ESP32: Enable shell command for external platform feature

config/esp32/components/chip/CMakeLists.txt

@@ -174,6 +174,9 @@ endif()
 
 if (CONFIG_CHIP_ENABLE_EXTERNAL_PLATFORM)
     chip_gn_arg_append("chip_device_platform"   "\"external\"")
+    if (CONFIG_ENABLE_CHIP_SHELL)
+        chip_gn_arg_append("chip_shell_platform"    "\"esp32\"")
+    endif()
     chip_gn_arg_append("chip_platform_target"   "\"//${CONFIG_CHIP_EXTERNAL_PLATFORM_DIR}\"")
 endif()
 

src/lib/shell/BUILD.gn

@@ -15,6 +15,7 @@
 import("//build_overrides/chip.gni")
 
 import("${chip_root}/src/lib/core/core.gni")
+import("${chip_root}/src/lib/shell/shell_device.gni")
 import("${chip_root}/src/platform/device.gni")
 
 source_set("shell_core") {
@@ -43,7 +44,8 @@ static_library("shell") {
     sources += [ "streamer_stdio.cpp" ]
   }
 
-  if (chip_device_platform == "esp32") {
+  if (chip_device_platform == "esp32" ||
+      (chip_device_platform == "external" && chip_shell_platform == "esp32")) {
     sources += [
       "MainLoopESP32.cpp",
       "streamer_esp32.cpp",

src/lib/shell/shell_device.gni

@@ -0,0 +1,18 @@
+# Copyright (c) 2020 Project CHIP Authors
+#
+# 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.
+
+declare_args() {
+  # Enable shell support
+  chip_shell_platform = ""
+}