A device that 'looks like a normal USB cable' but packs in an ESP32-S3 microcontroller, micro SD card storage, and Wi-Fi capabilities has enjoyed great success on Kickstarter.
If the one thing about smart home appliances that deterred you from ever investing in this connected future was how your data was always being routed through servers, you're in for a treat. A skilled developer has hacked his new Xiaomi Humidifier with ESPHome, making the device compatible with Home Assistant.