Thanks for your responses. In that case I will implement my own enums.

Hello all,

Is it possible to define custom esp_err_t types in addition to the existing esp errors?

I can see the definition of the esp error codes in some header files. It defines an error base + the unique error number as hex.
For instance in esp_ota_ops.h:

#define ESP_ERR_OTA_BASE 0x1500 ...