This grower is fairly sure of this plant identification.
Wire plant, Maidenhair vine, Wire vine, Mattress vine, Necklace vine
Muehlenbeckia complexa (Wire plant). This is a semi-deciduous climbing shrub which grows about 4.5m or more. It produces swollen white berries with black seeds.
They prefer full sun with a little midday shade with moderately fertile, moist but well-drained soil.
Wall or trellis. Suitable for coastal conditions.