Modifications to build cleanly for ESP32 using the ESP IDF component …

…style structure (#536)

* Install directives are unhandled for esp idf build

* Properly link the idf driver component

* Fix indentation that was causing build errors

CMakeLists.txt

@@ -77,6 +77,10 @@ if(BUILD_TESTING)
   add_subdirectory("test")
 endif()
 
+if(ESP_PLATFORM)
+  return()
+endif()
+
 install(
   TARGETS Isobus Utility HardwareIntegration
   EXPORT isobusTargets

hardware_integration/CMakeLists.txt

@@ -122,6 +122,9 @@ target_compile_features(HardwareIntegration PUBLIC cxx_std_11)
 set_target_properties(HardwareIntegration PROPERTIES CXX_EXTENSIONS OFF)
 target_link_libraries(HardwareIntegration PRIVATE ${PROJECT_NAME}::Utility
                                                   ${PROJECT_NAME}::Isobus)
+if(ESP_PLATFORM)
+  target_link_libraries(HardwareIntegration PRIVATE idf::driver)
+endif()
 
 if("WindowsPCANBasic" IN_LIST CAN_DRIVER)
   if(MSVC)