{"id":97698,"date":"2020-10-20T20:42:23","date_gmt":"2020-10-20T18:42:23","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/obzor-setevyh-protokolov-i-protokolov-obmena-soobshheniyami-dlya-iot"},"modified":"2020-10-20T20:42:23","modified_gmt":"2020-10-20T18:42:23","slug":"obzor-setevyh-protokolov-i-protokolov-obmena-soobshheniyami-dlya-iot","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/obzor-setevyh-protokolov-i-protokolov-obmena-soobshheniyami-dlya-iot","title":{"rendered":"\u00dclevaade v\u00f5rgu protokollidest ja s\u00f5numivahetuse protokollidest IoT jaoks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><strong><em>Tere, hubrolased!&nbsp;<\/em><\/strong><noindex><a rel=\"nofollow\" href=\"https:\/\/otus.pw\/dnQ0\/\"><strong><em>Eestis esimene IoT-arendaja veebikursus<\/em><\/strong><\/a><\/noindex><strong><em>&nbsp;algab OTUSes juba oktoobris. Just n\u00fc\u00fcd on kursusele registreerimine avatud, seet\u00f5ttu jagame teiega kasulikke materjale.<\/em><\/strong><\/p>\n<p><img decoding=\"async\" alt=\"\u00dclevaade v\u00f5rgu protokollidest ja s\u00f5numivahetuse protokollidest IoT jaoks\" src=\"\/wp-content\/uploads\/2020\/10\/eae09a35084d8a75a89c22845b0d1c1f.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Asjade internet (IoT, Internet of Things) ehitatakse olemasoleva v\u00f5rguinfrastruktuuri, tehnoloogiate ja protokollide p\u00f5hjal, mida kasutatakse praegu kodudes\/ kontorites ja Internetis, pakkudes palju muud.<\/p>\n<p>Selle juhendi eesm\u00e4rk on anda l\u00fchike \u00fclevaade IoT v\u00f5rgu- ja rakenduse protokollidest.<\/p>\n<p>M\u00e4rkus. Teil peavad olema teadmised <noindex><a rel=\"nofollow\" href=\"http:\/\/www.steves-internet-guide.com\/networking\/\"><u>v\u00f5rgetehnoloogia alustest<\/u><\/a><\/noindex>.<\/p>\n<h4>IoT-v\u00f5rgud<\/h4>\n<p>IoT t\u00f6\u00f6tab olemasolevates TCP\/IP-v\u00f5rkudes.<\/p>\n<p>TCP\/IP kasutab neljatase mudelit kindlate protokollidega igal tasemel. Vaata. <noindex><a rel=\"nofollow\" href=\"http:\/\/www.steves-internet-guide.com\/internet-protocol-suite-explained\/\"><u>understanding the TCP\/IP 4 layer model<\/u><\/a><\/noindex> (neljatase mudel TCP\/IP m\u00f5istmine).<\/p>\n<p>Alloleval diagrammil on v\u00f5rreldud praegu kasutatavaid protokolle ja neid, mida t\u00f5en\u00e4oliselt kasutatakse IoT-s.<\/p>\n<p><img decoding=\"async\" alt=\"\u00dclevaade v\u00f5rgu protokollidest ja s\u00f5numivahetuse protokollidest IoT jaoks\" src=\"\/wp-content\/uploads\/2020\/10\/d8ab9d850cbff804a444ebad7f969547.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>M\u00e4rkused diagrammile:<\/p>\n<ol>\n<li>\n<p>Fondisuurus n\u00e4itab protokolli populaarsuse astet. N\u00e4iteks on vasakul IPv4 suurem, kuna see on kaasaegses Internetis palju populaarsem. Siiski on paremal see v\u00e4iksem, kuna oodatakse, et IPv6 on IoT-s rohkem populaarne.<\/p>\n<\/li>\n<li>\n<p>Kuvatud ei ole k\u00f5iki protokolle.