mneumann's profile - activity

Hello!

I am using RosLibJs for a web GUI that shows robot data like position, battery status, map etc.

Unfortunately, it uses a lot of network traffic (around 20 GBytes per day!). I am thinking this is due to the direct subscriptions to topics and the high frequency the robot emits data on those topics (like at 10 Hz, for example).

Now, I am unsure how to solve this problem. I thought of 2 possible solutions, maybe you people can help me with it:

1. Create specialized nodes that only publish data when needed and not in the frequency the robot requires it internally,
2. Request data periodically from JS side and offer a service from ROS side.

Do you have other ideas? Is there maybe a simpler way?

Thank you!

This sounds like a great solution. I will try it and let you know!

Extremely large network traffic using RosLibJs - possible solutions Hello! I am using RosLibJs for a web GUI that shows

We solved the problem. By moving code from Linux to Windows, our SVN (or the OS itself, not sure) changed something in t

Yes, I will post this as an answer. They were solutions in the sense that we fixed the CMakeLists.txt we broke by shifti

rosbridge can't locate node, possibly due to "symlink issue" in rosbridge_server Second edit: Problem solved. We pushed

rosbridge can't locate node, possibly due to "symlink issue" in rosbridge_server Edited; See at the bottom for the new e

rosbridge can't locate node, possibly due to "symlink issue" in rosbridge_server Edited; See at the bottom for the new e

rosbridge can't locate node, possibly due to "symlink issue" in rosbridge_server This issue occured out of the blue afte

Yes, I have multiple services I tried to call, all in the same cac package. I tried both /cac/GetMapInfo as well as /cac

ROSbridge: "Service does not exist" I am trying to call the service /cac/GetMapInfo in a stage simulator from ROSbridge

ROSbridge: "Service does not exist" I am trying to call the service /cac/getMapInfo in a stage simulator from ROSbridge

Yes, I have multiple services I tried to call, all in the same cac package. I tried both /cac/GetMapInfo as well as /cac

ROSbridge: "Service does not exist" I am trying to call the service /cac/getMapInfo in a stage simulator from ROSbridge

thanks! this is exactly what i meant!

I have a service node server that handles a simple request by a client. The client sends an id (as a string), which the server then should read out. I am using rospy.

If I print the message in the server, it says "request: 1". I want to only extract the "1". How do I do that?

Rephrasing a bit: what "member" of the message do I have to call to get the raw data? Something like message.data.

Here's the handler:

def handle_cac(request):
    # receive goal id, return goal information
    print("Received this message: ")
    print request.data # this does not work! I'd like to just get the raw id, e.g. "1"
    for goals in root.getchildren():
        for goal in goals.getchildren():
            print goal.tag
            print goal.attrib
            if goal.attrib.text == request.data:
                print "Found goal: " + goal.name
                # print((root.findall("goals"))[0][0].attribute)
               return "nothing"

And here's the client:

def cac_client(request_message):
    print "Running request"
    rospy.wait_for_service('CAC')
    try:
        GetGoal = rospy.ServiceProxy('CAC', cac)
        resp1 = GetGoal(request_message)
        print resp1
        return resp1
    except rospy.ServiceException, e:
        print "Service call failed: %s" %e

if __name__ == "__main__":
    cac_client("1")

How do I access the raw string I sent via these messages?

Sorry, I was not sure what you meant. This is what it looks like: string request \--- string response. Ignore the \, did

Sorry, I was not sure what you meant. This is what it looks like: string request \--- string response. Ignore the \, did

Sorry, I was not sure what you meant. This is what it looks like: `string request string response`

Sorry, I was not sure what you meant. This is what it looks like: string request \--- string response

Sorry, I was not sure what you meant. This is what it looks like: `string request string response`

Sorry, I was not sure what you meant. This is what it looks like: `string request string response`

Get service message data I have a service node server that handles a simple request by a client. The client sends an id

I added the client's code to the question.

Get service message data I have a service node server that handles a simple request by a client. The client sends an id

Get service message data I have a service node server that handles a simple request by a client. The client sends an id

Get service message data I have a service node server that handles a simple request by a client. The client sends an id