The problem of connecting arduino and vvvv by bluetooth

help~ I want to connect the arduino with vvvv by bluetooth, so I use the firmataboard and I can also find the virtual com(two virtual com, one is coming in, another one is coming out), but I cann’t connect the virtual com, both of them, do you guys know how to use it?
Snipaste_2019-10-10_09-58-57

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