{"id":94,"date":"2020-11-05T09:55:33","date_gmt":"2020-11-05T01:55:33","guid":{"rendered":"https:\/\/www.db2go.net\/?p=94"},"modified":"2020-11-05T09:55:33","modified_gmt":"2020-11-05T01:55:33","slug":"mqtt-vs-coap","status":"publish","type":"post","link":"https:\/\/www.db2go.net\/?p=94","title":{"rendered":"MQTT Vs CoAP"},"content":{"rendered":"<h1>\u57fa\u7840\u901a\u4fe1\u534f\u8bae<\/h1>\n<p>\u57fa\u7840\u901a\u4fe1\u534f\u8bae\u65b9\u9762\u6709\u4e24\u4e2a\u4e13\u95e8\u7684\u7ade\u4e89\u534f\u8bae\uff1a\u6d88\u606f\u961f\u5217\u9065\u6d4b\u4f20\u8f93( MQTT )\uff0c\u548c\u53d7\u7ea6\u675f\u7684\u5e94\u7528\u534f\u8bae(CoAP)\u3002<\/p>\n<p>\u5b83\u4eec\u90fd\u8bbe\u8ba1\u4e3a\u8f7b\u91cf\u7ea7\uff0c\u5e76\u4ed4\u7ec6\u4f7f\u7528\u7a00\u7f3a\u7684\u7f51\u8def\u8d44\u6e90\u3002\u4e24\u8005\u90fd\u5728\u6b63\u786e\u7684\u73af\u5883\u4e2d\u4f7f\u7528\uff0c\u4f46\u95ee\u9898\u662f\uff0c\u7531\u4e8e\u7269\u8054\u7f51\u7684\u5feb\u901f\u53d1\u5c55\uff0c\u4e00\u822c\u4eba\u4eec\u4e0d\u77e5\u9053\u8fd9\u4e9b\u534f\u8bae\u662f\u4ec0\u4e48\uff1f\u6216\u4f55\u65f6\u4f7f\u7528\uff1f<br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_970211f9a396424297887719b61a30a1.jpg\"><img decoding=\"async\" src=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_970211f9a396424297887719b61a30a1.jpg\" alt=\"\" \/><\/a><\/p>\n<h1>\u4ec0\u4e48\u662fMQTT<\/h1>\n<p>MQTT\u7684\u5168\u540d\u4e3a<code>Message Queuing Telemetry Transport<\/code>\uff0c\u4e3aIBM\u548cEurotech\u5171\u540c\u5236\u5b9a\u51fa\u6765\u7684protocol\uff0c\u5728MQTT\u7684\u5b98\u7f51\u53ef\u4ee5\u770b\u5230\u4e00\u5f00\u59cb\u5b83\u5bf9MQTT\u7684\u4ecb\u7ecd\uff1a<\/p>\n<blockquote><p>\n  http:\/\/mqtt.org\/<br \/>\n  MQTT is a machine-to-machine (M2M)\/&#8221;Internet of Things&#8221; connectivity protocol. It was designed as an extremely lightweight publish\/subscribe messaging transport.\n<\/p><\/blockquote>\n<p>\u7b80\u5355\u6765\u8bf4\uff0c\u5b83\u662f\u4e3a\u4e86\u7269\u8054\u7f51\u800c\u8bbe\u8ba1\u7684protocol\uff0c\u5e76\u4e14\u5b83\u662f\u900f\u8fc7publish\/subscribe\u7684\u65b9\u5f0f\u6765\u505a\u8baf\u606f\u4f20\u9001\u3002\u7531\u4e8e\u662f\u4e3a\u4e86\u7269\u8054\u7f51\u800c\u8bbe\u8ba1\u7684\u534f\u5b9a\uff0c\u56e0\u6b64\u5b83\u6240\u9700\u8981\u7684\u7f51\u8def\u9891\u5bbd\u662f\u5f88\u4f4e\u7684\uff0c\u800c\u6240\u9700\u8981\u7684\u786c\u4f53\u8d44\u6e90\u4e5f\u662f\u4f4e\u7684\u3002<\/p>\n<p>MQTT\u5f88\u50cfTwitter\u3002\u8fd9\u662f\u4e00\u4e2a\u300c\u53d1\u5e03\u548c\u8ba2\u9605\u300d\u534f\u8bae\u3002<\/p>\n<p>Publish\/Subscribe\uff1a<br \/>\n\u5728\u770bMQTT\u4e4b\u524d\uff0c\u6700\u597d\u8981\u5148\u77e5\u9053Publish\/Subscribe\u7684\u8baf\u606f\u4f20\u9001\u673a\u5236\u4e3a\u4f55\uff0c\u8fd9\u6837\u4e4b\u540e\u5728\u770b\u5176\u534f\u5b9a\u65f6\uff0c\u624d\u4f1a\u66f4\u5feb\u4e0a\u624b\u3002<\/p>\n<p>Publish\/Subscribe\u6709\u4e09\u79cd\u4e3b\u8981\u7684\u7ec4\u6210\u5143\u4ef6\uff0c\u5206\u522b\u4e3aPublisher\u3001Subscriber\u4ee5\u53caTopic\u3002<\/p>\n<p>Publisher\u4e3a\u8baf\u606f\u7684\u6765\u6e90\uff0c\u5b83\u4f1a\u5c06\u8baf\u606f\u53d1\u9001\u7ed9Topic\uff0c\u800cSubscriber\u5411Topic\u6ce8\u518c\uff0c\u8868\u793a\u4ed6\u4eec\u60f3\u8981\u63a5\u6536\u6b64Topic\u7684\u8baf\u606f\uff1b\u56e0\u6b64\u5f53\u6709\u67d0\u4e2aPublisher\u5bf9Topic\u53d1\u9001\u8baf\u606f\u65f6\uff0c\u53ea\u8981\u662f\u6709\u5bf9\u6b64Topic\u6ce8\u518c\u7684Subscriber\uff0c\u90fd\u4f1a\u6536\u5230\u6b64\u5219\u8baf\u606f\u3002<\/p>\n<p>\u5b83\u4eec\u7684\u5173\u7cfb\u5982\u4e0b\u56fe\uff1a<br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_58df29eb39f1d15e541ae6d71bf3c5dc.jpg\"><img decoding=\"async\" src=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_58df29eb39f1d15e541ae6d71bf3c5dc.jpg\" alt=\"\" \/><\/a><\/p>\n<p>MQTT\u7279\u6027<br \/>\n\u4e86\u89e3\u4e86Publish\/Subscribe\u7684\u673a\u5236\u4e4b\u540e\uff0c\u63a5\u7740\u770b\u770bMQTT\u6709\u54ea\u4e9b\u7279\u6027\uff1a<\/p>\n<ol>\n<li>Publish\/Subscribe\u7684\u8baf\u606f\u4f20\u9001\u6a21\u5f0f\uff0c\u6765\u63d0\u4f9b\u4e00\u5bf9\u591a\u7684\u8baf\u606f\u5206\u914d\u3002<\/li>\n<li>\u4f7f\u7528TCP\/IP\u6765\u63d0\u4f9b\u57fa\u672c\u7684\u7f51\u8def\u8fde\u7ed3\u3002<\/li>\n<li>\u4e09\u79cd\u8baf\u606f\u4f20\u9001\u670d\u52a1\u7684qualities\uff1a\n<ul>\n<li>&#8220;At most once&#8221;\uff0c\u6700\u591a\u4e00\u6b21\uff0c\u8baf\u606f\u9057\u5931\u6216\u662f\u91cd\u590d\u53d1\u9001\u7684\u72b6\u51b5\u53ef\u80fd\u4f1a\u53d1\u751f\uff1b\u8fd9\u79cdquality\u9002\u5408\u5e94\u7528\u5728\u73af\u5883\u611f\u6d4b\uff0c\u4e0d\u5728\u610f\u8d44\u6599\u662f\u5426\u4f1a\u9057\u5931\uff0c\u56e0\u4e3a\u4e0b\u4e00\u6b21\u7684\u8d44\u6599\u53d6\u6837\u5f88\u5feb\u5c31\u4f1a\u88abpublished\u51fa\u6765\u3002<\/li>\n<li>&#8220;At least once&#8221;\uff0c\u81f3\u5c11\u4e00\u6b21\uff0c\u8fd9\u79cdquality\u4fdd\u8bc1\u8baf\u606f\u4f1a\u9001\u8fbe\uff0c\u53ea\u662f\u53ef\u80fd\u4f1a\u53d1\u751f\u91cd\u590d\u53d1\u9001\u8baf\u606f\u7684\u72b6\u51b5\u3002<\/li>\n<li>&#8220;Exactly once&#8221;\uff0c\u786e\u5b9a\u4e00\u6b21\uff0c\u786e\u8ba4\u8baf\u606f\u53ea\u4f1a\u9001\u5230\u4e00\u6b21\u3002\u8fd9\u79cdquality\u9002\u5408\u7528\u5728\u8ba1\u8d39\u7cfb\u7edf\uff0c\u7cfb\u7edf\u53ea\u8981\u6709\u91cd\u590d\u6536\u5230\u8d44\u6599\u3001\u6216\u662f\u8d44\u6599\u9057\u5931\u72b6\u51b5\u53d1\u751f\uff0c\u5c31\u4f1a\u9020\u6210\u7cfb\u7edf\u9519\u8bef\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u7531\u4e8e\u4ed6\u7684header\u56fa\u5b9a\u957f\u5ea6\u4e3a2byte\uff0c\u56e0\u6b64\u53ef\u4ee5\u51cf\u5c11\u5c01\u5305\u4f20\u9001\u65f6\u7684\u989d\u5916\u8d1f\u8f7d\uff0c\u5e76\u51cf\u5c11\u6240\u9700\u7684\u7f51\u8def\u9891\u5bbd\u3002<\/li>\n<li>\u5f53\u5f02\u5e38\u65ad\u7ebf\u53d1\u751f\u65f6\uff0c\u4f1a\u4f7f\u7528\u6700\u540e\u9057\u5631(Last