I get this error when trying to open 2 tx steams and 3 rx streams, where some 
usrps are both rx and tx: "RuntimeError: fifo ctrl timed out looking for acks"


I found a mention of the error on this page: 
http://www.ni.com/product-documentation/53455/en/


Which gives a workaround: Open an Rx and Tx session to the same list of 
devices. You can disable the unused channel in the session where you added it.


How do I interpret this in GRC?


My specific setup is that I want to:

--- TX using usrps with IP1 and IP2

--- RX using usrps with IP1, IP3, and IP4


How do I go about doing this? How do I fill out the device args fields and make 
the connections?


Thanks,


AB
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