BLE peripheral and central example in python using Bluez and Dbus

To enable the peripheral mode in gatt (server mode) you must enable the experimental features of the bluez stack

• Edit the file /lib/systemd/system/bluetooth.service and at the ExecStart=/usr/local/libexec/bluetooth/bluetoothd add at the end --experimental
• Then do a sudo systemctl daemon-reload
• And then a sudo systemctl restart bluetooth