custom source block in python

[JORGE GONZALEZ ORELLANA]

hi everyone

I have been working on a block that takes measurements from a device but when I connect it 
to a QT gui time sink block, I only get the instantaneous measurement (just a flat line) 
and the shape of the curve over time is not recorded.

Does anyone know how to get the curve to be displayed and not just the last instantaneous value?

i can attach the code that i have been working on if you need you see it

good day