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io: add separate embedded-io-adapters crate, add futures/tokio support.
If we want to release `embedded-io` 1.0 and the adapters live there, we can't make any breaking changes to them after release. Putting them in a separate crate allows doing breaking changes without breaking everyone using the IO traits.
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.github/workflows/clippy.yml

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# Use a pinned version to avoid spontaneous breakages (new clippy lints are added often)
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toolchain: nightly-2023-07-03
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components: clippy
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- run: cargo clippy --features=std -- --deny=warnings
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- run: cargo clippy --all-features -- --deny=warnings

.github/workflows/test.yml

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features: std
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- target: x86_64-unknown-linux-gnu
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features: alloc
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- target: x86_64-unknown-linux-gnu
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features: std,tokio-1,futures-03
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rust: nightly
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steps:
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- uses: actions/checkout@v3
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- uses: dtolnay/rust-toolchain@master

Cargo.toml

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"embedded-can",
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"embedded-io",
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"embedded-io-async", # nightly-only
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"embedded-io-adapters",
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]

embedded-io-adapters/Cargo.toml

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[package]
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name = "embedded-io-adapters"
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version = "0.1.0"
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edition = "2021"
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description = "Adapters between the `embedded-io` traits and other I/O traits"
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repository = "https://github.com/rust-embedded/embedded-hal"
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readme = "README.md"
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license = "MIT OR Apache-2.0"
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categories = [
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"embedded",
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"no-std",
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]
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[features]
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std = ["embedded-io/std"]
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tokio-1 = ["std", "dep:tokio", "dep:embedded-io-async", "embedded-io-async?/std"]
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futures-03 = ["std", "dep:futures", "dep:embedded-io-async", "embedded-io-async?/std"]
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[dependencies]
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embedded-io = { version = "0.5", path = "../embedded-io" }
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embedded-io-async = { version = "0.5", path = "../embedded-io-async", optional = true }
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futures = { version = "0.3.21", features = ["std"], default-features = false, optional = true }
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tokio = { version = "1", default-features = false, optional = true }
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[package.metadata.docs.rs]
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features = ["std"]
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rustdoc-args = ["--cfg", "docsrs"]

embedded-io-adapters/LICENSE-APACHE

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embedded-io-adapters/LICENSE-MIT

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Copyright (c) 2023 The embedded-io authors
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Permission is hereby granted, free of charge, to any
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person obtaining a copy of this software and associated
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documentation files (the "Software"), to deal in the
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is furnished to do so, subject to the following
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The above copyright notice and this permission notice
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shall be included in all copies or substantial portions
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of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
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IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.

embedded-io-adapters/README.md

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[![crates.io](https://img.shields.io/crates/d/embedded-io.svg)](https://crates.io/crates/embedded-io)
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[![crates.io](https://img.shields.io/crates/v/embedded-io.svg)](https://crates.io/crates/embedded-io)
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[![Documentation](https://docs.rs/embedded-io/badge.svg)](https://docs.rs/embedded-io)
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# `embedded-io-adapters`
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This project is developed and maintained by the [HAL team](https://github.com/rust-embedded/wg#the-hal-team).
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Adapters between the [`embedded-io`](https://crates.io/crates/embedded-io) and [`embedded-io-async`](https://crates.io/crates/embedded-io-async) traits and other IO traits.
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The adapters are structs that wrap an I/O stream and implement another family of I/O traits
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based on the wrapped streams. This allows "converting" from an `embedded_io::Read`
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to a `std::io::Read` or vice versa, for example.
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There are no separate adapters for `Read`/`ReadBuf`/`Write` traits. Instead, a single
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adapter implements the right traits based on what the inner type implements.
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This allows using these adapters when using combinations of traits, like `Read+Write`.
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## Supported traits
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For `embedded-io`:
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- [`std::io`](https://doc.rust-lang.org/stable/std/io/index.html) traits. Needs the `std` feature.
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For `embedded-io-async`:
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- [`futures` 0.3](https://crates.io/crates/futures) traits. Needs the `futures-03` feature.
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- [`tokio` 1.x](https://crates.io/crates/tokio) traits. Needs the `tokio-1` feature.
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## Minimum Supported Rust Version (MSRV)
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This crate is guaranteed to compile on stable Rust 1.59 and up. It *might*
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compile with older versions but that may change in any new patch release.
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See [here](../docs/msrv.md) for details on how the MSRV may be upgraded.
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Enabling any of the `tokio-*` or `futures-*` Cargo features requires Rust nightly newer than
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`nightly-2022-11-22`, due to requiring support for `async fn` in traits (AFIT),
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which is not stable yet. Keep in mind Rust nightlies can make backwards-incompatible
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changes to unstable features at any time.
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## License
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Licensed under either of
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- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
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<http://www.apache.org/licenses/LICENSE-2.0>)
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- MIT license ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
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at your option.
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### Contribution
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Unless you explicitly state otherwise, any contribution intentionally submitted
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for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
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dual licensed as above, without any additional terms or conditions.

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