Add debugging statements

proton_arp/src/arp.rs

@@ -50,7 +50,7 @@ impl ArpManager {
     /// None.
     /// 
     /// # Returns
-    /// None.
+    /// A `ProtonResult<()>` indicating the status of the result.
     pub async fn scan(&mut self) -> ProtonResult<()> {
         let mut addresses = Vec::new();
 
@@ -90,6 +90,7 @@ impl ArpManager {
     /// An `Option<Ipv4Addr>` containing to the provided MAC address, if available.
     pub fn lookup_mac(&self, mac: MacAddr) -> Option<Ipv4Addr> {
         for entry in self.cache() {
+            println!("{} == {} ?", entry.mac, mac);
             if entry.mac == mac {
                 return Some (entry.ipv4);
             }