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@@ -20,3 +20,26 @@ Run `open_port.sh` to modify firewall to accept connection on the designated por
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Run `start.sh` to start the server. Look for output/log at `$HOME/logs/socketServer.log`.
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+### Debugging
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+
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+#### Open port
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+
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+To check whether packets from client reach the host, use
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+
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+```bash
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+tcpdump 'sudo tcpdump -i enp68s0 'tcp port 8000' -v
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+```
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+
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+This prints traffic to port 8000, say. Also helpful for determining actual IP address of the request; sometimes the actual source is behind a firewall and the IP could be mangled.
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+
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+This address should be added to the `$IPCLIENT` address list in `env.sh` for `open_port.sh` to allow connections.
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+
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+#### Allowed origins
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+
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+Websockets further limits allowed connections to clients listed in `websocketServer.py`. The origin is part of the `send.py` makeup - adjust it so that `websocketServer.py` will take it as trustworthy.
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+
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+The error associated with mis-configuration is
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+
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+```bash
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+websockets.exceptions.InvalidStatusCode: server rejected WebSocket connection: HTTP 403
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+```
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