diff --git a/src/lib.rs b/src/lib.rs
index 760260a..e58c8e2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -15,10 +15,14 @@ use webrtc::peer_connection::sdp::session_description::RTCSessionDescription;
 use webrtc::ice_transport::ice_candidate::{RTCIceCandidate, RTCIceCandidateInit};
 
 mod boxes;
+mod tracking_events;
+
 use boxes::NormalizedBoxCoords;
+use tracking_events::TrackingUpdate;
 
 pub mod types {
     pub use crate::boxes::NormalizedBoxCoords;
+    pub use crate::tracking_events::TrackingUpdate;
 }
 
 static MAX_MESSAGE: usize = 50;
@@ -32,7 +36,7 @@ pub enum ApplicationMessage {
     NameRequest(Option<String>),
 
     ChangeTrackingID(u16),
-    TrackingBoxes(Vec<NormalizedBoxCoords>),
+    TrackingBoxes(TrackingUpdate),
     ManualMovementOverride((i32, i32)),
 
     WebRTCPacket(RTCSessionDescription),
diff --git a/src/tracking_events.rs b/src/tracking_events.rs
new file mode 100644
index 0000000..cb70f07
--- /dev/null
+++ b/src/tracking_events.rs
@@ -0,0 +1,10 @@
+use serde::{Serialize, Deserialize};
+
+use crate::NormalizedBoxCoords;
+
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct TrackingUpdate {
+    target_id: Option<u16>,
+    boxes: Vec<NormalizedBoxCoords>
+}