obex-client: how to select a dongle from muliple dongles to send-files

Hi, 
   Need some hint from the expert.
   I am using  test/send-files to send files. But when I have multiple dongles, I would like in run time to select which dongle to send out the file either using hci0/1 or the actual dongle address or other means. I tried trace it down but got lost. Anyone could provide some hint.

Ed



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