Will and Testament)\u7684\u673a\u5236\uff0c\u901a\u77e5\u5404\u4e2a\u611f\u5174\u8da3\u7684client\u3002<\/li>\n<\/ol>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_1e65577859534d0c37753f6468f70915.jpg\"><img decoding=\"async\" src=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_1e65577859534d0c37753f6468f70915.jpg\" alt=\"\" \/><\/a><\/p>\n<p>MQTT\u73b0\u51b5\uff1a<br \/>\nMQTT\u73b0\u9636\u6bb5\uff0c\u5e76\u4e0d\u662f\u4e00\u4e2a\u6807\u51c6\u5316\u7684Protocol\uff0c\u8fd8\u5728\u6301\u7eed\u6539\u8fdb\u4e2d\uff0c\u76ee\u524d\u4e3aMQTT V3.1\u3002\u4e0d\u8fc7IBM\u5df2\u4e8e2013\u5e74\uff0c\u5df2\u7ecf\u5c06\u5b83\u4ea4\u7ed9OASIS\u8fdb\u884c\u6807\u51c6\u5316\u4e86\uff0c\u5e76\u4e14\u4e00\u76f4\u4ee5\u6765IBM\u5bf9\u6b64\u534f\u5b9a\u91c7\u5f00\u653e\u3001\u514d\u6388\u6743\u8d39\u7684\u65b9\u5f0f\uff0c\u8ba9\u5b83\u80fd\u591f\u88ab\u6563\u5e03\uff0c\u56e0\u6b64\u76f8\u4fe1\u4e0d\u4e45\u7684\u5c06\u6765\uff0c\u4f1a\u6210\u4e3a\u4e00\u4e2a\u4e3b\u6d41\u7684Protocol\u3002<\/p>\n<p>\u800c\u76ee\u524d\u652f\u63f4MQTT\u7684Client API\uff0c\u6709Eclipse Phno Project\u6709\u5bf9MQTT client\u652f\u63f4\uff0c\u5176\u652f\u63f4C\u3001Java\u3001Javascript\u3001C++\u7b49\u7b49\u7684\u8bed\u8a00\uff0c\u53ef\u8bf4\u662f\u652f\u63f4\u5ea6\u5f88\u9ad8\u7684Project\u3002\u800c\u76ee\u524d\u5df2\u7ecf\u5728\u5e94\u7528MQTT\u7684\uff0c\u6700\u77e5\u540d\u7684\u5e94\u8be5\u5c31\u662fFacebook Message App\u4e86\u5427\uff0c\u53ef\u4ee5\u53c2\u8003\u6b64\u7bc7\u6587\u7ae0\u3002<\/p>\n<p>\u5c0f\u7ed3\uff1a<br \/>\n\u4e0a\u9762\u63d0\u5230\u7684\uff0c\u4f4e\u9891\u5bbd\u3001\u4f4e\u786c\u4f53\u9700\u6c42\u7684\u7279\u6027\uff0c\u8baf\u606f\u4f20\u9012\u4e3aPublish\/Subscribe\u7684\u65b9\u5f0f\uff0c\u6b63\u597d\u53ef\u4ee5\u7528\u6765\u5b9e\u73b0Push Notification\u7684\u673a\u5236\uff0c\u5e76\u4e14\u80fd\u8fbe\u5230\u624b\u6301\u88c5\u7f6e\u7701\u7535\u7684\u9700\u6c42\uff0c\u63a5\u4e0b\u6765\u4f1a\u5148\u4ece\u5176Protocol\u5f00\u59cb\u4e86\u89e3\uff0c\u5e76\u7528Client Api\u8dd1\u4e9b\u8303\u4f8b\u6765\u5e94\u7528\u6b64Protocol\u3002<\/p>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_be61da7879424936c8ce93d5caeec1b0.jpg\"><img decoding=\"async\" src=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_be61da7879424936c8ce93d5caeec1b0.jpg\" alt=\"\" \/><\/a><\/p>\n<h1>\u4ec0\u4e48\u662fCoAP<\/h1>\n<p>CoAP(<code>The Constrained Application Protocol<\/code>) \u76ee\u524d\u5df2\u662fIETF\u6807\u51c6(RFC 