Welcome to Headwind MDM Q&A, where you can ask questions and receive answers from other members of the community.
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This option is available in the version 1.23 of WiFi manager (see the download link here).
To add a hidden network, specify the hidden and security attributes:
{ "ssid": "My Hidden WiFi", "password": "password value", "hidden": true, "security": "WPA2-PSK"}
{
"ssid": "My Hidden WiFi",
"password": "password value",
"hidden": true,
"security": "WPA2-PSK"
}