[WIFI] Wifi libs return incorrect status for is_connected() when in AP mode.

[fusspawn]

Expected Behaviour:

wlan.is_connected() to return true when a client is connected to the access point.

Actual behaviour:

wlan.is_connected() always returns false when a client is connected.

Looks like the ESP8266 implementation may have code we can reuse.
ESP32:

pycom-micropython-sigfox/esp32/mods/modwlan.c

Line 914 in d1c5ea9

STATIC mp_obj_t wlan_isconnected(mp_obj_t self_in) {

ESP8266:

pycom-micropython-sigfox/esp8266/modnetwork.c

Line 204 in 4481a1c

/// \method isconnected()

Thanks to mfalkvidd on the forums. https://forum.pycom.io/topic/4174/wlan-isconnected-in-ap-mode-still-not-working/4