MQTT Protocol

MQTT is a handy protocol for sending/receiving lightweight data.

What is MQTT

MQTT stands for MQ Telemetry Transport. It is a publish/subscribe, extremely simple and lightweight messaging protocol, designed for constrained devices and low-bandwidth, high-latency or unreliable networks. The design principles are to minimise network bandwidth and device resource requirements whilst also attempting to ensure reliability and some degree of assurance of delivery. These principles also turn out to make the protocol ideal of the emerging “machine-to-machine” (M2M) or “Internet of Things” world of connected devices, and for mobile applications where bandwidth and battery power are at a premium.

V5.0 and v3.1.1 are OASIS standards (v3.1.1 is also a standard for ISO)

Protocol

The standard ports for MQTT to use.

TCP/IP port 1883 is reserved with IANA for use with MQTT.
TCP/IP port 8883 is also registered, for using MQTT over SSL.

What security does MQTT support.

You can pass a user name and password with an MQTT packet in V3.1 of the protocol. Encryption across the network can be handled with SSL, independently of the MQTT protocol itself (it is worth noting that SSL is not the lightest of protocols, and does add significant network overhead). Additional security can be added by an application encrypting data that it sends and receives, but this is not something built-in to the protocol, in order to keep it simple and lightweight.

Toggle Console (0)
No entries found.
Profiler (0 ms)
No entries found.
SQL (47 queries | 20.84 ms)
1.7450
SELECT name, val 
FROM www_wfconfig 
WHERE autoload = 'yes'
0.4718
SELECT `name`, `value` 
FROM `www_wfls_settings` 
WHERE `autoload` = 'yes'
0.2902
SELECT name, val, autoload 
FROM www_wfconfig 
WHERE name = 'detectProxyRecommendation'
1.1208
SHOW FULL COLUMNS 
FROM `www_wfblocks7`
0.4690
SELECT * 
FROM `www_wfblocks7` 
WHERE `IP` = '\0\0\0\0\0\0\0\0\0\0\"̺[' 
AND `type` = 7 
AND (`expiration` = 0 OR `expiration` > UNIX_TIMESTAMP())
0.2489
SELECT name, val, autoload 
FROM www_wfconfig 
WHERE name = 'wordfenceCentralConnected'
0.4110
SELECT option_value 
FROM www_options 
WHERE option_name = 'acm_server_settings' 
LIMIT 1
0.2570
SELECT name, val, autoload 
FROM www_wfconfig 
WHERE name = 'needsGeoIPSync'
0.2601
SELECT name, val, autoload 
FROM www_wfconfig 
WHERE name = 'detectProxyRecommendation'
0.2370
SELECT MAX(attackLogTime) 
FROM www_wfhits
0.2320
SELECT option_value 
FROM www_options 
WHERE option_name = 'wordfence_lastSyncAttackData' 
LIMIT 1
0.7079
SELECT *, CASE WHEN `type` = 3 THEN 0 WHEN `type` = 4 THEN 1 WHEN `type` = 7 THEN 2 WHEN `type` = 6 THEN 3 WHEN `type` = 5 THEN 4 WHEN `type` = 9 THEN 5 WHEN `type` = 8 THEN 6 WHEN `type` = 2 THEN 7 WHEN `type` = 1 THEN 8 ELSE 9999 END AS `typeSort`, CASE WHEN `type` = 3 THEN `parameters` WHEN `type` = 4 THEN `parameters` WHEN `type` = 1 THEN `IP` WHEN `type` = 9 THEN `IP` WHEN `type` = 5 THEN `IP` WHEN `type` = 6 THEN `IP` WHEN `type` = 7 THEN `IP` WHEN `type` = 2 THEN `IP` WHEN `type` = 8 THEN `IP` ELSE 9999 END AS `detailSort` 
FROM `www_wfblocks7` 
WHERE `type` IN (4) 
AND (`expiration` = 0 OR `expiration` > UNIX_TIMESTAMP()) 
ORDER BY `typeSort` ASC, `id` DESC
0.5150
