Your Smart Diffuser Is an ESP32 With the Cloud Keys in Plaintext

Sun, 12 Jul 2026 00:00:00 +0000

Disclosure: English is my third language and I can’t write for shit in any of them. I used AI to help me write this post. The research, teardown, reverse-engineering, and every technical finding here are entirely mine. The AI helped me say it without making your eyes bleed. If you’d rather argue about prose than NFC antenna multiplexing, this isn’t the post for you.

I bought into the Pura ecosystem the way everyone does. The app is slick, the scents are genuinely nice, and the hardware looks like it fell off an Apple truck. Then I saw what a replacement cartridge costs, watched the whole thing go dark the moment the cloud sneezed, and did what I always do — I opened it up.

Nfc on bay41

Your Smart Diffuser Is an ESP32 With the Cloud Keys in Plaintext