ESP8266 Community Forum

Hi,

I'm using ArduinoOTA, and I notice that I am not able to start a mDNS service. I am thinking it is because the ArduinoOTA is also using a mDNS service ("esp8266-deviceID.local:8266").

Question here is, how can I use that mDNS service to add my own services? I like to make my Telnet server on my esp available via the easy mDNS hostname also.

Thanks!

Simply don't instantiate any mDNS service in your sketch, but still include the header file.
Then, in your setup() add "MDNS.addService("telnet", "tcp", 23);" after the ArduinoOTA.begin();

Ah, wow that easy. Didn't expect the MDNS object from ArduinoOTA to be available. And yes, that works .. sort of..
Technically it works, only somehow adding mDNS services is not actually working. The service doesn't show up in my Bonjour browser (the OTA service is shown). And connecting to it using telnet doesn't work.

I noticed that ArduinoOTA doesn't use the .addService method, but binds to MDNS in a way that I don't fully comprehend..

I should really be digging deeper into mDNS here, I feel I'm just bearly scratching the surface.. Just of the bat, any pointers anyone?

I don't know why it is not working for you, maybe it is a bug related only with Bonjour, on Linux using Avahi, the Telnet service is shown :



As you can see, the OTA, HTTPServer and Telnet are present.

BTW, even if your didn't have added the MDNS.addService() for Telnet, you should be able to connect to it since the name resolution is already done. So, maybe your TCP Telnet server code is not working, or you don't have such code at all (simply adding the service in mDNS doesn't give you the service, but only advertising it).