7252) \uff0c\u63d0\u51fa\u4e00\u4e2a\u7c7b\u4f3cHTTP\/TCP\u8bbe\u8ba1\uff0c\u4f46\u662f\u5c5e\u4e8e\u8f7b\u91cf\u7248\u7684HTTP\/UDP\uff0c\u4f7f\u5f97\u5176\u6709\u5229\u4e8e\u611f\u6d4b\u8282\u70b9\u8fdb\u884c\u7f51\u8def\u4f20\u8f93\u3002<\/p>\n<p>CoAP\u4e3b\u8981\u7279\u70b9\uff1a<br \/>\n1. CoAP\u662f\u4e3b\u4ece(Client\/Server)\u67b6\u6784\uff0c\u611f\u6d4b\u8282\u70b9\u591a\u534a\u4e3aCoAP Server\u63d0\u4f9b\u8d44\u6e90\uff0c\u7531CoAP Client\u8bf7\u6c42\u8bfb\u53d6\/\u63a7\u5236\u8d44\u6e90\u72b6\u6001\u3002CoAP\u4f7f\u7528UDP (port: 5683)\uff0c\u5bf9\u4e8e\u8d44\u6599\u662f\u5426\u8981\u91cd\u4f20\u6216\u4f20\u9001\u987a\u5e8f(Reordering)\u5168\u4ea4\u7531\u4e0a\u5c42\u5e94\u7528\u5c42\u6765\u51b3\u5b9a\uff0c\u5bf9\u4e8e\u8d44\u6e90\u6709\u9650\u7684MCU\u5219\u4e0d\u9700\u8981\u6709\u5b8c\u6574TCP\/IP\u534f\u5b9a\u5b9e\u4f5c<br \/>\n2. \u800cCoAP\u540cHTTP\u4e00\u6837\u5177\u6709REST(Representational State Transfer)\u8bbe\u8ba1\u98ce\u683c\uff0c\u4e5f\u652f\u63f4GET\/PUT\/POST\/DELETE\u53caURIs\u7684\u8bf7\u6c42\u65b9\u5f0f\u3002<br \/>\n3. CoAP\u91c7\u7528\u4e8c\u8fdb\u4f4d\u6574\u6570\u683c\u5f0f\u4e14\u5c01\u5305\u6807\u59344\u4e2abyte\u800c\u975eHTTP\u4f7f\u7528\u5b57\u4e32\u683c\u5f0f(ASCII code)\uff0c\u6240\u4ee5\u5c01\u5305\u4f20\u9001\u65f6\u7684\u989d\u5916\u8d1f\u62c5\u5c0f\u4e14\u4e0d\u5fc5\u50cfHTTP\u4e00\u6837\u5f97\u8fdb\u884c\u8017\u65f6\u7684\u5b57\u4e32\u89e3\u6790\u5904\u7406\u3002<br \/>\n4. CoAP QoS : CoAP\u8baf\u606f\u5206\u4e3aConfirmable\u6216Non-Confirmable\u3002Confirmable\u8981\u6c42\u63a5\u6536\u7aef\u987b\u56de\u9001ACK\uff0c\u82e5\u6ca1\u6709\u6536\u5230ACK\u5219\u91cd\u9001\u4e00\u6b21\u3002\u82e5\u9001\u7684\u662fNon-Confirmable\u8baf\u606f\uff0c\u5219\u9001\u51fa\u7aef\u4e0d\u5728\u4e4e\u63a5\u6536\u7aef\u662f\u5426\u6536\u5230\u3002<br \/>\n5. CoAP\u52a0\u5bc6\u4f7f\u7528DTLS (Datagram Transport Layer Security)<br \/>\n6. \u901a\u77e5\u673a\u5236: CoAP\u6269\u5c55\u4e86HTTP GET\uff0c\u52a0\u5165\u4e86\u4e00\u4e2aobserve flag\uff0c\u4f7f\u5f97CoAP Server\u80fd\u4e3b\u52a8\u56de\u4f20\uff0cCoAP Client\u6240observe\u7684\u8d44\u6e90\u72b6\u6001\u3002<br \/>\n7. NAT Issue:\u82e5\u611f\u6d4b\u8282\u70b9\u5728NAT\u540e\u65b9\uff0c\u5219\u5fc5\u987b\u4e00\u5f00\u59cb\u5148\u9001\u51fa\u8bf7\u6c42\u5230\u5916\u90e8\uff0c\u4f7f\u8def\u7531\u5668\u53ef\u4ee5\u63a5\u53d7\u6765\u81ea\u5916\u9762CoAP Client\u7684\u8bf7\u6c42\uff0c\u4f8b\u5982\u8bf7\u6c42\u8d44\u6e90\u6e05\u5355\u3002<\/p>\n<blockquote><p>\n  DTLS\u52a0\u5bc6\u8fc7\u7a0b\u4f7f\u7528\u9884\u8bbe\u5bc6\u94a5PSK\u6216\u692d\u5706\u66f2\u7ebfDiffie-Hellman ECDH\u7b97\u6cd5\uff0c\u8fd9\u79cd\u65b9\u6cd5\u540c\u6837\u4e5f\u662fDLMS\u4e2d\u4f7f\u7528\u7684\u52a0\u5bc6\u65b9\u6cd5\u3002\u5b58\u5728\u7684\u95ee\u9898\u662f\uff0c\u5728\u4f7f\u7528ECDH\u65f6\u4f1a\u53d7\u5230DDoS\u7684\u653b\u51fb\uff0c\u4f7f\u7528\u5927\u7684\u8bc1\u4e66\u4f7f\u5f97\u670d\u52a1\u7aef\u762b\u75ea\n<\/p><\/blockquote>\n<h1>CoAP