A simple mDNS client for device discovery on your local network.
1. git clone https://github.com/NationalAssociationOfRealtors/mdns.git
2. mix do deps.get, deps.compile
3. iex -S mix
To discover a device in a namespace call Mdns.Client.query(namespace \\ "_services._dns-sd._udp.local"). Compliant devices will respond with a DNS response. Mdns.Client will notify the event bus, available at Mdns.Client.Events, of any devices it finds.
Calling Mdns.Client.query("_googlecast._tcp.local")
assuming you have a Chromecast on your network, an event is broadcasted on Mdns.Client.Events that looks like this
{:"_googlecast._tcp.local",
%Mdns.Client.Device{
domain: "CRT-Labs.local",
ip: {192, 168, 1, 138},
payload: %{
"bs" => "FA8FCA79C426",
"ca" => "4101",
"fn" => "CRT-Labs",
"ic" => "/setup/icon.png",
"id" => "e0617de7e2df63476fab257c8327ef3b",
"md" => "Chromecast",
"rm" => "E81C9A486980AA48",
"rs" => "",
"st" => "0",
"ve" => "05"
},
services: [
"CRT-Labs._googlecast._tcp.local"
]
}
}
After calling Mdns.Client.query("_ssh._tcp.local") in addition to the Chromecast call above, Mdns.Client.devices will return a devices map similar to this. Assuming you have a device on the network that supports ssh.
%{"_googlecast._tcp.local": [
%Mdns.Client.Device{
domain: "CRT-Labs.local",
ip: {192, 168, 1, 138},
payload: %{
"bs" => "FA8FCA79C426",
"ca" => "4101",
"fn" => "CRT-Labs",
"ic" => "/setup/icon.png",
"id" => "e0617de7e2df63476fab257c8327ef3b",
"md" => "Chromecast",
"rm" => "E81C9A486980AA48",
"rs" => "",
"st" => "0",
"ve" => "05"
},
services: [
"CRT-Labs._googlecast._tcp.local"
]
}
],
"_ssh._tcp.local": [
%Mdns.Client.Device{
domain: "pc-6105006P.local",
ip: {192, 168, 1, 26},
payload: nil,
services: [
"pc-6105006P._ssh._tcp.local"
]
}
],
other: []
}