Sorry if this question is trivial but I couldn't find an answer.
From RMT documentation (https://docs.espressif.com/projects/esp ... ls/rmt.htm)
What is the function to handle default ISR?When calling rmt_driver_install() to use the system RMT driver, a default ISR is being installed. In such a case you cannot register a generic ISR handler with rmt_isr_register().