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I tried doing an echo test through websocket.org and received an error saying undefined. So, it looks like the server isn't accessible to other devices. Is there a way that I can use my own computer to send information from the leap server to an external server that is accessible to the ESP? I don't have much experience with web development and javascript in general. Or are there any other workarounds that you can recommend?
You do need the port number.
Can you check that the leap motion server is accessible for other devices? It's possible that default configuration or firewall rule block the communication.