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diff --git a/build/resources/main/VehicleRemoteHvac.proto b/build/resources/main/VehicleRemoteHvac.proto
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+syntax = "proto3"; /**
+*    <h2>Cabin Preconditioning</h2>
+*    <p>This set of messages define how to acquire vehicle location, either on demand or by interval and events.</p>
+*
+*    <h3>Message Orchestration</h3>
+*    <p>[TO-DO]</p>
+*
+*    <h3>MQTT Topic Design</h3>
+*    <table>
+*    <thead>
+*    <tr>
+*    <th>Direction</th>
+*    <th>Subscribe Topic</th>
+*    <th>Publish Topic</th>
+*    </tr>
+*    </thead>
+*    <tbody>
+*    <tr>
+*    <td>Vehicle to Cloud</td>
+*    <td>cabin/#</td>
+*    <td>cabin/&lt;device_id&gt;</td>
+*    </tr>
+*    <tr>
+* <td>Cloud to Vehicle</td>
+*    <td>&lt;device_id&gt;/cabin</td>
+*    <td>&lt;device_id&gt;/cabin</td>
+*    </tr>
+*    </tbody>
+*    </table>
+*/
+import "google/protobuf/timestamp.proto";
+package messages;
+message CabinConditionStatusPublish {
+
+  google.protobuf.Timestamp event_time = 1; // Time of the event
+  HVACState hvac_state = 2; // Current state of the HVAC
+  CabinTemperature cabin_temperature = 3; // Current cabin temperature
+}
+
+message PreconditionRequest {
+
+  repeated HVACZone hvac_zones = 1; // List of HVAC zones to precondition
+  // For scheduled preconditioning, set the start_time to the desired future time.
+  // For on-demand preconditioning, leave the start_time unset.
+  google.protobuf.Timestamp start_time = 2;
+}
+
+message PreconditionResponse {
+  enum Status {
+    SUCCESS = 0;
+    FAILURE = 1;
+    PENDING = 2;
+  }
+
+  Status status = 1; // Status of the precondition request
+  string message = 2; // Optional message
+}
+
+message CabinTemperature {
+  Temperature temperature = 1; // Current cabin temperature
+  HVACZone zone = 2; // Zone of the reported temperature
+}
+
+
+message Temperature {
+  float value = 1; // Temperature value
+  string unit = 2; // Temperature unit (e.g., "Celsius", "Fahrenheit")
+}
+
+message HVACZone {
+  enum Zone {
+    DRIVER = 0;
+    PASSENGER = 1;
+    REAR_LEFT = 2;
+    REAR_RIGHT = 3;
+  }
+  
+  Zone zone = 1; // HVAC Zone 
+  Temperature target_temperature = 2; // Target temperature
+}
+
+
+message HVACState {
+  enum State {
+    OFF = 0;
+    HEATING = 1;
+    COOLING = 2;
+    IDLE = 3;
+  }
+  
+  State state = 1; // Current state of the HVAC
+  HVACZone current_zone = 2; // Current active zone
+}
+
+
+