Re: Can not subscribe ROS msg in real time using NI IC3173

[Chris Rogers]

Unfortunately we have not touched this in quite a few years - so who knows (although that latency is really bad) - I would recommend using the new python node and using rospy - it would be a lot easier :)

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On Sep 21, 2020, 10:54 PM -0400, Haoran Zhao <zhaoha...@gmail.com>, wrote:

Hi everyone,

I'm trying to communicate the NI IC-3173 with a Linux PC (ROS master). Because the NI IC-3173 is connected and controlled by a windows PC, so I plugged the Ethernet cable into windows PC. 

The IP address of Linux PC: 192.168.1.3

The IP address of Windows PC: 192.168.1.5

The IP address of IC-3173: 169.25.47.89

Similar to the subscriber example program in  ROSExaemples, I made a simple program to subscribe 'geometry_msgs/Point' message. 

if I put the ROS Connection.vi under My computer, it can subscribe the message, but it's not in real-time. the latency is about 5~10s.

if I put the ROS Connection.vi under NI IC-3173, it can NOT subscribe the message, and keep asking the master IP. 

I have tried to change my IP, TCP wait time, queue size in "_ ROSDefinition.vi", but the problem is still not solved.

So my question is:

1. How to make it work under NI IC-3173? 

2. How to make is subscribe message in real time?

Thanks so much for your help,

Haoran

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[Haoran Zhao]

Hi Chris, 

Thanks so much for getting back to me. it's great to know that approach.

so do I need to install any add-Ons for that? can I use rospy in Python node or I exchange data by socket?

Thanks, 

Haoran

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[Chris Rogers]

I don’t know - I have not tried yet - but please share what you find out :)

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200 College Ave, Medford, MA  02155. ph: 617 627 2882  c: doodle.com/mm/chrisrogers/book. Z: tufts.zoom.us/my/crogers

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