Rust for ESP32 (no_std): If you're using Rust for ESP32 in a no_std environment, you'll need to set up the esp-rs toolchain. Here's what you should do:
a. Install the Rust toolchain for ESP32:
cargo install cargo-espflash --locked
cargo install cargo-espmonitor
b. Install the Xtensa toolchain: You can use the esp-rs/espup tool to install the required toolchain:
cargo install espup
espup install
https://docs.esp-rs.org/book/writing-your-own-application/generate-project/index.html
cargo install cargo-generate
cargo generate esp-rs/esp-template
source ~/export-esp.sh
sh ./scripts/run.sh