Simple SOME/IP

Simple SOME/IP is a Rust library implementing the SOME/IP automotive communication protocol — remote procedure calls, event notifications, and wire format serialization. Based on the Open SOME/IP Specification.

The library supports both std and no_std environments, making it suitable for embedded targets as well as host-side tooling and scripting.

Features

• no_std compatible — the protocol, traits, and e2e modules work without the standard library
• Service Discovery — SD entry/option encoding and decoding via fixed-capacity heapless collections (no heap allocation)
• End-to-End protection — Profile 4 (CRC-32) and Profile 5 (CRC-16) with zero-allocation APIs
• Async client and server — tokio-based, gated behind optional feature flags
• embedded-io traits for serialization — abstracts over std::io::Read/Write

Modules

• protocol — Wire format layer: SOME/IP header, MessageId, MessageType, ReturnCode, SD entries/options
• traits — WireFormat and PayloadWireFormat traits for custom message types
• e2e — End-to-End protection profiles (always available, no heap allocation)
• client — High-level async tokio client (requires feature = "client")
• server — Async tokio server with SD announcements and event publishing (requires feature = "server")

Usage

Add to your Cargo.toml:

[dependencies]
# Protocol/E2E only (default) — no_std compatible, no tokio dependency
simple-someip = "0.5"

# Client only
simple-someip = { version = "0.5", features = ["client"] }

# Server only
simple-someip = { version = "0.5", features = ["server"] }

# Both client and server
simple-someip = { version = "0.5", features = ["client", "server"] }

Feature flags

Feature	Default	Description
client	no	Async tokio client; implies std + tokio + socket2
server	no	Async tokio server; implies std + tokio + socket2
std	no	Enables std-dependent code

By default only the protocol, traits, and e2e modules are available, and the crate compiles in no_std mode. Most applications only need one of client or server.

Quick Start

Client

use simple_someip::{Client, ClientUpdate, RawPayload};
use std::net::Ipv4Addr;

#[tokio::main]
async fn main() {
    // Client::new returns a (Client, ClientUpdates) pair.
    // Client is Clone-able and can be shared across tasks.
    let (client, mut updates) = Client::<RawPayload>::new(Ipv4Addr::new(192, 168, 1, 100));

    // Bind the SD multicast socket to discover services
    client.bind_discovery().await.unwrap();

    // Receive discovery, unicast, and error updates
    while let Some(update) = updates.recv().await {
        match update {
            ClientUpdate::DiscoveryUpdated(msg) => { /* SD message */ }
            ClientUpdate::Unicast { message, e2e_status } => { /* unicast reply */ }
            ClientUpdate::SenderRebooted(addr) => { /* remote reboot detected */ }
            ClientUpdate::Error(err) => { /* error */ }
        }
    }
}

Server

use simple_someip::server::{Server, ServerConfig};
use std::net::Ipv4Addr;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let config = ServerConfig::new(Ipv4Addr::new(192, 168, 1, 200), 30500, 0x1234, 1);
    let mut server = Server::new(config).await?;
    server.start_announcing()?;

    let publisher = server.publisher();
    tokio::spawn(async move { server.run().await });

    // Publish events to subscribers...
    Ok(())
}

Examples

Examples are provided in the examples/ directory. To run the discovery client example:

cargo run -p discovery_client