Fix queueing/resending very old Mode A/C messages.

Fixes #47.

debian/changelog

@@ -12,6 +12,7 @@ dump1090-mutability (1.15~dev) UNRELEASED; urgency=medium
  received data clobbering old data under CPU overload.
  * Fix endian issues affecting big-endian hosts in Beast input/output
  and avrmlat output. (github issue #44)
+ * Fix queueing/resending very old Mode A/C messages (github issue #47)
 
  -- Oliver Jowett <[email protected]> Thu, 19 Feb 2015 22:39:19 +0000
 

mode_s.c

@@ -1221,18 +1221,17 @@ void useModesMessage(struct modesMessage *mm) {
  // Otherwise, apply a sanity-check filter and only
  // forward messages when we have seen two of them.
 
- // TODO: buffer the original message and forward it when we
- // see a second message?
-
  if (Modes.net) {
- if (Modes.net_verbatim || a->messages > 1) {
+ if (Modes.net_verbatim || mm->msgtype == 32) {
+ // Unconditionally send
+ modesQueueOutput(mm);
+ } else if (a->messages > 1) {
  // If this is the second message, and we
  // squelched the first message, then re-emit the
  // first message now.
  if (!Modes.net_verbatim && a->messages == 2) {
  modesQueueOutput(&a->first_message);
  }
-
  modesQueueOutput(mm);
  }
  }