SELECT *, CASE WHEN `type` = 3 THEN 0 WHEN `type` = 4 THEN 1 WHEN `type` = 7 THEN 2 WHEN `type` = 6 THEN 3 WHEN `type` = 5 THEN 4 WHEN `type` = 9 THEN 5 WHEN `type` = 8 THEN 6 WHEN `type` = 2 THEN 7 WHEN `type` = 1 THEN 8 ELSE 9999 END AS `typeSort`, CASE WHEN `type` = 3 THEN `parameters` WHEN `type` = 4 THEN `parameters` WHEN `type` = 1 THEN `IP` WHEN `type` = 9 THEN `IP` WHEN `type` = 5 THEN `IP` WHEN `type` = 6 THEN `IP` WHEN `type` = 7 THEN `IP` WHEN `type` = 2 THEN `IP` WHEN `type` = 8 THEN `IP` ELSE 9999 END AS `detailSort` 
FROM `www_wfblocks7` 
WHERE `type` IN (3) 
AND (`expiration` = 0 OR `expiration` > UNIX_TIMESTAMP()) 
ORDER BY `typeSort` ASC, `id` DESC
0.4520
SELECT * 
FROM `www_wfblocks7` 
WHERE `type` IN (1, 8, 9, 2, 5, 6) 
AND `IP` = '\0\0\0\0\0\0\0\0\0\0\"̺[' 
AND (`expiration` = 0 OR `expiration` > UNIX_TIMESTAMP()) 
ORDER BY `blockedTime` DESC 
LIMIT 1
0.5510
SELECT option_value 
FROM www_options 
WHERE option_name = 'can_compress_scripts' 
LIMIT 1
0.3929
SELECT option_value 
FROM www_options 
WHERE option_name = 'ure_role_additional_options_values' 
LIMIT 1
0.7648
SHOW FULL COLUMNS 
FROM `www_wflivetraffichuman`
0.2410
SELECT COUNT(*) 
FROM www_wflivetraffichuman 
WHERE IP = '\0\0\0\0\0\0\0\0\0\0\"̺[' 
AND identifier = 'F	V\nV|!' 
AND expiration >= UNIX_TIMESTAMP()
0.3800
SELECT t.*, tt.* 
FROM www_terms AS t 
INNER JOIN www_term_taxonomy AS tt ON t.term_id = tt.term_id 
WHERE tt.taxonomy IN ('category') 
AND t.slug = 'skp-iot-iopgaver' 
LIMIT 1
0.2811
SELECT t.*, tt.* 
FROM www_terms AS t 
INNER JOIN www_term_taxonomy AS tt ON t.term_id = tt.term_id 
WHERE tt.taxonomy IN ('category') 
AND t.slug IN ('skp-iot-iopgaver')
0.2279
SELECT t.*, tt.* 
FROM www_terms AS t 
INNER JOIN www_term_taxonomy AS tt ON t.term_id = tt.term_id 
WHERE tt.taxonomy IN ('category') 
AND t.term_id IN ( 9 )
0.7780
SELECT SQL_CALC_FOUND_ROWS www_posts.ID 
FROM www_posts LEFT JOIN www_term_relationships ON (www_posts.ID = www_term_relationships.object_id) 
WHERE 1=1 
AND ( www_term_relationships.term_taxonomy_id IN (9) ) 
AND www_posts.post_type = 'post' 
AND (www_posts.post_status = 'publish') 
GROUP BY www_posts.ID 
ORDER BY www_posts.post_date DESC 
LIMIT 0, 4
0.1602
SELECT FOUND_ROWS()
0.3469
SELECT www_posts.* 
FROM www_posts 
WHERE ID IN (1303)
1.4350
SELECT t.*, tt.*, tr.object_id 
FROM www_terms AS t 
INNER JOIN www_term_taxonomy AS tt ON t.term_id = tt.term_id 
INNER JOIN www_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id 
WHERE tt.taxonomy IN ('category', 'post_tag', 'post_format') 
AND tr.object_id IN (1303) 
ORDER BY t.name ASC
0.4120
SELECT post_id, meta_key, meta_value 
FROM www_postmeta 
WHERE post_id IN (1303) 
ORDER BY meta_id ASC
0.4718
SELECT t.*, tt.* 
FROM www_terms AS t 
INNER JOIN www_term_taxonomy AS tt ON t.term_id = tt.term_id 
WHERE t.term_id = 21
0.2201
SELECT COUNT(*) 
FROM www_wflivetraffichuman 
WHERE IP = '\0\0\0\0\0\0\0\0\0\0\"̺[' 
AND identifier = 'F	V\nV|!' 
AND expiration >= UNIX_TIMESTAMP()
0.2520
SELECT * 
FROM www_users 
WHERE ID = '2' 
LIMIT 1
0.3500
SELECT user_id, meta_key, meta_value 
FROM www_usermeta 
WHERE user_id IN (2) 
ORDER BY umeta_id ASC
0.3941
SELECT * 
FROM `www_yoast_indexable` 
WHERE `object_id` = '9' 
AND `object_type` = 'term' 
LIMIT 1
0.3300
SELECT * 
FROM `www_yoast_indexable` 
WHERE `object_type` = 'home-page' 
LIMIT 1
0.2520
SELECT `ancestor_id` 
FROM `www_yoast_indexable_hierarchy` 
