WIP embassy-net v2

7 files changed, 240 insertions, 256 deletions

diff --git a/examples/nrf/src/bin/usb_ethernet.rs b/examples/nrf/src/bin/usb_ethernet.rs
index 843487c03..49f2fb89a 100644
--- a/examples/nrf/src/bin/usb_ethernet.rs
+++ b/examples/nrf/src/bin/usb_ethernet.rs
@@ -12,8 +12,9 @@ use embassy::channel::Channel;
 use embassy::executor::Spawner;
 use embassy::util::Forever;
 use embassy_net::tcp::TcpSocket;
-use embassy_net::{PacketBox, PacketBoxExt, PacketBuf};
+use embassy_net::{PacketBox, PacketBoxExt, PacketBuf, Stack, StackResources};
 use embassy_nrf::pac;
+use embassy_nrf::rng::Rng;
 use embassy_nrf::usb::Driver;
 use embassy_nrf::Peripherals;
 use embassy_nrf::{interrupt, peripherals};
@@ -27,6 +28,14 @@ use panic_probe as _;
 
 type MyDriver = Driver<'static, peripherals::USBD>;
 
+macro_rules! forever {
+    ($val:expr) => {{
+        type T = impl Sized;
+        static FOREVER: Forever<T> = Forever::new();
+        FOREVER.put_with(move || $val)
+    }};
+}
+
 #[embassy::task]
 async fn usb_task(mut device: UsbDevice<'static, MyDriver>) -> ! {
     device.run().await
@@ -72,8 +81,8 @@ async fn usb_ncm_tx_task(mut class: Sender<'static, MyDriver>) {
 }
 
 #[embassy::task]
-async fn net_task() -> ! {
-    embassy_net::run().await
+async fn net_task(stack: &'static Stack<Device>) -> ! {
+    stack.run().await
 }
 
 #[embassy::main]
@@ -114,8 +123,7 @@ async fn main(spawner: Spawner, p: Peripherals) {
         control_buf: [u8; 128],
         serial_state: State<'static>,
     }
-    static RESOURCES: Forever<Resources> = Forever::new();
-    let res = RESOURCES.put(Resources {
+    let res: &mut Resources = forever!(Resources {
         device_descriptor: [0; 256],
         config_descriptor: [0; 256],
         bos_descriptor: [0; 256],
@@ -158,28 +166,31 @@ async fn main(spawner: Spawner, p: Peripherals) {
     unwrap!(spawner.spawn(usb_ncm_rx_task(rx)));
     unwrap!(spawner.spawn(usb_ncm_tx_task(tx)));
 
-    // Init embassy-net
-    struct NetResources {
-        resources: embassy_net::StackResources<1, 2, 8>,
-        configurator: embassy_net::DhcpConfigurator,
-        //configurator: StaticConfigurator,
-        device: Device,
-    }
-    static NET_RESOURCES: Forever<NetResources> = Forever::new();
-    let res = NET_RESOURCES.put(NetResources {
-        resources: embassy_net::StackResources::new(),
-        configurator: embassy_net::DhcpConfigurator::new(),
-        //configurator: embassy_net::StaticConfigurator::new(embassy_net::Config {
-        //    address: Ipv4Cidr::new(Ipv4Address::new(10, 42, 0, 1), 24),
-        //    dns_servers: Default::default(),
-        //    gateway: None,
-        //}),
-        device: Device {
-            mac_addr: our_mac_addr,
-        },
-    });
-    embassy_net::init(&mut res.device, &mut res.configurator, &mut res.resources);
-    unwrap!(spawner.spawn(net_task()));
+    let config = embassy_net::ConfigStrategy::Dhcp;
+    //let config = embassy_net::ConfigStrategy::Static(embassy_net::Config {
+    //    address: Ipv4Cidr::new(Ipv4Address::new(10, 42, 0, 61), 24),
+    //    dns_servers: Vec::new(),
+    //    gateway: Some(Ipv4Address::new(10, 42, 0, 1)),
+    //});
+
+    // Generate random seed
+    let mut rng = Rng::new(p.RNG, interrupt::take!(RNG));
+    let mut seed = [0; 8];
+    rng.blocking_fill_bytes(&mut seed);
+    let seed = u64::from_le_bytes(seed);
+
+    // Init network stack
+    let device = Device {
+        mac_addr: our_mac_addr,
+    };
+    let stack = &*forever!(Stack::new(
+        device,
+        config,
+        forever!(StackResources::<1, 2, 8>::new()),
+        seed
+    ));
+
+    unwrap!(spawner.spawn(net_task(stack)));
 
     // And now we can use it!
 
