Add interface availability check before starting channel hopping

listener.py

@@ -11,6 +11,7 @@ import subprocess
 import sys
 import time
 import threading
+import psutil
 
 from argparse import ArgumentParser
 from collections import defaultdict
@@ -257,6 +258,16 @@ def channel_hopper(interface, hop_interval):
 def is_deadpoint(ap_bssid):
     return sum(ap_clients[ap_bssid].values()) < 2  # No meaningful client interaction
 
+def wait_for_interface_up(iface, timeout=5):
+    print(f"[~] Waiting for interface {iface} to become available...")
+    for _ in range(timeout * 10):  # check every 0.1s for `timeout` seconds
+        if iface in psutil.net_if_stats():
+            print(f"[+] Interface {iface} is up!")
+            return True
+        time.sleep(0.1)
+    print(f"[!] Interface {iface} did not become available in {timeout} seconds.")
+    return False
+
 # === Main ===
 def main():
     parser = ArgumentParser()
@@ -272,6 +283,8 @@ def main():
     args = parser.parse_args()
 
     reset_interface(args.monitor_iface)
+    if not wait_for_interface_up(args.monitor_iface):
+        sys.exit(1)
 
     print(f"[+] Starting passive observer.")
     print(f"    Main interface: {args.main_iface}")
@@ -326,6 +339,8 @@ def main():
         print(f"    {bssid} → {vendor}")
 
     reset_interface(args.monitor_iface)
+    if not wait_for_interface_up(args.monitor_iface):
+        sys.exit(1)
 
 def get_mac_vendor(mac):
     prefix = mac.upper()[0:8].replace(":", "-")