I had the same problem … failing to connect to the home wifi.
My SSID was 22 letters long … this was the first problem.
I noticed that after a connect failure it would not display the entire SSID name
I changed that to an SSID that was 10 letters long
After a number of tries it still would not connect
In desperation I added a space after my SSID eg would not connect to “happy wifi” but would connect to “happy wifi ”
I am not sure if that made a difference and it just requires a number of times to connect but adding a space made it work for me.
Also do not bother looking for a wifi antenna.. like in the pictures and the instructions.

Good Luck Dave 82000137

@lumpylumpy There is no Wifi antenna, you got the latest A3 version that comes with an embedded antenna for a more convenient form factor.

@emogenet not quite sure what if the “repeated twice” thing, please post some screen shots with that so I can see. Yes you can call the script directly, the form is:
http://192.168.4.1/s?u=SSID&p=KEY

But please note the SSID and the KEY must be URL ENCODED. There are online tools for that, with a quick google search I found https://meyerweb.com/eric/tools/dencoder/

Timeouts are sometimes possible, due to the Wifi module being stressed a little, being used both as a client (to send data) and a server (to serve local webserver used for config) at the same time, via a 9600bps serial connection. However the configuration must work in all cases and has been tested so on all units shipped.

Please note that there’s a key length limit of 20 characters. Do not use longer passwords on the networks you connect the A3 to.

Hope this helps,