make use of proto well knows types

pusher/src/Model/Zone.ts

@@ -22,6 +22,7 @@ import {
 import { ClientReadableStream } from "grpc";
 import { PositionDispatcher } from "_Model/PositionDispatcher";
 import Debug from "debug";
+import { BoolValue, UInt32Value } from "google-protobuf/google/protobuf/wrappers_pb";
 
 const debug = Debug("zone");
 
@@ -125,9 +126,9 @@ export class UserDescriptor {
 export class GroupDescriptor {
     private constructor(
         public readonly groupId: number,
-        private groupSize: number,
+        private groupSize: number | undefined,
         private position: PointMessage,
-        private locked: boolean
+        private locked: boolean | undefined
     ) {}
 
     public static createFromGroupUpdateZoneMessage(message: GroupUpdateZoneMessage): GroupDescriptor {
@@ -150,9 +151,13 @@ export class GroupDescriptor {
             throw new Error("GroupDescriptor.groupId is not an integer: " + this.groupId);
         }
         groupUpdateMessage.setGroupid(this.groupId);
-        groupUpdateMessage.setGroupsize(this.groupSize);
+        if (this.groupSize !== undefined) {
+            groupUpdateMessage.setGroupsize(new UInt32Value().setValue(this.groupSize));
+        }
         groupUpdateMessage.setPosition(this.position);
-        groupUpdateMessage.setLocked(this.locked);
+        if (this.locked !== undefined) {
+            groupUpdateMessage.setLocked(new BoolValue().setValue(this.locked));
+        }
         return groupUpdateMessage;
     }
 }