californium | CoAP/DTLS Java Implementation

 by   eclipse Java Version: 3.4.0 License: Non-SPDX

kandi X-RAY | californium Summary

kandi X-RAY | californium Summary

californium is a Java library typically used in Embedded System, Eclipse applications. californium has no bugs, it has no vulnerabilities, it has build file available and it has high support. However californium has a Non-SPDX License. You can download it from GitHub, Maven.

Eclipse Californium is a Java implementation of RFC7252 - Constrained Application Protocol for IoT Cloud services. Thus, the focus is on scalability and usability instead of resource-efficiency like for embedded devices. Yet Californium is also suitable for embedded JVMs. More information can be found at and
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            kandi-support Support

              californium has a highly active ecosystem.
              It has 602 star(s) with 337 fork(s). There are 50 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 16 open issues and 649 have been closed. On average issues are closed in 98 days. There are 2 open pull requests and 0 closed requests.
              It has a positive sentiment in the developer community.
              The latest version of californium is 3.4.0

            kandi-Quality Quality

              californium has 0 bugs and 0 code smells.

            kandi-Security Security

              californium has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              californium code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              californium has a Non-SPDX License.
              Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

            kandi-Reuse Reuse

              californium releases are available to install and integrate.
              Deployable package is available in Maven.
              Build file is available. You can build the component from source.
              Installation instructions, examples and code snippets are available.
              californium saves you 100451 person hours of effort in developing the same functionality from scratch.
              It has 108420 lines of code, 8193 functions and 907 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed californium and discovered the below as its top functions. This is intended to give you an instant insight into californium implemented functionality, and help decide if they suit your requirements.
            • Command entry point
            • Reassign the local addresses to all local ports
            • Parse an argument
            • Stops the NAT
            • Initialize the raw properties
            • Get a trimmed string property
            • Initialize maps from raw key
            • Initialize HTTP method
            • Process incoming request
            • Invoked when a response is received
            • Handles an outgoing request
            • Start a CoAP client
            • Starts the benchmark
            • Main entry point
            • Sends a request to the destination
            • Returns a string representation of this credential
            • Sends a request
            • Handles a duplicate request
            • Read the endpoints
            • Send a response to the peer
            • Main executor
            • Returns the co - request
            • Handles a response
            • Handle the incoming request
            • Demonstrates how to send a client
            • Handle timeout event
            Get all kandi verified functions for this library.

            californium Key Features

            No Key Features are available at this moment for californium.

            californium Examples and Code Snippets

            Is it possible to use arrow functions in react props?
            Lines of Code : 22dot img1License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            
            class Child extends Component {
              render() {
                console.log(this.props.myFunc);
                return <>;
              }
            }
            
            class Parent extends Component {
              list = [
                { btn: {...someProps}},
                { btn: {...someProps} },
                { btn: {...someProps} },
            How to tidying my Java code because it has too many looping
            Javadot img2Lines of Code : 110dot img2License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            
            //Test class
            public class Test {
                public static void main(String[] args) {
                    Node root = new Node(1, "test1", new Node[]{
                            new Node(2, "test2", new Node[]{
                                    new Node(5, "test6", new Node[]{})
            How to output every combination of values in 2 columns, in groups? - SQL
            Lines of Code : 17dot img3License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            SELECT  p.group_id, p.parent, c.child
            FROM   ( 
                       SELECT group_id, parent
                       FROM   YourTable
                       GROUP BY group_id, parent
                   ) 
                   p CROSS JOIN 
                   (
                       SELECT group_id, child
                       FROM  
            convert StreamBuilder to StreamProvider
            Lines of Code : 71dot img4License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            dependencies:
              flutter:
                sdk: flutter
              provider: ^6.0.2
            
            import 'package:flutter/material.dart';
            import 'package:provider/provider.dart';
            
            void main() {
              runApp(
                const MyApp());
            }
            
            class MyApp extends StatelessWidget {
              const My
            How to make colored buttons tkinter
            Lines of Code : 15dot img5License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            from tkinter import *
            
            # Define the Window
            root = Tk()
            # Add a Title to The Window
            root.title('Colored Button')
            # Geometry of window; width by length in pixels
            root.geometry('300x200')
            # Define the Button; fg is the foreground, bg is the b
            Get parent id from level with Oracle SQL
            Lines of Code : 63dot img6License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            select *
            from   t
            MATCH_RECOGNIZE (
              ORDER BY id DESC
              MEASURES
                child.id   AS id,
                child.name AS name,
                child.lvl  AS lvl,
                parent.id  AS parent_id
              ONE ROW PER MATCH
              AFTER MATCH SKIP TO NEXT ROW
              PATTERN (child ancestor
            Best suited data structure for prefix matching search
            Lines of Code : 130dot img7License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            class TrieNode {
                constructor(data=null) {
                    this.children = {}; // Dictionary, 
                    this.data = data; // Non-null when this node represents the end of a valid word
                }
                addWord(word, data) {
                    let node = this; // t
            CustomPaint Erase shape on hit with fade effect
            Lines of Code : 101dot img8License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            import 'package:flutter/material.dart';
            
            void main() {
              runApp(const MyApp());
            }
            
            class MyApp extends StatelessWidget {
              const MyApp({Key? key}) : super(key: key);
            
