The Serval Mesh app for Android is built from two components:

• Batphone is the user interface - a conventional Android app written in Java J2SE 5.0 and XML and built using the Android SDK
• Serval DNA is the core networking, encryption and file sharing component - a daemon written in GNU C and built using the Android NDK.

To contribute code or documentation to Serval Mesh, please observe the Serval Project's Software Development practices and refer to this page for procedures and resources that pertain specifically to Serval Mesh.

Copyright in all Batphone source code (including technical documentation) is either owned by Serval Project Incorporated or is owned by its author and licensed to the public under non restrictive terms. Contributors can assign copyright to Serval Project Incorporated by furnishing a signed Developer Agreement.

See Serval DNA Copyright for information about Serval DNA.

The Batphone source code is licensed to the public under the terms of the GNU General Public License, version 3.

See Serval DNA Licensing for information about Serval DNA.

The Batphone source code and accompanying technical documentation are controlled using Git and held in the Batphone Git repository, which contains two main branches:

1. The head of the Batphone Git master branch is always the latest public release. Each release is tagged with its version number, for example 0.08, 0.90.
2. The Batphone Git development branch holds code that is intended for the next release. All commits on this branch should build cleanly (no warnings), and install and run okay.

Large-scale code changes that break the build, installation or execution of Serval Mesh are performed in “feature” branches, which are merged into the development branch and deleted once complete.

All Batphone technical documentation resides in the Batphone source code repository. Here are links to the latest versions of Batphone technical documents (in the development branch on GitHub):

• Batphone build and installation instructions
• Draft Serval Mesh release notes
• Draft Serval Mesh privacy policy
• other Serval Mesh technical documents

The API Documentation introduces the various APIs exposed by the Serval Mesh app.

The Serval Mesh Sampler application contains examples of how to use the Serval Mesh APIs.

The Serval Mesh app is available for open Beta testing on Google Play, so anybody with a Google account can install and test the latest Beta version. Furthermore, members of the serval-project-developers Google group can test the Alpha version.

1. Sign in to Google (requires a Google account)
2. To install the most recent Alpha or Beta version, join the serval-project-developers Google group; to install only the latest Beta version, do not join that group
3. Go to the https://play.google.com/apps/testing/org.servalproject opt-in page and sign up as a Tester
4. Install the Serval Mesh app from Google Play – the Alpha or Beta version will be installed

The Batphone test plan is used to manually test the Serval Mesh Release Candidate prior to every release.

There is a single automated test case for MeshMS in the Batphone tests directory. It uses the Bash test framework and requires two Android devices connected via USB with the Serval Mesh app installed and running.

The Serval DNA component has an extensive suite of automated tests, and its own testing and quality assurance policies and procedures.

The Serval Project intends to increase the use of automated testing and release QA processes in future, and encourages the use of unit testing and Test Driven Development by its contributors.

Follow the Serval Mesh release procedure to make a new release of the Serval Mesh app.

• Learn about about Serval Mesh version numbering.
• See the full list of Serval Mesh releases.

Serval Mesh bugs and issues are tracked using GitHub Issues. Each component of Serval Mesh has its own GitHub repository, so each component has its own issue list. When reporting a bug in Serval Mesh, you must first choose whether to report it as a Batphone issue or a Serval DNA issue:

• Batphone issues pertain to the Java/XML Android user interface code. These will generally include installation/upgrade problems, failures on new or untested devices, display or usability problems, missing features, voice call quality, and interactions with other apps.

• Serval DNA issues pertain to Serval DNA core services. These will generally include failure to transport shared files or text messages, failures to detect or connect with other devices, and other failures in core Serval services.

It can be difficult to decide between a Serval DNA issue and a Batphone issue, especially without strong technical knowledge of the source code. If in doubt, contact a Serval Project team member first, or report it as a Batphone issue by following the instructions for reporting Serval bugs.

Versions of Batphone prior to 0.90 depended on the third-party apps SMSDroid and WebSMS, which had to be downloaded and installed separately from Serval Mesh. The pre-0.90 Batphone source code included parts of the SMSDroid source code to act as a client of that app. These dependencies were removed in version 0.90 “Shiny”.