message: IModel.toJSON must output all of its public properties. The other end of the gateway will read them adn construct an IModel(Connection) from them. toJSON was missing the 'iModelToken' property.
diff: @@ -51,6 +51,7 @@ export abstract class IModel implements IModelProps {
  out.projectExtents = this.projectExtents;
  out.globalOrigin = this.globalOrigin;
  out.ecefTrans = this.ecefTrans;
  + out.iModelToken = this.iModelToken;
  return out;
  }
  