Ok, log analysis. Let's see that description

So a json files and one of the bssid will decode to the flag pretty easy But lets open it up

Its pretty ugly looky, cyber chef beautify

That looks better Lets grab those bssids with notepad++

Ok, now that we have them, we can parse them in Linux

doing some cut magic got me my bssids

Doing Notepad++, find and replace removes the colons

Now I could do some script to get the right bssid, but notepad++ had a plugin to decode hex

Of course, the rest of it was garbage, but it was right there. To check my wor,k I hex encoded the string

And I got an exact match