apk-decompiler VS ubertooth

You can decompile android apps, which will give mostly the original Java Classes / functions with anonymized names (class A, function b, etc...). Framework classes and methods usually stay pretty much the same.

See for example https://github.com/robertohuertasm/apk-decompiler and https://github.com/vaibhavpandeyvpz/apkstudio (only used the first one but the seconds looks practical)

The 2.4GHz spectrum is shared between Bluetooth and WiFi 802.11b/g. A few years ago, I was doing some work using an Ubertooth-One scanner (https://greatscottgadgets.com/ubertoothone/). It was showing the traffic on different channels.

My wife stuck a burrito to warm up in the microwave a room away (30-40 ft). This was with a brand-name model, so presumably properly shielded, etc.

Nope. The entire spectrum just went white with noise on all channels.

Once the microwave cycle ended, it still took a good 15-30 seconds before the airwaves calmed down and went back to normal traffic.

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I think these are : Proxmark3 HackRF One USB RUBBER DUCKY Flipper Zero WIFI PINEAPPLE PWNAGOTCHI SHARK JACK the usb one looks like Ubertooth One not sure Raspberry pi with a touch screen lock picking kit

Using something like this[0].

[0]: https://greatscottgadgets.com/ubertoothone/

That CC2500 may work for your needs. You might want to check out the Ubertooth One which is built around the CC2400, and can capture 1MHz bandwidth FSK signals.