Question: is mDNS supposed to work in AP mode ?

[luc-github]

Hi I have tried mDNS sample in Station Mode, and it works very well - excellent!
But I have issue in AP mode:
I have modified the sample code to start in AP mode without password

  // Connect to WiFi network
  //WiFi.begin(ssid, password);
  WiFi.mode(WIFI_AP);
  WiFi.softAP(ssid);

and started mDNS using AP IP
if (!mdns.begin("esp8266", WiFi.softAPIP())) {

webserver answer as expected on browser if using ip address (normal), but no answer when using http://esp8266.local - seems mDNS started without issue and I do not see any error on serial.

Is that normal ? or do I miss to setup something ?

Thanks,

Luc

[igrr]

I have tried this and it seems that multicast doesn't work over softAP interface.
For multicast destinations udp_send returns error code 1, which is not one of lwIP error codes (which are all negative), so it must be coming from the lower level (netif->output).
This looks like an issue with Espressif's softAP interface.

[luc-github]

Ok thanks a lot for your answer
so I close the issue or you want to keep a tracker ?

[luc-github]

Verified fixed - sorry for the delay thanks again for your great work

[gregslomin]

I cannot seem to make this work. Using the current staging board manager build .begin("esp8266", WiFi.softAPIP()) and .begin("esp8266") both return false.

[luc-github]

I have same issue - seems something is broken since last test
No answer on STA neither AP on OSX/Windows/Android

[luc-github]

Seems using a String and c_str() is not working well and even can lead to exception 28
like:

String shost = "esp8266";
.....
if (!mdns.begin(shost.c_str())) ...

but using an array of char is ok, like :

char hostname [12+1];
...
strcpy (hostname,"ESP_008261");
...
if (!mdns.begin(hostname)) ...

now both AP and STA are answering

[gregslomin]

Is this an issue with the String class or an issue with const char pointers? Does the ESP8266 attempt to append a .local on the end of the given hostname and reuse the same memory?

[luc-github]

looking at the mDNS code, the content is copied so should not have issue

// Copy in domain characters as lowercase
  for (int i = 0; i < n; ++i)
    _hostName[i] = tolower(domain[i]);
  _hostName[n] = '\0';