export DISPLAY=:0.0 

Idea: creating images on pi and display these images as html files remotely

Use lighttpd as minimal webserver on pi

sudo apt-get install lighttpd 
sudo pip install plotly

Check status

 sudo systemctl status lighttpd 

Set access rights

 
sudo groupadd www-data
sudo usermod -G www-data -a pi
sudo chown -R www-data:www-data /var/www/html
sudo chmod -R 775 /var/www/html
 

restart service

 sudo service lighttpd force-reload 

move html file to be displayed into /var/www/html/

remote browser access html file by:

 http://192.168.1.xx/<filename> 

import plotly.graph_objects as go
import random

def nextvalue():
    return (random.randint(10,104))

def displayserver():
    while True:
        fig = go.Figure(go.Indicator(
            mode = "gauge+number",
            value = nextvalue(),
            domain = {'x': [0, 1], 'y': [0, 1]},
            title = {'text': "Temperatur"}))

        fig.write_html('/var/www/html/labor.html', auto_open=True)
#fig.show()

#
# Main
# 
if __name__== '__main__':
    try:
        displayserver()
    except KeyboardInterrupt:
        exit()