ecr17-protocol 1.0.1

Italian ECR17 payment protocol (Nexi Group POS terminals) over LAN — pure-Rust protocol engine plus an async client and an optional tokio TCP transport.
Documentation 
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//! # ecr17-protocol
//!
//! A pure-Rust implementation of the Italian **ECR17** payment protocol used by
//! **Nexi Group** POS terminals over a local LAN connection.
//!
//! The crate is layered so the protocol logic is trivially testable and free of I/O
//! (modules are added incrementally per `docs/PLAN.md`):
//!
//! - `lrc` — LRC checksum and `LrcMode` framing selector
//! - `codec` — STX/ETX/LRC framing (encode/decode)
//! - `types` — request/result/enum data model (serde)
//! - `protocol` — message builders (one per ECR17 command)
//! - `response` — response parsers
//! - `retry` — money-safety retry policy (a financial command is never blindly replayed)
//! - `session` — ACK/NAK, retransmit, timeout orchestration over a `Transport`
//! - `client` — the async `Ecr17Client` API
//!
//! I/O lives behind the async `Transport` trait; the real tokio TCP transport is
//! available under the `tokio-transport` feature.
//!
//! 💰 **Money-critical:** this drives a terminal that charges real cards. Financial
//! commands are never blindly re-sent after a reconnect — recover a lost response via
//! `send_last_result()` (spec command `G`).
//!
//! > Protocol reference (public): <https://developer.nexigroup.com/traditionalpos/en-EU/docs/>

#![forbid(unsafe_code)]
#![warn(missing_debug_implementations)]

// Layers are added incrementally per the implementation plan (docs/PLAN.md).
pub mod client;
pub mod codec;
pub mod error;
pub mod lrc;
pub mod protocol;
pub mod response;
pub mod retry;
pub mod session;
pub mod transport;
pub mod types;

pub use client::Ecr17Client;
pub use codec::{DecodedPacket, PacketCodec, PacketType};
pub use error::{Ecr17Error, Result};
pub use lrc::LrcMode;
pub use retry::should_retry_after_reconnect;
pub use session::{Ecr17Session, SessionConfig};
pub use transport::{FakeTransport, Transport};
pub use types::*;