From 27a6338585de45fabbbe07aa4eb3e2a8dc015d72 Mon Sep 17 00:00:00 2001
From: LongHairedHacker <sebastian@sebastians-site.de>
Date: Sun, 20 Nov 2016 02:20:05 +0100
Subject: [PATCH] Fixed sniffer crashing on timeout

---
 README.md                   |  2 +-
 software/testutils/sniff.py | 10 +++++++---
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 1733c1c..ac5d5bf 100644
--- a/README.md
+++ b/README.md
@@ -82,7 +82,7 @@ Initial value: 0x0
 - Incoming messages are stored in a fifo until the application retrieves them.
 - The receive fifo has a size of at least 2 messages.
 - If the fifo is full new messages will override the older ones.
-    It is up to the application retrieve message in time.
+    It is up to the application to retrieve message in time.
 - Even if sending was successful, there is still a chance that the receiver could not
     receive the frame due to missing buffer space or not enough processing time to react.
     **Important messages should utilize a ack-mechanism.**
diff --git a/software/testutils/sniff.py b/software/testutils/sniff.py
index 1a368dc..3fe2b82 100644
--- a/software/testutils/sniff.py
+++ b/software/testutils/sniff.py
@@ -21,11 +21,15 @@ def main():
 
     ser = serial.Serial(sys.argv[1], 9600, timeout=0.40)
 
+    data = ""
     while True:
-        data = ser.read(19)
-        if data != "" and len(data) != 19:
+        while data == "":
+            data = ser.read(19)
+
+        if len(data) != 19:
             print "No Frame:\t" + hexdump(data)
 
+
         header_ok = data.startswith(chr(0xAA) + chr(0xFE))
 
         line = ""
@@ -43,7 +47,7 @@ def main():
         else:
             line += "CRC not Ok  "
 
-        line += hexdump(data)
+        line += hexdump(payload)
         print line