fn tcp_read(&mut self, sn: Sn, buf: &mut [u8]) -> Result<u16, Self::Error> {
        debug_assert!(!matches!(
            self.sn_sr(sn)?,
            Ok(SocketStatus::Udp) | Ok(SocketStatus::Init) | Ok(SocketStatus::Macraw)
        ));

        let rx_bytes: u16 = {
            let rsr: u16 = self.sn_rx_rsr(sn)?;
            min(rsr, u16::try_from(buf.len()).unwrap_or(u16::MAX))
        };
        if rx_bytes != 0 {
            let ptr: u16 = self.sn_rx_rd(sn)?;
            self.sn_rx_buf(sn, ptr, &mut buf[..usize::from(rx_bytes)])?;
            self.set_sn_rx_rd(sn, ptr.wrapping_add(rx_bytes))?;
            self.set_sn_cr(sn, SocketCommand::Recv)?;
        }
        Ok(rx_bytes)
    }
/// Read data from the remote host, returning the number of bytes read.
///
/// You should wait for the socket [`recv`] interrupt before calling this method.
///
/// # Panics
///
/// * (debug) The socket must be an [`Established`] TCP socket.
///
/// # Example
///
/// Send a MQTT CONNECT packet and read a CONNACK.
///
/// ```no_run
/// # use embedded_hal_mock as h;
/// # let mut w5500 = w5500_ll::blocking::vdm::W5500::new(h::spi::Mock::new(&[]), h::pin::Mock::new(&[]));
/// use w5500_hl::{
///     ll::{Registers, Sn, SocketInterrupt},
///     net::{Ipv4Addr, SocketAddrV4},
///     Tcp,
/// };
///
/// const MQTT_SOCKET: Sn = Sn::Sn0;
/// const MQTT_SOURCE_PORT: u16 = 33650;
/// const MQTT_SERVER: SocketAddrV4 = SocketAddrV4::new(Ipv4Addr::new(192, 168, 2, 10), 1883);
///
/// w5500.tcp_connect(MQTT_SOCKET, MQTT_SOURCE_PORT, &MQTT_SERVER)?;
///
/// // ... wait for a CON interrupt
///
/// const CONNECT: [u8; 14] = [
///     0x10, 0x0C, 0x00, 0x04, b'M', b'Q', b'T', b'T', 0x04, 0x02, 0x0E, 0x10, 0x00, 0x00,
/// ];
/// let tx_bytes: u16 = w5500.tcp_write(MQTT_SOCKET, &CONNECT)?;
/// assert_eq!(usize::from(tx_bytes), CONNECT.len());
///
/// // ... wait for a RECV interrupt
///
/// let mut buf = [0; 10];
/// let rx_bytes: u16 = w5500.tcp_read(MQTT_SOCKET, &mut buf)?;
/// let filled_buf = &buf[..rx_bytes.into()];
/// # Ok::<(), w5500_hl::ll::blocking::vdm::Error<_, _>>(())
/// ```
///
/// [`Established`]: w5500_ll::SocketStatus::Established
/// [`recv`]: w5500_ll::SocketInterrupt::recv_raised
Read data from the remote host, returning the number of bytes read.
You should wait for the socket [`recv`] interrupt before calling this method.
Read data from the remote host returning the number of bytes read . You should wait for the socket [ ` recv ` ] interrupt before calling this method .
fn tcp_read(&mut self, sn: Sn, buf: &mut [u8]) -> Result<u16, Self::Error> {
        debug_assert!(!matches!(
            self.sn_sr(sn)?,
            Ok(SocketStatus::Udp) | Ok(SocketStatus::Init) | Ok(SocketStatus::Macraw)
        ));
        let rx_bytes: u16 = {
            let rsr: u16 = self.sn_rx_rsr(sn)?;
            min(rsr, u16::try_from(buf.len()).unwrap_or(u16::MAX))
        };
        if rx_bytes != 0 {
            let ptr: u16 = self.sn_rx_rd(sn)?;
            self.sn_rx_buf(sn, ptr, &mut buf[..usize::from(rx_bytes)])?;
            self.set_sn_rx_rd(sn, ptr.wrapping_add(rx_bytes))?;
            self.set_sn_cr(sn, SocketCommand::Recv)?;
        }
        Ok(rx_bytes)
    }
fn tcp_read ( & mut self , sn : Sn , buf : & mut [ u8 ] ) -> Result < u16 , Self :: Error > { debug_assert ! ( matches ( self sn_sr ( sn ) Ok ( SocketStatus Udp ) Ok ( SocketStatus Init ) Ok ( SocketStatus Macraw ) ) ) ; let rx_bytes : u16 = { let rsr : u16 = self . sn_rx_rsr ( sn ) ? ; min ( rsr , u16 :: try_from ( buf . len ( ) ) . unwrap_or ( u16 :: MAX ) ) } ; if rx_bytes != 0 { let ptr : u16 = self . sn_rx_rd ( sn ) ? ; self . sn_rx_buf ( sn , ptr , & mut buf [ .. usize :: from ( rx_bytes ) ] ) ? ; self . set_sn_rx_rd ( sn , ptr . wrapping_add ( rx_bytes ) ) ? ; self . set_sn_cr ( sn , SocketCommand :: Recv ) ? ; } Ok ( rx_bytes ) }
Read data from the remote host, returning the number of bytes read.
Read data from the remote host returning the number of bytes read .
&mut self
sn
Sn
buf
&mut [u8]
&mut self
sn
Sn
buf
&mut [u8]
panics
(debug) The socket must be an [`Established`] TCP socket.
( debug ) The socket must be an [ ` Established ` ] TCP socket .
example
Send a MQTT CONNECT packet and read a CONNACK.


Send a MQTT CONNECT packet and read a CONNACK .
use embedded_hal_mock as h;
None
let mut w5500 = w5500_ll::blocking::vdm::w5500::new(h::spi::mock::new(&[]), h::pin::mock::new(&[]));
use w5500_hl::{
ll::{Registers, Sn, SocketInterrupt},
net::{Ipv4Addr, SocketAddrV4},
Tcp,
}.



w5500.tcp_connect(MQTT_SOCKET, MQTT_SOURCE_PORT, &MQTT_SERVER)?.

wait for a CON interrupt



wait for a RECV interrupt


use w5500_hl :: { ll :: { Registers Sn SocketInterrupt } net :: { Ipv4Addr SocketAddrV4 } Tcp } . w5500 . tcp_connect ( MQTT_SOCKET MQTT_SOURCE_PORT &MQTT_SERVER ) ? . wait for a CON interrupt wait for a RECV interrupt
ok::<(), w5500_hl::ll::blocking::vdm::error<_, _>>(())


[`Established`]: w5500_ll::SocketStatus::Established
[`recv`]: w5500_ll::SocketInterrupt::recv_raised
[ ` Established ` ] : w5500_ll :: SocketStatus :: Established [ ` recv ` ] : w5500_ll :: SocketInterrupt :: recv_raised