I'm looking for a way to have multiple Arduino's talking to each other. At the moment I'm using a RS485 module, but it can only handle 1 communication at a time, so I can't have 3 devices sending data.
I have read about mesh and it sounds really interesting in the way, that you somehow can make it self healing.
The thing I'll be using it for will be for access control and I have a large area where there will be doors and etc.
I'll then have an Arduino at every door where you'll scan the card and the device will have a list with all accepting cards. It'll then send to the master that the card is used, so that I can log it in the system. The master will update the slaves once in a while with a fresh list of cards.
Do you maybe have any recommendations on modules that I should look for to achieve this setup?
The whole setup can in the end be having up to 30+ devices and I can't live with the module I have now with only 1 message at a time.