Join-Request error code: MICFailed

Devices
1

Hi everyone,
I installed lora server some weeks ago and now I’m trying to use a lopy4 with OTAA. However, I had the next problem with the code of example (https://github.com/brocaar/pycom-examples)

“level=error msg="processing uplink frame error"
data_base64="AAEBAQEBAQEBq4vqm0nVs3CpqNTz+xA=" error="join-request to join-server
error: response error, code: MICFailed, description: invalid mic"”

I attach the logs (in case somebody can help me with this error)

Logs Lora-server

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image.png1280×1024 310 KB

Logs Lora-gateway-bridge

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image.png914×389 297 KB

Response in the app

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image.png1280×1024 183 KB

Thank you.

2

This error means that the keys that you have setup are invalid. In other words the MIC is generated with a key that doesn’t match the key in LoRa App Server meaning the MIC can’t be validated.

3

Ok, but I’m copyng the next key in my code

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image.jpg1590×756 121 KB

And my code is like this:
app_eui = binascii.unhexlify(‘0101010101010101’)
app_key = binascii.unhexlify(‘81f07035a1f1b010373a5cb2b0c81f7b’)

I dont’t see where is the mistake, I would appreciate some tips

4

Maybe the byte-order is the issue? See the MSB / LSB toggle :slight_smile:

1 Like
5

I tried the two options but I had the same response :frowning_face:

6

I had the same issue when configuring a sensor via NFC. It did not properly read the original keys via the NFC process, so the keys where suddenly wrong in the sensor (the device had already joined). So I got the same MIC error on LNS level. Maybe this helps your old case :slight_smile:

7

Hi, I have device with Device EUI , Appkey is not provided with the end node, How I can register the end node to get the device data ??