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Bundled messages are ignored by dispatcher #190
Description
I am writing a listen server for the VMC Protocol, which is an OSC protocol that includes bundled messages.
https://protocol.vmc.info/english.html
I wrote a barebones server
from pythonosc.dispatcher import Dispatcher
from pythonosc import osc_server
if __name__ == "__main__":
dispatcher = Dispatcher()
dispatcher.set_default_handler(print)
server = osc_server.ThreadingOSCUDPServer(("0.0.0.0", 39539), dispatcher)
print(f"Serving on {server.server_address}")
server.serve_forever()However, the output is the same unbundled message repeating, with the bundled messages not getting printed.
...
/VMC/Ext/Blend/Apply
/VMC/Ext/Blend/Apply
/VMC/Ext/Blend/Apply
...
If I use this other script to simply listen directly to the socket, then I can see all of the bundled messages
import socket
from pythonosc.osc_bundle import OscBundle
from pythonosc.osc_message import OscMessage
UDP_IP, UDP_PORT = "0.0.0.0", 39539
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind((UDP_IP, UDP_PORT))
print(f"Listening on {UDP_IP}:{UDP_PORT}")
while True:
data, _ = sock.recvfrom(65535)
print(data)
print()Output:
...
b'/VMC/Ext/Blend/Apply\x00\x00\x00\x00,\x00\x00\x00'
b'#bundle\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00D/VMC/Ext/Bone/Pos\x00\x00\x00,sfffffff\x00\x00\x00Hips\x00\x00\x00\x00\xbc\xa21\xf8?\x90\xdb\xb5\xbb\xdbl:\xb8\xda\x17k\xbb\xf9a\x91:\xe5\xf8#?\x7f\xfe\x01\x00\x00\x00D/VMC/Ext/Root/Pos\x00\x00\x00,sfffffff\x00\x00\x00root\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xb7\x15)+\xbaGH\x8496\x99\xb1?\x7f\xff\xfb\x00\x00\x00L/VMC/Ext/Bone/Pos\x00\x00\x00,sfffffff\x00\x00\x00LeftUpperLeg\x00\x00\x00\x00\xbd\xe3\x187\xbd$_\x00\xb20\x00\x00\xbd\xae3\xf0\xbe@\x0cy<\xca\xbd\xde?zn\xc4\x00\x00\x00L/VMC/Ext/Bone/...
...
I feel like I am doing something wrong here, and I shouldn't have to bypass the Dispatcher to get bundled messages.
How can I do this without using Socket? Am I doing someething wrong here, or does dispatcher just ignore bundled messages?
Activity
attwad commentedon Oct 3, 2026
I think this should have been fixed by #196, please reopen if you are still experiencing this issue, thanks