Advanced Ping module with UDP

[ghost]

I had import Advanced Ping module(ss_fping.php) with Cacti 1.2.5 /PHP 7.2 on Ubuntu 18 to do TCP/UDP ping,
ICMP & TCP seems fine,
but when use UDP ping client's upd port 161(snmp port), jsut got loss 100%.

I use nmap udp ping client had get value,

nmap -P0 -sU -p161 'client ip'

Host is up (0.18s latency).
PORT STATE SERVICE
161/udp open snmp

How to fix the udp ping udp port 161 problem?

Thanks