print "spawned:\n";
chdir ("/home/jj/go/bin/") ;
if ( -e "rtlamr" ) {print "Found rtlamr.\n";}
$pid = open($handle, "rtlamr -msgtype=scm+ --format=json -filterid=101419821,101419999 -unique=false" ) or die "Couldn't open file rtlamr, $!";