tpt-async

The runtime-agnostic async I/O stack for Rust.
From a 2 MB RAM Cortex-M microcontroller to a 64-core cloud server — one API, no forced executor, no 150-crate dependency tree.

Quick Start

[dependencies]
tpt-async  = "0.1"
tpt-net-http = "0.1"
tpt-net-tls  = "0.1"

use tpt_async::prelude::*;
use tpt_net_http::prelude::*;

#[tpt_async::main]
async fn main() {
    let client = HttpClient::builder()
        .tls(tpt_net_tls::rustls_config())
        .build();

    let response = client
        .get("https://api.tpt.solutions/health")
        .timeout(Duration::from_millis(500))
        .send()
        .await
        .unwrap();

    println!("Status: {}", response.status());
}

Workspace Crates

Crate	Description	no_std
tpt-async-core	Spawn/LocalSpawn traits, Waker utils, state-machine helpers	✅
tpt-async-macros	#[tpt_async::main] proc-macro	—
tpt-async-executor	Optional single-threaded cooperative executor	alloc
tpt-async-timer	Const-generic heapless hierarchical timer wheel	✅
tpt-async-io	Zero-copy AsyncRead/AsyncWrite over std/tokio/async-std/bare-metal	alloc
tpt-net-tls	rustls 0.23 wrapper — no OpenSSL	std
tpt-net-http	HTTP/1.1 + HTTP/2 zero-copy client/server	std
tpt-net-ws	Pure-Rust WebSocket client/server	std
tpt-async	Facade re-exporting tpt_async::prelude	feature-gated

Design Principles

• No async-trait — uses RPITIT (async fn in traits, stable since Rust 1.75). Zero heap allocation from trait dispatch.
• Heapless timers — const-generic hierarchical timer wheel: O(1) insertion/removal, zero dynamic allocation.
• Zero-copy I/O — HTTP headers parsed directly into &[u8] slices from the I/O buffer.
• Bring your own executor — implement Spawn for your runtime (tokio, async-std, embassy, smol) and everything works.
• Audited TLS chain — rustls 0.23 only, TLS 1.3 by default, no OpenSSL path, cargo deny enforced.

Supported Targets

• x86_64-unknown-linux-gnu / x86_64-pc-windows-msvc
• thumbv7em-none-eabihf (ARM Cortex-M, core + timer crates)
• riscv32imac-unknown-none-elf (RISC-V bare-metal, core + timer crates)
• wasm32-unknown-unknown (Browser / WASI)

License

Licensed under either of MIT or Apache-2.0 at your option.
Copyright 2026 TPT Solutions.