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Iain (Bill) Wiseman 2025-04-16 15:22:10 +12:00
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.cargo/config.toml Normal file
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[target.xtensa-esp32-none-elf]
runner = "espflash flash --monitor"
[env]
ESP_LOG="info"
ESP_WIFI_CONFIG_RX_QUEUE_SIZE = "16"
ESP_WIFI_CONFIG_STATIC_RX_BUF_NUM = "32"
ESP_WIFI_CONFIG_DYNAMIC_RX_BUF_NUM = "16"
[build]
rustflags = [
"-C", "link-arg=-nostartfiles"
]
target = "xtensa-esp32-none-elf"
[unstable]
build-std = ["core", "alloc"]

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# Generated by Cargo
# will have compiled files and executables
debug/
target/
# These are backup files generated by rustfmt
**/*.rs.bk
# MSVC Windows builds of rustc generate these, which store debugging information
*.pdb
.env*

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[package]
name = "esp-emb-wifi"
version = "0.1.0"
edition = "2024"
[dependencies]
esp-alloc = "0.6.0"
esp-backtrace = { version = "0.15.1", features = [
"esp32",
"exception-handler",
"panic-handler",
"println",
] }
esp-hal = { version = "0.23.1", features = [ "esp32" ] }
esp-println = { version = "0.13.1", features = ["esp32", "log"] }
esp-wifi = { version = "0.12.0", features = ["esp32","wifi", "utils"] }
esp-hal-embassy = { version = "0.6.0", features = ["esp32"] }
cfg-if = "1.0.0"
log = { version = "0.4.22" }
static_cell = { version = "2.1.0", features = ["nightly"] }
embassy-executor = { version = "0.7.0", features = ["task-arena-size-20480"] }
embassy-futures = "0.1.1"
embedded-hal-async = "1.0.0"
embedded-io-async = { version = "0.6.1" }
embassy-net = { version = "0.6.0", features = [ "tcp", "udp", "dhcpv4", "medium-ethernet"] }
embassy-sync = "0.6.0"
embassy-time = "0.4.0"
edge-dhcp = { version = "0.5.0", git = "https://github.com/bugadani/edge-net", rev = "b72678e15bb7c6e72809df235778bb7b48ac146d" }
edge-raw = { version = "0.5.0", git = "https://github.com/bugadani/edge-net", rev = "b72678e15bb7c6e72809df235778bb7b48ac146d" }
edge-nal = { version = "0.5.0", git = "https://github.com/bugadani/edge-net", rev = "b72678e15bb7c6e72809df235778bb7b48ac146d" }
edge-nal-embassy = { version = "0.5.0", git = "https://github.com/bugadani/edge-net", rev = "b72678e15bb7c6e72809df235778bb7b48ac146d" }
[profile.release]
codegen-units = 1 # LLVM can perform better optimizations using a single thread
debug = 2
debug-assertions = false
incremental = false
lto = 'fat'
opt-level = 's'
overflow-checks = false

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Copyright 2021-2024 esp-rs
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Copyright 2021-2024 esp-rs
Permission is hereby granted, free of charge, to any
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

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# ESP Embassy Wifi Project
Welcome to the **ESP Embassy Wifi** project! This is a working example of how to configure an AP using embassy.
## Features
- Runs the software and connect to the created AP esp-wifi. This is a copy of the esp-hal project with some comments
- Tested on a Lora32 T3 v1.6.1.
## Requirements
- [espup](https://github.com/esp-rs/espup) installed
- [Rust](https://www.rust-lang.org/) installed
## Installation
1. Clone the repository:
```bash
git clone https://github.com/bibble235/esp-emb-wifi.git
```
2. Navigate to the project directory:
```bash
cd esp32-static-ip
```
3. Set the environment variables for your static IP and Wi-Fi credentials. Remember to escape special characters:
```bash
export GATEWAY_IP="10.1.1.99"
```
## Usage
Build and run the application with the following commands:
```bash
cargo build
cargo run
```
## License
This project is licensed under the [License Name]. See the [LICENSE](LICENSE) file for details.
## Demonstration
Below is a screenshot of a Lora32 T3 v1.6.1 running this application:
![Screenshot of a Lora32 T3 v1.6.1 running this app.](./assets/images/esp-emb-wifi.png)
## Contact
For questions or feedback, please contact [iwiseman@bibble.co.nz](mailto:iwiseman@bibble.co.nz).
---
![Rust](https://img.shields.io/badge/Rust-Language-black?logo=rust&logoColor=white)
![ESP32](https://img.shields.io/badge/ESP32-Microcontroller-blue)

