[Observium] How to add a device which only responds to ping/icmp?

Hi

How can i add a device which cannot (!) speak any snmp and only responds to ping/icmp requests?

We have an Aruba wlan setup (Mobility Master and two Mobility Controllers) and i want to add the aps to Observium, so that they are monitored but only by ping/icmp.

(The MM and the two MCs are already added to Observium, but i cannot see if one AP went offline or came back online again)

The aps cannot speak any snmp when managed by the MM or MC, thats why it fails when i try to add one via ./add_device.php

I appreciate any help :)

Best,

Thomas