add nimble mesh example

need meshctl installed on raspberrypi. nimble offical samples have a lot of pit ...

examples/nimble_mesh_light/light_model.h

@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ * Copyright (c) 2017 Intel Corporation
+ *
+ */
+
+#ifndef __BT_MESH_LIGHT_MODEL_H
+#define __BT_MESH_LIGHT_MODEL_H
+
+#include "syscfg/syscfg.h"
+#include "mesh/mesh.h"
+
+int light_model_gen_onoff_get(struct bt_mesh_model *model, u8_t *state);
+int light_model_gen_onoff_set(struct bt_mesh_model *model, u8_t state);
+int light_model_gen_level_get(struct bt_mesh_model *model, s16_t *level);
+int light_model_gen_level_set(struct bt_mesh_model *model, s16_t level);
+int light_model_light_lightness_get(struct bt_mesh_model *model, s16_t *lightness);
+int light_model_light_lightness_set(struct bt_mesh_model *model, s16_t lightness);
+int light_model_init(void);
+
+#endif