NetBIOS library only works in STA mode, and not in AP mode.

[pabloandresm]

Title says it all. The problem is the same as the ESP8266NetBIOS library (esp8266/Arduino#8139).

If you look at the code, file NetBIOS.cpp, line 95, in the netbios answer, you can see:
nbnsa.addr = WiFi.localIP();

Which works only if WiFi is in STA mode, but not AP mode.

The fix would be something like this:
if (WiFi.getMode()==WIFI_STA)
nbnsa.addr = WiFi.localIP();
else
nbnsa.addr = WiFi.softAPIP();

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