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baalexander / rosnodejs

A ROS client library using node.js
http://baalexander.github.com/rosnodejs/
MIT License
36 stars 8 forks source link

[tcpros -subscriber ] receiving a big message failed du to tcp window #33

Open maxired opened 12 years ago

maxired commented 12 years ago

Being a subscriber receiving a big mesage, ie a sensor_msgs/image with a big image, receiving the message failed.

The fact is that we try to parse the message but we have only a part of the message. We got only part of the message because du to the TCP behavior, the ros message is splitted in different tcp packets.

We need to bufferized the packet until the size of the received data is equal to the length of the message.

baalexander commented 12 years ago

Oh, interesting. I agree the packets need buffered then. Do you know if the TCP library emits an event when the payload has finished?

maxired commented 12 years ago

The fact is it's not TCP jobs. This is an "application" issue, and that's why the length is the first thing to be transmitted in the ROS message protocol.