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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of Communication
Communication Key Features
Communication Examples and Code Snippets
def __init__(self,
bytes_per_pack=0,
timeout_seconds=None,
implementation=CommunicationImplementation.AUTO):
if bytes_per_pack < 0:
raise ValueError(
f"Argument `bytes_per_pack` must
private void handleCommunication(SSLSocket socket, String usedTLSProcess) throws IOException {
logger.debug("Enabled TLS v1.2 on " + usedTLSProcess);
try (PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(soc
@Override
protected void configure() {
try {
bind(Communication.class).toConstructor(Communication.class.getConstructor(Boolean.class));
bind(Boolean.class).toInstance(true);
} catch (NoSuchMethodException
Community Discussions
Trending Discussions on Communication
QUESTION
This is the code I have written for the MPI's Group Communication Primitives-Brod cast example using c language try with Ubuntu system. I wrote a code for the string and variable concatenation here.
When I am compiling this code it shows error like that.(Please refer the image)
Can anyone help me to solve this?
...ANSWER
Answered 2021-Jun-15 at 12:43Change this line :
QUESTION
I am running Node-RED on Docker, and I am trying to write data to MySQL on my localhost.
As host, I am using localhost (see picture)
I receive the error: connection refused
.
Which Host address should I use here? I don't quite understand the communication between the container and the local host.
...ANSWER
Answered 2021-Jun-15 at 09:48localhost
always points to the TCP/IP stack that the program opening the connection is bound to.
Every Docker container has it's own TCP/IP stack so unless the database is running in the same container as Node-RED localhost
will not be the correct hostname for the database.
You have 3 choices
- If you are using docker-compose then you can use the container name as the hostname and it will connect to the right container.
- You can use the
docker inspect [container-instance-name]
to find the IP address assigned to the database container and use that - If you have mapped the container port to your host machine (with the
-p
option) then you can use the IP address of the host which normally defaults to172.17.0.1
Edit:
To connect to the host machine then you can use host.docker.internal
on Docker for Windows and Docker for Mac (unfortunately the issue to fix this on Linux has been open for over 3 years).
You should also be able to use the IP address from point 3 above.
QUESTION
I am trying to deploy 2 containers on 2 different tasks (1 container per task), one is my frontend and the other is my backend server. I am trying to figure out how to configure the communication between them.
I saw that a load balancer in a service is a good option. However, should I configure load balancer for my front end server and another one for my backend? Meaning each time I have public-facing services and private services I need 2 load balancers?
I would like to only expose my front-end to the public internet and my backend will remain private (although I make API requests to the outside world - probably need to configure outbound route too?).
I would highly appreciate any information.
...ANSWER
Answered 2021-Jun-15 at 09:03No you don't need a private LB for that. It is an option you can use but ECS has since introduced the concept of Service Discovery for back-end services. The idea is that your front end is exposed to your users via a standard LB (e.g. ALB) but services that are being called by the front end and that run behind the scene can be addressed using this service discovery mechanism (based on Route53/CloudMap).
You can see an example of this concept here. This CFN template gives you the details re how you can build this layout.
QUESTION
i am currently building a Client to communicate with a Gateway of a Charge Point.
The communication is build with OcppV1.5 over Soap & Http.
The Server doesn't accept my request. I get a Http Response 500 with the Error Reason:
"XML Request is not well formed, Action does not exist."
I looked into the wsdl files but I just don't understand why it doesn't accept my action.
My Request looks something like this:
...ANSWER
Answered 2021-Jun-13 at 09:11It's hard to tell from what you posted why you are getting an error, so I can only add some information that can hopefully allow you to troubleshoot the issue.
Your message has WS-Addressing headers, being one of them. The value of this field should be specified in the WSDL if your WSDL also includes WS-Addressing Metadata information, or should be specified in the documentation of the web service you are invoking. Your error message "XML Request is not well formed, Action does not exist" seems to indicate that there might be an issue with this field, but there is another action that SOAP services have which is a SOAP action. I asked about it in the comment above to make sure it's eliminated as a source of problems. In SOAP 1.1 it's called
SOAPAction
and is a separate HTTP header, while in SOAP 1.2 it's an action
parameter on the HTTP Content-Type
header. Based on the http://www.w3.org/2003/05/soap-envelope
namespace, you have a SOAP 1.2 message.
With these explanations layed out, I suggest you take the WSDL and feed it to SoapUI who can generate sample requests that you can use to invoke the web service. If the WSDL also contains WS-Addressing Metadata, SoapUI should be able to pick it up and help you fill in the values you need. If not, look again through the WSDL for Action
elements (make sure you differentiate between the SOAP Action and the WS-Addressing Action using their XML namespaces) or through the service documentation.
Once you get a succesfull call using SoapUI, then try to duplicate it with your code. At that point you can again use SoapUI to troubleshoot things and inspect your code built message to see it resembles the one you can successfully send with SoapUI.
Hope this helps get you closer to a resolution.
QUESTION
The client wants all communication with the database to be done through stored procedures. To do this in ASP I am using FromSqlRaw like so:
...ANSWER
Answered 2021-Jun-09 at 15:34You could alternatively use:
QUESTION
I have an OpenID Connect server (OpenIDdict) and an asp.net core webapp in containers behind a TLS termination proxy. In production, all communication between the webapp and the OIDC server can go through the 'outside', based on their public names. However, in development, I'm using self signed certificates that aren't trusted by the containers running the apps, only by my host pc. Because of that, in development, the webapp can redirect the browser to the OIDC server just fine, but when it, for instance, needs to call the token endpoint, it will fail, because the certificate isn't trusted.