WHERE `indexable_id` = '170' 
ORDER BY `depth` DESC
0.3328
SELECT * 
FROM `www_yoast_indexable` 
WHERE `id` IN ('162', '169') 
ORDER BY FIELD(id,162,169)
0.1850
SELECT option_value 
FROM www_options 
WHERE option_name = 'https_migration_required' 
LIMIT 1
0.2830
SELECT t.*, tt.* 
FROM www_terms AS t 
INNER JOIN www_term_taxonomy AS tt ON t.term_id = tt.term_id 
WHERE t.term_id = 15
0.2520
SELECT tr.object_id 
FROM www_term_relationships AS tr 
INNER JOIN www_term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id 
WHERE tt.taxonomy IN ('nav_menu') 
AND tt.term_id IN ('15') 
ORDER BY tr.object_id ASC
0.5269
SELECT www_posts.* 
FROM www_posts 
WHERE 1=1 
AND www_posts.ID IN (310,311,312,313,314,337,365,399,1162,1163,1185,1482) 
AND www_posts.post_type = 'nav_menu_item' 
AND ((www_posts.post_status = 'publish')) 
ORDER BY www_posts.menu_order ASC
0.6881
SELECT post_id, meta_key, meta_value 
FROM www_postmeta 
WHERE post_id IN (310,1163,311,312,313,314,1185,1162,399,365,1482,337) 
ORDER BY meta_id ASC
0.5071
SELECT www_posts.* 
FROM www_posts 
WHERE 1=1 
AND www_posts.ID IN (290,292,295,297,1183,76,362,1470,80) 
AND www_posts.post_type = 'page' 
AND ((www_posts.post_status = 'publish')) 
ORDER BY www_posts.post_date DESC
0.4001
SELECT post_id, meta_key, meta_value 
FROM www_postmeta 
WHERE post_id IN (1470,1183,362,297,295,292,290,80,76) 
ORDER BY meta_id ASC
0.2532
SELECT * 
FROM www_posts 
WHERE ID = 92 
LIMIT 1
0.1941
SELECT * 
FROM www_posts 
WHERE ID = 92 
LIMIT 1
0.2339
SELECT * 
FROM www_posts 
WHERE ID = 92 
LIMIT 1
0.2301
SELECT * 
FROM www_posts 
WHERE ID = 92 
LIMIT 1
0.4199
SELECT t.*, tt.* 
FROM www_terms AS t 
INNER JOIN www_term_taxonomy AS tt ON t.term_id = tt.term_id 
WHERE tt.taxonomy IN ('category') 
AND t.name IN ('skp-iot-iopgaver') 
LIMIT 1
0.6721
SELECT www_posts.*, CHAR_LENGTH(www_posts.post_title) post_title_length 
FROM www_posts 
WHERE 1=1 
AND www_posts.ID NOT IN (1303) 
AND www_posts.post_type = 'encyclopedia' 
AND (www_posts.post_status = 'publish') 
ORDER BY post_title_length DESC
Templates
[0] => themes/busiprof/theme_setup_data.php
[1] => themes/busiprof/child_theme_compatible.php
[2] => themes/busiprof/functions/menu/busiprof_nav_walker.php
[3] => themes/busiprof/functions/menu/default_menu_walker.php
[4] => themes/busiprof/functions/woo/woocommerce.php
[5] => themes/busiprof/functions/font/font.php
[6] => themes/busiprof/functions/breadcrumbs/breadcrumbs.php
[7] => themes/busiprof/functions/scripts/script.php
[8] => themes/busiprof/functions/widgets/custom-widgets.php
[9] => themes/busiprof/functions/commentbox/comment-function.php
[10] => themes/busiprof/functions/customizer/customizer-pro-feature.php
[11] => themes/busiprof/functions/customizer/custo_general_settings.php
[12] => themes/busiprof/functions/customizer/custo_sections_settings.php
[13] => themes/busiprof/functions/customizer/customizer-archive.php
[14] => themes/busiprof/functions/customizer/customizer_recommended_plugin.php
[15] => themes/busiprof/functions/customizer-notify/busiprof-customizer-notify.php
[16] => themes/busiprof/functions/class-tgm-plugin-activation.php
[17] => themes/busiprof/category.php
[18] => themes/busiprof/header.php
[19] => themes/busiprof/content.php
[20] => themes/busiprof/sidebar.php
[21] => themes/busiprof/footer.php
Globals
$_GET = array (
);

