add small routine to send data

[x] connect to the device
 [x] find service and characteristic

.gitignore

@@ -4,10 +4,8 @@
 debug/
 target/
 
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
 
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+[package]
+name = "rust_lum"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bluer = "0.13.1"
+tokio = "1.15.0"
+futures = "0.3.19"

src/main.rs

@@ -0,0 +1,126 @@
+use bluer::{AdapterEvent, Device};
+use bluer::gatt::remote::Characteristic;
+use futures::{pin_mut, StreamExt};
+use std::time::Duration;
+use tokio::time::sleep;
+
+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)) => {
+                        println!("found characteristic");
+                        match send_seq(&char).await {
+                            // this loop should never stop
+                            _ => ()
+                        }
+
+                    }
+                    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 send_seq(char: &Characteristic) -> bluer::Result<()> {
+    println!("  Characteristic flags : {:?}, ", char.flags().await?);
+
+    let mut base_data: Vec<u8> = vec![0x00, 0x00, 0x01];
+    let mut off_data: Vec<u8> =  vec![0x00, 0x00, 0x01];
+    for _ in 0..10 {
+        base_data.append(&mut vec![0xff, 0x00, 0x00]);
+        off_data.append(&mut vec![0x00, 0x00, 0x00]);
+    }
+
+    loop {
+        char.write(&*base_data).await?;
+        sleep(Duration::from_secs(1)).await;
+        char.write(&*off_data).await?;
+        sleep(Duration::from_secs(1)).await;
+
+    }
+
+}
+
+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(_) => {
+                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<Option<Characteristic>> {
+    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)
+}