@@ -188,7 +199,7 @@ async fn main(spawner: Spawner, p: Peripherals) {
     let mut buf = [0; 4096];
 
     loop {
-        let mut socket = TcpSocket::new(&mut rx_buffer, &mut tx_buffer);
+        let mut socket = TcpSocket::new(stack, &mut rx_buffer, &mut tx_buffer);
         socket.set_timeout(Some(embassy_net::SmolDuration::from_secs(10)));
 
         info!("Listening on TCP:1234...");
@@ -246,7 +257,7 @@ impl embassy_net::Device for Device {
         }
     }
 
-    fn capabilities(&mut self) -> embassy_net::DeviceCapabilities {
+    fn capabilities(&self) -> embassy_net::DeviceCapabilities {
         let mut caps = embassy_net::DeviceCapabilities::default();
         caps.max_transmission_unit = 1514; // 1500 IP + 14 ethernet header
         caps.medium = embassy_net::Medium::Ethernet;
@@ -271,9 +282,3 @@ impl embassy_net::Device for Device {
         self.mac_addr
     }
 }
-
-#[no_mangle]
-fn _embassy_rand(buf: &mut [u8]) {
-    // TODO
-    buf.fill(0x42)
-}
diff --git a/examples/std/src/bin/net.rs b/examples/std/src/bin/net.rs
index daedffb0f..74073ee81 100644
--- a/examples/std/src/bin/net.rs
+++ b/examples/std/src/bin/net.rs
@@ -4,23 +4,24 @@ use clap::Parser;
 use embassy::executor::{Executor, Spawner};
 use embassy::util::Forever;
 use embassy_net::tcp::TcpSocket;
-use embassy_net::{
-    Config, Configurator, DhcpConfigurator, Ipv4Address, Ipv4Cidr, StackResources,
-    StaticConfigurator,
-};
+use embassy_net::{ConfigStrategy, Ipv4Address, Ipv4Cidr, Stack, StackResources};
 use embedded_io::asynch::Write;
 use heapless::Vec;
 use log::*;
+use rand_core::{OsRng, RngCore};
 
 #[path = "../tuntap.rs"]
 mod tuntap;
 
 use crate::tuntap::TunTapDevice;
 
-static DEVICE: Forever<TunTapDevice> = Forever::new();
-static CONFIG_STATIC: Forever<StaticConfigurator> = Forever::new();
-static CONFIG_DYNAMIC: Forever<DhcpConfigurator> = Forever::new();
-static NET_RESOURCES: Forever<StackResources<1, 2, 8>> = Forever::new();
+macro_rules! forever {
+    ($val:expr) => {{
+        type T = impl Sized;
+        static FOREVER: Forever<T> = Forever::new();
+        FOREVER.put_with(move || $val)
+    }};
+}
 
 #[derive(Parser)]
 #[clap(version = "1.0")]
@@ -34,8 +35,8 @@ struct Opts {
 }
 
 #[embassy::task]
-async fn net_task() {
-    embassy_net::run().await
+async fn net_task(stack: &'static Stack<TunTapDevice>) -> ! {
+    stack.run().await
 }
 
 #[embassy::task]
@@ -46,28 +47,36 @@ async fn main_task(spawner: Spawner) {
     let device = TunTapDevice::new(&opts.tap).unwrap();
 
     // Choose between dhcp or static ip
-    let config: &'static mut dyn Configurator = if opts.static_ip {
-        CONFIG_STATIC.put(StaticConfigurator::new(Config {
+    let config = if opts.static_ip {
+        ConfigStrategy::Static(embassy_net::Config {
             address: Ipv4Cidr::new(Ipv4Address::new(192, 168, 69, 2), 24),
             dns_servers: Vec::new(),
             gateway: Some(Ipv4Address::new(192, 168, 69, 1)),
-        }))
+        })
     } else {
-        CONFIG_DYNAMIC.put(DhcpConfigurator::new())
+        ConfigStrategy::Dhcp
     };
 
