I was thinking along the same lines as NetWallah, but I discovered that -agentaddr isn't recognized by SNMPv2c. Maybe this is closer to what you need.

#!/usr/bin/perl

use strict;
use warnings;
use Net::SNMP::XS;
use Net::SNMP qw(:ALL);

my ( $session, $error ) = Net::SNMP->session(
    -hostname  => '127.0.0.1',
    -community => 'public',
    -localaddr => '192.168.1.108',
    -port      => SNMP_TRAP_PORT,
    -version   => 'snmpv2c',
    -community => 'public',
    -debug     => '0x02',
    -nonblocking => 0,
);
if ( not defined $session ) {
    printf "ERROR: %s.\n", $error;
    exit 1;
}

my $result = $session->snmpv2_trap(
    -varbindlist  => [
    '1.3.6.1.2.1.1.3.0',     TIMETICKS,         600,
    '1.3.6.1.6.3.1.1.4.1.0', OBJECT_IDENTIFIER, '1.3.6.1.4.1',
    '1.3.6.1.2.1.1.1.0',     OCTET_STRING,      'Hub',
    '1.3.6.1.2.1.1.5.0',     OCTET_STRING,      'Closet Hub',
    ],
);
if ( not defined $result ) {
    printf "ERROR: %s.\n", $session->error();
}
else {
    printf "SNMPv2-Trap-PDU sent.\n";
}
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