When sending data to the device through MQTT, the backend log reported an error, causing the data to not be delivered to the hardware device

1

When sending data to the device through MQTT, the backend log reported an error, causing the data to not be delivered to the hardware device.
The server is functioning normally on TTN.

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The server：
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2

According to the documentation, it seems you have to include the devEui in the json as well.

2 Likes
5

Thank you, I have resolved it. v4 and v3 are different and require the addition of devEui