diff --git a/usb_application/gsmtap.py b/usb_application/gsmtap.py
old mode 100644
new mode 100755
index 32977a4..96038ea
--- a/usb_application/gsmtap.py
+++ b/usb_application/gsmtap.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 
-from scapy.all import IP, UDP, sr1
+import socket
+import array
 
 ip="127.0.0.1"
 port=4729
@@ -10,19 +11,14 @@
 # FIXME: Is ATR something special?
 
 def gsmtap_send_apdu(data):
-# Do we have performance penalty because the socket stays open?
-    p=IP(dst=ip, src=ip)/UDP(sport=sp, dport=port)/(gsmtap_hdr+data)
-# FIXME: remove show and ans
-    if p:
-        p.show()
-
-    ans = sr1(p, timeout=2)
-    if ans:
-        print(ans)
+    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    s.connect((ip, port))
+    s.send(gsmtap_hdr+data.tostring())
+    s.close()
 
 if __name__ == '__main__':
     cmds = ("\xa0\xa4\x00\x00\x02\x6f\x7e\x9f\x0f",
             "\xa0\xd6\x00\x00\x0b\xff\xff\xff\xff\x09\xf1\x07\xff\xfe\x00\x03\x90\x00",
-            );
+            )
     for cmd in cmds:
-        gsmtap_send_apdu(cmd)
+        gsmtap_send_apdu(array.array('B', cmd))