workaround gpsd(8) bug "device read of xxx returned error or packet s…

…niffer failed sync"

README.txt

@@ -19,6 +19,16 @@ or
 (2b) killall gpsd; /usr/sbin/gpsd -b -N SLCLog.bin & sleep 1; cgps
 
 
+if you suffer from gpsd(8) "device read of SLCLog.bin returned error or packet sniffer failed sync"
+bug (https://savannah.nongnu.org/bugs/index.php?36409), or bigger captures you'll instead have to feed 
+it via TCP instead:
+
+(1)  tcpserver localhost 50100 ./gp2_to_bin.pl data/2/SLCLog.gp2 &
+(2a) /usr/sbin/gpsd -b -N -D4 -n tcp://localhost:50100 >& SLCLog.gpsd.txt # ctrl-c when you think it is finished
+or
+(2b) killall gpsd; /usr/sbin/gpsd -b -N tcp://localhost:50100 & sleep 1; cgps
+
+
 Raw strace log, when formatted nicely with parse_strace.pl only on first
 look looks somewhat similar to SiRF binary format, but is quite different.
 

gp2_to_bin.pl

@@ -6,6 +6,7 @@
 # Usage: ./gp2_to_bin.pl data/2/SLCLog.gp2 > slclog.bin
 #
 
+$|=1;
 
 while (<>) {
   next if /^\s*$/;				# skip empty lines
@@ -14,4 +15,5 @@
   s/#.*$//;					# remove comments at the end of line
   s/\s+//g; 					# no whitespace allowd for pack
   print pack "H*", $_;
+#  sleep 1;		# comment out if not affected by gpsd(8) bug https://savannah.nongnu.org/bugs/index.php?36409
 }