Mercury consists of two components. The basic messenger and an extension called NetBridge. What are you interested in?
Mercury is a DIY communication system. It acts as a web-based group chat. The project is open source and can be hosted at home on a Raspberry Pi or at an online hosting service of your choice. Since the server's code is freely accessible and offers a self-hosting option, you have complete control over data sharing with third parties. So if you would like to have your own messenger under your own control and prefer to keep your personal data on your own server, Mercury is for you.
Mercury has now been expanded to include the NetBridge. A "bridge" that establishes a connection to the Internet. It uses the LoRa frequency range (up to 10km range with perfect conditions) to provide access to the Messenger at locations without reliable internet access, extending the range and availability of the Mercury network.