I try to send data by bluetooth Raspberry PI 3 and I have a problem on my Raspberry! the service Raspberry PI 3 COM port is not installed, I tried to follow this tutorial (viewtopic.php?p=947185#p947185) and for my part the file rfcomm.conf does not exist, by doing sudo nano /etc/bluetooth/rfcomm.conf me creates a new file, so I went to the bluetooth directory in etc and I did not find this file, so I think there is something which is not yet installed. I even did a test with:
What do I need to install to get this configuration file (rfcomm.conf) to enable the bluetooth COM port service?
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sudo rfcomm connect hci0 xx: xx: xx: xx: xx: xx Can't connect RFCOMM socket: Invalid exchange