<\/p>\n<\/li>\n<li>\n<p>K\u00f5ige rohkem muutusi toimub kanalitasemel (tasemed 1 ja 2) ja rakendustasemetel (tase 4).<\/p>\n<\/li>\n<li>\n<p>V\u00f5rk ja transportimise tasemed t\u00f5en\u00e4oliselt j\u00e4\u00e4vad muutumatuks.<\/p>\n<\/li>\n<\/ol>\n<h4>Kanalitaseme protokollid<\/h4>\n<p>Kanalitasemel (Data Link) peate seadmed omavahel \u00fchendama. Need v\u00f5ivad asuda nii l\u00e4hedal, n\u00e4iteks kohalikes v\u00f5rkudes, kui ka kaugel \u00fcksteisest: linnalistes (metropolitan area networks) ja globaalsetes v\u00f5rkudes (wide area networks).<\/p>\n<p>Praegu kasutatakse sellel tasemel kodu- ja kontoriv\u00f5rkudes (LAN) Etherneti ja Wi-Fi-d, samas kui mobiilsetes (WAN) - 3G \/ 4G. Siiski on paljusid IoT-seadmeid madala v\u00f5imsusega, n\u00e4iteks andurid, ja need toimivad ainult patareide abil. Nendel juhtudel ei sobi Ethernet, kuid n\u00f5rgalt v\u00f5imendatud Wi-Fi ja n\u00f5rgalt v\u00f5imendatud Bluetooth v\u00f5ivad toimida.<\/p>\n<p>Kuigi nende seadmete \u00fchendamiseks kasutatakse endiselt olemasolevaid traadita tehnoloogiaid (Wi-Fi, Bluetooth, 3G \/ 4G), tasub m\u00e4rkida ka uusi tehnoloogiaid, mis on spetsiaalselt loodud IoT rakenduste jaoks, mille populaarsus t\u00f5en\u00e4oliselt kasvab.<\/p>\n<p>Nende hulgas:<\/p>\n<ul>\n<li>\n<p>BLE \u2013 Bluetooth madala energiaga<\/p>\n<\/li>\n<li>\n<p>LoRaWAN \u2013 pikas ulatuses WAN<\/p>\n<\/li>\n<li>\n<p>SigFox<\/p>\n<\/li>\n<li>\n<p>LTE-M<\/p>\n<\/li>\n<\/ul>\n<p>T\u00e4psemalt on need kirjeldatud artiklis <noindex><a rel=\"nofollow\" href=\"http:\/\/www.steves-internet-guide.com\/iot-wireless-technologies\/\"><u>\u00dclevaade IoT traadita tehnoloogiatest<\/u><\/a><\/noindex> (\u00fclevaade IoT traadita tehnoloogiatest).<\/p>\n<h4>V\u00f5rgutasand<\/h4>\n<p>V\u00f5rgutasandi (Networking) osas domineerib pikaajalises perspektiivis protokoll <noindex><a rel=\"nofollow\" href=\"http:\/\/www.steves-internet-guide.com\/ipv6-guide\/\"><u>IPv6<\/u><\/a><\/noindex>. IPv4 kasutamine tundub ebat\u00f5en\u00e4oline, kuid see v\u00f5ib m\u00e4ngida teatud rolli esimestel etappidel. Enamik koduakna IoT seadmeid, nagu n\u00e4iteks nutikad lambid, kasutavad hetkel IPv4.<\/p>\n<h4>Transporttase&nbsp;<\/h4>\n<p>Transporttasandil (Transport) domineerib Internetis ja veebis TCP. Seda kasutatakse nii HTTP-s kui ka paljudes teistes populaarsetes Interneti protokollides (SMTP, POP3, IMAP4 jne).<\/p>\n<p>MQTT, mis, nagu ma ootan, saab olema \u00fcks peamisi rakendustaseme protokolle s\u00f5numite saatmiseks, kasutab hetkel TCP-d.<\/p>\n<p>Kuid tulevikus prognoosin, et madalamate kulude t\u00f5ttu muutub UDP IoT jaoks populaarsemaks. T\u00f5en\u00e4oliselt laieneb <noindex><a rel=\"nofollow\" href=\"http:\/\/www.steves-internet-guide.com\/mqtt-sn\/\"><u>MQTT-SN<\/u><\/a><\/noindex>, mis t\u00f6\u00f6tab UDP peal. Vaata artiklit <noindex><a rel=\"nofollow\" href=\"http:\/\/www.steves-internet-guide.com\/tcp-vs-udp\/\"><u>TCP vs UDP<\/u><\/a><\/noindex> .