$_POST = array (
);

$_COOKIE = array (
);

$_SESSION = array (
);

$_SERVER = array (
  'SERVER_SOFTWARE' => 'Apache',
  'REQUEST_URI' => '/category/skp-opgaver/tvaerfaglige-opgaver/skp-iot-iopgaver/',
  'ONECOM_DOMAIN_NAME' => 'ats-skpdatait.dk',
  'ONECOM_DOMAIN_ROOT' => '/customers/b/3/2/ats-skpdatait.dk/',
  'ONECOM_MEMORYLIMIT' => '2684354560',
  'ONECOM_CPU_SHARES' => '4096',
  'ONECOM_EXEC' => 'latest',
  'ONECOM_DIR_LAYOUT_VER' => '0',
  'CONTENT_LENGTH' => '0',
  'HTTP_CONNECTION' => 'close',
  'SCRIPT_NAME' => '/index.php',
  'QUERY_STRING' => '',
  'REQUEST_METHOD' => 'GET',
  'SERVER_PROTOCOL' => 'HTTP/1.1',
  'GATEWAY_INTERFACE' => 'CGI/1.1',
  'REDIRECT_URL' => '/category/skp-opgaver/tvaerfaglige-opgaver/skp-iot-iopgaver/',
  'REMOTE_PORT' => '55434',
  'SCRIPT_FILENAME' => '/customers/b/3/2/ats-skpdatait.dk/httpd.www/index.php',
  'SERVER_ADMIN' => 'support@one.com',
  'CONTEXT_DOCUMENT_ROOT' => '/var/www',
  'CONTEXT_PREFIX' => '',
  'REQUEST_SCHEME' => 'https',
  'REMOTE_ADDR' => '34.204.186.91',
  'SERVER_PORT' => '80',
  'SERVER_ADDR' => '10.27.3.13',
  'SERVER_NAME' => 'www.ats-skpdatait.dk',
  'SERVER_SIGNATURE' => '',
  'PATH' => '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin',
  'HTTP_X_VARNISH' => '338629520',
  'HTTP_ACCEPT_ENCODING' => 'gzip',
  'HTTP_X_ONECOM_HOST' => 'ats-skpdatait.dk',
  'HTTP_X_ONECOM_BRAND' => 'one.com',
  'HTTP_X_FORWARDED_PROTO' => 'https',
  'HTTP_X_ONECOM_FORWARDED_PROTO' => 'https',
  'HTTP_X_FORWARDED_FOR' => '34.204.186.91',
  'HTTP_HOST' => 'www.ats-skpdatait.dk',
  'HTTP_ACCEPT_LANGUAGE' => 'en-US,en;q=0.5',
  'HTTP_ACCEPT' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
  'HTTP_USER_AGENT' => 'CCBot/2.0 (https://commoncrawl.org/faq/)',
  'ENV_VCV_ENV_ADDONS_ID' => 'one.com',
