WebSocket access via port forwarding?

Q&A Forum › WebSocket access via port forwarding?

Steen Spaten asked 3 months ago

If my question is off topic then please dismiss me – or if you know where to find the answer please inform me.

In your book “Build Web Servers” 2nd edition you mention the handshake. “The handshake starts with an HTTP
request/response, allowing servers to handle HTTP connections and WebSocket
connections on the same port.” My question is somewhat related – but is not directly explained to my context – sorry for that. I am aware of your project which includes a SIM-card but that is not suitable for me.

My ESP webserver is running when I am on WiFi. I can press buttons and they respond as they should via Websocket communication. However I would like to reach the webserver from outside via port forwarding. I can open the page from outside, but I cannot execute any command via the websocket. I don’t know how to handle this. When I am home and with WiFi connected I can open the webserver and execute commands via a Chrome plugin called “Simple Websocket Client”. They respond as they should. But when I am accessing from outside I cannot open the webserver.

WiFiClient BellmaticUARTClient; // manage connections to BellUploadserver, allowing UART <-> TCP

WiFiServer bellmaticTcpServer(bellPort); // listens for incoming TCP connections on (default) port 8240

AsyncWebServer ESP32Server(80); // HTTP port – Communication to phone HTTP pages, buttons etc.

AsyncWebSocket buttonSocket(“/index”); // This is one of my Websockets

AsyncWebSocket updateSocket(“/wsBtnUpd”); // This is the other Websocket

AsyncWebSocketClient *phoneClient = nullptr;

AsyncWebSocketClient *bellClient = nullptr;

The WiFiClient and WiFiServer is taking care of the UART to TCP conversion.

Hope someone can help…

1 Answers

0 Vote Up Vote Down

Sara Santos Staff answered 3 months ago

Hi.
I’m sorry, but we don’t have any tutorials about WebSocket via port forwarding and I’m not familiar with that specific subject.
I’m sorry that I can’t help much.
Regards,
Sara