室内路线规划可以根据同一个室内场所内的两个poi作为起终点，规划出一条步行路线，指引用户到达目的地。

使用示例如下：

// 构造检索参数
        // 地名规划路线
        BMFIndoorPlanNode from = BMFIndoorPlanNode( 
            floor:'F1',
            pt: BMFCoordinate(39.917381286621094, 116.37978363037109)
        ); 
        BMFIndoorPlanNode to = BMFIndoorPlanNode( 
            floor:'F6',
            pt: BMFCoordinate(39.917240142822266, 116.37954711914063)
        ); 
        BMFIndoorRoutePlanOption indoorRoutePlanOption = BMFIndoorRoutePlanOption(from: from, to: to); 
        // 检索实例
        BMFIndoorRouteSearch indoorRouteSearch = BMFIndoorRouteSearch();  
        // 检索回调
        indoorRouteSearch.onGetIndoorRouteSearchResult(callback: 
            (BMFIndoorRouteResult result, BMFSearchErrorCode errorCode) {      
              print(`室内路线检索回调 errorCode = ${errorCode}, result = ${result?.toMap()}`);  
              // 解析reslut，具体参考demo 
            });  
        // 发起检索 
        bool flag = await indoorRouteSearch.indoorRouteSearch(indoorRoutePlanOption);