This error is due to incompatibility issues with BlueZ 5 and SDP with bluetoothd

raspi-zero-w-fix-rfcomm.txt

Make sure, running sdptool browse local gives following error:

Failed to connect to SDP server on FF:FF:FF:00:00:00: No such file or directory

As it turns out, the culprit is bluetoothd, the Bluetooth daemon. Using SDP with bluetoothd requires deprecated features for some silly reason, so to fix this, the daemon must be started in compatibility mode with bluetoothd -C (or bluetooth --compat).

Find location of bluetooth.service by:

systemctl status bluetooth.service

Then edit bluetooth.service and look for

ExecStart=/usr/libexec/bluetooth/bluetoothd

Append --compat at the end of this line, save, and then run

service bluetooth start

If all goes well, you should be able to successfully run

sudo sdptool browse local

Finally, reset the adapter:

sudo hciconfig -a hci0 reset

FROM: http://stackoverflow.com/questions/33110992/python-code-for-bluetooth-throws-error-after-i-had-to-reset-the-adapter

Things should work fine now

thanks a bunch, this was driving me crazy!