When a point does not update, Mango - as you would expect - just logs the last recorded value. And as you would again expect, both DGLux's charts and Mango's built in chart feature will 'draw a line' between two values.
But, in cases where we have an extended gap in the data, this can produce pretty ugly results, as per the attached (note I was using the 'spline' chart method):
I'm struggling to think of a way to prevent this, either in DGLux or within Mango. Any ideas?