About USR Link
When one USR module works in AP mode, it opens a UDP port used to receive fast access Wi-Fi commands. A mobile device can directly connect to the Wi-Fi network of the module. USR Link can then be used to send commands to the USR module to search a router list and set the network SSID and password. After the completion of setup, the USR module will automatically restart, connect to the router, and work in STA mode.