              // This widget is the root of your application.
              @override
              Widget b
            Artifactory Docker Image in ECS Fargate has bad permissions
            Lines of Code : 26dot img9License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            ubuntu@ip-10-0-1-29:/mnt/efs/fs1$ ls -la
            total 40
            drwxr-xr-x 10 root root 6144 Apr  6 21:40 .
            drwxr-xr-x  3 root root 4096 Apr  5 07:40 ..
            drwxr-xr-x  2 1030 1030 6144 Apr  6 21:40 artifactory
            drwxr-xr-x  9 1030 1030 6144 Apr  5 07:26 back
            How to chain animation and non-animation functions in Flutter?
            Lines of Code : 286dot img10License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
                shuffle.onPressed() {
                  disable user input;
                  iterate over the grid {
                    if (cell contains a text value) {
                      push Text widget key onto a stack (List);
                      trigger the hide animation (pass callback #1);
                  

            Community Discussions

            QUESTION

            How can I set a CoAP post request Body with a requestparameter and a File?
            Asked 2021-Apr-21 at 15:23

            I want to upload a file from a CoAP client by using the californium standard forwarded proxy to a server which supports http-communication.

            Is there an alternative with CoAP to build a post Request with a name of the RequestParameter and a payload contents the Value of file?

            ...

            ANSWER

            Answered 2021-Apr-15 at 05:49

            CoAP (and so Californium) focus on efficiency for small payloads. POST files will not be the domain of CoAP at all. If you really want that, just load the payload from the file and POST that. Ensure, you configured the MAX_RESOURCE_BODY_SIZE in Californium.properties according your requirements. If you use Californium on both sides, both need to be configured. Alternatively, you may disable the "transparent blockwise" using a 0 MAX_RESOURCE_BODY_SIZE. That will then require, that you handle the single blocks and block-option on your own.

            Source https://stackoverflow.com/questions/67101071

            QUESTION

            Query related to Connection Id exchange between DTLS Client & Server using Californium Scandium core
            Asked 2021-Feb-17 at 13:16

            I am exploring on DTLS 1.2 using Californium-Scandium demo-apps projects. It appears that Scandium-core README.md supports the latest draft of Connection Identifiers for DTLS 1.2. According to Connection Identifiers for DTLS 1.2, the CID exchange happens between the Client & the server if client and server wants to talk on based of Connection Id. When I run the demo-apps of Scandium Server & Scandium Client, I am not able to see the exchange of CID happening between the client and the server. Though I can see the Connection Id generation on Client as well Server side of DTLS. I have added the logger in the Record.java but the connection Id is always null in the loggers. My question is whether the CID exchange logic between the DTLS Server and DTLS client is implemented in scandium-core API? If yes, please help me to find out the classes used for this.

            ...

            ANSWER

            Answered 2021-Feb-17 at 13:16

            For version 2.6.0, neither the ExampleDTLSClient nor the ExampleDTLSServer comes "out of the box" with CID enabled (but I will change that for 3.0 :-) ).

            If you want to see that "out of the box" use the "cf-secure" demo. Start the client with "CID:0" for "support CID", and the server with "CID:6" to use a 6 bytes CID.

            To enable CID for ExampleDTLSClient and ExampleDTLSServer, add to the DtlsConfigurationBuilder a

            Source https://stackoverflow.com/questions/66241448

            QUESTION

            Eclipse Leshan LwM2M Build Failure
            Asked 2020-Nov-12 at 14:46

            I am currently getting myself into the LwM2M topic and I tried the leshan project from eclipse. I followed the README.md on https://github.com/eclipse/leshan. The standalone demos are working fine, but when I try to build the project with "mvn clean install" I get the following log/error:

            ...

            ANSWER

            Answered 2020-Nov-12 at 14:46

            I continued researching on my own and Java 15 is the problem. If anyone has the same problem as i had just switch to Java 11 and run the build as described. It worked fine for me. If you have any other problems I suggest that you also post your questions, concerning leshan lwm2m, on https://github.com/eclipse/leshan/issues.

            Jonas

            EDIT: You can also do it with Java 15. You have to change the pom.xml document. Change in line 456 the version from 4.0.0 to 5.1.1 .

