ping activated upon outbound ping

Reproduction:

1. power on devkit
2. use wifi on devkit
3. see ip address of devkit
4. ping ip address of devkit from another machine (see host unreachable)
5. ping out from devkit
6. see inbound ping respond

Linux pureos 5.2.0-gafd16fece #1 SMP PREEMPT Tue Jul 9 14:16:30 PDT 2019 aarch64 GNU/Linux

Notice in the below ping unresponsive in the left pane (laptop) then becomes responsive

From 192.168.1.68 icmp_seq=116 Destination Host Unreachable
From 192.168.1.68 icmp_seq=118 Destination Host Unreachable
64 bytes from 192.168.1.144: icmp_seq=121 ttl=64 time=875 ms
64 bytes from 192.168.1.144: icmp_seq=122 ttl=64 time=4.45 ms

It becomes responsive DUE TO the outbound ping command

purism@pureos:~$ sudo ping 192.168.1.68                                                                  
PING 192.168.1.68 (192.168.1.68) 56(84) bytes of data.
64 bytes from 192.168.1.68: icmp_seq=1 ttl=64 time=122 ms
64 bytes from 192.168.1.68: icmp_seq=2 ttl=64 time=5.69 ms