1 files changed, 16 insertions, 1 deletions

diff --git a/reversing_tools/abbott/extract_freestyle.py b/reversing_tools/abbott/extract_freestyle.py
index 39c52ad..69f0d02 100755
--- a/reversing_tools/abbott/extract_freestyle.py
+++ b/reversing_tools/abbott/extract_freestyle.py
@@ -25,8 +25,15 @@ import usbmon
 import usbmon.chatter
 import usbmon.pcapng
 
+_KEEPALIVE_TYPE = 0x22
+
 _UNENCRYPTED_TYPES = (
-    0x01, 0x04, 0x05, 0x06, 0x0c, 0x0d, 0x14, 0x15, 0x33, 0x34, 0x35, 0x71,)
+    0x01, 0x04, 0x05, 0x06, 0x0c, 0x0d,
+    0x14, 0x15,
+    0x33, 0x34, 0x35,
+    0x71,
+    _KEEPALIVE_TYPE,
+)
 
 def main():
     if sys.version_info < (3, 7):
@@ -53,6 +60,11 @@ def main():
               'will be dumped with the undecoded length as well.'))
 
     parser.add_argument(
+        '--print_keepalive', action='store_true',
+        help=('Whether to print the keepalive messages sent by the device. '
+              'Keepalive messages are usually safely ignored.'))
+
+    parser.add_argument(
         'pcap_file', action='store', type=str,
         help='Path to the pcapng file with the USB capture.')
 
@@ -91,6 +103,9 @@ def main():
 
         message_type = packet.payload[0]
 
+        if message_type == _KEEPALIVE_TYPE and not args.print_keepalive:
+            continue
+
         if args.libre2 and message_type not in _UNENCRYPTED_TYPES:
             # On Libre 2 (expected encrypted communication), we ignore the
             # message_length and we keep it with the whole message.