Add clarification note on ClientsOnAP exceeding ClientsOnChannel

listener.py

@@ -1,4 +1,8 @@
 #!/usr/bin/env python3
+
+# Note: ClientsOnAP may exceed ClientsOnChannel due to silent/low-activity clients
+# receiving traffic from AP but not sending enough to cross channel activity threshold.
+
 import csv
 import os
 import re
@@ -329,10 +333,12 @@ def get_mac_vendor(mac):
             urllib.request.urlretrieve(url, "oui.txt")
         with open("oui.txt", "r", encoding="utf-8", errors="ignore") as f:
             for line in f:
-                if prefix in line:
-                    vendor = line.strip().split("\t")[-1]
-                    vendor_cache[prefix] = vendor
-                    return vendor
+                if line.strip().endswith("(hex)"):
+                    parts = line.split()
+                    if len(parts) >= 3 and parts[0] == prefix:
+                        vendor = " ".join(parts[2:]).replace("(hex)", "").strip()
+                        vendor_cache[prefix] = vendor
+                        return vendor
     except Exception as e:
         pass
     vendor_cache[prefix] = "Unknown"