A possible solution would be to have the server to server communication go through the internal container network, but I haven't been able to get that to work. Is there a way to make the asp.net core OpenID Connect middleware use a different url (and protocol) for server to server communication?
Another solution would be to install the self signed certificates in the containers, but because that's only needed in development, it seems bad practice to burden the images with that. Is that assessment correct?
I'm hoping I'm missing the most obvious solution. Any ideas?
...ANSWER
Answered 2021-Jun-14 at 12:33This is what I ended up doing:
- I added a custom domain to the hosts file of my pc, pointing to itself.
- Using openssl, I created a rootDevCA.crt and added it to the trusted root on my pc and in all the container images.
- With that root certificate, I signed a new certificate for the custom domain and supplied that (including its key) to the proxy.
As long as I keep the key file for the root certificate far away from my source code, there should be no security issues.
QUESTION
I came across a org.hibernate.LazyInitializationException
which the cause is very well explained in this question. My code has, I think, the same problem as in the question referenced in the link. Here's the code:
Contract class:
...ANSWER
Answered 2021-Jun-14 at 11:51This is happening because there is no Transaction opened in DTO(object become detached). Wherever you have fetched the object from the DB call contractFile.getContract()
so that the ORM framework loads the lazy-loaded object.
QUESTION
While Google composer private environment creation in service project, I am trying to use subnet from host project. I have given editor role to composer service account as well as to composer APIs service agent account to fix permission issues. Still I am getting below error. Is it firewall issue? What firewall settings we need here?
Environment couldn't be created, but no error was surfaced.
...ANSWER
Answered 2021-Jun-14 at 05:38I was able to solve this with below resolution:
Provided 'host network user' permissions in Host Project to Google APIs Service Agent account (serviceAccount:@cloudservices.gserviceaccount.com) specific to host project network shared with service project (role = "roles/compute.networkUser")
QUESTION
How SSL works is well know as it's quite widely used and described well every where. In short - SSL involves
- Verifying server authenticity by client by verifying the servers X.509 certificate.
- Then arriving at a symmetric key using diffie-hellman key exchange algorithm.
But I am not sure what happens withsecurity.protocol=SASL_SSL
. Clients and Server communication of few technologies like Kafka etc rely on this security protocol as one of the option. Here I am worried about the point 1 above. If i get a wrong broker address (as a trick ) from some one, does SASL_SSL verify the server certificate or not is my question. If it does, then I can be sure that the received broker is not genuine and my application will not publish or subscribe to messages from this server and my data is safe.
Edit 1: Following @steffen-ullrich answer and comments And little more dig, i see below. Looks like the certificate validation is happening when used through chrome and probably its loaded in the cacerts
too. So the java code is able to authenticate the server.. so seems ok..
Edit 2: Right the certificates DST and ISRG are preloaded in the JDK 11 cacerts, so the client is able to authenticate the server as commented by Stephen.
...ANSWER
Answered 2021-Jun-13 at 02:57What you are asking is related to another configuration please read the following description.
ssl.endpoint.identification.algorithm The endpoint identification algorithm used by clients to validate server host name. The default value is https. Clients including client connections created by the broker for inter-broker communication verify that the broker host name matches the host name in the broker’s certificate. Disable server host name verification by setting ssl.endpoint.identification.algorithm to an empty string. Type: string Default: https Importance: medium
QUESTION
I started several attempts to get this complex working. As mentioned in so many other discussions the micropython modules are not recognized, e.g. machine. Python modules like numpy were also not found.
I think, the python environment is not working correctly and the modules are there but not found. But, there is no recommendation or tutorial that really solves this. How can I set this up?
What I did so far:
manually installed all components according to tutorials
another way: installed the pything coding pack which contains a lot of stuff.
The Windows paths have the correct folder paths to the components.
I set the obviously correct python interpreter in vscode
connection/communication with board is working. I can set up codes which dont contain micropython modules.
in other IDE's like thonny/mu the modules are found.
I also installed a python venv: I could install numpy inside this venv and later it was found in vscode (wasn't found before) when I used the venv python as interpreter in vscode. But I wasn't succesful with micropython in venv.
PS: I can use the micropython modules like machine or network and upload the sketch to the esp32 board. It is working on the board. But I cant run any of the sketches in vscode. I think that Vscode uses cpython instead of micropython but shouldn't this be working after the installations I mentioned?
...ANSWER
Answered 2021-May-24 at 00:00It sounds like you're confusing modules you install on the machine running Visual Studio Code and modules you install in Micropython on the ESP32.
They're totally separate.
Python on your Windows machine can use venv.
MicroPython doesn't use venv at all (there apparently is a clone of venv for MicroPython but it's not readily apparent what it does or why or how you'd use it). It is a completely separate instance of Python from the one on your Windows machine, and it doesn't operate the same way. Modules you install under venv won't be visible or usable by MicroPython. Numpy in particular is not available for MicroPython.
Many modules need to be written specially to work with MicroPython. MicroPython isn't running in a powerful operating system like Windows, MacOS or Linux. It's running in a highly constrained environment that lacks much of the functionality of those operating systems, and that has extremely little memory and storage compared to them. You can't expect that a module written for regular Python will just work on MicroPython (and likewise, many MicroPython modules use hardware features like I2C or SPI access that may not be available on more powerful, general purpose computers).
Only modules available with upip
will be available for MicroPython. They'll need to be installed in the instance of MicroPython running on the ESP32, not in the instance of Python running under Windows. They're two, totally separate instances of Python.
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