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build.rs Normal file
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fn main() {
println!("cargo:rustc-link-arg-bins=-Tlinkall.x");
}

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[toolchain]
channel = "esp"

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#![no_std]
#![no_main]
use core::{net::Ipv4Addr, str::FromStr};
use embassy_executor::Spawner;
use embassy_net::{
tcp::TcpSocket,
IpListenEndpoint,
Ipv4Cidr,
Runner,
Stack,
StackResources,
StaticConfigV4,
};
use embassy_time::{Duration, Timer};
use esp_alloc as _;
use esp_backtrace as _;
use esp_hal::{clock::CpuClock, rng::Rng, timer::timg::TimerGroup};
use esp_println::{print, println};
use esp_wifi::{
init,
wifi::{
AccessPointConfiguration,
Configuration,
WifiApDevice,
WifiController,
WifiDevice,
WifiEvent,
WifiState,
},
EspWifiController,
};
// When you are okay with using a nightly compiler it's better to use
// https://docs.rs/static_cell/2.1.0/static_cell/macro.make_static.html
macro_rules! mk_static {
($t:ty,$val:expr) => {{
static STATIC_CELL: static_cell::StaticCell<$t> = static_cell::StaticCell::new();
#[deny(unused_attributes)]
let x = STATIC_CELL.uninit().write(($val));
x
}};
}
const GW_IP_ADDR_ENV: Option<&'static str> = option_env!("GATEWAY_IP");
#[esp_hal_embassy::main]
async fn main(spawner: Spawner) -> ! {
// Initialize the logger
esp_println::logger::init_logger_from_env();
// Initial Peripherals
let config = esp_hal::Config::default().with_cpu_clock(CpuClock::max());
let peripherals = esp_hal::init(config);
// Set up the heap allocator
esp_alloc::heap_allocator!(72 * 1024);
// Initialize Random Number Generator
let timg0 = TimerGroup::new(peripherals.TIMG0);
let mut rng = Rng::new(peripherals.RNG);
// Configure the Wi-Fi controller
// We use make static to make sure the controller is not dropped
let init = &*mk_static!(
EspWifiController<'static>,
init(timg0.timer0, rng.clone(), peripherals.RADIO_CLK).unwrap()
);
// Initialize the wifi device
let wifi = peripherals.WIFI;
let (wifi_interface, controller) =
esp_wifi::wifi::new_with_mode(&init, wifi, WifiApDevice).unwrap();
let timg1 = TimerGroup::new(peripherals.TIMG1);
esp_hal_embassy::init(timg1.timer0);
let gw_ip_addr_str = GW_IP_ADDR_ENV.unwrap_or("192.168.2.1");
println!("Using gateway {}...",gw_ip_addr_str);
let gw_ip_addr = Ipv4Addr::from_str(gw_ip_addr_str).expect("failed to parse gateway ip");
let config = embassy_net::Config::ipv4_static(StaticConfigV4 {
address: Ipv4Cidr::new(gw_ip_addr, 24),
gateway: Some(gw_ip_addr),
dns_servers: Default::default(),
});
let seed = (rng.random() as u64) << 32 | rng.random() as u64;
// Init network stack
println!("Initializing the stack");
let (stack, runner) = embassy_net::new(
wifi_interface,
config,
mk_static!(StackResources<3>, StackResources::<3>::new()),
seed,
);
spawner.spawn(connection(controller)).ok();
spawner.spawn(net_task(runner)).ok();
spawner.spawn(run_dhcp(stack, gw_ip_addr_str)).ok();
let mut rx_buffer = [0; 1536];
let mut tx_buffer = [0; 1536];
loop {
if stack.is_link_up() {
break;
}
Timer::after(Duration::from_millis(500)).await;
println!("Done Waiting half a second");
}
println!(
"Connect to the AP `esp-wifi` and point your browser to http://{gw_ip_addr_str}:8080/"
);