-    let net_resources = StackResources::new();
+    // Generate random seed
+    let mut seed = [0; 8];
+    OsRng.fill_bytes(&mut seed);
+    let seed = u64::from_le_bytes(seed);
 
     // Init network stack
-    embassy_net::init(DEVICE.put(device), config, NET_RESOURCES.put(net_resources));
+    let stack = &*forever!(Stack::new(
+        device,
+        config,
+        forever!(StackResources::<1, 2, 8>::new()),
+        seed
+    ));
 
     // Launch network task
-    spawner.spawn(net_task()).unwrap();
+    spawner.spawn(net_task(stack)).unwrap();
 
     // Then we can use it!
     let mut rx_buffer = [0; 4096];
     let mut tx_buffer = [0; 4096];
-    let mut socket = TcpSocket::new(&mut rx_buffer, &mut tx_buffer);
+    let mut socket = TcpSocket::new(stack, &mut rx_buffer, &mut tx_buffer);
 
     socket.set_timeout(Some(embassy_net::SmolDuration::from_secs(10)));
 
@@ -88,12 +97,6 @@ async fn main_task(spawner: Spawner) {
     }
 }
 
-#[no_mangle]
-fn _embassy_rand(buf: &mut [u8]) {
-    use rand_core::{OsRng, RngCore};
-    OsRng.fill_bytes(buf);
-}
-
 static EXECUTOR: Forever<Executor> = Forever::new();
 
 fn main() {
diff --git a/examples/std/src/tuntap.rs b/examples/std/src/tuntap.rs
index 09a4be070..b70767a3a 100644
--- a/examples/std/src/tuntap.rs
+++ b/examples/std/src/tuntap.rs
@@ -209,7 +209,7 @@ impl Device for TunTapDevice {
         }
     }
 
-    fn capabilities(&mut self) -> DeviceCapabilities {
+    fn capabilities(&self) -> DeviceCapabilities {
         let mut caps = DeviceCapabilities::default();
         caps.max_transmission_unit = self.device.get_ref().mtu;
         caps
diff --git a/examples/stm32f7/Cargo.toml b/examples/stm32f7/Cargo.toml
index e68d1d58c..cd7394a5c 100644
--- a/examples/stm32f7/Cargo.toml
+++ b/examples/stm32f7/Cargo.toml
@@ -8,7 +8,7 @@ resolver = "2"
 [dependencies]
 embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt", "defmt-timestamp-uptime"] }
 embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["nightly", "defmt", "net", "stm32f767zi", "unstable-pac", "time-driver-any", "exti"]  }
-embassy-net = { path = "../../embassy-net", features = ["defmt", "tcp", "medium-ethernet", "pool-16"] }
+embassy-net = { path = "../../embassy-net", features = ["defmt", "tcp", "dhcpv4", "medium-ethernet", "pool-16"] }
 embedded-io = { version = "0.3.0", features = ["async"] }
 
 defmt = "0.3"
@@ -24,8 +24,3 @@ nb = "1.0.0"
 rand_core = "0.6.3"
 critical-section = "0.2.3"
 embedded-storage = "0.3.0"
-
-[dependencies.smoltcp]
-version = "0.8.0"
-default-features = false
-features = ["defmt"]
diff --git a/examples/stm32f7/src/bin/eth.rs b/examples/stm32f7/src/bin/eth.rs
index dca9338b2..af012f826 100644
--- a/examples/stm32f7/src/bin/eth.rs
+++ b/examples/stm32f7/src/bin/eth.rs
@@ -2,130 +2,123 @@
 #![no_main]
 #![feature(type_alias_impl_trait)]
 
