How can I add plugin to Nagios Core 4.X

[AkinBredailik]

I would like to ask, how can I add plugin (below) to the nagios core 4.X

http://exchange.nagios.org/directory/Pl ... ng/details
I always got an error:

Error: Service check command 'check_hping' specified in service 'HPING3' for host 'cam_chodba' not defined anywhere
I have defined command in /usr/local/nagios/etc/objects/commands.cfg :

define command{
command_name check-ping-on-port
command_line /usr/local/nagios/libexec/check_hping $HOSTADDRESS$ 100 500 $ARG1$
}
and host and service in /usr/local/nagios/etc/objects/switch.cfg :

define host{
use generic-switch
host_name cam_chodba
alias cam_chodba
address 1.2.3.4
check_command check-ping-on-port
hostgroups switches
}

define service{
use generic-service
host_name cam_chodba
service_description HPING3
check_command check_hping
}
when I'm trying run just a command, its running -->

root@onedata-desktop:~# /home/onedata/Downloads/check_hping 188.123.99.171 200 500 10201
OK: Average response time omegle shagle voojio 10 ms; packet loss 0%
Thank you for your help!

[gormank]

You named the command check-ping-on-port, not check_hping.