Updating Data on dashboard using Socket.io connection

[kalamnaki]

Hi everyone,

I’m currently trying to make use of socket.io to connect to upload data every 20-30 seconds from a socket.io server to update a plot to track a scientific instrument. Does anyone know if this is something that is supported and/or if there is a better alternative? I’ve implemented the below solution.

I implemented this version below. The problem is that I’d like a plot to update with the information as well as update some text on the dashboard with some info as well. Currently it just updates the session information value but I doesn’t effect the visuals without a rerun.

Using session_state within socketio client events

The error you encountered suggests that the event listener function (catch_all) executed by the socketio library is running in a separate thread, which doesn’t have access to the st.session_state object. This is because st.session_state is specific to the Streamlit framework and is not designed to be shared across different threads or external libraries. To work around this limitation and achieve communication between your Streamlit app and the socketio server, you can consider the following ap…

(edit) Since I’ve figured out you can store the socket.io client in the session_state as well to enable you to maintain a single connection while using streamlit even during each rerun. I’m not sure how secure this is for critical connections but if using as a mostly local connection as I am this should work ok.

Best,
Kalamnaki