Hi,
I installed the latest version of WD found in ZIP and checked the "Data share TCP/IP to 127.0.0.1 port 5511" box in the configuration screen.
In Weatherlink (5.9.3 or 6.0.3) on the same PC I configured the Communication Port as
Communication : TCP/IP
TCP Port : 5511
Remote IP address : 127.0.0.1
When pushing the Test button, I get the error message "TCP/IP : Communication error found. Check settings and try again"
I made a quick & dirty test with PuTTY connecting 127.0.0.1:5511. When the "data share ..." is disabled in WD, I get an error. Then the option is enabled, no error message anymore in PuTTY but an empty screen.
FYI, during the installation of Weatherlink I get a warning about a "newer driver 6.4 already installed". I guess it is related to Silicon Labs CP210x USB to UART Bridge which is 6.4.0.0.
The same configuration ran with VVP but communication crashed after a few hours.