fix(linux-rust): Retry L2CAP send on ENOTCONN during BlueZ Handshake (#495)

This fix allows the send thread to make 10 attempts to send it's data.
This gives access to seeing the battery status

linux-rust/src/bluetooth/aacp.rs

@@ -1233,11 +1233,23 @@ async fn recv_thread(manager: AACPManager, sp: Arc<SeqPacket>) {
 
 async fn send_thread(mut rx: mpsc::Receiver<Vec<u8>>, sp: Arc<SeqPacket>) {
     while let Some(data) = rx.recv().await {
-        if let Err(e) = sp.send(&data).await {
-            error!("Failed to send data: {}", e);
-            break;
+        let mut attempts = 0;
+        loop {
+          match sp.send(&data).await {
+            Ok(_) => {
+              debug!("Sent {} bytes: {}", data.len(), hex::encode(&data));
+              break;
+            }
+            Err(e) if e.raw_os_error() == Some(107) && attempts < 10 => {
+              attempts += 1;
+              sleep(Duration::from_millis(100)).await;
+            }
+            Err(e) => {
+              error!("Failed to send data: {}", e);
+              return;
+            }
+          }
         }
-        debug!("Sent {} bytes: {}", data.len(), hex::encode(&data));
     }
     info!("Send thread finished.");
 }