transport: Add CONFI_WS_TRANSPORT for optimize the code size

components/esp_websocket_client/CMakeLists.txt

@@ -1,3 +1,11 @@
+if(NOT CONFIG_WS_TRANSPORT AND NOT CMAKE_BUILD_EARLY_EXPANSION)
+    message(STATUS "Websocket transport is disabled so the esp_websocket_client component will not be built")
+    # note: the component is still included in the build so it can become visible again in config
+    # without needing to re-run CMake. However no source or header files are built.
+    idf_component_register()
+    return()
+endif()
+
 idf_component_register(SRCS "esp_websocket_client.c"
                     INCLUDE_DIRS "include"
                     REQUIRES lwip esp-tls tcp_transport nghttp

components/esp_websocket_client/component.mk

@@ -0,0 +1,4 @@
+ifdef CONFIG_WS_TRANSPORT
+COMPONENT_SRCDIRS := .
+COMPONENT_ADD_INCLUDEDIRS := include
+endif

components/mqtt/Kconfig

@@ -15,6 +15,7 @@ menu "ESP-MQTT Configurations"
     config MQTT_TRANSPORT_WEBSOCKET
         bool "Enable MQTT over Websocket"
         default y
+        depends on WS_TRANSPORT
         help
             Enable MQTT transport over Websocket.
 

components/tcp_transport/CMakeLists.txt

@@ -1,8 +1,15 @@
-idf_component_register(SRCS "transport.c"
-                            "transport_ssl.c"
-                            "transport_tcp.c"
-                            "transport_ws.c"
-                            "transport_utils.c"
+set(srcs
+    "transport.c"
+    "transport_ssl.c"
+    "transport_tcp.c"
+    "transport_utils.c")
+
+if(CONFIG_WS_TRANSPORT)
+list(APPEND srcs
+    "transport_ws.c")
+endif()
+
+idf_component_register(SRCS "${srcs}"
                     INCLUDE_DIRS "include"
                     PRIV_INCLUDE_DIRS "private_include"
                     REQUIRES lwip esp-tls)

components/tcp_transport/Kconfig

@@ -1,9 +1,18 @@
 menu "TCP Transport"
 
-    config WS_BUFFER_SIZE
-        int "Websocket transport buffer size"
-        default 1024
-        help
-            Size of the buffer used for constructing the HTTP Upgrade request during connect
+    menu "Websocket"
+        config WS_TRANSPORT
+            bool "Enable Websocket Transport"
+            default y
+            help
+                Enable support for creating websocket transport.
+
+        config WS_BUFFER_SIZE
+            int "Websocket transport buffer size"
+            default 1024
+            depends on WS_TRANSPORT
+            help
+                Size of the buffer used for constructing the HTTP Upgrade request during connect
+    endmenu
 
 endmenu

components/tcp_transport/component.mk

@@ -1,2 +1,6 @@
 COMPONENT_ADD_INCLUDEDIRS := include
 COMPONENT_PRIV_INCLUDEDIRS := private_include
+
+ifndef CONFIG_WS_TRANSPORT
+	COMPONENT_OBJEXCLUDE := transport_ws.o
+endif

components/tcp_transport/transport_utils.c

@@ -1,3 +1,17 @@
+// Copyright 2015-2021 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed 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.
+
 #include <string.h>
 #include <ctype.h>
 #include <stdlib.h>

components/tcp_transport/transport_ws.c

@@ -1,3 +1,17 @@
+// Copyright 2015-2021 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed 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.
+
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>