wifi_webrequest.rs

//! This example uses the RP Pico W board Wifi chip (cyw43).
//! Connects to Wifi network and makes a web request to get the current time.

#![no_std]
#![no_main]
#![allow(async_fn_in_trait)]

use core::str::from_utf8;

use cyw43_pio::PioSpi;
use defmt::*;
use embassy_executor::Spawner;
use embassy_net::dns::DnsSocket;
use embassy_net::tcp::client::{TcpClient, TcpClientState};
use embassy_net::{Config, Stack, StackResources};
use embassy_rp::bind_interrupts;
use embassy_rp::clocks::RoscRng;
use embassy_rp::gpio::{Level, Output};
use embassy_rp::peripherals::{DMA_CH0, PIO0};
use embassy_rp::pio::{InterruptHandler, Pio};
use embassy_time::{Duration, Timer};
use rand::RngCore;
use reqwless::client::{HttpClient, TlsConfig, TlsVerify};
use reqwless::request::Method;
use serde::Deserialize;
use static_cell::StaticCell;
use {defmt_rtt as _, panic_probe as _, serde_json_core};

bind_interrupts!(struct Irqs {
    PIO0_IRQ_0 => InterruptHandler<PIO0>;
});

const WIFI_NETWORK: &str = "ssid"; // change to your network SSID
const WIFI_PASSWORD: &str = "pwd"; // change to your network password

#[embassy_executor::task]
async fn cyw43_task(runner: cyw43::Runner<'static, Output<'static>, PioSpi<'static, PIO0, 0, DMA_CH0>>) -> ! {
    runner.run().await
}

#[embassy_executor::task]
async fn net_task(stack: &'static Stack<cyw43::NetDriver<'static>>) -> ! {
    stack.run().await
}

#[embassy_executor::main]
async fn main(spawner: Spawner) {
    info!("Hello World!");

    let p = embassy_rp::init(Default::default());
    let mut rng = RoscRng;

    let fw = include_bytes!("../../../../cyw43-firmware/43439A0.bin");
    let clm = include_bytes!("../../../../cyw43-firmware/43439A0_clm.bin");
    // To make flashing faster for development, you may want to flash the firmwares independently
    // at hardcoded addresses, instead of baking them into the program with `include_bytes!`:
    //     probe-rs download 43439A0.bin --binary-format bin --chip RP2040 --base-address 0x10100000
    //     probe-rs download 43439A0_clm.bin --binary-format bin --chip RP2040 --base-address 0x10140000
    // let fw = unsafe { core::slice::from_raw_parts(0x10100000 as *const u8, 230321) };
    // let clm = unsafe { core::slice::from_raw_parts(0x10140000 as *const u8, 4752) };

    let pwr = Output::new(p.PIN_23, Level::Low);
    let cs = Output::new(p.PIN_25, Level::High);
    let mut pio = Pio::new(p.PIO0, Irqs);
    let spi = PioSpi::new(&mut pio.common, pio.sm0, pio.irq0, cs, p.PIN_24, p.PIN_29, p.DMA_CH0);

    static STATE: StaticCell<cyw43::State> = StaticCell::new();
    let state = STATE.init(cyw43::State::new());
    let (net_device, mut control, runner) = cyw43::new(state, pwr, spi, fw).await;
    unwrap!(spawner.spawn(cyw43_task(runner)));

    control.init(clm).await;
    control
        .set_power_management(cyw43::PowerManagementMode::PowerSave)
        .await;

    let config = Config::dhcpv4(Default::default());
    // Use static IP configuration instead of DHCP
    //let config = embassy_net::Config::ipv4_static(embassy_net::StaticConfigV4 {
    //    address: Ipv4Cidr::new(Ipv4Address::new(192, 168, 69, 2), 24),
    //    dns_servers: Vec::new(),
    //    gateway: Some(Ipv4Address::new(192, 168, 69, 1)),
    //});

    // Generate random seed
    let seed = rng.next_u64();

    // Init network stack
    static STACK: StaticCell<Stack<cyw43::NetDriver<'static>>> = StaticCell::new();
    static RESOURCES: StaticCell<StackResources<5>> = StaticCell::new();
    let stack = &*STACK.init(Stack::new(
        net_device,
        config,
        RESOURCES.init(StackResources::new()),
        seed,
    ));

    unwrap!(spawner.spawn(net_task(stack)));

    loop {
        //match control.join_open(WIFI_NETWORK).await { // for open networks
        match control.join_wpa2(WIFI_NETWORK, WIFI_PASSWORD).await {
            Ok(_) => break,
            Err(err) => {
                info!("join failed with status={}", err.status);
            }
        }
    }

    // Wait for DHCP, not necessary when using static IP
    info!("waiting for DHCP...");
    while !stack.is_config_up() {
        Timer::after_millis(100).await;
    }
    info!("DHCP is now up!");

    info!("waiting for link up...");
    while !stack.is_link_up() {
        Timer::after_millis(500).await;
    }
    info!("Link is up!");

    info!("waiting for stack to be up...");
    stack.wait_config_up().await;
    info!("Stack is up!");

    // And now we can use it!

    loop {
        let mut rx_buffer = [0; 8192];
        let mut tls_read_buffer = [0; 16640];
        let mut tls_write_buffer = [0; 16640];

        let client_state = TcpClientState::<1, 1024, 1024>::new();
        let tcp_client = TcpClient::new(stack, &client_state);
        let dns_client = DnsSocket::new(stack);
        let tls_config = TlsConfig::new(seed, &mut tls_read_buffer, &mut tls_write_buffer, TlsVerify::None);

        let mut http_client = HttpClient::new_with_tls(&tcp_client, &dns_client, tls_config);
        let url = "https://worldtimeapi.org/api/timezone/Europe/Berlin";
        // for non-TLS requests, use this instead:
        // let mut http_client = HttpClient::new(&tcp_client, &dns_client);
        // let url = "http://worldtimeapi.org/api/timezone/Europe/Berlin";

        info!("connecting to {}", &url);

        let mut request = match http_client.request(Method::GET, &url).await {
            Ok(req) => req,
            Err(e) => {
                error!("Failed to make HTTP request: {:?}", e);
                return; // handle the error
            }
        };

        let response = match request.send(&mut rx_buffer).await {
            Ok(resp) => resp,
            Err(_e) => {
                error!("Failed to send HTTP request");
                return; // handle the error;
            }
        };

        let body = match from_utf8(response.body().read_to_end().await.unwrap()) {
            Ok(b) => b,
            Err(_e) => {
                error!("Failed to read response body");
                return; // handle the error
            }
        };
        info!("Response body: {:?}", &body);

        // parse the response body and update the RTC

        #[derive(Deserialize)]
        struct ApiResponse<'a> {
            datetime: &'a str,
            // other fields as needed
        }

        let bytes = body.as_bytes();
        match serde_json_core::de::from_slice::<ApiResponse>(bytes) {
            Ok((output, _used)) => {
                info!("Datetime: {:?}", output.datetime);
            }
            Err(_e) => {
                error!("Failed to parse response body");
                return; // handle the error
            }
        }

        Timer::after(Duration::from_secs(5)).await;
    }
}