-use cortex_m_rt::entry;
 use defmt::*;
-use embassy::executor::{Executor, Spawner};
+use embassy::executor::Spawner;
 use embassy::time::{Duration, Timer};
 use embassy::util::Forever;
 use embassy_net::tcp::TcpSocket;
-use embassy_net::{Config as NetConfig, Ipv4Address, Ipv4Cidr, StackResources, StaticConfigurator};
+use embassy_net::{Ipv4Address, Stack, StackResources};
 use embassy_stm32::eth::generic_smi::GenericSMI;
 use embassy_stm32::eth::{Ethernet, State};
-use embassy_stm32::interrupt;
 use embassy_stm32::peripherals::ETH;
-use embassy_stm32::peripherals::RNG;
 use embassy_stm32::rng::Rng;
 use embassy_stm32::time::U32Ext;
 use embassy_stm32::Config;
+use embassy_stm32::{interrupt, Peripherals};
 use embedded_io::asynch::Write;
-use heapless::Vec;
 
 use defmt_rtt as _; // global logger
 use panic_probe as _;
-
-#[embassy::task]
-async fn main_task(
-    device: &'static mut Ethernet<'static, ETH, GenericSMI, 4, 4>,
-    config: &'static mut StaticConfigurator,
-    spawner: Spawner,
-) {
-    let net_resources = NET_RESOURCES.put(StackResources::new());
-
-    // Init network stack
-    embassy_net::init(device, config, net_resources);
-
-    // Launch network task
-    unwrap!(spawner.spawn(net_task()));
-
-    info!("Network task initialized");
-
-    // Then we can use it!
-    let mut rx_buffer = [0; 1024];
-    let mut tx_buffer = [0; 1024];
-    let mut socket = TcpSocket::new(&mut rx_buffer, &mut tx_buffer);
-
-    socket.set_timeout(Some(embassy_net::SmolDuration::from_secs(10)));
-
-    let remote_endpoint = (Ipv4Address::new(192, 168, 0, 10), 8000);
-    let r = socket.connect(remote_endpoint).await;
-    if let Err(e) = r {
-        info!("connect error: {:?}", e);
-        return;
-    }
-    info!("connected!");
-    loop {
-        let r = socket.write_all(b"Hello\n").await;
-        if let Err(e) = r {
-            info!("write error: {:?}", e);
-            return;
-        }
-        Timer::after(Duration::from_secs(1)).await;
-    }
-}
-
-#[embassy::task]
-async fn net_task() {
-    embassy_net::run().await
+use rand_core::RngCore;
+
+macro_rules! forever {
+    ($val:expr) => {{
+        type T = impl Sized;
+        static FOREVER: Forever<T> = Forever::new();
+        FOREVER.put_with(move || $val)
+    }};
 }
 
-#[no_mangle]
-fn _embassy_rand(buf: &mut [u8]) {
-    use rand_core::RngCore;
+type Device = Ethernet<'static, ETH, GenericSMI, 4, 4>;
 
-    critical_section::with(|_| unsafe {
-        unwrap!(RNG_INST.as_mut()).fill_bytes(buf);
-    });
+#[embassy::task]
+async fn net_task(stack: &'static Stack<Device>) -> ! {
+    stack.run().await
 }
 
-static mut RNG_INST: Option<Rng<RNG>> = None;
-
-static EXECUTOR: Forever<Executor> = Forever::new();
-static STATE: Forever<State<'static, ETH, 4, 4>> = Forever::new();
-static ETH: Forever<Ethernet<'static, ETH, GenericSMI, 4, 4>> = Forever::new();
-static CONFIG: Forever<StaticConfigurator> = Forever::new();
-static NET_RESOURCES: Forever<StackResources<1, 2, 8>> = Forever::new();
-
 fn config() -> Config {
     let mut config = Config::default();
     config.rcc.sys_ck = Some(200.mhz().into());
     config
 }
 
-#[entry]
-fn main() -> ! {
+#[embassy::main(config = "config()")]
+async fn main(spawner: Spawner, p: Peripherals) -> ! {
     info!("Hello World!");
 
-    info!("Setup RCC...");
-
-    let p = embassy_stm32::init(config());
-
-    let rng = Rng::new(p.RNG);
-    unsafe {
-        RNG_INST.replace(rng);
-    }
+    // Generate random seed.
+    let mut rng = Rng::new(p.RNG);
+    let mut seed = [0; 8];
+    rng.fill_bytes(&mut seed);
+    let seed = u64::from_le_bytes(seed);
 
     let eth_int = interrupt::take!(ETH);
     let mac_addr = [0x00, 0x00, 0xDE, 0xAD, 0xBE, 0xEF];
-    let state = STATE.put(State::new());
 