vs MQTT \u6bd4\u8f83<\/h1>\n<h2>MQTT<\/h2>\n<p>MQTT\u7684\u7279\u70b9\u662f\u53ef\u4ee5\u4fdd\u6301\u957f\u8fde\u63a5\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u5b9e\u65f6\u6027\uff0c\u4e91\u7aef\u5411\u8bbe\u5907\u7aef\u53d1\u9001\u6d88\u606f\uff0c\u8bbe\u5907\u7aef\u53ef\u4ee5\u5728\u6700\u77ed\u7684\u65f6\u95f4\u5185\u63a5\u6536\u5230\u5e76\u4f5c\u51fa\u54cd\u5e94\uff0c\u6240\u4ee5MQTT\u66f4\u9002\u5408\u9700\u8981\u5b9e\u65f6\u63a7\u5236\u7684\u573a\u5408\uff0c\u66f4\u9002\u5408\u6267\u884c\u5668\u3002\u8981\u4fdd\u6301\u957f\u8fde\u63a5\uff0c\u90a3\u4e48\u5c31\u8981\u65f6\u4e0d\u65f6\u5730\u53d1\u9001\u5fc3\u8df3\u5305\uff0c\u8fd9\u5c31\u4e0d\u4f1a\u7701\u7535\u4e86\u3002\u6240\u4ee5\u4f4e\u529f\u8017\u7684\u573a\u5408\u5e76\u4e0d\u9002\u5408MQTT\u3002MQTT\u7684\u957f\u8fde\u63a5\u9700\u8981\u5efa\u7acb\u5728TCP\u7684\u57fa\u7840\u4e0a\uff0cTCP\u534f\u8bae\u7684\u590d\u6742\u6027\u51b3\u5b9a\u4e86\u5bf9\u8bbe\u5907\u7684\u8981\u6c42\u662f\u6bd4\u8f83\u9ad8\u4e00\u4e9b\u7684\uff0c\u76f8\u6bd4UDP\u3002<\/p>\n<h2>CoAP<\/h2>\n<p>CoAP\u7684\u7279\u70b9\u662f\u4f4e\u529f\u8017\uff0c\u6570\u636e\u53d1\u5b8c\u5c31\u53ef\u4ee5\u4f11\u7720\u4e86\u3002\u6240\u4ee5CoAP\u66f4\u9002\u5408\u6570\u636e\u91c7\u96c6\u7684\u573a\u5408\uff0c\u66f4\u9002\u5408\u7eaf\u7cb9\u7684\u4f20\u611f\u5668\u8bbe\u5907\uff0c\u7279\u522b\u662f\u7535\u6c60\u4f9b\u7535\u7684\u4f20\u611f\u5668\u8bbe\u5907\u3002\u57fa\u4e8eUDP\u534f\u8bae\uff0c\u5bf9\u8bbe\u5907\u7684\u8981\u6c42\u6bd4\u8f83\u7b80\u5355\u3002\u534e\u4e3a\u51fa\u7684NB-IoT\u82af\u7247\u5c31\u53ea\u652f\u6301UDP\u548cCoAP\uff0c\u534e\u4e3a\u7684\u51b3\u7b56\u544a\u8bc9\u6211\u4eecCoAP\u548cNB-IoT\u662f\u4e00\u5bf9\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<ol>\n<li>\u90fd\u662f\u516c\u5f00\u6807\u51c6\u4e14\u90fd\u662f\u57fa\u4e8eIP\u5c42\u7684\u534f\u5b9a<\/li>\n<li>\u5c01\u5305\u6807\u5934\u5c0f\u4e14\u91c7\u7528binary\u683c\u5f0f<\/li>\n<li>CoAP\u5c5e\u4e8e\u4e00\u5bf9\u4e00\u901a\u8baf\uff0cMQTT\u5219\u662f\u591a\u5bf9\u591a<\/li>\n<li>\u82e5\u8003\u8651\u611f\u6d4b\u8282\u70b9\u5728NAT\u540e\u65b9\u7684\u60c5\u51b5\uff0c\u7531\u4e8eMQTT\u7684\u67b6\u6784\u56e0\u4e3a\u6709\u4e2d\u592ebroker\u7684\u89d2\u8272\uff0cMQTT Client\u672c\u6765\u5c31\u6301\u7eed\u8fde\u63a5\u5728broker\uff0c\u6240\u4ee5\u53ef\u4ee5\u76f4\u63a5\u63a8\u64ad\u8baf\u606f\uff0c\u6ca1\u6709NAT\u95ee\u9898\u3002<\/li>\n<li>MQTT\u662f\u591a\u4e2a\u5ba2\u6237\u7aef\u901a\u8fc7\u4e00\u4e2a\u4e2d\u592e\u4ee3\u7406\u4f20\u9012\u6d88\u606f\u7684\u591a\u5bf9\u591a\u534f\u8bae\u3002\u5b83\u901a\u8fc7\u8ba9\u5ba2\u6237\u7aef\u53d1\u5e03\u6d88\u606f\u3001\u4ee3\u7406\u51b3\u5b9a\u6d88\u606f\u8def\u7531\u548c\u590d\u5236\u6765\u89e3\u8026\u751f\u4ea7\u8005\u548c\u6d88\u8d39