Bluetooth Low Energy Generic Attribute Profile

ref BLUETOOTH CORE SPECIFICATION Version 5.1 | Vol 3, Part G Generic Attribute Profile (GATT)

Example

use gatt::{CharacteristicProperties, Registration, Server};
use gatt::services as srv;
use gatt::characteristics as ch;

#[derive(Debug, Clone, PartialEq, Eq, Hash)]
enum Token {
DeviceName,
BatteryLevelNotify,
}

fn new_registration() -> Registration<Token> {
let mut registration = Registration::new();

registration.add_primary_service(srv::GENERIC_ACCESS);
registration.add_characteristic_with_token(
Token::DeviceName,
ch::DEVICE_NAME,
"abc",
CharacteristicProperties::WRITE,
);
registration.add_characteristic(
ch::APPEARANCE,
0x03c0u16.to_le_bytes().to_vec(),
CharacteristicProperties::READ,
);

registration.add_primary_service(srv::GENERIC_ATTRIBUTE);
registration.add_characteristic(
ch::SERVICE_CHANGED,
"",
CharacteristicProperties::INDICATE,
);

registration.add_primary_service(srv::DEVICE_INFORMATION);
registration.add_characteristic(
ch::MANUFACTURER_NAME_STRING,
"機械",
CharacteristicProperties::READ,
);
registration.add_characteristic(
ch::MODEL_NUMBER_STRING,
"A123",
CharacteristicProperties::READ,
);
registration.add_characteristic(
ch::SERIAL_NUMBER_STRING,
"333-444",
CharacteristicProperties::READ,
);

registration.add_primary_service(srv::BATTERY);
registration.add_characteristic_with_token(
Token::BatteryLevelNotify,
ch::BATTERY_LEVEL,
"",
CharacteristicProperties::NOTIFY,
);

registration
}

#[tokio::main(flavor = "current_thread")]
async fn main() -> anyhow::Result<()> {
use std::io::stdin;
use tokio::task::spawn_blocking;

let server = Server::bind()?;
/*
let connection = server.accept().await?;
let (task, outgoing, mut events) = connection.run(new_registration());
let mut task = tokio::spawn(task);

let mut n = 0;
loop {
tokio::select! {
r = Pin::new(&mut task) => r??,

maybe_line = spawn_blocking(|| stdin().read_line(&mut String::new())) => {
maybe_line??;
outgoing.notify(&Token::BatteryLevelNotify, vec![n])?;
n += 1;
}

event = events.next() => {
if let Some(event) = event {
println!("{:?}", event);
}
}
}
}
*/
// ...
# Ok(())
}

Supported target

• x86_64-unknown-linux-gnu

Tested on Linux 5.9 (Arch Linux)

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT) at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.!