Add Bluetooth to snaps

This section will show what are the necessary bits in the snapcraft.yaml while snapping an application that uses Bluetooth.

Bluetooth Interfaces

There are two Bluetooth related interfaces available on Ubuntu Core:

• bluez: allows accessing the Bluetooth service through D-Bus API

• bluetooth-control: used to talk to the kernel-side of the Bluetooth stack directly.

Contents of snapcraft.yaml

The bluez snap runs the bluetoothd service. This service provides a D-Bus API that can be accessed by other application snaps by connecting to the bluez:service slot for the bluez interface provided by the bluez snap.

For this, the application snap must connect to the bluez slot by defining a plug, such as in the following snapcraft.yaml snippet:

plugs:
  client:
      interface: bluez

apps:
  foo:
    command: "bin/foo-command"
    plugs: [client]

If an application requires direct access to the kernel bluetooth stack, the bluetooth-control interface should be used instead. Installation of the bluez snap is then not required.