{"id":99,"date":"2019-08-27T22:51:13","date_gmt":"2019-08-27T21:51:13","guid":{"rendered":"http:\/\/tescaweb.nl\/Carel\/?p=99"},"modified":"2022-01-26T14:08:36","modified_gmt":"2022-01-26T13:08:36","slug":"starting-with-mqtt","status":"publish","type":"post","link":"http:\/\/tescaweb.nl\/Carel\/?p=99","title":{"rendered":"Starting with MQTT"},"content":{"rendered":"\t\t
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<\/p>\n

(c)2019- 2020 C. ing. Van Leeuwen Btw. for TesCaWeb, Enschede Netherlands
<\/span>version 1.11 <\/span><\/h2>\n

Mosquitto MQTT on the PC<\/h2>\n

<\/p>\n

Step one:<\/h3>\n

<\/p>\n

I have installed\u00a0Mosquitto MQTT (version 1.6.4)<\/a>\u00a0in H:\/program files\/Mosquitto.
And perform\u00a0the basic tests<\/a>.
In the Mosquitto map there are 3 files:<\/p>\n

<\/p>\n

    \n
  1. Mosquitto<\/a>: the broker<\/li>\n
  2. Mosquitto_pub<\/a>: example of a publisher (sender of information about a topic)<\/li>\n
  3. Mosquitto_sub<\/a>:\u00a0example of a subscriber\u00a0(receiver of information about a topic)<\/li>\n<\/ol>\n
    \u00a0<\/div>\n
    \u00a0\"\"<\/div>\n

    <\/p>\n

    With starting 3 or more Commandline boxes on the PC and following the in the basic test I was able to see how MQTT is working.
    Note: The\u00a0    Mosquitto_rr<\/a>\u00a0(combination of publisher and subscriber)\u00a0 was not available after the installation.
    I am still searching for this one.
    Playing with the parameters, with the Windows Power Shell\u00a0(WPS)\u00a0<\/span>script it is easier to change the parameters.<\/span><\/p>\n


    <\/span>The WPS\u00a0script to start up the 3 command windows (update 30-08-2019):<\/span>
    <\/span><\/p>\n

    <\/p>\n

    #https:\/\/docs.microsoft.com\/en-us\/powershell\/module\/microsoft.powershell.management\/start-process?view=powershell-6\n#https:\/\/ss64.com\/nt\/cmd.html\n\nH:\ncd \"H:\\Program Files\\mosquitto\"\n#start-Process \"cmd.exe\" -ArgumentList \"\/K\", \"`\"H:\\Program Files\\mosquitto\\mosquitto.exe`\"\", \" -c \", \"mosquittoCvL.conf\",\" -v \"\n#Start-Process \"cmd.exe\" -ArgumentList \"\/K\", \"`\"H:\\Program Files\\mosquitto\\mosquitto_sub.exe`\"\",  \"-v -t test \"\n#Start-Process \"cmd.exe\" -ArgumentList \"\/K\", \"`\"H:\\Program Files\\mosquitto\\mosquitto_pub.exe`\"\",  \"-t test -m 'helloWorld' \", \" --repeat \",  \"4\", \" --repeat-delay 1 \"\n# put this on the command line for a next message \"H:\\Program Files\\mosquitto\\mosquitto_pub.exe\"  -t 'test\/topic' -m 'helloWorld'<\/code><\/pre>\n
    <\/p>\n
    Step two:<\/h3>\n
    <\/p>\n
    The Mosquitto broker has also support for websockets. So it will be possible to make use of a browser the receive and send information.
    Ltes find out how this is working.<\/p>\n
    First I need to modify the configuration file:
    \u00a0Find a HTML-JScript example that can be used as MQTT client.
    I am using\u00a0https:\/\/www.eclipse.org\/paho, there you will find jScript support (paho.javascript-1.0.3 library)\u00a0 for MQTT web sockets.\u00a0<\/p>\n
    Remark:
    When executing the html file as locale there is a problem with MS-Edge.
    Microsoft Edge is not usable for the\u00a0 Paho \u00a0 bacause it is blocking something. I am using Chrome now<\/p>\n
    <\/p>\n
    Step three<\/h3>\n
    <\/p>\n
    Writing my own client\u00a0Step four:Creating a SLI for the fischertechnik TXT, this to add MQTT functionality as RoboPro elements to RoboPro<\/p>\n
    <\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"
    About a simple experiment with MQTT basic commands.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":""},"categories":[6,10,11,7],"tags":[],"post_folder":[],"_links":{"self":[{"href":"http:\/\/tescaweb.nl\/Carel\/index.php?rest_route=\/wp\/v2\/posts\/99"}],"collection":[{"href":"http:\/\/tescaweb.nl\/Carel\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/tescaweb.nl\/Carel\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/tescaweb.nl\/Carel\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/tescaweb.nl\/Carel\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=99"}],"version-history":[{"count":1,"href":"http:\/\/tescaweb.nl\/Carel\/index.php?rest_route=\/wp\/v2\/posts\/99\/revisions"}],"predecessor-version":[{"id":791,"href":"http:\/\/tescaweb.nl\/Carel\/index.php?rest_route=\/wp\/v2\/posts\/99\/revisions\/791"}],"wp:attachment":[{"href":"http:\/\/tescaweb.nl\/Carel\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=99"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/tescaweb.nl\/Carel\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=99"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/tescaweb.nl\/Carel\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=99"},{"taxonomy":"post_folder","embeddable":true,"href":"http:\/\/tescaweb.nl\/Carel\/index.php?rest_route=%2Fwp%2Fv2%2Fpost_folder&post=99"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}