\u8005\u3002\u867d\u7136MQTT\u6301\u4e45\u6027\u6709\u4e00\u4e9b\u652f\u6301\uff0c\u4f46\u5b83\u662f\u6700\u597d\u7684\u5b9e\u65f6\u901a\u8baf\u603b\u7ebf\u3002<\/li>\n<li>CoAP\u57fa\u672c\u4e0a\u662f\u4e00\u4e2a\u5728Client\u548cServer\u4e4b\u95f4\u4f20\u9012\u72b6\u6001\u4fe1\u606f\u7684\u5355\u5bf9\u5355\u534f\u8bae\u3002\u867d\u7136\u5b83\u652f\u6301\u89c2\u5bdf\u8d44\u6e90\uff0c\u4f46\u662fCoAP\u6700\u9002\u5408\u72b6\u6001\u8f6c\u79fb\u6a21\u578b\uff0c\u800c\u4e0d\u662f\u5355\u7eaf\u7684\u57fa\u4e8e\u4e8b\u4ef6\u3002<\/li>\n<li>MQTT Clients\u4e0eBroker\u4e4b\u95f4\u4fdd\u6301TCP\u957f\u8fde\u63a5\uff0c\u8fd9\u4e2a\u5728NAT\u73af\u5883\u4e2d\u4e5f\u4e0d\u4f1a\u6709\u95ee\u9898\u3002CoAP Clients\u4e0eServer\u90fd\u8981\u63a5\u6536\u548c\u53d1\u9001UDP\u5305\u3002\u5728NAT\u73af\u5883\u4e0b\u4f7f\u7528CoAP\uff0c\u9700\u8981\u4f7f\u7528\u201c\u96a7\u9053\u6398\u8fdb\u201d\u6216\u8005\u7aef\u53e3\u8f6c\u53d1(\u5185\u7f51\u7a7f\u900f)\uff0c\u5426\u5219\u50cfLWM2M\uff08\u8f7b\u91cf\u7ea7M2M\uff09\u4e00\u6837\uff0c\u9996\u5148\u521d\u59cb\u5316\u8bbe\u5907\u5230\u2018\u5934\u7aef\u2019( head-end )\u7684\u8fde\u63a5.<\/li>\n<li>MQTT\u4e0d\u652f\u6301\u5e26\u6709\u7c7b\u578b\u6216\u8005\u5176\u5b83\u5e2e\u52a9Clients\u7406\u89e3\u7684\u6807\u7b7e\u6d88\u606f\u3002MQTT\u6d88\u606f\u53ef\u7528\u4e8e\u4efb\u610f\u76ee\u7684\uff0c\u4f46\u524d\u63d0\u662f\u6240\u6709\u7684Clients\u5fc5\u987b\u77e5\u9053\u6d88\u606f\u683c\u5f0f\u3002\u800cCoAP\u5219\u76f8\u53cd\uff0c\u5b83\u5185\u7f6e\u5185\u5bb9\u534f\u5546\u548c\u53d1\u73b0\u652f\u6301\uff0c\u8fd9\u6837\u5141\u8bb8\u8bbe\u5907\u5f7c\u6b64\u7aa5\u6d4b\u4ee5\u627e\u5230\u4ea4\u6362\u6570\u636e\u7684\u65b9\u5f0f\u3002<\/li>\n<\/ol>\n<table>\n<thead>\n<tr>\n<th>\u534f\u8bae<\/th>\n<th>\u6838\u5fc3\u7279\u70b9<\/th>\n<th>\u4e0b\u5c42\u534f\u8bae<\/th>\n<th>\u5e94\u7528\u573a\u5408<\/th>\n<th>\u786c\u4ef6\u8981\u6c42<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>MQTT<\/td>\n<td>\u957f\u8fde\u63a5<\/td>\n<td>TCP<\/td>\n<td>\u5b9e\u65f6\u63a7\u5236\/\u6267\u884c\u5668<\/td>\n<td>\u8f83\u9ad8<\/td>\n<\/tr>\n<tr>\n<td>CoAP<\/td>\n<td>\u4f4e\u529f\u8017<\/td>\n<td>UDP<\/td>\n<td>\u6570\u636e\u91c7\u96c6\/\u4f20\u611f\u5668<\/td>\n<td>\u8f83\u4f4e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6765\u81ea\u7f51\u4e0a\u7684\u4e00\u4e2a\u5bf9\u6bd4\uff1a<\/p>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_ca0e59bbb3b7882583ba9d33e5c6d1bd.jpg\"><img decoding=\"async\" src=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_ca0e59bbb3b7882583ba9d33e5c6d1bd.jpg\" alt=\"\" \/><\/a><\/p>\n<h2>\u7269\u8054\u7f51\u5e94\u7528\u5c42\u901a\u8baf\u534f\u5b9a\u6807\u51c6\u6bd4\u8f83<\/h2>\n<p>\u673a\u5668\u5bf9\u673a\u5668(Machine-to-Machine\uff0c