println!("DHCP is enabled so there's no need to configure a static IP, just in case:");
while !stack.is_config_up() {
Timer::after(Duration::from_millis(100)).await
}
stack
.config_v4()
.inspect(|c| println!("ipv4 config: {c:?}"));
let mut socket = TcpSocket::new(stack, &mut rx_buffer, &mut tx_buffer);
socket.set_timeout(Some(embassy_time::Duration::from_secs(10)));
loop {
println!("Wait for connection...");
let r = socket
.accept(IpListenEndpoint {
addr: None,
port: 8080,
})
.await;
println!("Connected...");
if let Err(e) = r {
println!("connect error: {:?}", e);
continue;
}
use embedded_io_async::Write;
let mut buffer = [0u8; 1024];
let mut pos = 0;
loop {
match socket.read(&mut buffer).await {
Ok(0) => {
println!("read EOF");
break;
}
Ok(len) => {
let to_print =
unsafe { core::str::from_utf8_unchecked(&buffer[..(pos + len)]) };
if to_print.contains("\r\n\r\n") {
print!("{}", to_print);
println!();
break;
}
pos += len;
}
Err(e) => {
println!("read error: {:?}", e);
break;
}
};
}
let r = socket
.write_all(
b"HTTP/1.0 200 OK\r\n\r\n\
<html>\
<body>\
<h1>Hello Rust! Hello esp-wifi!</h1>\
</body>\
</html>\r\n\
",
)
.await;
if let Err(e) = r {
println!("write error: {:?}", e);
}
let r = socket.flush().await;
if let Err(e) = r {
println!("flush error: {:?}", e);
}
Timer::after(Duration::from_millis(1000)).await;
socket.close();
Timer::after(Duration::from_millis(1000)).await;
socket.abort();
}
}
#[embassy_executor::task]
async fn run_dhcp(stack: Stack<'static>, gw_ip_addr: &'static str) {
use core::net::{Ipv4Addr, SocketAddrV4};
use edge_dhcp::{
io::{self, DEFAULT_SERVER_PORT},
server::{Server, ServerOptions},
};
use edge_nal::UdpBind;
use edge_nal_embassy::{Udp, UdpBuffers};
let ip = Ipv4Addr::from_str(gw_ip_addr).expect("dhcp task failed to parse gw ip");
let mut buf = [0u8; 1500];
let mut gw_buf = [Ipv4Addr::UNSPECIFIED];
let buffers = UdpBuffers::<3, 1024, 1024, 10>::new();
let unbound_socket = Udp::new(stack, &buffers);
let mut bound_socket = unbound_socket
.bind(core::net::SocketAddr::V4(SocketAddrV4::new(
Ipv4Addr::UNSPECIFIED,
DEFAULT_SERVER_PORT,
)))
.await
.unwrap();
loop {
_ = io::server::run(
&mut Server::<_, 64>::new_with_et(ip),
&ServerOptions::new(ip, Some(&mut gw_buf)),
&mut bound_socket,
&mut buf,
)
.await
.inspect_err(|e| log::warn!("DHCP server error: {e:?}"));
Timer::after(Duration::from_millis(500)).await;
}
}
#[embassy_executor::task]
async fn connection(mut controller: WifiController<'static>) {
// Monitor the wifi state
// and start the AP if it is not started
println!("start connection task");
println!("Device capabilities: {:?}", controller.capabilities());
loop {
match esp_wifi::wifi::wifi_state() {
WifiState::ApStarted => {
// wait until we're no longer connected
controller.wait_for_event(WifiEvent::ApStop).await;
Timer::after(Duration::from_millis(5000)).await
}
_ => {}
}
if !matches!(controller.is_started(), Ok(true)) {
let client_config = Configuration::AccessPoint(AccessPointConfiguration {
ssid: "esp-wifi".try_into().unwrap(),
..Default::default()
});
controller.set_configuration(&client_config).unwrap();
println!("Starting wifi");
controller.start_async().await.unwrap();
println!("Wifi started!");
}
}
}
#[embassy_executor::task]
async fn net_task(mut runner: Runner<'static, WifiDevice<'static, WifiApDevice>>) {
runner.run().await
}