1. new APIs: esp_mesh_get_subnet_nodes_num() and esp_mesh_get_subnet_nodes_list(). 2. fix hard to find the parent during connect. 3. disable Wi-Fi channel switch function. 4. fix a typo of MESH_EVENT_NO_PARENT_FOUND.
1. rename example internal_transceiver to internal_communication 2. bugfix 3. Closes https://github.com/espressif/esp-idf/issues/2014