What is "connman"

ConnMan - connection manager is a daemon for managing Internet connections within embedded devices.

The ConnMan project provides a daemon for managing internet connections within embedded devices running the Linux operating system. The Connection Manager is designed to be slim and to use as few resources as possible, so it can be easily integrated. It is a fully modular system that can be extended, through plug-ins, to support all kinds of wired or wireless technologies. Also, configuration methods, like DHCP and domain name resolving, are implemented using plug-ins. The plug-in approach allows for easy adaption and modification for various use cases.

Originally created as part of Intel's Moblin effort. Now used by OpenELEC, and Mer (software distribution) and therefore by Sailfish OS and Jolla, which are based on it, as well.