-    let eth = unsafe {
-        ETH.put(Ethernet::new(
-            state, p.ETH, eth_int, p.PA1, p.PA2, p.PC1, p.PA7, p.PC4, p.PC5, p.PG13, p.PB13,
-            p.PG11, GenericSMI, mac_addr, 0,
-        ))
+    let device = unsafe {
+        Ethernet::new(
+            forever!(State::new()),
+            p.ETH,
+            eth_int,
+            p.PA1,
+            p.PA2,
+            p.PC1,
+            p.PA7,
+            p.PC4,
+            p.PC5,
+            p.PG13,
+            p.PB13,
+            p.PG11,
+            GenericSMI,
+            mac_addr,
+            0,
+        )
     };
 
-    let config = StaticConfigurator::new(NetConfig {
-        address: Ipv4Cidr::new(Ipv4Address::new(192, 168, 0, 61), 24),
-        dns_servers: Vec::new(),
-        gateway: Some(Ipv4Address::new(192, 168, 0, 1)),
-    });
+    let config = embassy_net::ConfigStrategy::Dhcp;
+    //let config = embassy_net::ConfigStrategy::Static(embassy_net::Config {
+    //    address: Ipv4Cidr::new(Ipv4Address::new(10, 42, 0, 61), 24),
+    //    dns_servers: Vec::new(),
+    //    gateway: Some(Ipv4Address::new(10, 42, 0, 1)),
+    //});
 
-    let config = CONFIG.put(config);
+    // Init network stack
+    let stack = &*forever!(Stack::new(
+        device,
+        config,
+        forever!(StackResources::<1, 2, 8>::new()),
+        seed
+    ));
 
-    let executor = EXECUTOR.put(Executor::new());
+    // Launch network task
+    unwrap!(spawner.spawn(net_task(&stack)));
 
-    executor.run(move |spawner| {
-        unwrap!(spawner.spawn(main_task(eth, config, spawner)));
-    })
+    info!("Network task initialized");
+
+    // Then we can use it!
+    let mut rx_buffer = [0; 1024];
+    let mut tx_buffer = [0; 1024];
+
+    loop {
+        let mut socket = TcpSocket::new(&stack, &mut rx_buffer, &mut tx_buffer);
+
+        socket.set_timeout(Some(embassy_net::SmolDuration::from_secs(10)));
+
+        let remote_endpoint = (Ipv4Address::new(10, 42, 0, 1), 8000);
+        info!("connecting...");
+        let r = socket.connect(remote_endpoint).await;
+        if let Err(e) = r {
+            info!("connect error: {:?}", e);
+            continue;
+        }
+        info!("connected!");
+        loop {
+            let r = socket.write_all(b"Hello\n").await;
+            if let Err(e) = r {
+                info!("write error: {:?}", e);
+                return;
+            }
+            Timer::after(Duration::from_secs(1)).await;
+        }
+    }
 }
diff --git a/examples/stm32h7/Cargo.toml b/examples/stm32h7/Cargo.toml
index 8aa3b31e0..0f480f7a8 100644
--- a/examples/stm32h7/Cargo.toml
+++ b/examples/stm32h7/Cargo.toml
@@ -8,7 +8,7 @@ resolver = "2"
 [dependencies]
 embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt", "defmt-timestamp-uptime", "unstable-traits"] }
 embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["nightly", "defmt", "stm32h743bi", "net", "time-driver-any", "exti", "unstable-pac", "unstable-traits"] }
-embassy-net = { path = "../../embassy-net", features = ["defmt", "tcp", "medium-ethernet", "pool-16"] }
+embassy-net = { path = "../../embassy-net", features = ["defmt", "tcp", "dhcpv4", "medium-ethernet", "pool-16"] }
 embedded-io = { version = "0.3.0", features = ["async"] }
 
 defmt = "0.3"
@@ -28,11 +28,6 @@ micromath = "2.0.0"
 stm32-fmc = "0.2.4"
 embedded-storage = "0.3.0"
 
