{"id":2960,"date":"2017-12-11T19:24:54","date_gmt":"2017-12-11T19:24:54","guid":{"rendered":"http:\/\/grodansparadis.com\/wordpress\/?p=2960"},"modified":"2017-12-11T19:24:54","modified_gmt":"2017-12-11T19:24:54","slug":"vscp-howto-dm-write-append-to-file","status":"publish","type":"post","link":"https:\/\/grodansparadis.com\/wordpress\/?p=2960","title":{"rendered":"#VSCP HOWTO: DM write\/append to file"},"content":{"rendered":"

\"\"<\/a><\/p>\n

The Level I logger<\/a> and the Level II logger<\/a> are great tools for logging events in a VSCP based system.\u00a0 Useful also for debugging etc. Another method is to use the execute external program action<\/a> and execute a script and write to a file there. We have seen this method being used in other howtos.\u00a0 Also while running a JavaScript or a Lua script files can be written.<\/p>\n

But…<\/p>\n

file writing is also available as an action.\u00a0 It is documented here<\/a>. This action allows writing or appending a string with output to a named file that is created if it does not exist. With the VSCP escapes<\/a> a lot of dynamic information can go into this file.<\/p>\n

Suppose that we want to\u00a0 log events of a certain type to a file, here CLASS1.DATA, Type=2 A\/D values form a specific device. We then write a decision matrix (DM) row<\/p>\n

<row enable=\"true\" groupid=\"\" >\r\n\r\n<comment>\r\n Collect A\/D values from node X\r\n<\/comment>\r\n\r\n<mask priority=\"0\"\r\n class=\"0xFFFF\"\r\n type=\"0xFFFF\"\r\n GUID=\"FF:FF:FF:FF:FF:FF:FF:FF:FF:FF:FF:FF:FF:FF:FF:FF\" \/>\r\n\r\n<filter priority=\"0\"\r\n class=\"15\"\r\n type=\"2\"\r\n GUID=\"00:01:02:03:04:05:06:07:08:09:0A:0B:0C:0D:0E:0F\" \/>\r\n\r\n<action>0x70<\/action>\r\n <param>\r\n \/tmp\/addata;1;%isoboth: %measurement.string %lf \r\n <\/param>\r\n\r\n<\/row><\/pre>\n
will generate output content like this<\/p>\n
\"\"<\/a><\/p>\n
With the other VSCP escapes<\/a> and literals you have many options to generate meaningful output.<\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
The Level I logger and the Level II logger are great tools for logging events in a VSCP based system.\u00a0 Useful also for debugging etc. Another method is to use the execute external program action and execute a script and write to a file there. We have seen this method being used in other howtos.\u00a0 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[53,13],"tags":[],"class_list":["post-2960","post","type-post","status-publish","format-standard","hentry","category-howtos","category-vscp"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p4raCZ-LK","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/grodansparadis.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2960","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/grodansparadis.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/grodansparadis.com\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/grodansparadis.com\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/grodansparadis.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2960"}],"version-history":[{"count":1,"href":"https:\/\/grodansparadis.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2960\/revisions"}],"predecessor-version":[{"id":2962,"href":"https:\/\/grodansparadis.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2960\/revisions\/2962"}],"wp:attachment":[{"href":"https:\/\/grodansparadis.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2960"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/grodansparadis.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2960"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/grodansparadis.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}