hello Example in Rust

This example demonstrates how to use Rust’s powerful features in a NuttX environment, including:

  • JSON Serialization/Deserialization: Using the popular serde and serde_json crates to work with JSON data

  • Async Runtime: Demonstrates basic usage of the tokio async runtime

  • C Interoperability: Shows how to expose Rust functions to be called from C code

Key Features

  1. JSON Handling - Defines a Person struct with Serialize and Deserialize traits - Serializes Rust structs to JSON strings - Deserializes JSON strings into Rust structs - Demonstrates pretty-printing JSON

  2. Async Runtime - Initializes a single-threaded tokio runtime - Runs a simple async task that prints a message

  3. C Interop - Exports hello_rust_cargo_main function with #[no_mangle] for C calling - Uses extern “C” to define the C ABI

The example shows how Rust’s modern features can be used in embedded systems while maintaining compatibility with C-based systems.

This example serves as a foundation for building more complex Rust applications in NuttX that need to handle JSON data and async operations.