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PlotJuggler - ZMQ - Python minimal data source example

The following example serves as a starting point of how to develop a custom data source for PlotJuggler using Python and ZeroMQ.

In order to use it, configure PlotJuggler like this

PlotJuggler streaming

PlotJuggler config

import zmq
import time
import json
import math

# ZeroMQ setup
context = zmq.Context()
socket = context.socket(zmq.PUB)
socket.bind("tcp://*:5555")  # Bind to a port PlotJuggler will connect to

# Generate and send data
time_start = time.time()
try:
    while True:
        elapsed_time = time.time() - time_start
        value = {
            "timestamp": elapsed_time,  # Zeit in Sekunden seit Scriptstart
            "variables": {
                "sin": math.sin(elapsed_time),  # Sinuswelle
                "cos": math.cos(elapsed_time),  # Kosinuswelle
            },
        }

        # Sende Daten als JSON mit dem Thema "sincos"
        socket.send_string("sincos", zmq.SNDMORE)
        socket.send_string(json.dumps(value))
        time.sleep(0.01)  # 100 Hz Update-Rate
except KeyboardInterrupt:
    print("Datenstrom unterbrochen.")
finally:
    socket.close()
    context.term()

Now click Start in the streaming tab and don’t forget to drag the sin and cos variables to the plot.

PlotJuggler add curves

Output example

PlotJuggler Python ZMQ example