-[dependencies.smoltcp]
-version = "0.8.0"
-default-features = false
-features = ["defmt"]
-
 # cargo build/run
 [profile.dev]
 codegen-units = 1
diff --git a/examples/stm32h7/src/bin/eth.rs b/examples/stm32h7/src/bin/eth.rs
index 8ece29403..649ff2605 100644
--- a/examples/stm32h7/src/bin/eth.rs
+++ b/examples/stm32h7/src/bin/eth.rs
@@ -2,90 +2,40 @@
 #![no_main]
 #![feature(type_alias_impl_trait)]
 
-use defmt_rtt as _; // global logger
-use panic_probe as _;
-
-use cortex_m_rt::entry;
 use defmt::*;
-use embassy::executor::{Executor, Spawner};
+use embassy::executor::Spawner;
 use embassy::time::{Duration, Timer};
 use embassy::util::Forever;
 use embassy_net::tcp::TcpSocket;
-use embassy_net::{Config as NetConfig, Ipv4Address, Ipv4Cidr, StackResources, StaticConfigurator};
+use embassy_net::{Ipv4Address, Stack, StackResources};
 use embassy_stm32::eth::generic_smi::GenericSMI;
 use embassy_stm32::eth::{Ethernet, State};
-use embassy_stm32::interrupt;
 use embassy_stm32::peripherals::ETH;
-use embassy_stm32::peripherals::RNG;
 use embassy_stm32::rng::Rng;
 use embassy_stm32::time::U32Ext;
 use embassy_stm32::Config;
+use embassy_stm32::{interrupt, Peripherals};
 use embedded_io::asynch::Write;
-use heapless::Vec;
-
-#[embassy::task]
-async fn main_task(
-    device: &'static mut Ethernet<'static, ETH, GenericSMI, 4, 4>,
-    config: &'static mut StaticConfigurator,
-    spawner: Spawner,
-) {
-    let net_resources = NET_RESOURCES.put(StackResources::new());
-
-    // Init network stack
-    embassy_net::init(device, config, net_resources);
-
-    // Launch network task
-    unwrap!(spawner.spawn(net_task()));
-
-    info!("Network task initialized");
-
-    // Then we can use it!
-    let mut rx_buffer = [0; 1024];
-    let mut tx_buffer = [0; 1024];
-    let mut socket = TcpSocket::new(&mut rx_buffer, &mut tx_buffer);
-
-    socket.set_timeout(Some(embassy_net::SmolDuration::from_secs(10)));
-
-    let remote_endpoint = (Ipv4Address::new(192, 168, 0, 10), 8000);
-    let r = socket.connect(remote_endpoint).await;
-    if let Err(e) = r {
-        info!("connect error: {:?}", e);
-        return;
-    }
-    info!("connected!");
-    loop {
-        let r = socket.write_all(b"Hello\n").await;
-        if let Err(e) = r {
-            info!("write error: {:?}", e);
-            return;
-        }
-        Timer::after(Duration::from_secs(1)).await;
-    }
-}
 
-#[embassy::task]
-async fn net_task() {
-    embassy_net::run().await
+use defmt_rtt as _; // global logger
+use panic_probe as _;
+use rand_core::RngCore;
+
+macro_rules! forever {
+    ($val:expr) => {{
+        type T = impl Sized;
+        static FOREVER: Forever<T> = Forever::new();
+        FOREVER.put_with(move || $val)
+    }};
 }
 
-#[no_mangle]
-fn _embassy_rand(buf: &mut [u8]) {
-    use rand_core::RngCore;
+type Device = Ethernet<'static, ETH, GenericSMI, 4, 4>;
 
-    critical_section::with(|_| unsafe {
-        unwrap!(RNG_INST.as_mut()).fill_bytes(buf);
-    });
+#[embassy::task]
+async fn net_task(stack: &'static Stack<Device>) -> ! {
+    stack.run().await
 }
 
