Changes
/* Network (@PTL) */
<pre>
iptables -t nat -A PREROUTING -p tcp --dport 5000 -j DNAT --to-destination raspi_internal_ip:5000
</pre>
<pre>
#ACTION SOURCE DEST PROTO DEST PORT
DNAT net loc:local-IP-address[:local-port] protocol port-number
DNAT net loc:raspberrypi udp 5000
</pre>