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use core::net::IpAddr;
use heapless::String;
use core::str::FromStr;
use core::fmt::Write;
/// Provides a higher level API for configuring and reading information for a given
/// context id.
pub struct Control<'a> {
control: crate::Control<'a>,
cid: u8,
}
pub struct Config<'a> {
pub gateway: &'a str,
pub auth_prot: AuthProt,
pub auth: Option<(&'a str, &'a str)>,
}
#[repr(u8)]
pub enum AuthProt {
None = 0,
Pap = 1,
Chap = 2,
}
#[derive(Clone, Copy, PartialEq, Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum Error {
BufferTooSmall,
AtCommand,
AddrParseError,
Format,
}
impl From<core::fmt::Error> for Error {
fn from(_: core::fmt::Error) -> Self {
Self::Format
}
}
#[derive(PartialEq, Debug)]
pub struct Status {
pub attached: bool,
pub ip: Option<IpAddr>,
}
#[cfg(feature = "defmt")]
impl defmt::Format for Status {
fn format(&self, f: defmt::Formatter<'_>) {
defmt::write!(f, "attached: {}", self.attached);
if let Some(ip) = &self.ip {
defmt::write!(f, ", ip: {}", defmt::Debug2Format(&ip));
}
}
}
impl<'a> Control<'a> {
pub async fn new(control: crate::Control<'a>, cid: u8) -> Self {
control.wait_init().await;
Self { control, cid }
}
/// Bypass modem configurator
pub async fn at_command(&self, req: &[u8], resp: &mut [u8]) -> usize {
self.control.at_command(req, resp).await
}
/// Configures the modem with the provided config.
pub async fn configure(&self, config: Config<'_>) -> Result<(), Error> {
let mut cmd: String<128> = String::new();
let mut buf: [u8; 256] = [0; 256];
write!(cmd, "AT+CGDCONT={},\"IP\",\"{}\"", self.cid, config.gateway).map_err(|_| Error::BufferTooSmall)?;
let n = self.control.at_command(cmd.as_bytes(), &mut buf).await;
let mut res = &buf[..n];
let res = split_field(&mut res);
if res != b"OK" {
return Err(Error::AtCommand)
}
cmd.clear();
write!(cmd, "AT+CGAUTH={},{}", self.cid, config.auth_prot as u8)?;
if let Some((username, password)) = config.auth {
write!(cmd, ",\"{}\",\"{}\"", username, password).map_err(|_| Error::BufferTooSmall)?;
}
let n = self.control.at_command(cmd.as_bytes(), &mut buf).await;
let mut res = &buf[..n];
let res = split_field(&mut res);
if res != b"OK" {
return Err(Error::AtCommand)
}
cmd.clear();
let n = self.control.at_command(b"AT+CFUN=1", &mut buf).await;
let mut res = &buf[..n];
let res = split_field(&mut res);
if res != b"OK" {
return Err(Error::AtCommand);
}
Ok(())
}
pub async fn status(&self) -> Result<Status, Error> {
let mut buf: [u8; 256] = [0; 256];
let n = self.control.at_command(b"AT+CGATT?", &mut buf).await;
let mut res = &buf[..n];
pop_prefix(&mut res, b"+CGATT: ");
let res = split_field(&mut res);
let attached = res == b"1";
if !attached {
return Ok(Status { attached, ip: None })
}
let mut s: String<128> = String::new();
write!(s, "AT+CGPADDR={}", self.cid)?;
let n = self.control.at_command(s.as_bytes(), &mut buf).await;
let mut res = &buf[..n];
s.clear();
write!(s, "+CGPADDR: {},", self.cid)?;
info!("RES: {:?}", unsafe {core::str::from_utf8_unchecked(res)});
if s.len() > res.len() {
let res = split_field(&mut res);
if res == b"OK" {
Ok(Status { attached, ip: None })
} else {
Err(Error::AtCommand)
}
} else {
pop_prefix(&mut res, s.as_bytes());
let ip = split_field(&mut res);
if !ip.is_empty() {
let ip = IpAddr::from_str(unsafe { core::str::from_utf8_unchecked(ip) }).map_err(|_| Error::AddrParseError)?;
self.control.open_raw_socket().await;
Ok(Status { attached, ip: Some(ip) })
} else {
Ok(Status { attached, ip: None })
}
}
}
}
pub(crate) fn is_whitespace(char: u8) -> bool {
match char {
b'\r' | b'\n' | b' ' => true,
_ => false,
}
}
pub(crate) fn is_separator(char: u8) -> bool {
match char {
b',' | b'\r' | b'\n' | b' ' => true,
_ => false,
}
}
pub(crate) fn split_field<'a>(data: &mut &'a [u8]) -> &'a [u8] {
while !data.is_empty() && is_whitespace(data[0]) {
*data = &data[1..];
}
if data.is_empty() {
return &[];
}
if data[0] == b'"' {
let data2 = &data[1..];
let end = data2.iter().position(|&x| x == b'"').unwrap_or(data2.len());
let field = &data2[..end];
let mut rest = &data2[data2.len().min(end + 1)..];
if rest.first() == Some(&b'\"') {
rest = &rest[1..];
}
while !rest.is_empty() && is_separator(rest[0]) {
rest = &rest[1..];
}
*data = rest;
field
} else {
let end = data.iter().position(|&x| is_separator(x)).unwrap_or(data.len());
let field = &data[0..end];
let rest = &data[data.len().min(end + 1)..];
*data = rest;
field
}
}
pub(crate) fn pop_prefix(data: &mut &[u8], prefix: &[u8]) {
assert!(data.len() >= prefix.len());
assert!(&data[..prefix.len()] == prefix);
*data = &data[prefix.len()..];
}
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