Python ThreadedReader queue building up

[fnoop]

Long latency between the incoming data and the sending timestamp - up to 1s. This looks to be because the threadsafe FIFO queue is building up rapidly and not being processed quickly enough, so old data is being processed.
Changing to a LIFO queue helps, but the queue will build up infinitely and doesn't deal with the underlying problem.

[fnoop]

Temporarily addressed in cef02bd, by adding an additional logic to pop the FIFO queue if it gets above 10