Crate at_parser_rs 

AT Command Parser Library

This library provides a flexible parser for AT commands, commonly used in embedded systems and communication devices. It supports no_std environments.

Architecture

The library is built around three core components:

• AtParser - The main parser that processes AT command strings
• AtContext - Trait for implementing command handlers
• Args - Structure for accessing command arguments

Command Forms

Supports all standard AT command forms:

• AT+CMD - Execute (action without parameters)
• AT+CMD? - Query (get current value/state)
• AT+CMD=? - Test (get supported values/ranges)
• AT+CMD=<args> - Set (configure with parameters)

Quick Start

use at_parser_rs::context::AtContext;
use at_parser_rs::parser::AtParser;
use at_parser_rs::{Args, AtResult, AtError};
use osal_rs::utils::Bytes;

const SIZE: usize = 64;

// 1. Define a command handler
struct EchoModule { echo: bool }

impl AtContext<SIZE> for EchoModule {
    fn query(&mut self) -> AtResult<SIZE> {
        if self.echo { Ok(Bytes::from_str("1")) } else { Ok(Bytes::from_str("0")) }
    }
     
    fn set(&mut self, args: Args) -> AtResult<SIZE> {
        let value = args.get(0).ok_or(AtError::InvalidArgs)?;
        match value.as_ref() {
            "0" => { self.echo = false; Ok(Bytes::from_str("OK")) }
            "1" => { self.echo = true; Ok(Bytes::from_str("OK")) }
            _ => Err(AtError::InvalidArgs),
        }
    }
}

// 2. Create parser and register commands
let mut echo = EchoModule { echo: false };
let mut parser: AtParser<EchoModule, SIZE> = AtParser::new();

let commands: &mut [(&str, &mut dyn AtContext<SIZE>)] = &mut [
    ("AT+ECHO", &mut echo),
];
parser.set_commands(commands);

// 3. Execute commands
parser.execute("AT+ECHO=1");  // Set echo on
parser.execute("AT+ECHO?");   // Query current state

Features

• freertos (default) - Enable FreeRTOS support via osal-rs
• posix - Enable POSIX support via osal-rs
• std - Enable standard library support via osal-rs
• disable_panic - Pass-through feature to osal-rs for panic handling

Thread Safety

The library can be used in single-threaded (bare-metal) or multi-threaded (RTOS) environments. For RTOS, use appropriate synchronization primitives around command handlers (e.g., Mutex<RefCell<Handler>>).

Modules

context

parser

Macros

at_modules

Declares a static COMMANDS table mapping AT command strings to their handlers.

at_quoted

Wraps a value in double-quote characters (").

at_response

Macro to format an AT response with 1–6 comma-separated parameters.

Structs

Args

Structure holding the arguments passed to an AT command

Enums

AtError

Error types that can occur during AT command processing

Type Aliases

AtResult

Result type for AT command operations Returns either a Bytes<SIZE> response buffer or an AtError