wifi.radio.ap_info returns None — no RSSI for the current association

[mikeysklar]

common_hal_wifi_radio_get_ap_info() in ports/zephyr-cp/common-hal/wifi/Radio.c is a stub that returns mp_const_none; the espressif implementation below it is commented out.

Consequence: there is no way to read the RSSI, BSSID or channel of the AP you are actually associated to. The workaround is a full scan matched against the connected SSID:

import os, wifi
S = os.getenv("CIRCUITPY_WIFI_SSID")
r = [n.rssi for n in wifi.radio.start_scanning_networks() if n.ssid == S]
wifi.radio.stop_scanning_networks()
print(max(r) if r else None, "dBm")

That works (verified, -34 dBm, and it tracks geometry correctly) but costs a scan and briefly uses the radio while associated.

Owner: unassigned

[mikeysklar]

Implemented in siwx917/feat-wifi-ap-info (e69fb11dad).

common_hal_wifi_radio_get_ap_info() now reads the live association via Zephyr's NET_REQUEST_WIFI_IFACE_STATUS and translates wifi_iface_status into the wifi_scan_result that wifi.Network wraps.

Verified on hardware against the scan-based workaround this retires:

ap_info  ('foreverrun', 'b0:19:21:df:d4:03', -43, 5)
scan     ('foreverrun', 'b0:19:21:df:d4:03', -42, 5)
bssid match True | channel match True | rssi delta -1

Same BSSID and channel from two independent methods; the 1 dBm difference is the samples being a scan apart. The BSSID is also distinct from wifi.radio.mac_address (c0:9b:9e:c3:99:10), confirming it reports the AP rather than the station — which the scan workaround could not guarantee when two radios share an SSID.

Two implementation notes:

• Guarded on WIFI_STATE_ASSOCIATED, the weakest state where BSSID and RSSI are meaningful, rather than a connected flag alone.
• status.rssi is int, scan_result.rssi is int8_t. Clamped rather than truncated — a wrapped value would read as a positive dBm, the same class of bug as the driver's unsigned-magnitude RSSI fixed in siwx917/fix-scan-rssi-sign.

Depends on siwx917/feat-wifi-station-connect, since the guard needs self->connected to actually be maintained.