            Source https://stackoverflow.com/questions/64787832

            QUESTION

            Using numpy logical 'and' for different broadcasting
            Asked 2020-Oct-16 at 15:26

            I wanted to return the name of elements based on two conditions; even protons number and odd neutrons number. I've tried to print both tests and it turns out well. However, when I try to print the elements using 'and' logical, an error has occurred due to different broadcasting. I can't figure out how do I reshape it. Help me out.

            The elements, protons and neutrons.

            I've already converted elements, protons and neutrons into arrays.

            The input;

            ...

            ANSWER

            Answered 2020-Oct-16 at 15:26

            Apply the & to the boolean tests, before indexing:

            Source https://stackoverflow.com/questions/64391283

            QUESTION

            Is it possible to put in a atoomnumber and out a atoomname in javascript?
            Asked 2020-Feb-28 at 16:55

            Here is the code i already attempted but it didnt work out:

            This code is made by a 14 year old boy (me) so dont worry about the maintenance.

            HTML:

            ...

            ANSWER

            Answered 2020-Feb-28 at 16:55

            I made a plunker with a working solution: https://plnkr.co/edit/QyAglTqoVx8k5RhZbenV?p=preview

            Yeah, it needs put NaamOfAtoom(AtoomNum) inside that berekenen() function to fill that Atoomnaam variable, and change the switch.

            Basically, when you did that switch, the cases are numbers, but AtoomNum is a string (you can type letter also), so it didn't entered any case options. So was equivalent to 12 === '12' returning false. switch is strict comparing === instead of only ==.

            Adding a parseInt(number) solved switch part.

            Source https://stackoverflow.com/questions/60455202

            QUESTION

            unable to destructure variable in react
            Asked 2019-Oct-02 at 15:57

            I am new in react I am fetching my JSON which is

            ...

            ANSWER

            Answered 2019-Oct-02 at 15:56

            Use an alias for the properties that have a dash - :

            atomic-number is not a valid variable name in javascript.

            Source https://stackoverflow.com/questions/58205071

            QUESTION

            Create a lazy Stream from a Flux
            Asked 2019-Aug-02 at 16:40

            I'm trying to create a lazy-Stream with Project Reactor in Californium-SR10.

            According to the javadoc:

            Transform this Flux into a lazy Iterable blocking on Iterator.next() calls.

            Consequently, I have tried the following:

            ...

            ANSWER

            Answered 2019-Aug-02 at 16:40
            Why is every parameter passed to doOnRequest() 2?

            doOnRequest() will fire whenever the subscriber requests new elements from upstream (along with the number of elements requested as its parameter.) Since you've limited the rate to 2, you'd expect this to be called with 2 as a parameter every time, which it's doing.

            Why does the Flux not complete lazily?

            Well, actually it does, but not how you expect it to. Lazy doesn't necessarily mean "one at a time", it just means it will evaluate batches as they're called for, rather than always evaluating the whole Flux in one go.

            Specifically, note that the limitRate() method doesn't apply automatically to the iterator in the same way - it has a separate batch size that you have to specify as a parameter to the toIterable() method.

            You can specify a prefetch rate and a batch size of 1, and then you're likely to only get 4 elements generated (rather than 3, as it'll always have at least one additional element ready for the following next() call):

            Source https://stackoverflow.com/questions/57329541

            QUESTION

            reactor-netty: using keep-alive HTTP client
            Asked 2019-May-05 at 00:03

            I use reactor-netty to request a set of URLs. Majority of URLs belong to the same hosts. reactor-netty seems to make a brand new TCP connection for every URL even if connection to the host is already established for the previous URL. Some servers drop new connections or start to respond slowly when hundreds of simultaneous connections established.

            Sample of the code:

            ...

            ANSWER

            Answered 2019-May-05 at 00:03

            Yes, reactor netty supports keep-alive, connection reuse, and connection pooling.

            Note that .flatMap is a async operation that processes the inner streams in parallel. Therefore, when you call group.flatMap(... the inner requests will be executed in parallel. And since they are executed in parallel, multiple connections will need to be established.

            If you want to execute requests to the same host sequentially, change your example to use group.concatMap instead of .flatMap.

            If you want to still execute them in parallel, but limit the number of active requests to an individual host, then change your example to use one of the overloaded versions of .flatMap that takes a concurrency parameter.

            Also, since you are using HttpClient.create(), your example uses the default global http connection pool. If you want more control over connection pooling, you can specify a different ConnectionProvider via HttpClient.create(ConnectionProvider).

            Source https://stackoverflow.com/questions/55899414

            QUESTION

            C - Serialisation of struct into char* changes original data
            Asked 2018-Dec-09 at 01:00

            Following this question, I decided to serialise some data I need to send over a TCP/IP connection.

