Hi Les,
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Welcome here as well :)
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Unfortunately I do not have sufficient knowledge about the workings of TC's Smarthand?
What I can tell you is that the YD9401 Module does not bridge traffic from WiFi to LAN and vice versa.
Running any control software ( not specific TC ) over WiFi I would never recommend as it is implied unreliable.
In general we advise ( and designed ;) ) the YD9401 WiFI to be used by handheld controllers like phone apps, WLAN? mice, TCS Throttles, wiFREDs, etc.
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Greets,
Karst
karst.drenth