feat: winrtble adapter_info and StateUpdate implementation

Author: szymonlesisz

src/winrtble/adapter.rs

@@ -23,19 +23,47 @@ use std::convert::TryInto;
 use std::fmt::{self, Debug, Formatter};
 use std::pin::Pin;
 use std::sync::{Arc, Mutex};
+use windows::{
+    Devices::Radios::{Radio, RadioState},
+    Foundation::TypedEventHandler
+};
 
 /// Implementation of [api::Central](crate::api::Central).
 #[derive(Clone)]
 pub struct Adapter {
     watcher: Arc<Mutex<BLEWatcher>>,
     manager: Arc<AdapterManager<Peripheral>>,
+    radio: Radio,
+}
+
+// https://github.com/microsoft/windows-rs/blob/master/crates/libs/windows/src/Windows/Devices/Radios/mod.rs
+fn get_central_state(radio: Radio) -> CentralState {
+    let state = radio.State().unwrap_or(RadioState::Unknown);
+    match state {
+        RadioState::On => CentralState::PoweredOn,
+        RadioState::Off => CentralState::PoweredOff,
+        _ => CentralState::Unknown,
+    }
 }
 
+
 impl Adapter {
-    pub(crate) fn new() -> Self {
+    pub(crate) fn new(radio: Radio) -> Self {
         let watcher = Arc::new(Mutex::new(BLEWatcher::new()));
         let manager = Arc::new(AdapterManager::default());
-        Adapter { watcher, manager }
+
+        let radio_clone = radio.clone();
+        let manager_clone = manager.clone();
+        let handler = TypedEventHandler::new(
+            move |_sender, _args| {
+                let state = get_central_state(radio_clone.clone());
+                manager_clone.emit(CentralEvent::StateUpdate(state.into()));
+                Ok(())
+            },
+        );
+        radio.StateChanged(&handler);
+
+        Adapter { watcher, manager, radio }
     }
 }
 
@@ -102,6 +130,6 @@ impl Central for Adapter {
     }
 
     async fn adapter_state(&self) -> Result<CentralState> {
-        Ok(CentralState::Unknown)
+        Ok(get_central_state(self.radio.clone()))
     }
 }

src/winrtble/manager.rs

@@ -35,7 +35,7 @@ impl api::Manager for Manager {
         Ok(radios
             .into_iter()
             .filter(|radio| radio.Kind() == Ok(RadioKind::Bluetooth))
-            .map(|_| Adapter::new())
+            .map(|radio| Adapter::new(radio.clone()))
             .collect())
     }
 }