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format of the sign_key #8

@cloverstd

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@cloverstd

Hi, I have an Airmx fresh air machine.
Since Airmx has gone bankrupt, I can't control it via the app anymore.

I referred to this repository that allows the fresh air machine to connect to MQTT.
However, the fresh air machine is different from the Airmx humidifier.
After a power outage and restart, it doesn't send the sign_key to i.airmx.cn.
I guess it may need to be reset and then connected, but in that case, my fresh air machine won't be able to connect to Wi-Fi after reset.

Based on this repository, I know the sign logic of sig, but I don't know the sign_key.

I can obtain the sig calculated by the fresh air machine through MQTT messages.

So, could you please tell me the format of the sign_key?

I want to try to crack the sign_key through brute - force enumeration.

Thanks.

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