<\/p>\n<h4>Rakendustase ja s\u00f5numivahetuse protokollid<\/h4>\n<p>Olulised omadused IoT protokollide jaoks:<\/p>\n<ul>\n<li>\n<p>Kiirus \u2014 andmete edastamise hulk sekundis.<\/p>\n<\/li>\n<li>\n<p>Viivitus \u2014 aeg, mis on vajalik s\u00f5numi edastamiseks.<\/p>\n<\/li>\n<li>\n<p>Energiatarve.<\/p>\n<\/li>\n<li>\n<p>Turvalisus.<\/p>\n<\/li>\n<li>\n<p>Tarkvarade k\u00e4ttesaadavus.<\/p>\n<\/li>\n<\/ul>\n<p>Praegu kasutatakse sellel tasemel aktiivselt kahte peamist protokolli: HTTP ja MQTT.<\/p>\n<p>HTTP on t\u00f5en\u00e4oliselt selle taseme k\u00f5ige tuntum protokoll, mis on veebide (WWW) alus. See j\u00e4\u00e4b IoT jaoks endiselt oluliseks, kuna seda kasutatakse REST API-de jaoks \u2014 peamine mehhanism veebirakenduste ja teenuste suhtlemiseks. Siiski, k\u00f5rgete kulude t\u00f5ttu ei saa HTTP t\u00f5en\u00e4oliselt olema peamine IoT protokoll, kuigi seda kasutatakse endiselt laialdaselt Internetis.<\/p>\n<p>MQTT (Message Queuing Telemetry Transport) on muutunud peamiseks s\u00f5numivahetuse protokolliks IoT-s, t\u00e4nu oma kergusele ja lihtsusele. Vaata artiklit <noindex><a rel=\"nofollow\" href=\"http:\/\/www.steves-internet-guide.com\/mqtt\/\"><u>Introduction to MQTT for beginners<\/u><\/a><\/noindex> (MQTT sissejuhatus algajatele).<\/p>\n<p>HTTP ja MQTT v\u00f5rdlemine IoT jaoks<\/p>\n<p>MQTT saab kiiresti de facto standardiks IoT-rakendustes. Selle p\u00f5hjuseks on selle kergus ja kiirus v\u00f5rreldes HTTP-ga ning asjaolu, et see on protokoll \u201e\u00fcks paljudele\u201d, mitte \u201e\u00fcks \u00fchele\u201d (HTTP).<\/p>\n<p>Paljud kaasaegsed veebirakendused kasutaksid r\u00f5\u00f5muga MQTT-d HTTP asemel, kui see oleks olnud nende arendamise ajal saadaval.<\/p>\n<p>Hea n\u00e4ide on teabe edastamine paljudele klientidele, n\u00e4iteks rongide, busside v\u00f5i lennukite saabumise ja lahkumise kohta. Sellises stsenaariumis on \u201e\u00fcks-\u00fchele\u201d protokoll, nagu HTTP, suure \u00fclekoormusega ja p\u00f5hjustab suure koormuse veebiserveritele. Nende veebiserverite skaleerimine v\u00f5ib olla keeruline. MQTT puhul \u00fchenduvad kliendid vahendajaga, keda on lihtne lisada koormuse tasakaalustamiseks. Vaata seda \u00f5petust koos videoga. <noindex><a rel=\"nofollow\" href=\"http:\/\/www.steves-internet-guide.com\/republish-html-data-over-mqtt-flight-arrivals\/\"><u>HTML andmete uuesti avaldamine MQTT kaudu (lendude saabumise n\u00e4ide)<\/u><\/a><\/noindex> ja artikkel <noindex><a rel=\"nofollow\" href=\"https:\/\/medium.com\/mqtt-buddy\/mqtt-vs-http-which-one-is-the-best-for-iot-c868169b3105\"><u>MQTT vs HTTP IoT jaoks<\/u><\/a><\/noindex>.<\/p>\n<h4>Muud s\u00f5numiteed<\/h4>\n<p>HTTP ei olnud m\u00f5eldud IoT rakendusteks, kuid nagu juba mainitud, kasutatakse seda laialdaselt veel m\u00f5nda aega t\u00e4nu selle laiale kasutusele <noindex><a rel=\"nofollow\" href=\"http:\/\/www.steves-internet-guide.com\/iot-apis\/\"><u>API<\/u><\/a><\/noindex>.