From fb454c0a10bec53904a81fd4ea9cd3f02273f49a Mon Sep 17 00:00:00 2001
From: Oliver Jowett <oliver@mutability.co.uk>
Date: Thu, 15 Sep 2016 15:08:50 +0100
Subject: [PATCH] faup1090: accept squawks, idents as "useful" things.

---
 net_io.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/net_io.c b/net_io.c
index 35e94d9..ef08516 100644
--- a/net_io.c
+++ b/net_io.c
@@ -1924,6 +1924,8 @@ static void writeFATSV()
             if (a->callsign_valid.source == SOURCE_TISB) {
                 used_tisb = 1;
             }
+
+            useful = 1;
         }
 
         if (trackDataValidEx(&a->squawk_valid, now, 120000, SOURCE_MODE_S)) { // we accept quite old squawks as they shouldn't change often
@@ -1931,6 +1933,7 @@ static void writeFATSV()
             if (a->squawk_valid.source == SOURCE_TISB) {
                 used_tisb = 1;
             }
+            useful = 1;
         }
 
         // only emit alt, speed, latlon, track if they have been received since the last time
@@ -2025,9 +2028,8 @@ static void writeFATSV()
             useful = 1;
         }
 
-        // if we didn't get at least an alt or a speed or a latlon or
-        // a heading, bail out. We don't need to do anything special
-        // to unwind prepareWrite().
+        // if we didn't get anything interesting, bail out.
+        // We don't need to do anything special to unwind prepareWrite().
         if (!useful) {
             continue;
         }