feat: Add some message parsing

src/applogic/cam.rs

@@ -0,0 +1,65 @@
+//! C-ITS CAM Evaluation
+
+use c_its_parser::standards::cam_1_4_1::cam_pdu_descriptions::{self, HighFrequencyContainer};
+use log::info;
+
+pub fn handle_cam(etsi: &cam_pdu_descriptions::CAM) {
+    // only POC output
+    match &etsi.cam.cam_parameters.high_frequency_container {
+        HighFrequencyContainer::basicVehicleContainerHighFrequency(obu) => {
+            let station_id = etsi.header.station_id.0;
+            let lat_deg = etsi
+                .cam
+                .cam_parameters
+                .basic_container
+                .reference_position
+                .latitude
+                .as_deg();
+            let lon_deg = etsi
+                .cam
+                .cam_parameters
+                .basic_container
+                .reference_position
+                .longitude
+                .as_deg();
+
+            if obu.speed.speed_value.is_unavailable() {
+                info!(
+                    "Got CAM from {station_id} at {lat_deg:.3}°N, {lon_deg:.3}°E, speed unavailable",
+                );
+            } else {
+                info!(
+                    "Got CAM from {station_id} at {lat_deg:.3}°N, {lon_deg:.3}°E, speed {:.2} km/h",
+                    obu.speed.speed_value.as_kmh()
+                );
+            }
+        }
+        HighFrequencyContainer::rsuContainerHighFrequency(rsu) => {
+            info!(
+                "Got RSU from {} at {:.3}°N, {:.3}°E, {} protected zones",
+                etsi.header.station_id.0,
+                etsi.cam
+                    .cam_parameters
+                    .basic_container
+                    .reference_position
+                    .latitude
+                    .as_deg(),
+                etsi.cam
+                    .cam_parameters
+                    .basic_container
+                    .reference_position
+                    .longitude
+                    .as_deg(),
+                rsu.protected_communication_zones_rsu
+                    .as_ref()
+                    .map(|d| d.0.len())
+                    .unwrap_or_default()
+            );
+        }
+
+        _ => {
+            // enum is non-exhaustive, so we need a default case
+            // but this should never be reached in pactical applications
+        }
+    }
+}