skip short reads

[air-quality] / mh-z19b.pl

diff --git a/mh-z19b.pl b/mh-z19b.pl
index b71b365..0c3fbd1 100755 (executable)
--- a/mh-z19b.pl
+++ b/mh-z19b.pl
@@ -29,7 +29,10 @@ while (1) {
        die $! if ! defined($len);
        if ( $len > 0 ) {
                my @v = unpack('C*', $string);
-               #warn "# $len ",dump($string), dump( @v ), $/;
+               if ( $#v < 8 ) {
+                       warn "# $len ",dump($string), dump( @v ), $/;
+                       next;
+               }
 
                my $sum = 0;
                foreach my $i ( 1 .. $#v - 1 ) {
@@ -38,7 +41,7 @@ while (1) {
                }
                $sum = 0xff - $sum + 1;
 
-               my $checksum = $v[8] || die "no checksum";
+               my $checksum = $v[8];
                my $co2 = $v[2] * 255 + $v[3];
                if ( $v[0] == 0xff && $sum == $checksum ) {
                        my $influx = "mh-z19b,dc=trnjanska co2=$co2 $t";