Octolapse timelapse with a Nikon D3300 triggered by MQTT messages via USB

main.py

#!/usr/bin/env python
import os 
import paho.mqtt.client as mqtt

def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))

    client.subscribe("octoprint/#")

def on_message(client, userdata, msg):
    print(msg.topic + " " + str(msg.payload))
    if (msg.topic == "octoprint/event/PositionUpdate"):
       print("Taking image")
       os.system("gphoto2 --camera 'Nikon DSC D3300' --capture-image-and-download --filename '%Y%m%d%H%M%S.jpg'")

       print("Image Taken")

client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message

client.connect("localhost", 1883, 60)

client.loop_forever()