  'ENV_VCV_TOKEN_URL' => 'https://wpapi.one.com/api/v1.0/plugins/visualcomposer/activate',
  'ONECOM_ONE_PHOTO_URL' => 'https://onephoto.one.com/domain_discover',
  'ONECOM_WP_ADDONS_API' => 'https://wpapi.one.com',
  'ONECOM_WEBSHOP_HOST' => 'webshop1.cst.webpod11-cph3.one.com',
  'HTTP_AUTHORIZATION' => '',
  'HTTPS' => 'on',
  'ONECOM_TMPDIR' => '/customers/b/3/2/ats-skpdatait.dk//tmp',
  'DOMAIN_NAME' => 'ats-skpdatait.dk',
  'ONECOM_DOCUMENT_ROOT' => '/customers/b/3/2/ats-skpdatait.dk/httpd.www',
  'DOCUMENT_ROOT' => '/customers/b/3/2/ats-skpdatait.dk/httpd.www',
  'REDIRECT_STATUS' => '200',
  'REDIRECT_ENV_VCV_ENV_ADDONS_ID' => 'one.com',
  'REDIRECT_ENV_VCV_TOKEN_URL' => 'https://wpapi.one.com/api/v1.0/plugins/visualcomposer/activate',
  'REDIRECT_ONECOM_ONE_PHOTO_URL' => 'https://onephoto.one.com/domain_discover',
  'REDIRECT_ONECOM_WP_ADDONS_API' => 'https://wpapi.one.com',
  'REDIRECT_ONECOM_WEBSHOP_HOST' => 'webshop1.cst.webpod11-cph3.one.com',
  'REDIRECT_HTTP_AUTHORIZATION' => '',
  'REDIRECT_HTTPS' => 'on',
  'REDIRECT_ONECOM_CPU_SHARES' => '4096',
  'REDIRECT_ONECOM_MEMORYLIMIT' => '2684354560',
  'REDIRECT_ONECOM_EXEC' => 'latest',
  'REDIRECT_ONECOM_DIR_LAYOUT_VER' => '0',
  'REDIRECT_ONECOM_TMPDIR' => '/customers/b/3/2/ats-skpdatait.dk//tmp',
  'REDIRECT_ONECOM_DOMAIN_ROOT' => '/customers/b/3/2/ats-skpdatait.dk/',
  'REDIRECT_ONECOM_DOMAIN_NAME' => 'ats-skpdatait.dk',
  'REDIRECT_DOMAIN_NAME' => 'ats-skpdatait.dk',
  'REDIRECT_ONECOM_DOCUMENT_ROOT' => '/customers/b/3/2/ats-skpdatait.dk/httpd.www',
  'REDIRECT_DOCUMENT_ROOT' => '/customers/b/3/2/ats-skpdatait.dk/httpd.www',
  'FCGI_ROLE' => 'RESPONDER',
  'PHP_SELF' => '/index.php',
  'REQUEST_TIME_FLOAT' => 1618692909.832376956939697265625,
  'REQUEST_TIME' => 1618692909,
  'ONECOM_CLIENT_IP' => '34.204.186.91',
);

Close