Network support with VPNKit

The simulation can be configured to use VPNKit to provide network support. While this was developed for macOS, it should work on other platforms as well.

Configuration

CONFIG_SIM_NETDEV=y
CONFIG_SIM_NETDEV_TAP is not set
CONFIG_SIM_NETDEV_VPNKIT=y
CONFIG_SIM_NETDEV_VPNKIT_PATH="/tmp/vpnkit-nuttx"

You can use the sim:vpnkit configuration, which includes the above settings.

./tools/configure.sh sim:vpnkit

VPNKit setup

See [https://github.com/moby/vpnkit]{.title-ref} for build instructions.

If you have Docker Desktop for Mac installed on your machine, you can find a vpnkit binary at:

/Applications/Docker.app/Contents/Resources/bin/com.docker.vpnkit

A docker image containing a static Linux binary is also available:

[https://hub.docker.com/r/djs55/vpnkit]

How to run

You can use it as the following:

% vpnkit --ethernet /tmp/vpnkit-nuttx &
% ./nuttx

NuttX's CONFIG_SIM_NETDEV_VPNKIT_PATH should match vpnkit's --ethernet option.