Hydra is a distributed emulation framework for large-scale software testing in disrupted networks. The Hydra Node Daemon (hnd) is a small component which must run on all nodes and performs remote actions.

./autogen.sh
./configure
make dist

Place the generated .tar.gz file into the dl folder of the OpenWrt source.

Copy the contents of the <repository>/openwrt to the source of OpenWrt. Then generate the Node Daemon Archive and place it into the dl folder of the OpenWrt source. Finally, configure OpenWrt to include the hnd package in the build.