M2M)\u901a\u8baf\u662f\u7269\u8054\u7f51\u7684\u4e00\u4e2a\u91cd\u8981\u8fd0\u4f5c\u6982\u5ff5\u3002\u968f\u7740\u7269\u8054\u7f51\u7684\u5e94\u7528\u65e5\u76ca\u5174\u76db\uff0cM2M\u6d41\u91cf\u4f1a\u6301\u7eed\u589e\u52a0\uff0c\u6545\u9488\u5bf9M2M Traffic\u7279\u5f81\u53ca\u5176\u5e94\u7528\uff0cM2M\u901a\u8baf\u6280\u672f\u5e94\u8fd0\u800c\u751f\u3002<\/p>\n<p>\u7531\u4e8e\u7269\u8054\u7f51\u67b6\u6784\u4e0b\uff0c\u611f\u6d4b\u8282\u70b9\u672c\u8eab\u591a\u534a\u91c7\u7528MCU\uff0c\u4e14\u4ee5\u7535\u6c60\u4f9b\u7535\uff0c\u6545\u8fd9\u4e9b\u65b0\u7684M2M\u534f\u5b9a\u5fc5\u987b\u8003\u91cf\uff0c\u5728\u6709\u9650\u7684\u786c\u4ef6\u80fd\u529b\u53ca\u529f\u8017\u7b49\u6761\u4ef6\u4e0b\uff0c\u4f7f\u5f97M2M Traffic\u5728\u8fdb\u884c\u7f51\u8def\u4f20\u8f93\u65f6\uff0c\u6709\u8f83\u9ad8\u7684Throughput\u3001\u4f4e\u5ef6\u8fdf\u3001\u4f4e\u7535\u529b\u8017\u635f\uff0c\u751a\u81f3\u63d0\u4f9b\u4e0d\u540c\u7684QoS (Quality of Service)\u3002<\/p>\n<h2>\u76ee\u524d\u5404\u5bb6\u63d0\u4f9b\u8fde\u7ed3\u7269\u8054\u7f51\u88c5\u7f6e\u7684\u4e91\u7aef\u8d44\u6599\u670d\u52a1\u5e73\u53f0<\/h2>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/aws.amazon.com\/tw\/iot\/\">AWS IoT<\/a>\u3001<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/evrythng.com\/\">Evrythng<\/a>\u3001<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.xively.com\/\">Xively<\/a>\u3001<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/thingspeak.com\/\">ThingSpeak<\/a>\u3001<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.thingworx.com\/\">ThingWorx<\/a>\u7b49\u53ca\u6676\u7247\u5382\u63d0\u4f9b\u7684\u4e91\u5e73\u53f0\uff0c\u5982\u8054\u53d1\u79d1\u7684<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/mcs.mediatek.com\/\">MCS<\/a>\u3001<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/connector.mbed.com\/\">ARM mbed Device Connector<\/a>\u7b49\uff0c\u90fd\u5e7f\u6cdb\u652f\u63f4CoAP\u53caMQTT\u534f\u5b9a\uff0c\u6545\u5c06\u9009\u62e9\u6b64\u4e24\u79cd\u534f\u5b9a\u6765\u8fdb\u884c\u8bf4\u660e\u4e0e\u6bd4\u8f83\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u901a\u4fe1\u534f\u8bae<\/th>\n<th>restful<\/th>\n<th>\u4f20\u8f93\u5c42<\/th>\n<th>publish\/subscribe<\/th>\n<th>request\/Response<\/th>\n<th>\u52a0\u5bc6<\/th>\n<th>qos<\/th>\n<th>\u5c01\u5305\u6807\u5934<\/th>\n<th>\u662f\u5426\u5f00\u6e90<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>CoAP<\/td>\n<td>\u221a<\/td>\n<td>UDP<\/td>\n<td>\u221a<\/td>\n<td>\u221a<\/td>\n<td>DTLS<\/td>\n<td>\u221a<\/td>\n<td>4<\/td>\n<td>libcoap<\/td>\n<\/tr>\n<tr>\n<td>MQTT<\/td>\n<td>\u00d7<\/td>\n<td>TCP<\/td>\n<td>\u221a<\/td>\n<td>\u00d7<\/td>\n<td>SSL<\/td>\n<td>\u221a<\/td>\n<td>2<\/td>\n<td>paho\/mosquitto\/mqtt.js\/emq<\/td>\n<\/tr>\n<tr>\n<td>HTTP<\/td>\n<td>\u221a<\/td>\n<td>TCP<\/td>\n<td>\u00d7<\/td>\n<td>\u221a<\/td>\n<td>SSL<\/td>\n<td>\u00d7<\/td>\n<td>~<\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u7136\u800cCoAP