Add some oneoff tools for comm-b decoding testing

oneoff/extract-comm-b.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python3
+
+# Run me like this:
+#  view1090 --no-interactive | ./extract-comm-b.py
+
+import re, sys, time
+from contextlib import closing
+
+commb_match = re.compile(r'^DF:\d+ addr:([a-zA-Z0-9]{6}) FS:\d+ DR:\d+ UM:\d+ (?:ID|AC):\d+ MB:([a-zA-Z0-9]{14})$')
+
+for line in sys.stdin:
+    match = commb_match.match(line)
+    if match:
+        addr, mb = match.groups()
+
+        with closing(open('commb/' + addr.upper() + '.txt', 'a')) as f:
+            print('%.3f %s' % (time.time(), mb), file=f)