Hi everyone, I’m working on a small IoT project where an ESP32 collects sensor data and needs to securely send it to cloud services. I’m wondering what the best practice is for storing or rotating credentials when a device must authenticate to a backend or third‑party API without risking leaks. For context, I’ve been following this ESP32 cloud sensor example that demonstrates posting sensor data via HTTP:https://www.theengineeringprojects.com/2022/02/sending-data-to-cloud-with-esp32-and-thingspeak.html and I’d like to extend that with secure credential handling rather than hard‑coding keys. I’ve seen Arduino forum threads where people discuss storing secrets in flash and some Raspberry Pi community projects that use environment variables or config files with permission locks, but I haven’t found many secure ways specific to microcontrollers. If you’ve integrated Bitwarden or similar secure credential flows with IoT devices, what patterns or libraries do you recommend for safe storage and automated refresh of API keys/passwords?