My Android Phone can not access mesh node through GATT，because of BAD MIC.

[Kai777]

In Our project we build a mesh network(about 100 mesh node)，before it work fine,but now we found can not access all mesh node through GATT link using mesh provision app.
So i debug the device(mesh node),i found "Decryption Fail" Error and i get the bad mic cause this fail.The Source code;

------------------------------------------------------------------------
nordicMesh-v5.0/mesh/core/src/ccm_soft.c
ccm_soft_decrypt{
    *p_mic_passed = memcmp(mic_out, p_data->p_mic, p_data->mic_len) == 0;
}

------------------------------------------------------------------------

mic_out(device calculate) is not the same as p_pata->p_mic(from remote phone)

I can Positioning error but can not reslove. anyone can help?

Thanks!

[Mttrinh]

Hi,

Our project we build a mesh network(about 100 mesh node)，before it work fine,but now we found can not access all mesh node through GATT link using mesh provision app

Can you clarify what you mean? You say it worked before, what have changed?

What phone have you tested with? Have you tried testing with another phone and do you see the same issue?

[Kai777]

I can not reproduce the replay step and wonder what caused it.

The test phone is Huawei P10(Android) and i am already testing with another phone have the same result.

Thanks.

[Mttrinh]

Hi,

Can you provide some logs I can take a look at? 

What happen on the phone side when this issue occurs?

This happens to only some devices in the network?