There are 2 ways to connect to the network with the TSP100IIIW, the first of which only works if there is a WPS button on the router.
The first option:
Press and hold the PAIR key until the printer's LED (blue) flashes.
Press the WPS key on the access point or router.
If the connection is successful, the printer LED (blue) will change from flashing to steady.
If the connection to your network is successful, you should see a configuration document indicating that the printer is a printer with the SSID of your network. It will then specify IP parameters for the network. The default gateway will match that of your network.
The second option:
In Settings, Wi-Fi, connect to the printer. Then go to the TSP100III Utility App (TSP100 Utility App).
Select Unselected State, then select the printer and click Apply in the lower right corner.
Then click Back and select Device Management
Select Login from the side menu. The initial login is: Username: root, Password: public
Then select WLAN Settings.
Activate the Infrastructure mode.
Set the SSID to the name of the router you are using. (It will be the exact name that appears in Settings, Wi-Fi)
Set Security to the security type that the router uses.
Set the security key to the password of your wireless network.
After you have submitted the information, click Save on the side menu. Then select Save -> Configuration Print -> Restart the device and click Run.