add:pm.dtimerCheck 添加剩余时间

luat/modules/luat_lib_pm.c

@@ -128,26 +128,31 @@ static int l_pm_dtimer_stop(lua_State *L) {
     return 0;
 }
 
+LUAT_WEAK uint32_t luat_pm_dtimer_remain(int id){
+	return -1;
+}
+
 /**
 检查底层定时器是不是在运行
 @api pm.dtimerCheck(id)
 @int 定时器id
 @return boolean 处理结果,true还在运行，false不在运行
+@return number 如果运行,运行剩余时间,单位毫秒
 @usage
 -- 检查底层定时器是不是在运行
 pm.dtimerCheck(0) -- 检查id=0的底层定时器
  */
 static int l_pm_dtimer_check(lua_State *L) {
     int dtimer_id = luaL_checkinteger(L, 1);
-    if (luat_pm_dtimer_check(dtimer_id))
-    {
+    if (luat_pm_dtimer_check(dtimer_id)){
+        uint32_t remain = luat_pm_dtimer_remain(dtimer_id)
     	lua_pushboolean(L, 1);
-    }
-    else
-    {
+        lua_pushinteger(L, remain);
+        return 2;
+    }else
     	lua_pushboolean(L, 0);
-    }
-    return 1;
+        return 1;
+
 }
 
 static int l_pm_dtimer_list(lua_State *L) {