Here is a utility program that might help you confirm that your WIU or WTIU setup is correct. You can download this program from this DropBox link:
https://www.dropbox.com/scl/fi...st=yscmwkgg&dl=0
Just start it and you should see a list of the found WIU/WTIU in the upper right list box. 
If you want to rescan your network again, press the [Scan WIU] button.
Press the [Connect] button to create a WiFi connection the WIU that you select from the list.
Press [Handshake] and this program will show you the TIU number and number of AIU connected to this WIU/WTIU. You might see something like this:
Session Connected
H5 Response : H5 70973C94 okay
->
H6 Response : H66499F4B2 okay
->
x Response : x33
-> TIU/WTIU #4 with 3 AIU(s)
The [Find Engines] button will ask the TIU about the engines connected to it. Along with some technical information, you will see all of the engines that are associated with that TIU.
A&S 0-8-0 #211 : Reading Engines - TIU #4 : Engine # 2 of 18 Engine(s) Total
The [Send String] button will send whatever string you type in the box to the TIU. Don't use this unless you know TIU commend set.
Checking the "Debug Mode" checkbox will display a lot of technical information that may not be useful.
