dis
root@monitoring:/opt/observium# snmpwalk -v1 -c hpups01 --hexOutputLength=0 -ObentxU 192.168.107.71 .1 > myagent.snmpwalk
Timeout: No Response from 192.168.107.71
root@monitoring:/opt/observium#
root@monitoring:/opt/observium# snmpwalk -v1 -c hpups01 --hexOutputLength=0 -ObentxU 192.168.107.71 .1.3.6.1.4.1 >> myagent.snmpwalk
Timeout: No Response from 192.168.107.71
root@monitoring:/opt/observium#
idk why timeout but from web ui it's work fine.

Your device seems as broken (with memory leak).
I improved detect it in r11165.
But you won't get any useful data from such a device.
Try updating your device to the latest firmware or write to the manufacturer.