Can't discover any device

[richardschneider]

Can't discover any device

[a13u]

I tried a further test: I added my phone to the network where I can discover the printer but not the published service...
I also tried to turn off my firewalls as well my anti-virus app without any success...

[richardschneider]

@a13u Sorry that things are not working out. Can you tell me what OS your are using?

[a13u]

no problem ;)
I just want to find out what is happening....
I am using Windows 10

[a13u]

In my Windows Printers and Device-Manager I can see the printer - I guess it discovers it with noconfnetwork

[richardschneider]

I've tidied up your code, so that console output is readable. Also, see the spike that I wrote to test things out.

        public static void Main(string[] args)
        {
            var service = new ServiceProfile("x", "_sdtest-2._tcp", 1024);
            var mdns = new MulticastService();
            var sd = new ServiceDiscovery(mdns);

            mdns.NetworkInterfaceDiscovered += (s, e) =>
            {
                foreach (var nic in e.NetworkInterfaces)
                {
                    Console.WriteLine($"discovered NIC '{nic.Name}'");
                }
                sd.QueryAllServices();
            };

            sd.ServiceDiscovered += (s, serviceName) =>
            {
                Console.WriteLine("found " + serviceName);
            };
            try
            {
                sd.Advertise(service);
                mdns.Start();
                Console.ReadKey();
            }
            finally
            {
                sd.Dispose();
                mdns.Stop();
            }
        }

[richardschneider]

Can you show me the output from the above code or from running the spike.

[a13u]

I get nothing....
The spike project returns the following

Multicast DNS spike
IP address fe80::a4bf:df55:XXXXX
IP address 10.0.0.9
21.07.2018 16:45:25 [DEBUG] Makaretu.Dns.MulticastService - Found nic 'WLAN'.
discovered NIC 'WLAN'
got a query for _homekit._tcp.local PTR, _sleep-proxy._udp.local PTR
21.07.2018 16:46:09 [DEBUG] Makaretu.Dns.ServiceDiscovery - got query for _homekit._tcp.local PTR
got a query for _homekit._tcp.local PTR, _sleep-proxy._udp.local PTR
21.07.2018 16:46:10 [DEBUG] Makaretu.Dns.ServiceDiscovery - got query for _homekit._tcp.local PTR
got a query for _homekit._tcp.local PTR, _sleep-proxy._udp.local PTR
21.07.2018 16:46:13 [DEBUG] Makaretu.Dns.ServiceDiscovery - got query for _homekit._tcp.local PTR
got a query for _homekit._tcp.local PTR, _sleep-proxy._udp.local PTR
21.07.2018 16:46:22 [DEBUG] Makaretu.Dns.ServiceDiscovery - got query for _homekit._tcp.local PTR
got a query for _http._tcp.local PTR
21.07.2018 16:46:23 [DEBUG] Makaretu.Dns.ServiceDiscovery - got query for _http._tcp.local PTR
got a query for _http._tcp.local PTR
21.07.2018 16:46:24 [DEBUG] Makaretu.Dns.ServiceDiscovery - got query for _http._tcp.local PTR
got a query for _http._tcp.local PTR
21.07.2018 16:46:27 [DEBUG] Makaretu.Dns.ServiceDiscovery - got query for _http._tcp.local PTR

[richardschneider]

Please note that the above is only discovering services available on the local network NOT the devices.

Make this change to ask for all devices (service instances) of a service

sd.ServiceDiscovered += (s, serviceName) =>
 {
       Console.WriteLine("found " + serviceName);
      mdns.SendQuery(serviceName, type: DnsType.PTR);
 };

[richardschneider]

I have not yet written a generic ServiceInstanceDiscovery (device discovery) method yet. The above code will ask for all devices with the services names and you can see the answer in the debug logs.

However to process the information you need to drop down to mdns.AnswerReceived

[richardschneider]

I'll add some device discovery into the spike. However its 03:00 my time and I'm goinf to bed. Talk to later and BTW thanks for the interest in the project.

[a13u]

I added sd.QueryAllServices(); to "mdns.NetworkInterfaceDiscovered += (s, e) =>.." in Spike
Now I find at least my local services ;)

[a13u]

Thank you for your support

[a13u]

I found out that my discovery app on my mobile phone was just looking for services on port 80....
Further, I guess that my printer is not working correctly...
For me, it seems like that "QueryAllServices()" has to be called continously in order to avoid missing a new service?

I am not sure, if this is the intended space for discussions - please, correct me if not:
After a service is discovered, the following code is called:

            sd.ServiceDiscovered += (s, serviceName) =>
            {
                Console.WriteLine("found " + serviceName);
                mdns.SendQuery(serviceName, type: DnsType.PTR);
            };

How can I find the host of this service? s is of type Makaretu.Dns.ServiceDiscovery --> I do not no know how to get a [DNS-Name/IP]->Service-Name Mapping

If I ping my Host-name I do not get a repsons --> I only see that a request is received - has this to be implemented by the user of the library?

Thank you for your awesome implementation and effort!

[richardschneider]

QueryAllServices does not need to be called continuously because new services will advertise themselves.

To get the service instance host name. You need to send a query for its SRV record then query for A/AAAA records.

[richardschneider]

An example browser is now at https://github.com/richardschneider/net-mdns/blob/master/Browser/Program.cs

Hope it helps.