Not a flower or fruit to be found on these plants, but I'm confident of the ID. The trailing habit and lack of any sort of woody stem mean it is not Myoporum, and although Rhagodia candolleana had adopted a similar trailing habit nearby(https://www.inaturalist.org/observations/162406647), it has more angular leaves. I'm more used to S. calendulacea as a plant of coastal dunes but have seen on cliffs in a couple of other locations.

Only seen in one small patch. Distinguishing this from S. apetala in the NSW Flora key is a bit tricky as measurements overlap, but the one useful feature seems to be that the capsule is longer than the calyx in procumbens and the same length in apetala, making this procumbens. It does give a bit of an impression of rooting at the nodes too, which is a procumbens feature.