{"id":4350,"date":"2021-02-10T09:39:41","date_gmt":"2021-02-10T08:39:41","guid":{"rendered":"https:\/\/www.basyskom.de\/?p=4350"},"modified":"2024-07-30T14:14:21","modified_gmt":"2024-07-30T12:14:21","slug":"logging-improvements-in-qt-opc-ua","status":"publish","type":"post","link":"https:\/\/www.basyskom.de\/en\/logging-improvements-in-qt-opc-ua\/","title":{"rendered":"Qt OPC UA: Logging improvements in Qt 6.1"},"content":{"rendered":"
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Background<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Qt OPC UA itself uses Qt Categorized Logging internally. We document the logging categories here<\/a>. So where does all this chatter come from? The open62541 stack has its own logging mechanism which is used to provide some insight into the stack itself. A plugin API allows to customize where this output is sent to. The default implementation, which we used so far, writes everything to stdout.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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The new approach<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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As we did not just want to mute the open62541 output, potentially losing important information, we wrote a small plugin for the open62541 logging API to redirect the low-level open62541 output into a set of additional logging categories, all under the common qt.opcua.plugins.open62541.sdk prefix. To e.g. completely silence the low-level logs you would set “qt.opcua.plugins.open62541.sdk.*=false” as a filter.<\/p>

Please have a look at the commit<\/a> itself for the new categories. Updated documentation will be available with the Qt 6.1 release.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

So far programs using Qt OPC UA with the open62541 back-end produced quite a bit of chatter on stdout originating from the open62541 stack itself. Unfortunately there was no simple way to get rid of these low-level logs. We now provide a way to control this behavior.<\/p>","protected":false},"author":2,"featured_media":4446,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1,2,230,183,8],"tags":[124,122,15,123,229],"class_list":["post-4350","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-allgemein","category-blog","category-opc-ua","category-open62541","category-qt","tag-opc-ua","tag-open62541","tag-qt","tag-qt-opc-ua","tag-qt6"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/posts\/4350","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/comments?post=4350"}],"version-history":[{"count":32,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/posts\/4350\/revisions"}],"predecessor-version":[{"id":11180,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/posts\/4350\/revisions\/11180"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/media\/4446"}],"wp:attachment":[{"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/media?parent=4350"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/categories?post=4350"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/tags?post=4350"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}