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.

Skriv et svar

Din e-mailadresse vil ikke blive publiceret. Krævede felter er markeret med *

Toggle Console (0)
No entries found.
Profiler (0 ms)
No entries found.
SQL (41 queries | 20.47 ms)
2.0671
SELECT name, val 
FROM www_wfconfig 
WHERE autoload = 'yes'
0.4039
SELECT `name`, `value` 
FROM `www_wfls_settings` 
WHERE `autoload` = 'yes'
0.3040
SELECT name, val, autoload 
FROM www_wfconfig 
WHERE name = 'detectProxyRecommendation'
1.2081
SHOW FULL COLUMNS 
FROM `www_wfblocks7`
0.5121
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())
0.2840
SELECT name, val, autoload 
FROM www_wfconfig 
WHERE name = 'wordfenceCentralConnected'
0.2449
SELECT option_value 
FROM www_options 
WHERE option_name = 'acm_server_settings' 
LIMIT 1
0.2601
SELECT name, val, autoload 
FROM www_wfconfig 
WHERE name = 'needsGeoIPSync'
0.2501
SELECT name, val, autoload 
FROM www_wfconfig 
WHERE name = 'detectProxyRecommendation'
0.2339
SELECT MAX(attackLogTime) 
FROM www_wfhits
0.2351
SELECT option_value 
FROM www_options 
WHERE option_name = 'wordfence_lastSyncAttackData' 
LIMIT 1
0.6931
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
0.5000
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
0.4060
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
0.4601
SELECT option_value 
FROM www_options 
WHERE option_name = 'can_compress_scripts' 
LIMIT 1
0.3011
SELECT option_value 
FROM www_options 
WHERE option_name = 'ure_role_additional_options_values' 
LIMIT 1
1.4911
SHOW FULL COLUMNS 
FROM `www_wflivetraffichuman`
0.4001
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()
0.8771
SELECT www_posts.* 
FROM www_posts 
WHERE 1=1 
AND ( ( YEAR( www_posts.post_date ) = 2019 
AND MONTH( www_posts.post_date ) = 11 
AND DAYOFMONTH( www_posts.post_date ) = 21 ) ) 
AND www_posts.post_name = 'mqtt-protocol' 
AND www_posts.post_type = 'post' 
ORDER BY www_posts.post_date DESC
1.7900
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
0.3541
SELECT post_id, meta_key, meta_value 
FROM www_postmeta 
WHERE post_id IN (1303) 
ORDER BY meta_id ASC
0.2601
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()
0.3421
SELECT * 
FROM www_users 
WHERE ID = '2' 
LIMIT 1
0.4961
SELECT user_id, meta_key, meta_value 
FROM www_usermeta 
WHERE user_id IN (2) 
ORDER BY umeta_id ASC
0.4840
SELECT * 
FROM `www_yoast_indexable` 
WHERE `object_id` = '1303' 
AND `object_type` = 'post' 
LIMIT 1
0.5052
SELECT * 
FROM `www_yoast_indexable` 
WHERE `object_type` = 'home-page' 
LIMIT 1
0.3879
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
0.3519
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
0.7541
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
0.7141
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
0.4070
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
0.3080
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
0.2210
SELECT * 
FROM www_posts 
WHERE ID = 92 
LIMIT 1
0.1850
SELECT * 
FROM www_posts 
WHERE ID = 92 
LIMIT 1
0.1650
SELECT * 
FROM www_posts 
WHERE ID = 92 
LIMIT 1
0.1380
SELECT * 
FROM www_posts 
WHERE ID = 92 
LIMIT 1
0.3421
SELECT t.term_id, tt.parent, tt.count, tt.taxonomy 
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') 
AND tr.object_id IN (1303) 
ORDER BY t.name ASC
0.1872
SELECT term_id, meta_key, meta_value 
FROM www_termmeta 
WHERE term_id IN (25,9,14,22) 
ORDER BY meta_id ASC
0.2501
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 = 24
0.3998
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
0.2980
SELECT SQL_CALC_FOUND_ROWS www_comments.comment_ID 
FROM www_comments 
WHERE ( comment_approved = '1' ) 
AND comment_post_ID = 1303 
AND comment_parent = 0 
ORDER BY www_comments.comment_date_gmt ASC, www_comments.comment_ID ASC
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/single.php
[18] => themes/busiprof/header.php
[19] => themes/busiprof/index-bannerstrip.php
[20] => themes/busiprof/content.php
[21] => themes/busiprof/comments.php
[22] => themes/busiprof/sidebar.php
[23] => themes/busiprof/footer.php
Globals
$_GET = array (
);

$_POST = array (
);

$_COOKIE = array (
);

$_SESSION = array (
);

$_SERVER = array (
  'SERVER_SOFTWARE' => 'Apache',
  'REQUEST_URI' => '/2019/11/21/mqtt-protocol/',
  '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' => '/2019/11/21/mqtt-protocol/',
  'REMOTE_PORT' => '48046',
  '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' => '18.234.255.5',
  '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' => '942146875',
  'HTTP_ACCEPT_ENCODING' => 'gzip',
  'HTTP_HOST' => 'www.ats-skpdatait.dk',
  'HTTP_X_ONECOM_HOST' => 'ats-skpdatait.dk',
  'HTTP_X_FORWARDED_PROTO' => 'https',
  'HTTP_X_ONECOM_FORWARDED_PROTO' => 'https',
  'HTTP_X_FORWARDED_FOR' => '18.234.255.5',
  '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_WP_ADDONS_API' => 'https://wpapi.one.com',
  'ONECOM_WEBSHOP_HOST' => 'webshop1.cst.webpod11-cph3.one.com',
  '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_WP_ADDONS_API' => 'https://wpapi.one.com',
  'REDIRECT_ONECOM_WEBSHOP_HOST' => 'webshop1.cst.webpod11-cph3.one.com',
  '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' => 1606304390.150557041168212890625,
  'REQUEST_TIME' => 1606304390,
  'ONECOM_CLIENT_IP' => '18.234.255.5',
);

Close