Mesh over Bluetooth LE, TCP, or Reticulum

Columba is an innovative native Android application that provides secure messaging and voice call capabilities, operating independently of internet infrastructure or central servers. It leverages the Reticulum network to establish resilient mesh communication, focusing on privacy and user autonomy in various connectivity scenarios.

• Infrastructure-Free Communication: Send messages and make voice calls without relying on the internet, cellular networks, or any central server. This enables communication in compromised or unavailable network environments.
• Versatile Connectivity: Supports multiple transport layers including Bluetooth LE for proximate devices, Wi-Fi for local networks, LoRa radio via RNode for extended ranges, and TCP for global connections to Reticulum servers.
• Privacy-Centric Design: Features end-to-end encryption, operates without user accounts or tracking, and ensures no central points of control.
• Location and Mapping: Allows secure location sharing and viewing on a dedicated map, with support for offline map downloads in MBTiles format.
• Mesh Network Contribution: Users can contribute to the network's resilience and reach by allowing their devices to relay traffic for other participants.
• Identity Management: Provides tools to generate, manage, export, import, and share user identities via QR codes, compatible with other Reticulum clients.
• Customization: Offers custom color themes for personalized user interface aesthetics.

Built with a native Android interface and Material Design 3, Columba serves as a practical, open-source implementation of decentralized communication, offering a robust and private alternative for staying connected under diverse conditions.