[Issue #1] - Added configurable NTPServer option in config.go; also added DNS name resolution so you don't have to use IPs

config.go.example

@@ -10,5 +10,6 @@ const (
   EnableICMP = true
 
   // Time settings
+  NTPServer = "pool.ntp.org"
 	ActiveTimezone = "UTC"
 )

main.go

@@ -109,16 +109,27 @@ func main() {
   // Extract IP string from the returned NetworkStack
   ipStr := netStack.localIP.String()
 
-  // Sync wall time using public NTP (e.g. Cloudflare: 162.159.200.1 / time.cloudflare.com)
-  println("Synchronizing clock via NTP...")
-  oled.ClearBuffer()
-  tinyfont.WriteLine(oled, defaultFont, 0, 32, "Syncing NTP...", white)
-  oled.Display()
-  ntpServer := netip.MustParseAddr("162.159.200.1")
-  timeOffset, err := syncNTP(netStack, ntpServer, 5*time.Second)
-  if err != nil {
-    panicErr("NTP sync failed", err)
-  }
+  println("Resolving NTP server:", NTPServer)
+	oled.ClearBuffer()
+	tinyfont.WriteLine(oled, defaultFont, 0, 32, "Resolving NTP...", white)
+	oled.Display()
+
+  ntpServer, err := resolveHostToIP(netStack, NTPServer, 5*time.Second)
+	if err != nil {
+		panicErr("NTP DNS lookup failed", err)
+	}
+	println("NTP server IP: ", ntpServer.String())
+  time.Sleep(1 * time.Second)
+
+	println("Synchronizing clock via NTP...")
+	oled.ClearBuffer()
+	tinyfont.WriteLine(oled, defaultFont, 0, 32, "Syncing NTP...", white)
+	oled.Display()
+
+	timeOffset, err := syncNTP(netStack, ntpServer, 5*time.Second)
+	if err != nil {
+		panicErr("NTP sync failed", err)
+	}
 
   println("NTP synced successfully!")
   oled.ClearBuffer()

network.go

@@ -225,3 +225,34 @@ func tcpBackoff(consecutiveBackoffs uint) time.Duration {
   wait := min(shifted, maxWait)
   return time.Duration(wait)
 }
+
+// resolveHostToIP checks if host is already an IP literal, or queries the DNS server.
+func resolveHostToIP(stack *NetworkStack, host string, timeout time.Duration) (netip.Addr, error) {
+	// 1. If it's already an IP string (e.g. "162.159.200.1"), parse and return directly
+	if ip, err := netip.ParseAddr(host); err == nil {
+		return ip, nil
+	}
+
+	// 2. Start asynchronous DNS A-record query
+	if err := stack.stack.StartLookupIP(host); err != nil {
+		return netip.Addr{}, fmt.Errorf("start DNS lookup: %w", err)
+	}
+
+	// 3. Poll ResultLookupIP until done or timed out
+	deadline := time.Now().Add(timeout)
+	for time.Now().Before(deadline) {
+		addrs, done, err := stack.stack.ResultLookupIP(host)
+		if done {
+			if err != nil {
+				return netip.Addr{}, fmt.Errorf("DNS lookup error: %w", err)
+			}
+			if len(addrs) == 0 {
+				return netip.Addr{}, fmt.Errorf("no addresses returned for %s", host)
+			}
+			return addrs[0], nil
+		}
+		time.Sleep(50 * time.Millisecond)
+	}
+
+	return netip.Addr{}, fmt.Errorf("DNS lookup timed out for %s", host)
+}