First commit

.cargo/config

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+[build]
+target = "xtensa-esp32-espidf"
+
+[target.xtensa-esp32-espidf]
+linker = "ldproxy"
+
+[unstable]
+build-std = ["std", "panic_abort"]
+build-std-features = ["panic_immediate_abort"]
+configurable-env = true # No longer necessary since 1.56, as it was stabilized: https://github.com/rust-lang/cargo/blob/master/src/cargo/core/features.rs#L698
+extra-link-arg = true   # No longer necessary since 1.56, as it was stabilized: https://github.com/rust-lang/cargo/blob/master/src/cargo/core/features.rs#L695
+
+[env]
+ESP_IDF_SYS_GLOB_BASE = { value = ".", relative = true }
+

Cargo.toml

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+[package]
+name = "rusty-espresso"
+version = "0.1.0"
+edition = "2018"
+
+
+
+[features]
+bind = []
+
+[dependencies]
+anyhow = {version = "1", features = ["backtrace"]}
+esp-idf-sys = { version = "0.20" }
+embedded-svc = "0.8.3"
+esp-idf-svc = { version = "0.20", features = ["binstart"] }
+esp-idf-hal = "0.20"
+
+[build-dependencies]
+embuild = "0.24"
+anyhow = "1"

build.rs

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+use std::path::PathBuf;
+
+use embuild::{
+    self, bingen,
+    build::{CfgArgs, LinkArgs},
+    cargo, symgen,
+};
+
+// Necessary because of this issue: https://github.com/rust-lang/cargo/issues/9641
+fn main() -> anyhow::Result<()> {
+    LinkArgs::output_propagated("ESP_IDF")?;
+
+    let cfg = CfgArgs::try_from_env("ESP_IDF")?;
+
+    if cfg.get("esp32s2").is_some() {
+        let ulp_elf = PathBuf::from("ulp").join("rust-esp32-ulp-hello");
+        symgen::run(&ulp_elf, 0x5000_0000)?; // This is where the RTC Slow Mem is mapped within the ESP32-S2 memory space
+        bingen::run(&ulp_elf)?;
+
+        cargo::track_file(ulp_elf);
+    }
+
+    cfg.output();
+
+    Ok(())
+}

env.sh

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+#!/bin/bash
+
+export PATH=$HOME/xtensa-esp32-elf-clang/bin:$PATH
+. $HOME/esp/esp-idf/export.sh
+rustup default esp
+
+

sdkconfig.defaults

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+CONFIG_LWIP_L2_TO_L3_COPY=y
+CONFIG_LWIP_IP_FORWARD=y
+CONFIG_LWIP_IPV4_NAPT=y
+#CONFIG_ESP_SYSTEM_USE_EH_FRAME=y
+#CONFIG_COMPILER_CXX_EXCEPTIONS=y
+

src/main.rs

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+
+fn main() {
+    println!("Hello, world!");
+}