I'm trying to connect a bluetooth module to a Raspberry Pi3 using gatttool. First, I launched gatttool with following command, and tried to connect;
$ sudo gatttool -b (MAC ADDRESS) -I
Then an error message was shown.
Error: connect: Device or resource busy (16)
I searched it and found some solutions. After that, I tried again.
$ sudo gatttool -t random -b (MAC ADDRESS) -I
Then it attempted to connect to the bluetooth module for a while, and showed following error.
Error: connect error: Connection refused (111)
I never heard about a situation that somebody encountered both of these errors. What can I do to solve it?
