Add buffersize to parameters

[chadek]

When I first try to retrieve data from my Axpert vm 3k plus I figured out that qpiri answer of my device was not 97 bytes, as set in this code but 98. So I used @ned-kelly code in this repo and manage to make a use of my device by playing with the buffer size parameters. I suggest to add these changes to the original code, adding default values.

I set qpiri buffer to 98 by default has it work for me but if 97 is a valid value for other type of devices, we can put it back to 97.

[manio]

Thanks!