esp-hal/examples/src/bin/wifi_dhcp.rs

//! DHCP Example
//!
//!
//! Set SSID and PASSWORD env variable before running this example.
//!
//! This gets an ip address via DHCP then performs an HTTP get request to some "random" server
//! When using USB-SERIAL-JTAG you may have to activate the feature `phy-enable-usb` in the esp-wifi crate.

//% FEATURES: esp-wifi esp-wifi/wifi-default esp-wifi/wifi esp-wifi/utils
//% CHIPS: esp32 esp32s2 esp32s3 esp32c2 esp32c3 esp32c6

#![no_std]
#![no_main]

extern crate alloc;

use embedded_io::*;
use esp_alloc as _;
use esp_backtrace as _;
use esp_hal::{
    prelude::*,
    rng::Rng,
    time::{self, Duration},
    timer::timg::TimerGroup,
};
use esp_println::{print, println};
use esp_wifi::{
    init,
    wifi::{
        utils::create_network_interface,
        AccessPointInfo,
        ClientConfiguration,
        Configuration,
        WifiError,
        WifiStaDevice,
    },
    wifi_interface::WifiStack,
};
use smoltcp::{
    iface::SocketStorage,
    wire::{IpAddress, Ipv4Address},
};

const SSID: &str = env!("SSID");
const PASSWORD: &str = env!("PASSWORD");

#[entry]
fn main() -> ! {
    esp_println::logger::init_logger_from_env();
    let peripherals = esp_hal::init({
        let mut config = esp_hal::Config::default();
        config.cpu_clock = CpuClock::max();
        config
    });

    esp_alloc::heap_allocator!(72 * 1024);

    let timg0 = TimerGroup::new(peripherals.TIMG0);

    let init = init(
        timg0.timer0,
        Rng::new(peripherals.RNG),
        peripherals.RADIO_CLK,
    )
    .unwrap();

    let mut wifi = peripherals.WIFI;
    let mut socket_set_entries: [SocketStorage; 3] = Default::default();
    let (iface, device, mut controller, sockets) =
        create_network_interface(&init, &mut wifi, WifiStaDevice, &mut socket_set_entries).unwrap();
    let now = || time::now().duration_since_epoch().to_millis();
    let wifi_stack = WifiStack::new(iface, device, sockets, now);

    let client_config = Configuration::Client(ClientConfiguration {
        ssid: SSID.try_into().unwrap(),
        password: PASSWORD.try_into().unwrap(),
        ..Default::default()
    });
    let res = controller.set_configuration(&client_config);
    println!("wifi_set_configuration returned {:?}", res);

    controller.start().unwrap();
    println!("is wifi started: {:?}", controller.is_started());

    println!("Start Wifi Scan");
    let res: Result<(heapless::Vec<AccessPointInfo, 10>, usize), WifiError> = controller.scan_n();
    if let Ok((res, _count)) = res {
        for ap in res {
            println!("{:?}", ap);
        }
    }

    println!("{:?}", controller.get_capabilities());
    println!("wifi_connect {:?}", controller.connect());

    // wait to get connected
    println!("Wait to get connected");
    loop {
        match controller.is_connected() {
            Ok(true) => break,
            Ok(false) => {}
            Err(err) => {
                println!("{:?}", err);
                loop {}
            }
        }
    }
    println!("{:?}", controller.is_connected());

    // wait for getting an ip address
    println!("Wait to get an ip address");
    loop {
        wifi_stack.work();

        if wifi_stack.is_iface_up() {
            println!("got ip {:?}", wifi_stack.get_ip_info());
            break;
        }
    }

    println!("Start busy loop on main");

    let mut rx_buffer = [0u8; 1536];
    let mut tx_buffer = [0u8; 1536];
    let mut socket = wifi_stack.get_socket(&mut rx_buffer, &mut tx_buffer);

    loop {
        println!("Making HTTP request");
        socket.work();

        socket
            .open(IpAddress::Ipv4(Ipv4Address::new(142, 250, 185, 115)), 80)
            .unwrap();

        socket
            .write(b"GET / HTTP/1.0\r\nHost: www.mobile-j.de\r\n\r\n")
            .unwrap();
        socket.flush().unwrap();

        let deadline = time::now() + Duration::secs(20);
        let mut buffer = [0u8; 512];
        while let Ok(len) = socket.read(&mut buffer) {
            let to_print = unsafe { core::str::from_utf8_unchecked(&buffer[..len]) };
            print!("{}", to_print);

            if time::now() > deadline {
                println!("Timeout");
                break;
            }
        }
        println!();

        socket.disconnect();

        let deadline = time::now() + Duration::secs(5);
        while time::now() < deadline {
            socket.work();
        }
    }
}