Initially it was planned and tested to use several intermediate nrf24 hubs within the roof cavity to relay all the doorway wireless messages back to the base unit on the nurses desk.

After realising I didnt need to put a wireless node on each doorway, I still needed these relay hubs to have all the motion sensors wired up to. As due to the distances and physical firewalls that partition the roof cavity up into sections, I needed a wireless link between each group of wired together motion sensors to get the data back to the base.