{"id":2453,"date":"2019-07-25T17:31:20","date_gmt":"2019-07-25T16:31:20","guid":{"rendered":"https:\/\/ridgesolutions.ie\/?p=2453"},"modified":"2019-07-25T17:32:15","modified_gmt":"2019-07-25T16:32:15","slug":"paho-javascript-client-figure-out-received-messages-mqtt-topic","status":"publish","type":"post","link":"https:\/\/www.ridgesolutions.ie\/index.php\/2019\/07\/25\/paho-javascript-client-figure-out-received-messages-mqtt-topic\/","title":{"rendered":"Paho Javascript Client &#8211; Figure out received message&#8217;s MQTT topic"},"content":{"rendered":"<p>When using the <a href=\"https:\/\/www.eclipse.org\/paho\/clients\/js\/\">Paho Javascript client<\/a> from MQTT; when a message arrives via <strong>client.onMessageArrived()<\/strong>, how can we figure out the message&#8217;s topic.<\/p>\n<p>This threw me for a bit as the <a href=\"https:\/\/www.eclipse.org\/paho\/files\/jsdoc\/Paho.MQTT.Message.html\">documentation<\/a> for the message object doesn&#8217;t mention &#8216;topic&#8217; at all &#8211; but it turns out that the topic name is stored in the<strong> message.destinationName<\/strong> field! (panic over)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When using the Paho Javascript client from MQTT; when a message arrives via client.onMessageArrived(), how can we figure out the message&#8217;s topic. This threw me for a bit as the documentation for the message object doesn&#8217;t mention &#8216;topic&#8217; at all &#8211; but it turns out that the topic name is stored in the message.destinationName field! [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[301],"tags":[],"class_list":["post-2453","post","type-post","status-publish","format-standard","hentry","category-by-kevin-godden"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"When using the Paho Javascript client from MQTT; when a message arrives via client.onMessageArrived(), how can we figure out the message&#039;s topic. This threw me for a bit as the documentation for the message object doesn&#039;t mention &#039;topic&#039; at all - but it turns out that the topic name is stored in the message.destinationName field!\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Kevin Godden\"\/>\n\t<meta name=\"google-site-verification\" content=\"Kyj52YLp6GOPA44PVBffo9fjW8rgWHYYRF0ZYjfy6ss\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.ridgesolutions.ie\/index.php\/2019\/07\/25\/paho-javascript-client-figure-out-received-messages-mqtt-topic\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.0.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Systems and Embedded Software Engineering, Ireland. | Some thoughts of a busy Computer Engineer\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Paho Javascript Client \u2013 Figure out received message\u2019s MQTT topic\" \/>\n\t\t<meta property=\"og:description\" content=\"When using the Paho Javascript client from MQTT; when a message arrives via client.onMessageArrived(), how can we figure out the message&#039;s topic. 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