None of our clubs have hit a limit on the number of connected devices. At Chislehurst we have had as many as 22 devices in use. St Julians regularly have 18 at club sessions and I believe they have previously done a successful test with 22 devices.
Sometimes router vendors state that their product will support a certain number of connected devices, e.g. 10, but I think this is probably based on the throughput that the router can support rather than being a hard limit. The BridgePal application does not put a heavy load on the network so router throughput should not be a limitation.
I found this thread questioning number of devices that can be connected to a Home Hub 3.0, the consensus there seems to be that there isn't a low limit -
https://community.bt.com/t5/Connected-Devices-Other/How-many-devices-can-home-hub-3-support/td-p/1515620I don't know if any of our clubs are using a BT router, but except in a few cases I don't know which router they are using. I know that St Julians and Otford clubs use a TalkTalk router. I haven't heard of any club having wireless connection problems.
You mention that you are now able to connect all but one of your devices but what did you change in order to get them working - was it just a case of changing the wireless channel ? Are all of your devices the same type ? Does the device which is having problems connect if you power the other devices off and reboot the router ? I have very occasionally seen a problem where a device appears to be connected to the router but cannot communicate with the PC, even though it receives broadcast messages (as evidenced by the "Find BridgePal Server" function in the app). I have been able to fix this by setting wifi "off" and then "on" again in the device settings.
Is it possible someone else in the club has a spare router that they wouldn't mind donating to the cause ? Quite often, when people change ISPs, they acquire a new router from the ISP and don't have to return the old one. Alternatively, you may be able to pick one up on eBay quite cheaply.
John