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check checksum before sending data to influx
[air-quality]
/
pms3003.pl
diff --git
a/pms3003.pl
b/pms3003.pl
index
1c5067b
..
2d52db8
100755
(executable)
--- a/
pms3003.pl
+++ b/
pms3003.pl
@@
-5,10
+5,12
@@
use strict;
use Device::SerialPort;
use Data::Dump qw(dump);
use Device::SerialPort;
use Data::Dump qw(dump);
-my $port = shift @ARGV || '/dev/ttyUSB
1
';
+my $port = shift @ARGV || '/dev/ttyUSB
0
';
my $influx_url = shift @ARGV || 'http://10.13.37.229:8186/write?db=telegraf';
$influx_url = 'http://10.13.37.92:8086/write?db=rot13';
my $influx_url = shift @ARGV || 'http://10.13.37.229:8186/write?db=telegraf';
$influx_url = 'http://10.13.37.92:8086/write?db=rot13';
+my $debug = $ENV{DEBUG} || 0;
+
my $s = new Device::SerialPort( $port ) || die $!;
$s->baudrate(9600);
$s->databits(8);
my $s = new Device::SerialPort( $port ) || die $!;
$s->baudrate(9600);
$s->databits(8);
@@
-36,11
+38,19
@@
while (1) {
my ($len, $string) = $s->read(24);
if ( $len > 0 ) {
my @v = unpack('n*', $string);
my ($len, $string) = $s->read(24);
if ( $len > 0 ) {
my @v = unpack('n*', $string);
- warn "# $len ",dump($string), dump( @v ), $/;
+ warn "# $len ",dump($string), dump( @v ), $/
if $debug
;
my $header = shift @v;
my $header = shift @v;
- if ( $header == 0x424d ) {
+ my $checksum = pop @v; # remove checksum
+
+ my $sum = 0;
+ foreach my $b ( unpack('C*', substr($string,0,-2) ) ) {
+ $sum += $b;
+ }
+ $sum = $sum & 0xffff;
+
+ if ( $header == 0x424d && $sum == $checksum ) {
shift @v; # skip len
shift @v; # skip len
- pop @v; # remove checksum
+
my $influx = "pms3003,dc=trnjanska ";
foreach my $i ( 0 .. $#v ) {
$influx .= "$names[$i]=$v[$i],";
my $influx = "pms3003,dc=trnjanska ";
foreach my $i ( 0 .. $#v ) {
$influx .= "$names[$i]=$v[$i],";