fixed webserver not working

- shared store in main
- multiple tasks for webserver

src/webserver/sse.rs

@@ -0,0 +1,29 @@
+use embassy_time::{Duration, Timer};
+use log::warn;
+use picoserve::response;
+
+pub struct Events(pub TallySubscriber);
+
+impl response::sse::EventSource for Events {
+    async fn write_events<W: picoserve::io::Write>(
+        mut self,
+        mut writer: response::sse::EventWriter<W>,
+    ) -> Result<(), W::Error> {
+        loop {
+            let timeout = Timer::after(Duration::from_secs(15));
+            let sel = embassy_futures::select::select(self.0.next_message(), timeout);
+
+            match sel.await {
+                embassy_futures::select::Either::First(msg) => match msg {
+                    embassy_sync::pubsub::WaitResult::Message(id) => {
+                        writer.write_event("msg", id.to_string().as_str()).await?
+                    }
+                    embassy_sync::pubsub::WaitResult::Lagged(_) => {
+                        warn!("SSE subscriber got lagged");
+                    }
+                },
+                embassy_futures::select::Either::Second(_) => writer.write_keepalive().await?,
+            }
+        }
+    }
+}