diff --git a/src/trezor/wire/wire_io.py b/src/trezor/wire/wire_io.py
index 95017a7a8..6dc5d2f6a 100644
--- a/src/trezor/wire/wire_io.py
+++ b/src/trezor/wire/wire_io.py
@@ -1,5 +1,8 @@
+import ubinascii
+
 from trezor import msg
 from trezor import loop
+from trezor import log
 
 _DEFAULT_IFACE = const(0)
 
@@ -7,10 +10,12 @@ _DEFAULT_IFACE = const(0)
 def read_report_stream(target, iface=_DEFAULT_IFACE):
     while True:
         report, = yield loop.Select(iface)
+        log.info(__name__, 'read  report %s', ubinascii.hexlify(report))
         target.send(report)
 
 
 def write_report_stream(iface=_DEFAULT_IFACE):
     while True:
         report = yield
+        log.info(__name__, 'write report %s', ubinascii.hexlify(report))
         msg.send(iface, report)