add small routine to send data

src/main.rs

@@ -1,7 +1,8 @@
 use bluer::{AdapterEvent, Device};
 use bluer::gatt::remote::Characteristic;
 use futures::{pin_mut, StreamExt};
-use std::error::Error;
+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);
@@ -25,8 +26,12 @@ async fn main() -> bluer::Result<()> {
                 let device = adapter.device(addr)?;
                 match find_neopixel_service(&device).await {
                     Ok(Some(char)) => {
-                        send_seq(char)
                         println!("found characteristic");
+                        match send_seq(&char).await {
+                            // this loop should never stop
+                            _ => ()
+                        }
+
                     }
                     Ok(None) => {
                         println!("characteristic not found")
@@ -49,13 +54,24 @@ async fn main() -> bluer::Result<()> {
     Ok(())
 }
 
-async fn send_seq(char: &Characteristic) -> {
+async fn send_seq(char: &Characteristic) -> bluer::Result<()> {
     println!("  Characteristic flags : {:?}, ", char.flags().await?);
 
-    let base_data = vec![0x00, 0x00, 0x01];
-    for i in 0..10 {
-#         base_data.
+    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<()> {
@@ -65,7 +81,7 @@ async fn connect(device: &Device, retries: u8) -> bluer::Result<()> {
     for i in 0..retries {
         match device.connect().await {
             Ok(()) => return Ok(()),
-            Err(err) => {
+            Err(_) => {
                 println!("connection error ({}), retry…", i);
             }
         }