I have wifilogger connected to a certain AP fine. Now I tried to connect the wifilogger to another AP with a different SSID. I can make the changes in the setup menu, press "save" but after restart "network info" tells me that it is still connected to the old SSID. Is that a bug? Is there a work-around like resetting the device to factory defaults and to start from there?
It is not a bug. It was programmed.
Connection after reboot is restored. Function which is connecting logger to WiFi is restoring old connection.
If you like to connect to new SSID, please disable old router and reboot WiFiLogger with white button. When there is no old SSID then it will be switched to new SSID.
I have to check it, but probably it is already changed in new firmware 2.25. It should drop old SSID when you click on SAVE, but still restoring connection after reboot.
There are some limitations also. Library will not accept some passwords like less than 8 characters. In this case, probably also old SSID would be used.