Use bytes to represent filter in bluez, fix #317

[tonyfettes]

I try to use beacontools to scan for Eddystone beacons, but encountered exact the same problem as in issue #317.

Another possible byte vs. unicode issue in bluez bindings I spot is function hci_send_cmd(). Its paramter params need to passed as bytes produced by struct module, but parsed as string (s#). Considering possible usage regressions it might bring, I didn't put its fix in this PR.

[ARIEnergy]

@tonyfettes Does the project pause to update???? Long time no fix the bugs and issues ....

[tonyfettes]

@ARIEnergy It seems so, but I'm not a maintainer so I don't know, sorry.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
PyBluez is not under active development, but we still accept pull requests!
If you've resolved your issue, please post your solution and close this issue. Future users will benefit from the knowledge you share. Thank you.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
PyBluez is not under active development, but we still accept pull requests!
If you've resolved your issue, please post your solution and close this issue. Future users will benefit from the knowledge you share. Thank you.

[tonyfettes]

close dun to #488