Okay, I found an entry in this forum https://discuss.moodlebox.net/d/198-wifi-client-advice/6 which could answer my question.
What happens when the firmware sends an error because no connection is possible? What happens if a connected device goes away from the wifi? How long does it need to connect a new device to the driver?
Can we see how many devices are currently connected to the driver? As we see in the the ip range
dhcp-range=wifi,10.10.10.10,10.10.10.254,255.255.255.0,4h we can get 245 leases in the dhcp list ... in the last address position we can get all numbers from 10 to 254. The problem is that the driver only allows 20 or 24.
Yes, I would say that all devices were connected in my test because all devices were running in the same room. But when a device gets to sleep mode then it disconnects from the driver and a new device can connect. Is this correct?