diff --git a/usb_application/ccid_raw.py b/usb_application/ccid_raw.py
index 1a51b687..4447e348 100755
--- a/usb_application/ccid_raw.py
+++ b/usb_application/ccid_raw.py
@@ -5,6 +5,8 @@ import smartcard.util
 
 import array
 
+from util import HEX
+
 class SmartcardException(Exception):
     pass
 
@@ -22,7 +24,7 @@ class SmartcardConnection:
         print 'Reader:', reader
         print 'State:', state
         print 'Protocol:', protocol
-        print 'ATR:', smartcard.util.toHexString(atr, smartcard.util.HEX)
+        print 'ATR:', HEX(atr)
         return array.array('B', atr)
 
     def reset_card(self):
@@ -67,14 +69,13 @@ class SmartcardConnection:
         print 'Released context.'
 
     def send_receive_cmd(self, cmd):
-        print("Cmd: ")
+        print("Cmd to SIM: " + HEX(cmd))
         hresult, resp = SCardTransmit(self.hcard, self.dwActiveProtocol,
             cmd.tolist())
         if hresult != SCARD_S_SUCCESS:
             raise SmartcardException('Failed to transmit: ' +
                 SCardGetErrorMessage(hresult))
-        print 'Ans: ' + smartcard.util.toHexString(resp,
-            smartcard.util.HEX)
+        print 'SIM Ans: ' + HEX(resp)
         return array.array('B', resp)
 
     def disconnect_card(self):
diff --git a/usb_application/mitm.py b/usb_application/mitm.py
index 962bf88f..4a43d4e0 100755
--- a/usb_application/mitm.py
+++ b/usb_application/mitm.py
@@ -6,6 +6,7 @@ import phone
 
 from contextlib import closing
 
+from util import HEX
 
 def find_dev():
     dev = usb.core.find(idVendor=0x03eb, idProduct=0x6004)
@@ -36,14 +37,15 @@ ERR_TIMEOUT = 110
 
 def poll_ep(dev, ep):
     try:
-        return dev.read(ep, 64, 1000)
+        return dev.read(ep, 64, 100)
     except usb.core.USBError as e:
         if e.errno != ERR_TIMEOUT:
             raise
         return None
 
 def write_phone(dev, resp):
-    dev.write(PHONE_WR, resp, 1000)
+    print("WR: ", HEX(resp))
+    dev.write(PHONE_WR, resp, 100)
 
 def do_mitm():
     dev = find_dev()
@@ -52,14 +54,15 @@ def do_mitm():
         while True:
             cmd = poll_ep(dev, PHONE_INT)
             if cmd is not None:
-                print(cmd)
+                print("Int line ", HEX(cmd))
                 assert cmd[0] == ord('R')
 # FIXME: restart card anyways?
 #               sm_con.reset_card()
+                print("Write atr: ", HEX(atr))
                 write_phone(dev, atr)
 
             cmd = poll_ep(dev, PHONE_RD)
             if cmd is not None:
-                print(cmd)
+                print("RD: ", HEX(cmd))
                 sim_data = sm_con.send_receive_cmd(cmd)
                 write_phone(dev, sim_data)
diff --git a/usb_application/util.py b/usb_application/util.py
new file mode 100644
index 00000000..b6ef5a7f
--- /dev/null
+++ b/usb_application/util.py
@@ -0,0 +1,5 @@
+
+def HEX(vals):
+    if vals is not None:
+        return ' '.join('%.2x'%x for x in vals)
+