Why include <dht.h> instead of <dht/dht.h>?

[ksh1ng]

About example of dht, may I know why we include <dht.h> instead of <dht/dht.h>? Is this because of the functionality of esp_idf_lib_helpers used in esp_idf_lib_helpers?

[UncleRus]

Please read Build system section in ESP-IDF documentation.
In short: the component's CMakeLists.txt specifies the INCLUDE_DIRS parameter equal to the directory of the component itself.

[ksh1ng]

Yes, I just saw "INCLUDE_DIRS ." in idf_component_register(), but I'm curious why <dht/dht.h> causes error in the building process? Didn't we already set "EXTRA_COMPONENT_DIRS C:/Users/kshsu/Documents/ESP32/IOT_Practice/esp-idf-lib/components"?

[UncleRus]

EXTRA_COMPONENT_DIRS is not in the list of search pathes. To put it simply, -I${EXTRA_COMPONENTS_DIRS}/dht argument passed to the compiler.