<\/p>\n<p>Peaaegu k\u00f5ik IoT platvormid toetavad nii HTTP-d kui ka MQTT-d.<\/p>\n<p>Siiski on ka teisi protokolle, mida tasub kaaluda.<\/p>\n<p>Protokollid<\/p>\n<ul>\n<li>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/MQTT\"><u>MQTT<\/u><\/a><\/noindex> \u2014 (Message Queuing Telemetry Transport). Kasutab TCP\/IP-d. Mudeli \u201ev\u00e4ljaandja-tellija\u201d jaoks on vajalik s\u00f5numite vahendaja.<\/p>\n<\/li>\n<li>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Advanced_Message_Queuing_Protocol\"><u>AMQP<\/u><\/a><\/noindex> \u2014 (Advanced Message Queuing Protocol). Kasutab TCP\/IP-d. Mudelid \u201ev\u00e4ljaandja-tellija\u201d ja \u201epunkt-punkt\u201d.<\/p>\n<\/li>\n<li>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Constrained_Application_Protocol\"><u>COAP<\/u><\/a><\/noindex> \u2014 (Constrained Application Protocol). Kasutab UDP-d. On spetsiaalselt v\u00e4lja t\u00f6\u00f6tatud IoT jaoks, kasutab HTTP sarnast p\u00e4ringu-vastuse mudelit. <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc7252\"><u>RFC 7252<\/u><\/a><\/noindex>.<\/p>\n<\/li>\n<li>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Data_Distribution_Service\"><u>DDS<\/u><\/a><\/noindex> \u2014 (Data Distribution Service)&nbsp;<\/p>\n<\/li>\n<\/ul>\n<p>Selles <noindex><a rel=\"nofollow\" href=\"http:\/\/electronicdesign.com\/iot\/understanding-protocols-behind-internet-things\"><u>artiklis<\/u><\/a><\/noindex> vaadeldakse peamised protokollid ja nende rakendused. Selle artikli j\u00e4reldus on, et IoT kasutab protokollide kogumit, s\u00f5ltuvalt nende kavandatud kasutusest.<\/p>\n<p>Kuid kui tagasi vaadata, siis Interneti varajastel aastatel oli protokoll HTTP, mis hiljem sai domineerivaks, vaid \u00fcks paljusid protokolle.<\/p>\n<p>Kuigi HTTP-d ei kavandatud algselt failide ja e-posti edastamiseks, kasutatakse seda t\u00e4na m\u00f5lemal eesm\u00e4rgil.<\/p>\n<p>Ootan, et IoT s\u00f5numiteedega juhtub sama: enamik teenuseid kasutavad \u00fcht domineerivat protokolli.<\/p>\n<p>Allpool on Google Trends\u2019i graafikud, mis n\u00e4itavad, kuidas on MQTT, COAP ja AMQP populaarsus muutunud viimastel aastatel.<\/p>\n<h4>Google Trendsi \u00fclevaade&nbsp;<\/h4>\n<p><img decoding=\"async\" alt=\"\u00dclevaade v\u00f5rgu protokollidest ja s\u00f5numivahetuse protokollidest IoT jaoks\" src=\"\/wp-content\/uploads\/2020\/10\/9770888f448395448ac30b407b648e18.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Protokollide toetus platvormide kaupa<\/p>\n<ul>\n<li>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/docs.microsoft.com\/en-us\/azure\/iot-hub\/iot-hub-protocol-gateway\"><u>Microsoft Azure<\/u><\/a><\/noindex> \u2014 MQTT, AMQP, HTTP ja HTTPS<\/p>\n<\/li>\n<li>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/docs.aws.amazon.com\/iot\/latest\/developerguide\/protocols.html\"><u>AWS<\/u><\/a><\/noindex> \u2014 MQTT, HTTPS, MQTT