            The data is pretty simple :

            ...

            ANSWER

            Answered 2018-Dec-09 at 01:00

            You have char** packet which is a pointer to a pointer to some chars.

            You then treat that as int * which is a pointer to some ints.

            You then overwrite the first int - so you're writing into 'dest' itself and not what it points to. And since you write more after that, you're corrupting the stack.

            Source https://stackoverflow.com/questions/53688450

            QUESTION

            How to read from a file into a dynamically allocated linked list of pointers to struct?
            Asked 2018-May-09 at 06:25

            So I've been working on this program for a while and I have gotten it to a point where it compiles just fine but when I run it I get a Segmentation Fault. I've backtraced the fault via gdb to the function below but cannot for the life of me see where the problem is, and I am not versed enough with gdb to determine any more details on the origin of the fault. Like the question says I'm trying to read from a file into a dynamically allocated linked list where each node of the list has a pointer to a struct called Element. Then I need to convert that linked list to an array of pointers to struct Element. I hope that a fresh pair of eyes can see some mistake I've made that I have been blind to.

            UPDATE: Added rest of source files. Added gdb backtrace snippet.

            Element.h

            ...

            ANSWER

            Answered 2018-May-09 at 06:25

            The good news is you were really, really close. The bad news is the "really really close" part -- it only takes one subtle error to torpedo your code.

            First the general discussion. While there is nothing wrong with using a pointer-to-pointer-to-Element, you are missing the benefits of using C++ and the automatic memory handling offered by . That said, it is good to know how to handle both.

            Your error is:

            Source https://stackoverflow.com/questions/50245215

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install californium

            You need to have a working maven installation to build Californium. Then simply run the following from the project's root directory:. Executable JARs of the examples with all dependencies can be found in the demo-apps/run folder. The build-process in branch master is tested for jdk 7, jdk 8, jdk 11, jdk 15, jdk 16 and jdk 17. For jdk 7 the revapi maven-plugin is disabled, it requires at least java 8. To generate the javadocs, add "-DcreateJavadoc=true" to the command line and set the JAVA_HOME.
            Californium 2.x and newer can be used with java 7 or newer. If you want to build it with a jdk 7, but use also plugins which are only supported for newer jdks, the toolchain plugin could be used. That requires a toolchains configuration in "toolchains.xml" in your maven ".m2" folder. To use the jdk7 toolchain, add "-DuseToolchain=true" to the command line. To use the jdk7 toolchain and create javadocs, add "-DuseToolchainJavadoc=true" to the command line (JAVA_HOME is not required).
            To support EdDSA, either java 15, java 16, java 17 or java 11 with ed25519-java is required at runtime. Using java 15 (or newer) to build Californium, leaves out ed25519-java, using java 11 for building, includes ed25519-java by default. If ed25519-java should NOT be included into the californium's jars, add -Dno.net.i2p.crypto.eddsa=true to maven's arguments. Note: if "-DuseToolchain=true" is used and the actual jdk to build is java 11, you must disable the i2p eddsa support as well. In that case, it's still possible to use ed25519-java, if the eddsa-0.3.0.jar is provided to the classpath separately. Note: using the oracle build 28 of openjdk 11 uncovers, that calling EdDSAEngine.engineSetParameter(null) fails with ǸullPointerException instead of InvalidAlgorithmParameterException. That causes to fail the verification of the signature at all. Using the aptopen build seems not to call EdDSAEngine.engineSetParameter(null) and therefore works. ed25519-java seems to be not longer maintained. It's therefore recommended to update to newer jdks (e.g. 17) or to use Bouncy Castle (see next section, even if the Bouncy Castle support is experimental).

            Support

            To support EdDSA, either java 15, java 16, java 17 or java 11 with ed25519-java is required at runtime. Using java 15 (or newer) to build Californium, leaves out ed25519-java, using java 11 for building, includes ed25519-java by default. If ed25519-java should NOT be included into the californium's jars, add -Dno.net.i2p.crypto.eddsa=true to maven's arguments. Note: if "-DuseToolchain=true" is used and the actual jdk to build is java 11, you must disable the i2p eddsa support as well. In that case, it's still possible to use ed25519-java, if the eddsa-0.3.0.jar is provided to the classpath separately. Note: using the oracle build 28 of openjdk 11 uncovers, that calling EdDSAEngine.engineSetParameter(null) fails with ǸullPointerException instead of InvalidAlgorithmParameterException. That causes to fail the verification of the signature at all. Using the aptopen build seems not to call EdDSAEngine.engineSetParameter(null) and therefore works. ed25519-java seems to be not longer maintained. It's therefore recommended to update to newer jdks (e.g. 17) or to use Bouncy Castle (see next section, even if the Bouncy Castle support is experimental).
            Find more information at:

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