I have 10 Rasp. I want to communicate them with each other. Making one of them as an hot-spot Wi-Fi access point and connect the other 9 Rasp. to it, is possible. But it is not fault tolerant. If the Wi-Fi Hotspot Rasp. fails, then all the networking will be broken. Rest of the 9 Rasp. cannot communicate each other. Any idea? How can I configure, each Raspberry to become an access point whenever needed?