This feature was added in firmware v1.7.1 and was temporarily removed after v1.7.8 (latest version with feature). As of v1.8.6 this feature has been restored to the firmware for TRMNL OG.
TRMNL X pending future version.
Firmware Releases
If your WiFi configuration requires a username and password to connect, we have a feature for you.
After enabling WiFi pairing mode, tap your network's name like you would on a computer.
TRMNL will attempt to detect if the WPA2 protocol is being used, and if so, generate additional form fields below the network name where you can provide those credentials.