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By esp8266_abc
#85430 ESP8266 AP with a hidden SSID is very hard, nearly hardly, to be connected by other STAs.

We tried many SDKs including lastest 3.x, found that, if we set the esp8266 into ap or sta+ap mode with an hidden SSID, other STA is very hard to connect the AP suucessfully, often give response "+CWJAP:3" for an example if using another esp8266 module to connect it. Very occationally it would succeed.

If we enable the wifi event callback by wifi_set_event_handler_cb() in th ap module and check the
switch (evt->event)
case EVENT_SOFTAPMODE_PROBEREQRECVED
Once the other stas is trying to connect the AP, there is expected log-print under the event.


What might be the cause, and how to locate and fix?

Thanks!