Archive for the ‘perl’ Category

Perl bluetooth communications

Friday, May 20th, 2022

I had a couple of notes on using Net::Bluetooth from a raspberry pi to talk to a Bluetooth serial port because I couldn’t get the example code given with Net::Bluetooth to work.

The following will connect to a mac address and send and receive data from it (in this particular example, a ESP32):


use Net::Bluetooth;
use Data::Dumper;
use IO::Handle;
my $obj = Net::Bluetooth->newsocket(“RFCOMM”);

$addr = ‘C4:4F:33:58:B6:FB’;
$port = 1;

if($obj->connect($addr, $port) != 0) {
die “connect error: $!\n”;

my $fh = $obj->perlfh();


print “sending \n”;

print $fh “V\n”;
print “receiving\n”;

$buf = readline($fh);
print “Fetchhost: $buf\n”;

Perl arg parser

Monday, June 10th, 2013

I use this a lot when writing a simple perl script that I want to take args like –flag and –database=this and –comment=”This is a comment with spaces”

while($arg = shift) {

if(($s1,$s2) = $arg =~ /–(.*)=(.*)/) {
$l1 = lc $s1;
$s2 = $a if(($a) = $s2 =~ /^\”(.*)\”$/);
$arg{$l1} = $s2;
} elsif(($s1) = $arg =~ /–(.*)/) {
$l1 = lc $s1;
$arg{$l1} = 1;

Stick it in the top of the script, and you can then just use

if($arg{‘flag’}) {


$comment = $arg{‘comment’};

and so on and so forth.