I’ve not used the pi4 yet, but I’ve seen a few starter packs going cheap so might be worth a look…
Proxmark3 is pretty versatile, so next move will be to hook one up to a pocket chip mini computer, and do more with the smartphones stuff… Cuts down on bulky shit on pentesting missions, and is pretty stealthy too.
I’ve got a server which I’m planning on trying to utilise to crack some NFC encryption keys if it can be done, but NFC stuff isn’t really my strongest of points yet… More and more stuff is using it now, so I reckon this will become even bigger in the future moving forward… Along with the IoT