rosbridge | ROS node for connecting JavaScript applications | Runtime Evironment library
kandi X-RAY | rosbridge Summary
kandi X-RAY | rosbridge Summary
This is a very modified version of rosbridge from brown_remotelab. See the wiki for documentation.
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Top functions reviewed by kandi - BETA
- Process request
- The client handshake
- Render the WebSocket header
- Check the client handshake
- Process the web socket
- Write a frame to the client
- Attach a new handler
- Called when the connection is received
- Called when the connection is established
- Process data received from the server
- Called when a frame is received
- Called when the connection length is exceeded
- Close the underlying transport
- Called when a connection lost
- Called when a connection is lost
- Write a sequence of frames to the client
rosbridge Key Features
rosbridge Examples and Code Snippets
Community Discussions
Trending Discussions on rosbridge
QUESTION
I'm trying to connect to a Ros WebSocket service at ws://local host:9090 (runned with rosbridge) from my flutter application, but i'm getting the following error in Flutter:
...Bad state: Insecure HTTP is not allowed by platform: http://local host:9090
ANSWER
Answered 2021-Apr-23 at 22:25Open the AndroidManifest.xml file in the android/app/src/main folder.
Then set usesCleartextTraffic to true.
QUESTION
I am trying to get some ros packages in docker. I have a command like:
...ANSWER
Answered 2021-Mar-08 at 01:47Although I still do not know the cause of this, it can be solved by using the following install command:
QUESTION
I have created a simple HTML page to control the movement of a simulated Gazebo Turtlebot using roslaunch rosbridge_server rosbridge_websocket.launch following this tutorial.
However, in the Web Console of the HTML page (F12) it shows the error "Firefox cant establish a connection to the server at ws://localhost:9090/." I am using the default rosbridge for the websocket(9090). In the Terminal I am also receiving the errors:
[-] failing WebSocket opening handshake ('WebSocket connection denied: origin 'null' not allowed')
[-] dropping connection to peer tcp4:127.0.0.1:41290 with abort=False: WebSocket connection denied: origin 'null' not allowed.
Does anyone have any suggestions on how I can fix this?
...ANSWER
Answered 2020-Apr-02 at 09:34Given that you have followed the ROS tutorial and have created an HTML file as shown in Ros Bridge tutorial then you have to run:
runcorerosrun rospy_tutorials add_two_ints_serverroslaunch rosbridge_server rosbridge_websocket.launch
Now that you have these up and running, you need to serve the html/javascript file (e.g. simple.html) and start the services etc. For example, you can serve the simple.html by using a SimpleHTTPServer, see below an example (e.g. simplehttpserver_test.py):
QUESTION
I'm new to android. How do you fill a spinner from the server's data dynamically.
So I'm trying to populate data from the server to my spinner. my JSON is
...ANSWER
Answered 2019-Sep-25 at 02:04you first need to deserialize the data and map to model class and then set the model list to spinner adapter. Check retrofit to request and parse your Jason response.
QUESTION
So i am developing a controller in my mobile app using java and currently whenever i touch the button it will send 3 data in a row. when it should only be sending one data and another data when the button is release
i am able to set get the data when the button is release but not accurate since a lot of data was delivered
...ANSWER
Answered 2019-Sep-05 at 06:37The issue is that you are publishing, regardless of the type of event.
You publish at least once when the touch starts, at least once when the touch ends and again for movement. Haven't checked, but it may also just keep firing if you hold the button.
Move Publish into the ACTION_DOWN block
QUESTION
The aim is for my shape (ie. 'tracker') to emulate the movement of my robot. I have two files for this, one with the rosbridge code to pull the topics from the robot:
...ANSWER
Answered 2019-Jul-29 at 16:46Just to be clear, for the line which you note the error occurs, don't you mean to use the position argument you pass in? I'm assuming OdomPosition is not a variable in the scope outside of track()?
QUESTION
I have a C++ ROS node using ROSBridge to send the ROS Topics as JSON strings via TCP WebSocket over port 9090. On the same computer, I have a C# Unity program that needs to access the JSON and send some of its own. If I put this program on a different computer there is no problem--I can access port 9090 and see the JSON. But if it is on the same computer as the ROSBridge Host, then there is a conflict with using the same port. So the two applications cannot communicate with each other on the same PC but they can on separate PCs.
