,

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**Author:** ![cndrxn](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/cndrxn/32/44659_2.png) [@cndrxn](https://www.thethingsnetwork.org/forum/u/cndrxn)\
**Post date:** [January 23, 2024, 8:36am UTC](https://www.thethingsnetwork.org/forum/t/accelerometer-downlink-activation/66348/2 "2024-01-23T08:36:44Z")

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Hi,

I believe you have slightly older firmware version, which at the time accelerometer events was not incorporated. If you can, please try the [freefall\_lorawan](https://github.com/TheThingsIndustries/generic-node-se/tree/develop/Software/app/freefall_lorawan) app from our repo, otherwise DM me and I’ll send you the updated firmware binary.