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bluer::{AdapterEvent, Device}; +use bluer::gatt::remote::Characteristic; +use futures::{pin_mut, StreamExt}; +use std::error::Error; + +const SERVICE_UUID: bluer::Uuid = bluer::Uuid::from_u128(0xadaf0900c33242a893bd25e905756cb8); +const PIXEL_DATA_UUID: bluer::Uuid = bluer::Uuid::from_u128(0xadaf0903c33242a893bd25e905756cb8); + + +#[tokio::main(flavor = "current_thread")] +async fn main() -> bluer::Result<()> { + let session = bluer::Session::new().await?; + let adapter_names = session.adapter_names().await?; + let adapter_name = adapter_names.first().expect("no Bluetooth adapter found"); + let adapter = session.adapter(adapter_name)?; + + adapter.set_powered(true).await?; + + let discover = adapter.discover_devices().await?; + pin_mut!(discover); + + while let Some(evt) = discover.next().await { + match evt { + AdapterEvent::DeviceAdded(addr) => { + let device = adapter.device(addr)?; + match find_neopixel_service(&device).await { + Ok(Some(char)) => { + send seg + println!("found characteristic"); + } + Ok(None) => { + println!("characteristic not found") + } + Err(err) => { + println!("device error : {}", &err); + let _ = adapter.remove_device(device.address()).await; + } + } + } + AdapterEvent::DeviceRemoved(addr) => { + println!("Device removed {}", addr); + } + _ => (), + } + + } + + + Ok(()) +} + +async fn connect(device: &Device, retries: u8) -> bluer::Result<()> { + if device.is_connected().await? { + return Ok(()) + } + for i in 0..retries { + match device.connect().await { + Ok(()) => return Ok(()), + Err(err) => { + println!("connection error ({}), retry…", i); + } + } + + } + + Err(bluer::Error { + kind: bluer::ErrorKind::ConnectionAttemptFailed, + message: "all attempts fail".parse().unwrap(), + }) +} + +async fn find_neopixel_service(device: &Device) -> bluer::Result> { + let addr = device.address(); + let uuids = device.uuids().await?.unwrap_or_default(); + + if uuids.contains(&SERVICE_UUID) { + println!("service neopixel found for device {}", &addr); + match connect(device, 3).await { + Ok(()) => { + println!("successefully connected"); + } + Err(err) => { + println!("unable to connect, trying new device, {}", err); + return Err(err) + } + } + for service in device.services().await? { + if SERVICE_UUID == service.uuid().await? { + for char in service.characteristics().await? { + if PIXEL_DATA_UUID == char.uuid().await? { + return Ok(Some(char)); + } + + } + } + } + + } + + Ok(None) +} \ No newline at end of file