Allow vpython to be used remotely on a headless Pi #111
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Use the hostname to make the socket name.
vkotaru
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Aug 20, 2022
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@dannystaple -- another PR with similar changes just got merged (#219). I'd like to also add you to our contributors list even though this PR won't be merged. Would you like to be listed as "Danny Staples" or something else? |
"Danny Staple" would be good. Thank you. I'll close this as the other PR covers the same ground. |
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These changes are designed for using VPython on a headless (no screen/keyboard attached, remotely operated) Raspberry Pi. This is ideal for graphing or visualizing vectors and sensor data.
It could be used in other headless contexts.
By specifying the environment variables
VPYTHON_PORTa specific port number can be chosen instead of randomly assigning a free one. This means it can consistently offer the same port (useful when headless).Also on the headless Pi, it will be unable to launch a browser. So setting the
VPYTHON_NOBROWSERenvironment variable just prints the URL instead.It's imperfect, in that it still prints a "localhost" address instead of the device hostname (or .local name), and it seems not to play well with being closed, and then reopened on the same port (some kind of port binding issue).
A further todo of mine would be to change the exit conditions - so it's not down to the last browser to leave, but instead a specific stop condition. This time perhaps based on a runtime setting.