Hello,
If you already have your custom hardware, the recommendation is to download BeeKit software tool, which enable you to develop applications based on SMAC (proprietary P2P or star network), or 802.15.4 MAC (IEEE-based applications).
For a simple star network, with several end devices connected to a central coordinator, I would rather recommend SMAC. But you can also try the MyStarNetwork example on 802.15.4 MAC.
BeeKit will allow you to generate your custom hardware target for CodeWarrior.
Hope it helps,
Best regards