[TW#15818] Enhance esp_wifi_ap_get_sta_list / wifi_sta_info_t to include RSSI, protocol

[nickzoic]

When acting as an AP, there's a call (esp_wifi_ap_get_sta_list) to get the list of stations connected.
This returns a list connected stations as an array of wifi_sta_info_t, which at the moment only has the mac address.

It'd be helpful to also make available the most recent RSSI measurement and perhaps which protocol (b,g,n,lr) the station is using.

The station RSSI is also available from the esp_wifi_set_vendor_ie_cb mechanism, but matching this data up to the station list is fraught. See also: micropython/micropython-esp32#186

[liuzfesp]

@nickzoic it's in our TODO list, will support it in idf3.1

[nickzoic]

Brilliant, thank you!

[XinDeng11]

Hi@nickzoic, we have added the rssi you need in the wifi_sta_info_t, you will find it after 3.1 release, if you earge to use, you can pull down the f3df30f9 after it merged, but it may need few days to merge for review and test

[nickzoic]

That's great, we'll add it to MicroPython as soon as we can!

[nickzoic]

Brilliant, thanks Ivan!