The Briar project is probably the most interesting project in this area. They recently released the first stable version [0] which includes bluetooth peer to pe

The Briar project is probably the most interesting project in this area. They recently released the first stable version [0] which includes bluetooth peer to peer messaging as a fallback if there is no internet connection available. WiFi peer to peer is also planned. I would recommend listening to this presentation from ccc about the project: https://media.ccc.de/v/34c3-8937-briar https://media.ccc.de/v/34c3-8937-briar [0]https://briarproject.org/news/2018-1.0-released-new-funding.html https://briarproject.org/news/2018-1.0-released-new-funding....