linux-rust: implement basic connections

linux-rust/src/bluetooth/discovery.rs

@@ -0,0 +1,20 @@
+use std::io::Error;
+
+pub(crate) async fn find_connected_airpods(adapter: &bluer::Adapter) -> bluer::Result<bluer::Device> {
+    let target_uuid = uuid::Uuid::parse_str("74ec2172-0bad-4d01-8f77-997b2be0722a").unwrap();
+
+    let addrs = adapter.device_addresses().await?;
+    for addr in addrs {
+        let device = adapter.device(addr)?;
+        if device.is_connected().await.unwrap_or(false) {
+            if let Ok(uuids) = device.uuids().await {
+                if let Some(uuids) = uuids {
+                    if uuids.iter().any(|u| *u == target_uuid) {
+                        return Ok(device);
+                    }
+                }
+            }
+        }
+    }
+    Err(bluer::Error::from(Error::new(std::io::ErrorKind::NotFound, "No connected AirPods found")))
+}