Recently, ConnMan got support for iwd and WireGuard. The current support is only a starting point and it needs some more changes in the core code base to support the cool features:

• iwd: Add proper iwd agent support by pushding down the wpa_supplicant cruft from the core into the plugin layer.
• WireGuard: In order to support roaming the core needs to learn to run a VPN service without a transport.