[bryal]

They are callable from plain Rust. See the crate `esp-idf-sys` [1]. I'm using ESP32-C3, Rust, and the IDF for a DIY RGB room lighting solution [2]. Convenient MQTT and OTA updates -- it's great! Espressif and the Rust community have done an amazing job.

But I'd also love to be able to do the project without ESP IDF, using `no_std` and smaller specific crates instead. The solution for using ESP IDF in Rust is fairly convenient, but it does require some extra steps and the disk usage is not insignificant. A pure Rust solution would be more elegant.

[1] https://esp-rs.github.io/esp-idf-svc/esp_idf_svc/mqtt/client...

[2] https://git.sr.ht/~jojo/huelia/tree/esp32-c3_and_mqtt/item/p...