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Is there any easy way to receive data on cheap USB Bluetooth dongle and all of data send to the UART in Raspberry?

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Welcome to SE :) Plase have a look at meta.stackexchange.com/a/3021/180072 – XTL Dec 13 '12 at 7:52
Just to clarify: You want to receive over Bluetooth into USB, then re-transmit through the UART? – Andrew Dec 20 '12 at 11:34
up vote 1 down vote accepted

You should look at socat for attaching sockets to sockets, including network, tty, files, proxies etc. It might be as easy as:

$ socat /dev/ttyUSB0 /dev/ttyS0

(You need the right devices, of course.)

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