-static mut RNG_INST: Option<Rng<RNG>> = None;
-
-static EXECUTOR: Forever<Executor> = Forever::new();
-static STATE: Forever<State<'static, ETH, 4, 4>> = Forever::new();
-static ETH: Forever<Ethernet<'static, ETH, GenericSMI, 4, 4>> = Forever::new();
-static CONFIG: Forever<StaticConfigurator> = Forever::new();
-static NET_RESOURCES: Forever<StackResources<1, 2, 8>> = Forever::new();
-
-#[allow(unused)]
 pub fn config() -> Config {
     let mut config = Config::default();
     config.rcc.sys_ck = Some(400.mhz().into());
@@ -94,40 +44,83 @@ pub fn config() -> Config {
     config
 }
 
-#[entry]
-fn main() -> ! {
+#[embassy::main(config = "config()")]
+async fn main(spawner: Spawner, p: Peripherals) -> ! {
     info!("Hello World!");
 
-    info!("Setup RCC...");
-
-    let p = embassy_stm32::init(config());
-
-    let rng = Rng::new(p.RNG);
-    unsafe {
-        RNG_INST.replace(rng);
-    }
+    // Generate random seed.
+    let mut rng = Rng::new(p.RNG);
+    let mut seed = [0; 8];
+    rng.fill_bytes(&mut seed);
+    let seed = u64::from_le_bytes(seed);
 
     let eth_int = interrupt::take!(ETH);
-    let mac_addr = [0x10; 6];
-    let state = STATE.put(State::new());
-    let eth = unsafe {
-        ETH.put(Ethernet::new(
-            state, p.ETH, eth_int, p.PA1, p.PA2, p.PC1, p.PA7, p.PC4, p.PC5, p.PG13, p.PB13,
-            p.PG11, GenericSMI, mac_addr, 0,
-        ))
+    let mac_addr = [0x00, 0x00, 0xDE, 0xAD, 0xBE, 0xEF];
+
+    let device = unsafe {
+        Ethernet::new(
+            forever!(State::new()),
+            p.ETH,
+            eth_int,
+            p.PA1,
+            p.PA2,
+            p.PC1,
+            p.PA7,
+            p.PC4,
+            p.PC5,
+            p.PG13,
+            p.PB13,
+            p.PG11,
+            GenericSMI,
+            mac_addr,
+            0,
+        )
     };
 
-    let config = StaticConfigurator::new(NetConfig {
-        address: Ipv4Cidr::new(Ipv4Address::new(192, 168, 0, 61), 24),
-        dns_servers: Vec::new(),
-        gateway: Some(Ipv4Address::new(192, 168, 0, 1)),
-    });
+    let config = embassy_net::ConfigStrategy::Dhcp;
+    //let config = embassy_net::ConfigStrategy::Static(embassy_net::Config {
+    //    address: Ipv4Cidr::new(Ipv4Address::new(10, 42, 0, 61), 24),
+    //    dns_servers: Vec::new(),
+    //    gateway: Some(Ipv4Address::new(10, 42, 0, 1)),
+    //});
+
+    // Init network stack
+    let stack = &*forever!(Stack::new(
+        device,
+        config,
+        forever!(StackResources::<1, 2, 8>::new()),
+        seed
+    ));
 
-    let config = CONFIG.put(config);
+    // Launch network task
+    unwrap!(spawner.spawn(net_task(&stack)));
 
-    let executor = EXECUTOR.put(Executor::new());
+    info!("Network task initialized");
 
-    executor.run(move |spawner| {
-        unwrap!(spawner.spawn(main_task(eth, config, spawner)));
-    })
+    // Then we can use it!
+    let mut rx_buffer = [0; 1024];
+    let mut tx_buffer = [0; 1024];
+
+    loop {
+        let mut socket = TcpSocket::new(&stack, &mut rx_buffer, &mut tx_buffer);
+
+        socket.set_timeout(Some(embassy_net::SmolDuration::from_secs(10)));
+
+        let remote_endpoint = (Ipv4Address::new(10, 42, 0, 1), 8000);
+        info!("connecting...");
+        let r = socket.connect(remote_endpoint).await;
+        if let Err(e) = r {
+            info!("connect error: {:?}", e);
+            continue;
+        }
+        info!("connected!");
+        loop {
+            let r = socket.write_all(b"Hello\n").await;
+            if let Err(e) = r {
+                info!("write error: {:?}", e);
+                return;
+            }
+            Timer::after(Duration::from_secs(1)).await;
+        }
+    }
 }