Lookup services with address (WIP)

src/kernel/mdns.rs

@@ -1,14 +1,39 @@
-use std::time::Duration;
+use std::{net::IpAddr, time::Duration};
 
+use anyhow::{anyhow, Result};
 use esp_idf_svc::mdns::{EspMdns, Interface, Protocol, QueryResult};
+use esp_idf_sys::ESP_ERR_NOT_FOUND;
 
 #[derive(Debug, Clone)]
 pub struct Service {
     pub hostname: String,
+    pub addr: IpAddr,
     pub port: u16,
 }
 
-pub fn query_mdns(mdns: &EspMdns, service: &str, proto: &str) -> anyhow::Result<Option<Service>> {
+pub fn query_mdns_address(mdns: &EspMdns, server: &str, port: u16) -> Result<Option<Service>> {
+    let response = mdns.query_a(server, Duration::from_secs(5));
+    log::info!("MDNS query result: {:?}", response);
+    match response {
+        Ok(addr) => {
+            let addr = IpAddr::V4(addr);
+            Ok(Some(Service {
+                hostname: server.to_string(),
+                addr,
+                port,
+            }))
+        }
+        Err(e) => {
+            if e.code() == ESP_ERR_NOT_FOUND {
+                Ok(None)
+            } else {
+                Err(anyhow!(e.to_string()))
+            }
+        }
+    }
+}
+
+pub fn query_mdns(mdns: &EspMdns, service: &str, proto: &str) -> Result<Option<Service>> {
     let mut results = [QueryResult {
         instance_name: None,
         hostname: None,
@@ -23,6 +48,7 @@ pub fn query_mdns(mdns: &EspMdns, service: &str, proto: &str) -> anyhow::Result<
     let result = results[0].clone();
     Ok(result.hostname.map(|hostname| Service {
         hostname: format!("{}.local", hostname),
+        addr: result.addr[0],
         port: result.port,
     }))
 }