mesh: add chain topology

components/esp_wifi/include/esp_mesh.h

@@ -252,6 +252,14 @@ typedef enum {
     MESH_REASON_PARENT_UNENCRYPTED,         /**< connect to an unencrypted parent/router */
 } mesh_disconnect_reason_t;
 
+/**
+ * @brief Mesh topology
+ */
+typedef enum {
+    MESH_TOPO_TREE,                         /**< tree topology */
+    MESH_TOPO_CHAIN,                        /**< chain topology */
+} esp_mesh_topology_t;
+
 /*******************************************************
  *                Structures
  *******************************************************/
@@ -1454,6 +1462,28 @@ esp_err_t esp_mesh_get_router_bssid(uint8_t *router_bssid);
  */
 int64_t esp_mesh_get_tsf_time(void);
 
+/**
+ * @brief      Set mesh topology. The default value is MESH_TOPO_TREE
+ *             - MESH_TOPO_CHAIN supports up to 1000 layers
+ *
+ * @attention  This API shall be called before mesh is started
+ *
+ * @param[in]  topo  MESH_TOPO_TREE or MESH_TOPO_CHAIN
+ *
+ * @return
+ *    - ESP_OK
+ *    - ESP_MESH_ERR_ARGUMENT
+ *    - ESP_ERR_MESH_NOT_ALLOWED
+ */
+esp_err_t esp_mesh_set_topology(esp_mesh_topology_t topo);
+
+/**
+ * @brief      Get mesh topology
+ *
+ * @return     MESH_TOPO_TREE or MESH_TOPO_CHAIN
+ */
+esp_mesh_topology_t esp_mesh_get_topology(void);
+
 #ifdef __cplusplus
 }
 #endif

components/esp_wifi/lib

@@ -1 +1 @@
-Subproject commit 0dd62e0f12d3c78f8274ffd0f42f90c39a9bbb7c
+Subproject commit 662585ad48bbcad01b757fab63ba9adbb0020f57

examples/mesh/internal_communication/main/Kconfig.projbuild

@@ -1,5 +1,32 @@
 menu "Example Configuration"
 
+    choice
+        bool "Mesh Topology"
+        default MESH_TOPO_TREE
+        help
+            Mesh Network Topology.
+
+        config MESH_TOPO_TREE
+            bool "MESH_TOPO_TREE"
+        config MESH_TOPO_CHAIN
+            bool "MESH_TOPO_CHAIN"
+    endchoice
+
+    config MESH_TOPOLOGY
+        int
+        default 0 if MESH_TOPO_TREE
+        default 1 if MESH_TOPO_CHAIN
+        help
+            Mesh Network Topology.
+
+    config MESH_MAX_LAYER
+        int "Mesh Max Layer"
+        range 1 25 if MESH_TOPO_TREE
+        range 1 1000 if MESH_TOPO_CHAIN
+        default 6
+        help
+            Max layer allowed in mesh network.
+
     config MESH_CHANNEL
         int "channel"
         range 0 14
@@ -57,13 +84,6 @@ menu "Example Configuration"
         help
             The number of stations allowed to connect in.
 
-    config MESH_MAX_LAYER
-        int "Mesh Max Layer"
-        range 1 25
-        default 6
-        help
-            Max layer allowed in mesh network.
-
     config MESH_ROUTE_TABLE_SIZE
         int "Mesh Routing Table Size"
         range 1 300

examples/mesh/internal_communication/main/mesh_main.c

@@ -212,16 +212,16 @@ void mesh_event_handler(void *arg, esp_event_base_t event_base,
     break;
     case MESH_EVENT_ROUTING_TABLE_ADD: {
         mesh_event_routing_table_change_t *routing_table = (mesh_event_routing_table_change_t *)event_data;
-        ESP_LOGW(MESH_TAG, "<MESH_EVENT_ROUTING_TABLE_ADD>add %d, new:%d",
+        ESP_LOGW(MESH_TAG, "<MESH_EVENT_ROUTING_TABLE_ADD>add %d, new:%d, layer:%d",
                  routing_table->rt_size_change,
-                 routing_table->rt_size_new);
+                 routing_table->rt_size_new, mesh_layer);
     }
     break;
     case MESH_EVENT_ROUTING_TABLE_REMOVE: {
         mesh_event_routing_table_change_t *routing_table = (mesh_event_routing_table_change_t *)event_data;
-        ESP_LOGW(MESH_TAG, "<MESH_EVENT_ROUTING_TABLE_REMOVE>remove %d, new:%d",
+        ESP_LOGW(MESH_TAG, "<MESH_EVENT_ROUTING_TABLE_REMOVE>remove %d, new:%d, layer:%d",
                  routing_table->rt_size_change,
-                 routing_table->rt_size_new);
+                 routing_table->rt_size_new, mesh_layer);
     }
     break;
     case MESH_EVENT_NO_PARENT_FOUND: {
@@ -391,6 +391,9 @@ void app_main(void)
     /*  mesh initialization */
     ESP_ERROR_CHECK(esp_mesh_init());
     ESP_ERROR_CHECK(esp_event_handler_register(MESH_EVENT, ESP_EVENT_ANY_ID, &mesh_event_handler, NULL));
+    /*  set mesh topology */
+    ESP_ERROR_CHECK(esp_mesh_set_topology(CONFIG_MESH_TOPOLOGY));
+    /*  set mesh max layer according to the topology */
     ESP_ERROR_CHECK(esp_mesh_set_max_layer(CONFIG_MESH_MAX_LAYER));
     ESP_ERROR_CHECK(esp_mesh_set_vote_percentage(1));
     ESP_ERROR_CHECK(esp_mesh_set_ap_assoc_expire(10));
@@ -411,6 +414,7 @@ void app_main(void)
     ESP_ERROR_CHECK(esp_mesh_set_config(&cfg));
     /* mesh start */
     ESP_ERROR_CHECK(esp_mesh_start());
-    ESP_LOGI(MESH_TAG, "mesh starts successfully, heap:%d, %s\n",  esp_get_free_heap_size(),
-             esp_mesh_is_root_fixed() ? "root fixed" : "root not fixed");
+    ESP_LOGI(MESH_TAG, "mesh starts successfully, heap:%d, %s<%d>%s\n",  esp_get_free_heap_size(),
+             esp_mesh_is_root_fixed() ? "root fixed" : "root not fixed",
+             esp_mesh_get_topology(), esp_mesh_get_topology() ? "(chain)":"(tree)");
 }