From the hex-net device page
WiFi Requirements:
To use the HEX-NET wirelessly, it needs to communicate via 802.11 b/g at 2.4 GHz. This means that for Access Point mode, the client device with the web browser (laptop computer, tablet, etc.) needs to support 802.11 b/g at 2.4 GHz. To use the HEX-NET in Infrastructure mode, both the client device and the router that is connected to the Internet need to support 802.11 b/g at 2.4 GHz.
Specifically, 5 GHz WiFi is not supported nor are channels 12 and 13 supported.