tasks: wifi: expose cloud sensor state through a regular ping of nextcloud

src/tasks/wifi.rs

@@ -1,6 +1,7 @@
-use alloc::string::{String, ToString};
+use alloc::string::ToString;
 use embassy_sync::channel::DynamicSender;
 use embassy_sync::pubsub::DynSubscriber;
+use embassy_sync::watch::{DynReceiver, DynSender};
 use embassy_time::{Duration, Instant, Timer, WithTimeout};
 use esp_hal::rng::Rng;
 use esp_radio::wifi::{ClientConfig, ScanConfig, WifiController, WifiDevice, WifiEvent};
@@ -66,9 +67,19 @@ pub async fn wifi_connect_task(mut wifi: WifiController<'static>, motion: Dynami
     }
 }
 
+#[embassy_executor::task]
+pub async fn location_sampler(mut predictions: DynSubscriber<'static, Prediction>, tx: DynSender<'static, Prediction>) {
+    loop {
+        if let Prediction::Location(coords) = predictions.next_message_pure().await {
+            debug!("New location prediction: {coords}");
+            tx.send(Prediction::Location(coords));
+        }
+    }
+}
+
 // TODO: Wifi task needs to know when there is data to upload, so it only connects when needed.
 #[embassy_executor::task]
-pub async fn http_telemetry_task(mut predictions: DynSubscriber<'static, Prediction>, stack: Stack<'static>, motion: DynamicSender<'static, Measurement>) {
+pub async fn http_telemetry_task(mut latest_prediction: DynReceiver<'static, Prediction>, stack: Stack<'static>, motion: DynamicSender<'static, Measurement>) {
     // TODO: should wait for wifi disconnect event somehow and use that to restart sending the wifi around
 
     let seed = Rng::new().random() as i32;
@@ -91,26 +102,32 @@ pub async fn http_telemetry_task(mut predictions: DynSubscriber<'static, Predict
     let mut last_push = Instant::from_ticks(0);
 
     loop {
-        if let Prediction::Location(coords) = predictions.next_message_pure().await {
+        motion.send(Measurement::SensorHardwareStatus(SensorSource::Cloud, SensorState::Offline)).await;
-            if stack.is_config_up() {
+        stack.wait_config_up().await;
+        info!("Network is up, connecting to nextcloud...");
+        motion.send(Measurement::SensorHardwareStatus(SensorSource::Cloud, SensorState::AcquiringFix)).await;
+
+        if let Err(err) = ping_nextcloud(&mut client).await {
+            error!("Could not ping nextcloud: {err:?}");
+            continue;
+        }
+
+        motion.send(Measurement::SensorHardwareStatus(SensorSource::Cloud, SensorState::Online)).await;
+
+        if let Prediction::Location(coords) = latest_prediction.get().await {
             // Only push to HTTP if we have an ip config etc
             if last_push.elapsed().as_secs() >= 5 || gps_to_local_meters_haversine(&last_location, &coords).norm() >= 10.0 {
                 last_location = coords;
                 last_push = Instant::now();
                 if let Err(e) = Backoff::from_secs(3).attempt(async || {
-                        motion.send(Measurement::SensorHardwareStatus(SensorSource::Cloud, SensorState::AcquiringFix)).await;
                     push_location(&mut client, coords, Instant::now().as_millis()).await
                 }).await {
                     motion.send(Measurement::SensorHardwareStatus(SensorSource::Cloud, SensorState::Offline)).await;
                     warn!("Could not submit location! {e:?}");
                 } else {
                     info!("Location published");
-                        motion.send(Measurement::SensorHardwareStatus(SensorSource::Cloud, SensorState::Online)).await;
                 }
             }
-            } else {
-                motion.send(Measurement::SensorHardwareStatus(SensorSource::Cloud, SensorState::Offline)).await;
-            }
         }
     }
 }
@@ -134,3 +151,23 @@ async fn push_location(client: &mut HttpClient<'_, TcpClient<'_, 1, 4096, 4096>,
     debug!("HTTP response: {content}");
     Ok(())
 }
+
+async fn ping_nextcloud(client: &mut HttpClient<'_, TcpClient<'_, 1, 4096, 4096>, DnsSocket<'_>>) -> Result<bool, reqwless::Error> {
+    let mut buffer = [0u8; 4096];
+    let url = "https://nextcloud.malloc.hackerbots.net/nextcloud/index.php/login";
+    info!("Pinging via {url}");
+    let mut http_req = client
+        .request(
+            reqwless::request::Method::HEAD,
+            url,
+        )
+        .await?;
+    let response = http_req.send(&mut buffer).await?;
+    if !response.status.is_client_error() && !response.status.is_server_error() {
+        info!("Nextcloud is online!");
+        Ok(true)
+    } else {
+        warn!("Nextcloud ping returned error status: {:?}", response.status);
+        Ok(false)
+    }
+}