veebivahendite kaudu<\/p>\n<\/li>\n<li>\n<p>IBM Bluemix \u2013 MQTT, HTTPS, MQTT<\/p>\n<\/li>\n<li>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/www.ni.com\/en-us\/innovations\/white-papers\/17\/a-practical-guide-for-connecting-labview-to-the-industrial-iot.html#section--269124710\"><u>Thingworx<\/u><\/a><\/noindex> \u2014 MQTT, HTTPS, MQTT, AMQP<\/p>\n<\/li>\n<\/ul>\n<h4>Elulookirjeldus<\/h4>\n<p>K\u00f5ige rohkem muutusi toimub kanalitasemel (tasemed 1 ja 2) ja rakendustasemetel (tase 4).<\/p>\n<p>V\u00f5rk ja transportimise tasemed t\u00f5en\u00e4oliselt j\u00e4\u00e4vad muutumatuks.<\/p>\n<p>Rakendustasandil kasutavad IoT komponendid s\u00f5numivahetusprotokolle. Kuigi oleme endiselt IoT arengus varases etapis, on t\u00f5en\u00e4oline, et eristub \u00fcks v\u00f5i kaks s\u00f5numivahetusprotokolli.<\/p>\n<p>Viimase paari aasta jooksul on MQTT saanud k\u00f5ige populaarsemaks ning sellele keskendun ma praegu ka sellel lehel.<\/p>\n<p>HTTP j\u00e4\u00e4b samuti kasutusele, kuna see on juba h\u00e4sti integreeritud olemasolevatesse IoT platvormidesse.<\/p>\n<blockquote>\n<p>Sellega on k\u00f5ik. Kutsume teid registreeruma tasuta demoklassile teemal <noindex><a rel=\"nofollow\" href=\"https:\/\/otus.pw\/dnQ0\/\">\u201eKiire k\u00e4skude seadme juturobot\u201c<\/a><\/noindex>.<\/p>\n<\/blockquote>\n<h4>Loe edasi:<\/h4>\n<ul>\n<li>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/otus\/blog\/521788\/\">Miks on kaitsmata tarbijate IoT s\u00fcsteemid n\u00fc\u00fcd t\u00f5sine \u00e4riprobleem<\/a><\/noindex><\/p>\n<\/li>\n<\/ul>\n<h2><\/h2>\n<\/p>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/otus\/blog\/524140\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0438\u0432\u0435\u0442, \u0445\u0430\u0431\u0440\u043e\u0432\u0447\u0430\u043d\u0435!&nbsp;\u041f\u0435\u0440\u0432\u044b\u0439 \u0432 \u0420\u043e\u0441\u0441\u0438\u0438 \u043e\u043d\u043b\u0430\u0439\u043d-\u043a\u0443\u0440\u0441 IoT-\u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a&nbsp;\u0441\u0442\u0430\u0440\u0442\u0443\u0435\u0442 \u0432 OTUS \u0443\u0436\u0435 \u0432 \u043e\u043a\u0442\u044f\u0431\u0440\u0435. \u041f\u0440\u044f\u043c\u043e \u0441\u0435\u0439\u0447\u0430\u0441 \u043e\u0442\u043a\u0440\u044b\u0442 \u043d\u0430\u0431\u043e\u0440 \u043d\u0430 \u043a\u0443\u0440\u0441, \u0432 \u0441\u0432\u044f\u0437\u0438 \u0441 \u0447\u0435\u043c \u043c\u044b \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0430\u0435\u043c \u0434\u0435\u043b\u0438\u0442\u044c\u0441\u044f \u0441 \u0432\u0430\u043c\u0438 \u043f\u043e\u043b\u0435\u0437\u043d\u044b\u043c\u0438 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u0430\u043c\u0438. \u0418\u043d\u0442\u0435\u0440\u043d\u0435\u0442 \u0432\u0435\u0449\u0435\u0439 (IoT, Internet of Things) \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d \u043d\u0430 \u0431\u0430\u0437\u0435 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