I just want to know your recommendation about this.
I am looking for a device with these requirements:
WIFI with the possibility to attach an antenna and use 2 SSIDs.
SD Card reader.
Price no more than 30$ - 50$, but a bit more would be also considered.
LEDE support (of course)
The use case is this: attach the device to a fast internet connection using the cable and share internet with several close neighbours. One SSID for a captive portal and another one is a private network encrypted. Should support SD Card because a lot of statistics would be written in a SQL database, so only flash is discarded. It should have an antenna connector, to use an outdoor antenna. Just that.
I already tried Raspberry Pi Zero, RPI 3 and Orange Pi. None of them support more than one SSID (which is annoying, most wifi adapters do it). Moreover, raspberries don't have an antenna connector, and adding that manually could bring legal problems (because regulations invalidation).
I also tried a Mikrotik router and it is really powerful (WIFI), but it only has flash memory.
Perhaps using a USB dongle could be another possibility.
Thanks a lot for your ideas.