The Cloak firmware is based entirely on OpenWrt with some tweaks.
The Cloak firmware has been developed mostly on the Dragino MS-14P. While the final production hardware of Cloak is still not available, we do know that it will be binary firmware compatible with the Dragino MS-14P (using the same flash layout, almost the same GPIO's for LED's etc.).
The production hardware of Cloak is based on a Dragino HE mounted on an in-house designed board with necessary support hardware.