sudo apt install zlib1g zlib1g-dev

##</code><code>##

$ ls
requires1.pm
$ cpanm --verbose --installdeps .
cpanm (App::cpanminus) 1.7044 on perl 5.028001 built for arm-linux-gnueabihf-thread-multi-64int
...
--> Working on .
Entering /home/pi/Documents/curate/req
Configuring /home/pi/Documents/curate/req ... N/A
! Configuring . failed. See /home/pi/.cpanm/work/1647208802.16932/build.log for details.
Expiring 16 work directories.
$ cat requires1.pm 
package requires1.pm;

requires 'AnyEvent::AIO' => '1.1';
requires 'Async::Interrupt' => '1.24';
requires 'Cookie::Baker::XS' => '0.09';
requires 'Device::Firmata' => '0.65';
requires 'Device::SerialPort' => '1.04';
requires 'Device::WebIO' => '0.022';
requires 'Device::WebIO::Dancer' => '0.004';
requires 'Device::WebIO::Firmata' => '0.002';
requires 'Device::WebIO::RaspberryPi' => '0.900';
requires 'DBD::SQLite' => '1.58';
requires 'DBI' => '1.641';
requires 'Guard' => '1.023';
requires 'GPS::NMEA' => '0.17';
requires 'Math::Round' => '0.07';
requires 'RPi::WiringPi' => '2.3628';
requires 'RPi::Pin' => '2.3606';
requires 'Plack::Handler::Twiggy' => '0.1025';
requires 'Starman' => '0.4014';
requires 'Time::HiRes' => '1.9758';
requires 'WWW::Form::UrlEncoded::XS' => '0.25';
1;
$ 

##</code><code>##

$ sudo fail2ban-client status sshd
Status for the jail: sshd
|- Filter
|  |- Currently failed:	0
|  |- Total failed:	0
|  `- File list:	/var/log/auth.log
`- Actions
   |- Currently banned:	0
   |- Total banned:	0
   `- Banned IP list:	
$ 

##</code><code>##

Crontab to broadcast RPi's address and name

##</code><code>##

crontab -e

@reboot hostname | socat -s - UDP-DATAGRAM:255.255.255.255:12340,broadcast 2>/dev/null * * * hostname | socat -s - UDP-DATAGRAM:255.255.255.255:12340,broadcast 2>/dev/null
##</code><code>##

$ sudo  ufw allow in 12340/udp
Rule added
Rule added (v6)
$ 

##</code><code>##

$ pwd
/home/pi/Documents/curate/req
$ ls
1.udplisten.pl  requires1.pm
$ perl -d 1.udplisten.pl -e '/HELLO xyZ129/'

Loading DB routines from perl5db.pl version 1.53
Editor support available.

Enter h or 'h h' for help, or 'man perldebug' for more help.

main::(1.udplisten.pl:77):	$Getopt::Std::STANDARD_HELP_VERSION = 1;
  DB<1> b 86                                                                    
  DB<2> c                                                                       
main::(1.udplisten.pl:86):	my $RXSZ = $opts{b}//1024;
  DB<2> p $EXPR                                                                 
/HELLO xyZ129/
  DB<3> c                                                                       

192.168.red.acted
Debugged program terminated.  Use q to quit or R to restart,
use o inhibit_exit to avoid stopping after program termination,
h q, h R or h o to get additional info.
  DB<3>                                                                         

  DB<3> save 1.udp.txt                                                          
commands saved in 1.udp.txt
  DB<4> q                                                                       
$ 
##</code><code>##

echo "HELLO xyZ129" | socat - UDP-DATAGRAM:255.255.255.255:12340,broadcast

##</code><code>##

sudo apt-get build-dep libnet-ssleay-perl