I’m a newbie to this forum. Please forgive if I have not submitted this properly.

Is there a list of changes and potential problems introduced with the 3.0.0 upgrade? Code I borrowed from Rui Santos’s book using ESP_NOW will no longer compile.

This line:
esp_now_register_recv_cb(OnDataRecv);

causes this error:
Compilation error: invalid conversion from ‘void (*)(const uint8_t*, const uint8_t*, int)’ {aka ‘void (*)(const unsigned char*, const unsigned char*, int)’} to ‘esp_now_recv_cb_t’ {aka ‘void (*)(const esp_now_recv_info*, const unsigned char*, int)’} [-fpermissive]

I found the definition of esp_now_recv_info in esp_now.h:
typedef struct esp_now_recv_info {
uint8_t * src_addr; /**< Source address of ESPNOW packet */
uint8_t * des_addr; /**< Destination address of ESPNOW packet */
wifi_pkt_rx_ctrl_t * rx_ctrl; /**< Rx control info of ESPNOW packet */
} esp_now_recv_info_t;

I can figure out the src_addr and the des_addr, but I don't know what the Rx control info of ESPNOW packet is.