Problems connecting with Ubuntu16.04 (python sdk)

I am getting super slow connection in ubuntu using the python sdk. The bluetooth adapter I am using is an ASUS USB BT400. 
I have to set the timeout to 20 and even like this it times out. 
When I get to connect, I want to use sensor fusion, but when calling the following instruction:

c.sensorfusion.set_sample_delay(SensorFusionData.QUATERION, 20)

I get this exception:

pymetawear.exceptions.PyMetaWearException: Can't set data processor!

If I comment out this line, sometimes I manage to connect to two sensors, but the data arrives with a huge delay, around 3-5 seconds late. What can I do?


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