This is probably stupidly simple, but:

A secondary objective is to "use the nanosuit to interface with the disabled Ceph pinger."

OK, I'm there. The target is in the body of the thing, say ten feet off the ground.

How does one "interface" with it? I've actually jumped up onto one of the legs, just a few feet away from the target, but nothing happens. I guess I would kind of expect a brief cutscene, but nothing happens.

How does this work?

There's a YouTube playthrough I could check out, I guess, if I can't get a quick answer here-if he bothered with this particular non-essential objective.

Thanks for any help.

I can't remember. Wasn't to use the visor as when opening doors and so?

As in putting the target in the center of the visor reticle, and being prompted "Hack.(E)"? Tried that, did not get the prompt. But thanks anyway.

OK, so, like I said, stupidly simple.

It was some kind of anomaly or glitch. When I replayed it, I DID get the hack/unlock prompt in the visor. The scene played out it's little script, and I got credit for this secondary objective.

Go figure.