Hoya carnosa
A spindly (not many leaves or branches) climber that may be many metres long. It produces tight clusters of small thick plasticy flowers. These vary from white through pale to dark pink/red. Needs to be grown in the shade and even then, is difficult to keep alive in the summer heat. Might be more successfully if you could restrict its growth in a pot (by cutting it back when the heat started) and bringing indoors for the summer, but have not tried this.