So what can I do? Must the ports match and thus always conflict or maybe I can somehow make Process A send on 9090 but receive on 9091 and Process B just the opposite or something? Any other options? In essence, I'm trying to get Unity to participate in the ROS communications, but it does not have native support for that and thus the workaround with the ROSBridge JSON strings.
...ANSWER
Answered 2019-Jan-15 at 14:42According to http://wiki.ros.org/rosbridge_suite/Tutorials/RunningRosbridge you can set the port that Rosbridge talks on in the .launch file.
If you are using the example rosbridge_websocket.launch file, the second line of the file includes a port number in the form of .
You can change 9090 to change the default port it uses.
According to the roslaunch documentation at http://wiki.ros.org/roslaunch/Commandline%20Tools you can also pass arguments to roslaunch on the command line:
The rosbridge_websocket.launch file sets the port from the argument "port", so if you run roslaunch like this it will use port 8080:
roslaunch rosbridge_server rosbridge_websocket.launch port:=8080
You can see the full rosbridge_websocket.launch file at https://github.com/RobotWebTools/rosbridge_suite/blob/develop/rosbridge_server/launch/rosbridge_websocket.launch
Looking over that file for the line is how I know that it uses the "port" argument to set the port.
If you post your .launch files I can give your more advice on how to edit them if this answer is not clear.
QUESTION
I'm trying to test my consumers with the testing framework from django channels, but even a basic test doesn't seem to work
This is what my test case looks like:
...ANSWER
Answered 2018-Nov-19 at 09:58You are calling send_and_consume with two positional arguments which results in effect in this call (which is exactly why there happens an error during execution in this line):
QUESTION
My company is interested in using a stand-alone Service Fabric cluster to manage communications with robots. In our scenario, each robot would host its own rosbridge server, and our Service Fabric application would maintain WebSocket clients to each robot. I envision a stateful service partitioned along device ids which opens connections on startup. It should monitor connection health via heartbeats, pass messages from the robots to some protocol gateway service, and listen to other services for messages to pass to the robots.
I have not seen discussion of this style of external communications in the Service Fabric documentation - I cannot tell if this is because:
- There are no special considerations for managing WebSockets (or any two-way network protocol) this way from Service Fabric. I've seen no discussion of restrictions and see no reason, conceptually, why I can't do this. I originally thought replication would be problematic (duplicate messages?), but since only one replica can be primary at any time this appears to be a non-issue.
- Service Fabric is not well-suited to bi-directional communication with external devices
I would appreciate some guidance on whether this architecture is feasible. If not, discussion on why it won't work will be helpful. General discussion of limitations around bi-directional communication between Service Fabric services and external devices is welcome. I would prefer if we could keep discussion to stand-alone clusters - we have no plans to use Azure services at this time.
...ANSWER
Answered 2018-Jul-16 at 07:21I hope I understood everything right.
About the obstacles:
I think the major issue here is that bi-directional connection can be established between service replica and the robot.
This has two major problems:
- Only primary replica has write access - i.e. only one replica would be able to modify state. This issue hence could be mitigated by creating a separate partition for each robot (but please remember that you can't change partition count after the service was created) or by creating a separate service instance for each robot (this would allow you to dynamically add or remove robots but would require additional logic related to service discoverability).
- The replica can be shutdown (terminated), moved to another node (shutdown and start of new replica) or even demoted (the primary replica get's demoted to secondary and another secondary replica get's promoted to primary) by various reasons. So the service code and robot communication code should be able to handle this.
About WebSockets
This looks possible by implementing custom ICommunicationListener and other things using WebSockets.
QUESTION
I'm trying to patch a function call with a custom mock I wrote
...ANSWER
Answered 2017-Jun-07 at 21:09Instead of the above mock, you have to write a Mock calling the instantiation within the side effect
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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No vulnerabilities reported
Install rosbridge
You can use rosbridge like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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