It would be better to use the Ecowitt integration that is included in HA now rather than the HACS version as the HACS version hasn’t been updated for a while.
Follow the steps on the integration page and path setting in your app should be something like the following and should match what was shown when you added the official Ecowitt integration. The port should be the normal HA port of 8123. I see you have tried to use port 4199 so you seem to be following the setup instructions for the HACS Ecowitt integration and not the official HA Core Ecowitt integration.
/api/webhook/{long string of characters}
When you setup the Ecowitt integration in HA, it should show you a screen with the details to enter into the app on your phone to configure the weather station:
