feat: add connect-mqtt command

README.md

@@ -16,8 +16,7 @@ Copyright (C) 2023 Vladimir Vukicevic
 
 ## Usage
 
-Python 3 is required. There are no other requirements, but you should
+Python 3 is required. Use `pip install -r requirements.txt` to install dependencies.
-install the `alive-progress` package for nicer progress bars (`pip3 install alive-progress`).
 
 ### Printer status
 
@@ -28,6 +27,15 @@ $ ./cassini.py status
   File Transfer Status: 0
 ```
 
+### Printer(s) full status
+
+```
+$ ./cassini.py status-full
+```
+
+Will print out the full json status of all printers found.
+
+
 ### Watch live print progress
 
 ```
@@ -49,6 +57,16 @@ MyFile.goo |██████████████████████
 $ ./cassini.py [--printer printer_ip] print Myfile.goo
 ```
 
+### Connect printer(s) to particular MQTT server
+
+```
+$ [sudo] python cassini.py [--printer printer_ip] connect-mqtt mqtt.local:1883
+```
+
+Probably you need to use `sudo` (at least on MacOS, or you'll get `Permission denied: could not open /dev/bpf0. Make sure to be running Scapy as root`).
+
+If `--printer` is not specified, all printers found will be connected to the same MQTT server.
+
 ## Protocol Description
 
 The protocol is pretty simple. There is no encryption or any obfuscation that I could find.

cassini.py

@@ -7,6 +7,8 @@
 # License: MIT
 #
 import os
+import pprint
+import socket
 import sys
 import time
 import asyncio
@@ -63,6 +65,11 @@ def do_status(printers):
         print(f"    File: {print_info['Filename']}")
         print(f"    File Transfer Status: {FileStatus(file_info['Status']).name}")
 
+def do_status_full(printers):
+    for i, p in enumerate(printers):
+        pprint.pprint(p.desc)
+
+
 def do_watch(printer, interval=5, broadcast=None):
     status = printer.status()
     with alive_bar(total=status['totalLayers'], manual=True, elapsed=False, title=status['filename']) as bar:
@@ -135,6 +142,7 @@ def main():
     subparsers = parser.add_subparsers(title="commands", dest="command", required=True)
 
     parser_status = subparsers.add_parser('status', help='Discover and display status of all printers')
+    parser_status_full = subparsers.add_parser('status-full', help='Discover and display full status of all printers')
 
     parser_watch = subparsers.add_parser('watch', help='Continuously update the status of the selected printer')
     parser_watch.add_argument('--interval', type=int, help='Status update interval (seconds)', default=5)
@@ -146,6 +154,9 @@ def main():
     parser_print = subparsers.add_parser('print', help='Start printing a file already present on the printer') 
     parser_print.add_argument('filename', help='File to print')
 
+    parser_connect_mqtt = subparsers.add_parser('connect-mqtt', help='Connect printer to particular MQTT server')
+    parser_connect_mqtt.add_argument('address', help='MQTT host and port, e.g. "192.168.1.33:1883" or "mqtt.local:1883"')
+
     args = parser.parse_args()
 
     if args.debug:
@@ -171,6 +182,19 @@ def main():
         do_status(printers)
         sys.exit(0)
 
+    if args.command == "status-full":
+        do_status_full(printers)
+        sys.exit(0)
+
+    if args.command == "connect-mqtt":
+        mqtt_host, mqtt_port = args.address.split(':')
+        try:
+            mqtt_host = socket.gethostbyname(mqtt_host)
+        except socket.gaierror:
+            pass
+        for p in printers:
+            p.connect_mqtt(mqtt_host, mqtt_port)
+
     if args.command == "watch":
         do_watch(printer, interval=args.interval, broadcast=broadcast)
         sys.exit(0)

requirements.txt

@@ -1 +1,2 @@
 alive-progress==3.1.4
+scapy==2.5.0

saturn_printer.py

@@ -14,6 +14,7 @@ import asyncio
 import logging
 import random
 from enum import Enum
+from scapy.all import IP, UDP, send
 
 SATURN_UDP_PORT = 3000
 
@@ -320,3 +321,16 @@ class SaturnPrinter:
         }
         self.mqtt.publish('/sdcp/request/' + self.id, json.dumps(cmd_data))
         return hexstr
+
+    def connect_mqtt(self, mqtt_host, mqtt_port):
+        """
+        Connect printer to MQTT server
+
+        It spoofs UDP packet to the printer to make it connect to particular MQTT server
+        """
+        ip = IP(dst=self.addr[0], src=mqtt_host)
+        any_src_port = random.randint(1024, 65535)
+        udp = UDP(sport=any_src_port, dport=SATURN_UDP_PORT)
+        payload = f"M66666 {mqtt_port}"
+        packet = ip / udp / payload
+        send(packet)