LukaQ, my bad, I didn't notice this reply!
I currently identify the nodes by modifying the datapacket. The format I'm using for the packet is like this: i:2,t:23.56,h:45.21
In the above example, I add "i:2" referring to node #2. I change it to "i:43" for node #43. I'm parsing that out in backend. Just wondering if this will scale up to several 20-30 nodes, as I plan on purchasing several Moteinos with the RFM96 chips. The other problem is, what is the "gateway" node ID? All nodes can listen and transmit to all others, so it appears that with lower bandwidth, there would be more traffic and interference as you increase the number of nodes, and consequently, lost packets.