Testing playground to support the peernet protocol on android phones. The implementation above is a proof of concept android application. There is currently no modifications done to the peernet core to get it running on android phones. As a brief the entire project is done using Kotlin with Go mobile.

Disclaimer:

It is important to note that there could be scenarios where the phone could potencially freeze. The current commits are currently unstable.

Current Features:

Upload file to peernet
1. Add files to warehouse
2. Add file to blockchain
Download file from peernet
View latest files uploaded

Build steps/ Installation

The following steps below demonstrate how to build the application:

Install go mobile

go install golang.org/x/mobile/cmd/gomobile@latest

Initialize go mobile

gomobile init

// Todo

Implementation

// Todo

Indentified issue

The core-android only supports upto Android API level 29.

Api level 30 issue

The following is a list of the ways that apps are affected by this change (from Api level 30 onwards):

NetworkInterface.getHardwareAddress() returns null for every interface.
Apps cannot use the bind() function on NETLINK_ROUTE sockets.
The ip command does not return information about interfaces.
Apps cannot send RTM_GETLINK messages.

source (https://developer.android.com/training/articles/user-data-ids#mac-11-plus)

Possible solution

" SDK 30 prohibits syscall.NetlinkRIB(syscall.RTM_GETADDR, ...) which Go's net.Interfaces uses. Implement an Android specific version of net.Interfaces to use instead.

Passing primitive types across JNI is relatively straightforward, passing a single object of a complex class is annoying but still possible, but passing lists and other more complex data structures is way harder. As such, this commit added a Java routine to render the interface information to a string and pass that across JNI as a primitive type for Go code to parse. " PR with a solution: https://github.com/tailscale/tailscale-android/pull/21

Track issue