add wifi_webrequest example

examples/rp/Cargo.toml

@@ -8,11 +8,11 @@ license = "MIT OR Apache-2.0"
 [dependencies]
 embassy-embedded-hal = { version = "0.1.0", path = "../../embassy-embedded-hal", features = ["defmt"] }
 embassy-sync = { version = "0.6.0", path = "../../embassy-sync", features = ["defmt"] }
-embassy-executor = { version = "0.5.0", path = "../../embassy-executor", features = ["task-arena-size-32768", "arch-cortex-m", "executor-thread", "executor-interrupt", "defmt", "integrated-timers"] }
+embassy-executor = { version = "0.5.0", path = "../../embassy-executor", features = ["task-arena-size-98304", "arch-cortex-m", "executor-thread", "executor-interrupt", "defmt", "integrated-timers"] }
 embassy-time = { version = "0.3.1", path = "../../embassy-time", features = ["defmt", "defmt-timestamp-uptime"] }
 embassy-rp = { version = "0.1.0", path = "../../embassy-rp", features = ["defmt", "unstable-pac", "time-driver", "critical-section-impl"] }
 embassy-usb = { version = "0.2.0", path = "../../embassy-usb", features = ["defmt"] }
-embassy-net = { version = "0.4.0", path = "../../embassy-net", features = ["defmt", "tcp", "udp", "raw", "dhcpv4", "medium-ethernet"] }
+embassy-net = { version = "0.4.0", path = "../../embassy-net", features = ["defmt", "tcp", "udp", "raw", "dhcpv4", "medium-ethernet", "dns"] }
 embassy-net-wiznet = { version = "0.1.0", path = "../../embassy-net-wiznet", features = ["defmt"] }
 embassy-futures = { version = "0.1.0", path = "../../embassy-futures" }
 embassy-usb-logger = { version = "0.2.0", path = "../../embassy-usb-logger" }
@@ -24,6 +24,11 @@ defmt-rtt = "0.4"
 fixed = "1.23.1"
 fixed-macro = "1.2"
 
+# for web request example
+reqwless = { version = "0.12.0", features = ["defmt"] }
+serde = { version = "1.0.203", default-features = false, features = ["derive"] }
+serde-json-core = "0.5.1"
+
 #cortex-m = { version = "0.7.6", features = ["critical-section-single-core"] }
 cortex-m = { version = "0.7.6", features = ["inline-asm"] }
 cortex-m-rt = "0.7.0"

examples/rp/src/bin/wifi_webrequest.rs

@@ -0,0 +1,197 @@
+//! 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 serde::Deserialize;
+use serde_json_core;
+
+use cyw43_pio::PioSpi;
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_net::{Config, Stack, StackResources};
+use embassy_net::tcp::client::{TcpClientState, TcpClient};
+use embassy_net::dns::DnsSocket;
+use embassy_rp::bind_interrupts;
+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 static_cell::StaticCell;
+use reqwless::client::{HttpClient, TlsConfig, TlsVerify};
+use reqwless::request::Method;
+use {defmt_rtt as _, panic_probe as _};
+
+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 wifi_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 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(wifi_task(runner)));
+
+    control.init(clm).await;
+    control
+        .set_power_management(cyw43::PowerManagementMode::PowerSave)
+        .await;
+
+    let config = Config::dhcpv4(Default::default());
+    //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 = 0x0123_4567_89ab_cdef; // chosen by fair dice roll. guarenteed to be random.
+
+    // 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::<5>::new()),
+        seed,
+    ));
+
+    unwrap!(spawner.spawn(net_task(stack)));
+
+    loop {
+        //control.join_open(WIFI_NETWORK).await;
+        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";
+        // let mut http_client = HttpClient::new(&tcp_client, &dns_client); // for non-TLS requests
+        // 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;
+    }
+}