Extract custom data format in TCP payload using golang












0















I have an industrial sensor which is connected to a Interface Module that provides information to the end user via telnet.



Telnet Configuration



Port: 10001



Data Format: Little-Endian



Data payload



Preamble - 32 bit

Article number - 32 bit

Serial number - 32 bit

Channels - 64 bit

Status - 32 bit

Frame number M / - 16 bit/ 16 bit

bytes per frame

Measuring value counter - 32 bit

Measuring value frame 1 - N * 32 bit

..

..


This should be available after the TCP headers (if I understand correctly) i.e. Payload.



I am trying to learn golang with more practical examples and I am thinking in the following direction:




  1. Create a TCP server for listening to the sensor's Interface module IP and port number

  2. Extract the payload and just print it out as seperate parameters like preamble, article number etc. as a beginners task


I have gone through some blog-posts about TCP server/client creations but they only address string in their payload. How can I extract such a byte orientated custom payload as mentioned above?



P.S.



I can understand that this can be achieved in python probably via struct.pack and struct.unpack hence some correlation as understanding would be appreciated






go tcp telnet







share|improve this question





























    0















    I have an industrial sensor which is connected to a Interface Module that provides information to the end user via telnet.



    Telnet Configuration



    Port: 10001



    Data Format: Little-Endian



    Data payload



    Preamble - 32 bit
    
Article number - 32 bit
    
Serial number - 32 bit
    
Channels - 64 bit
    
Status - 32 bit
    
Frame number M / - 16 bit/ 16 bit
    
bytes per frame
    
Measuring value counter - 32 bit
    
Measuring value frame 1 - N * 32 bit
    
..
    
..


    This should be available after the TCP headers (if I understand correctly) i.e. Payload.



    I am trying to learn golang with more practical examples and I am thinking in the following direction:




    1. Create a TCP server for listening to the sensor's Interface module IP and port number

    2. Extract the payload and just print it out as seperate parameters like preamble, article number etc. as a beginners task


    I have gone through some blog-posts about TCP server/client creations but they only address string in their payload. How can I extract such a byte orientated custom payload as mentioned above?



    P.S.



    I can understand that this can be achieved in python probably via struct.pack and struct.unpack hence some correlation as understanding would be appreciated






    go tcp telnet







    share|improve this question



























      0












      0








      0








      I have an industrial sensor which is connected to a Interface Module that provides information to the end user via telnet.



      Telnet Configuration



      Port: 10001



      Data Format: Little-Endian



      Data payload



      Preamble - 32 bit
      
Article number - 32 bit
      
Serial number - 32 bit
      
Channels - 64 bit
      
Status - 32 bit
      
Frame number M / - 16 bit/ 16 bit
      
bytes per frame
      
Measuring value counter - 32 bit
      
Measuring value frame 1 - N * 32 bit
      
..
      
..


      This should be available after the TCP headers (if I understand correctly) i.e. Payload.



      I am trying to learn golang with more practical examples and I am thinking in the following direction:




      1. Create a TCP server for listening to the sensor's Interface module IP and port number

      2. Extract the payload and just print it out as seperate parameters like preamble, article number etc. as a beginners task


      I have gone through some blog-posts about TCP server/client creations but they only address string in their payload. How can I extract such a byte orientated custom payload as mentioned above?



      P.S.



      I can understand that this can be achieved in python probably via struct.pack and struct.unpack hence some correlation as understanding would be appreciated






      go tcp telnet







      share|improve this question
















      I have an industrial sensor which is connected to a Interface Module that provides information to the end user via telnet.



      Telnet Configuration



      Port: 10001



      Data Format: Little-Endian



      Data payload



      Preamble - 32 bit
      
Article number - 32 bit
      
Serial number - 32 bit
      
Channels - 64 bit
      
Status - 32 bit
      
Frame number M / - 16 bit/ 16 bit
      
bytes per frame
      
Measuring value counter - 32 bit
      
Measuring value frame 1 - N * 32 bit
      
..
      
..


      This should be available after the TCP headers (if I understand correctly) i.e. Payload.



      I am trying to learn golang with more practical examples and I am thinking in the following direction:




      1. Create a TCP server for listening to the sensor's Interface module IP and port number

      2. Extract the payload and just print it out as seperate parameters like preamble, article number etc. as a beginners task


      I have gone through some blog-posts about TCP server/client creations but they only address string in their payload. How can I extract such a byte orientated custom payload as mentioned above?



      P.S.



      I can understand that this can be achieved in python probably via struct.pack and struct.unpack hence some correlation as understanding would be appreciated






      go tcp telnet




      go tcp telnet






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 22 '18 at 10:26







      Shan-Desai

















      asked Nov 22 '18 at 10:18









      Shan-DesaiShan-Desai

      8621034




      8621034
























          1 Answer
          1






          active

          oldest

          votes


















          1














          In section 6.2 of your linked pdf document above there is a table listing the data you seem to list in the question



          I would convert that table into a struct and then read into it with the encoding/binary module. See https://golang.org/pkg/encoding/binary/#example_Read for a relevant example



          "All measuring values are transmitted as Int32, Uint32 or Float depending on the connected sensor" probably easiest to get them as uint32 and then convert them later






          share|improve this answer























            Your Answer






            StackExchange.ifUsing("editor", function () {
            StackExchange.using("externalEditor", function () {
            StackExchange.using("snippets", function () {
            StackExchange.snippets.init();
            });
            });
            }, "code-snippets");

            StackExchange.ready(function() {
            var channelOptions = {
            tags: "".split(" "),
            id: "1"
            };
            initTagRenderer("".split(" "), "".split(" "), channelOptions);

