It turns out that CAF doesn't like certain characters appearing in the datapoint identifier e.g. "." or "/". It also doesn't like numeric strings i.e. they must start with an alpha character e.g. "0", "1"... is no good. To cirmcumvent this, I used a character prefix i.e. "d0", "d1"... I managed to debug in the end by logging into the GOS via ssh and reproducing my app's requests. Perhaps the doc at https://developer.cisco.com/docs/iox/#app-visualization-dashboard/visualization-overview could be updated?
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