[esp_hosted] Which version of espressif/esp_hosted is compatible with Zephyr esp_hosted driver?

[Lwao]

Greetings Zephyr community,

I am having some troubles making esp_hosted work in a Zephyr sample. But first, I would like to confirm what version of the co-processor firmware from espressif/esp_hosted is compatible with the current Zephyr esp_hosted driver of Zephyr 4.4.0. Could someone help me with this information, please?

For instance, this structure on esp-hosted-mcu for the co-processor (https://github.com/espressif/esp-hosted-mcu/blob/main/common/esp_hosted_interface.h#L14-L24):

typedef enum {
	ESP_INVALID_IF,
	ESP_STA_IF,
	ESP_AP_IF,
	ESP_SERIAL_IF,
	ESP_HCI_IF,
	ESP_PRIV_IF,
	ESP_TEST_IF,
	ESP_ETH_IF,
	ESP_MAX_IF,
} esp_hosted_if_type_t;

It is a bit different from its Zephyr counterpart (https://github.com/zephyrproject-rtos/zephyr/blob/main/drivers/wifi/esp_hosted/esp_hosted_wifi.h#L30-L38):

typedef enum {
	ESP_HOSTED_STA_IF = 0,
	ESP_HOSTED_SAP_IF,
	ESP_HOSTED_SERIAL_IF,
	ESP_HOSTED_HCI_IF,
	ESP_HOSTED_PRIV_IF,
	ESP_HOSTED_TEST_IF,
	ESP_HOSTED_MAX_IF,
} esp_hosted_interface_t;

Also the payload header diverges a bit (e.g. Zephyr driver does not have the field throttle_cmd):

• esp-mcu-hosted: https://github.com/espressif/esp-hosted-mcu/blob/main/common/esp_hosted_header.h#L13-L34
• esp_hosted Zephyr: https://github.com/zephyrproject-rtos/zephyr/blob/main/drivers/wifi/esp_hosted/esp_hosted_wifi.h#L87-L119

I wonder if these discrepancies could be enough to cause any incompatibility between Zephyr host and the co-processor.
I am still studying in depth the driver and the co-processor firmware, but knowing beforehand if the Zephyr driver was developed aiming at a specific esp-mcu-hosted version would be very helpful.

Thanks in advance for all the support!

[Lwao]

The driver is compatible with ESP-Hosted-FG (#87685), mainly because Arduino Portenta C33 will ship with this firmware. Further updates were merged at #103154 to support ESP-Hosted-FG v1.0.0.0.0.