            StackExchange.using("externalEditor", function() {
            // Have to fire editor after snippets, if snippets enabled
            if (StackExchange.settings.snippets.snippetsEnabled) {
            StackExchange.using("snippets", function() {
            createEditor();
            });
            }
            else {
            createEditor();
            }
            });

            function createEditor() {
            StackExchange.prepareEditor({
            heartbeatType: 'answer',
            autoActivateHeartbeat: false,
            convertImagesToLinks: true,
            noModals: true,
            showLowRepImageUploadWarning: true,
            reputationToPostImages: 10,
            bindNavPrevention: true,
            postfix: "",
            imageUploader: {
            brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
            contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
            allowUrls: true
            },
            onDemand: true,
            discardSelector: ".discard-answer"
            ,immediatelyShowMarkdownHelp:true
            });


            }
            });














            draft saved

            draft discarded


















            StackExchange.ready(
            function () {
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53428674%2fextract-custom-data-format-in-tcp-payload-using-golang%23new-answer', 'question_page');
            }
            );

            Post as a guest















            Required, but never shown

























            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            1














            In section 6.2 of your linked pdf document above there is a table listing the data you seem to list in the question



            I would convert that table into a struct and then read into it with the encoding/binary module. See https://golang.org/pkg/encoding/binary/#example_Read for a relevant example



            "All measuring values are transmitted as Int32, Uint32 or Float depending on the connected sensor" probably easiest to get them as uint32 and then convert them later






            share|improve this answer




























              1














              In section 6.2 of your linked pdf document above there is a table listing the data you seem to list in the question



              I would convert that table into a struct and then read into it with the encoding/binary module. See https://golang.org/pkg/encoding/binary/#example_Read for a relevant example



              "All measuring values are transmitted as Int32, Uint32 or Float depending on the connected sensor" probably easiest to get them as uint32 and then convert them later






              share|improve this answer


























                1












                1








                1







                In section 6.2 of your linked pdf document above there is a table listing the data you seem to list in the question



                I would convert that table into a struct and then read into it with the encoding/binary module. See https://golang.org/pkg/encoding/binary/#example_Read for a relevant example



                "All measuring values are transmitted as Int32, Uint32 or Float depending on the connected sensor" probably easiest to get them as uint32 and then convert them later






                share|improve this answer













                In section 6.2 of your linked pdf document above there is a table listing the data you seem to list in the question



                I would convert that table into a struct and then read into it with the encoding/binary module. See https://golang.org/pkg/encoding/binary/#example_Read for a relevant example



                "All measuring values are transmitted as Int32, Uint32 or Float depending on the connected sensor" probably easiest to get them as uint32 and then convert them later







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 22 '18 at 10:43









                VorsprungVorsprung

                23.2k32144




                23.2k32144
































                    draft saved

                    draft discarded




















































                    Thanks for contributing an answer to Stack Overflow!


                    • Please be sure to answer the question. Provide details and share your research!

                    But avoid …



                    • Asking for help, clarification, or responding to other answers.

                    • Making statements based on opinion; back them up with references or personal experience.


                    To learn more, see our tips on writing great answers.




                    draft saved


                    draft discarded














                    StackExchange.ready(
                    function () {
                    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53428674%2fextract-custom-data-format-in-tcp-payload-using-golang%23new-answer', 'question_page');
                    }
                    );

                    Post as a guest















                    Required, but never shown





















































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown

































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown







                    Popular posts from this blog

                    MongoDB - Not Authorized To Execute Command

                    Image
                    .everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box; } 0 I have successfully enabled authorization on MongoDB and I have created an account on the admin database and then I created an account for my database called test. The following connection string to connect to my test database works successfully: mongo --host 192.168.17.52 --port 27017 -u user1 -p password --authenticationDatabase test Only problem I have now is, I cannot execute commands such as: show dbs. I get the following error when I try to do so: "errmsg" : "not authorized on admin to execute command { listDatabases: 1.0, lsid: { id: UUID("a1d5bc0d-bc58-485e-b232-270758a89455") }, $db: "admin...
                    Read more

                    Npm cannot find a required file even through it is in the searched directory

                    Image
                    up vote 0 down vote favorite I got that error: users-Air:pdfuploader user$ npm run start client@0.1.0 start /Users/user/Documents/pdfuploader react-scripts start Could not find a required file. Name: index.html Searched in: /Users/user/Documents/pdfuploader/public npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! client@0.1.0 start: `react-scripts start` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the client@0.1.0 start script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above. npm ERR! A complete log of this run can be found in: npm ERR! /Users/user/.npm/_logs/2018-11-19T10_19_14_555Z-debug.log users-Air:pdfuploader user$ And the file is in /Users/user/Documents/pdfuploader/public as you can see in my github repository: https://github.c...
                    Read more

                    in spring boot 2.1 many test slices are not allowed anymore due to multiple @BootstrapWith

                    Image
                    1 I tried to upgrade a yummy sandwich made of two test slices (@JsonTest and @JdbcTest in my case, crunchy test code in between) adding spring boot 2.1 flavour to it. But it seems it was not much of a success. I cannot annotate my tests with many @...Test since they are now each bringing their own XxxTestContextBootstrapper. It used to work when they all used same SpringBootTestContextBootstrapper. @RunWith(SpringRunner.class) @JdbcTest @JsonTest public class Test { @Test public void test() { System.out.printn("Hello, World !"); } } The error I get from BootstrapUtils is illegalStateException : Configuration error: found multiple declarations of @BootstrapWith for test class I understand I might be doing something wrong here but is there an easy way I could load both Json and Jdbc contex...
                    Read more