Populating dash with data from udp thread

Dash Python
1

Hi i’m trying to update some plotly graphs with data received from udp thread. Basically ’ temp = rx.dataRxGraph’ in the update_graph_scatter() always returns blank. Any ideas?

import dash
from dash.dependencies import Output, Event
import dash_core_components as dcc
import dash_html_components as html
from random import random
import plotly
import socket
from time import sleep
import threading

class dataRxObj():
dataRxGraph = []

def socketThread():
UDP_IP = "127.0.0.1"
UDP_PORT = 5005

sock = socket.socket(socket.AF_INET, # Internet
                     socket.SOCK_DGRAM) # UDP
sock.bind((UDP_IP, UDP_PORT))
while True:
    data, addr = sock.recvfrom(1024) # buffer size is 1024 bytes
    print "received message:", data
    rx.dataRxGraph.append(int(data))

app = dash.Dash(name)
app.layout = html.Div(
html.Div([

    dcc.Graph(id='live-update-graph-scatter', animate=True),
    dcc.Interval(
        id='interval-component',
        interval=1*500
    )
])

)

@app.callback(Output(‘live-update-graph-scatter’, ‘figure’),
events=[Event(‘interval-component’, ‘interval’)])
def update_graph_scatter():

temp = rx.dataRxGraph
x = []
for i in range(0,len(temp)):
    x.append(i)

traces = list()
for t in range(2):
    traces.append(plotly.graph_objs.Scatter(
        x=x,
        y=temp, #y axis
        name='Scatter {}'.format(t),
        mode= 'lines+markers'
        ))
return {'data': traces}

if name == ‘main’:
rx = dataRxObj()
threads = []
td = threading.Thread(target=socketThread)
threads.append(td)
td.start()
app.run_server(debug=True)

2

Can you get data from the socket thing outside of the context of a Dash callback? If so, I reckon StackOverflow would be a better place to ask this question, since it might be that your problem has more to do with using sockets than Dash per se.