Client\u8981\u53d6\u5f97\u4f4d\u4e8eNAT\u540e\u65b9\u7684\u611f\u6d4b\u8282\u70b9\u8d44\u6599\uff0c\u5219\u987b\u8981\u5728\u8def\u7531\u5668\u4e0a\uff0c\u8bbe\u4e0a\u8bbe\u5b9avirtual server\uff0c\u6216port forwarding\u4e4b\u7c7b\u624d\u80fd\u4f7f\u7528\uff0c\u4e0d\u7136\u5c31\u5fc5\u987b\u53e6\u5916\u6709\u7b2c\u4e09\u65b9\u4f3a\u670d\u5668\u5b58\u5728\uff0c\u8ba9\u611f\u6d4b\u8282\u70b9\u5148\u8fde\u51fa\u624d\u884c\u3002<\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cCoAP\u7684\u7f51\u7edc\u5c42\u53ea\u6709IPv6\uff0c\u6240\u4ee5\u5982\u679c\u6ca1\u6709\u7269\u8054\u7f51\u7f51\u5173Gateway\uff0c\u4e00\u4e2aIPv4\u7684\u4e91\u7aef\u662f\u65e0\u6cd5\u76f4\u63a5\u8bbf\u95eeCoAP\u7ec8\u7aef\u7684\uff0c\u53ea\u80fd\u7531\u7ec8\u7aef\u53d1\u8d77\u53bb\u8bbf\u95ee\u56fa\u5b9a\u7684\u4e91\u7aef\u670d\u52a1\u5668\u3002\u5728\u5927\u91cf\u7684\u7269\u8054\u7f51\u7ec8\u7aef\u60c5\u51b5\u4e0b\uff0c\u4fdd\u6301\u8fde\u63a5\u6216\u8005\u4f1a\u8bdd\u662f\u4e0d\u73b0\u5b9e\u7684\u3002\u56e0\u6b64\u7269\u8054\u7f51Gateway\u5c31\u975e\u5e38\u91cd\u8981\u4e86\uff0c\u9700\u8981\u670d\u52a1\u5668\u901a\u8fc7Gateway\u96c6\u6210\u4e13\u6709\u7684\u5bfb\u5740\u5e94\u7528\uff0c\u53cd\u5411\u5efa\u7acb\u4e0e\u5728NAT\u540e\u7684\u7ec8\u7aef\u8fde\u63a5\u3002<\/p>\n<p>\u5bf9\u6bd4<\/p>\n<h1>\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\u5b83\u4eec\uff1f<\/h1>\n<p>\u53ef\u80fd\u90fd\u5728\u95ee\u7684\u95ee\u9898\u662f\uff0c\u300c\u5982\u679c\u4ed6\u4eec\u5f88\u76f8\u4f3c\uff0c\u6211\u5e94\u8be5\u5728\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\u54ea\u4e00\u4e2a\uff1b\u53c8\u5728\u4ec0\u4e48\u65f6\u5019\uff0c\u4f7f\u7528\u54ea\u4e00\u4e2a\uff1f\u300d<\/p>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_8530a5f9d0e9031ee88299c8e514d377.jpg\"><img decoding=\"async\" src=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_8530a5f9d0e9031ee88299c8e514d377.jpg\" alt=\"\" \/><\/a><\/p>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_24763b947c7a338b30b1fe3744d1ca36.jpg\"><img decoding=\"async\" src=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_24763b947c7a338b30b1fe3744d1ca36.jpg\" alt=\"\" \/><\/a><\/p>\n<p>\u7531\u4e8e\u53d1\u5e03\/\u8ba2\u9605\u4f53\u7cfb\u7ed3\u6784\u4e0e\u4e2d\u95f4\u5546\u4e2d\u4ecb\uff0cMQTT\u662f\u5e7f\u57df\u7f51\uff08WAN\uff0c\u4e92\u8054\u7f51\uff09\u4e0a\u7684\u8bbe\u5907\u4e4b\u95f4\u7684\u901a\u4fe1\u7684\u7406\u60f3\u9009\u62e9\u3002\u5b83\u5728\u5e26\u5bbd\u6709\u9650\u7684\u60c5\u51b5\u4e0b\u662f\u6700\u6709\u7528\u7684\uff0c\u4f8b\u5982\u8fdc\u7a0b\u73b0\u573a\u7ad9\u70b9\u6216\u5176\u4ed6\u7f3a\u4e4f\u5f3a\u5927\u7f51\u7edc\u7684\u533a\u57df\u3002<\/p>\n<p>MQTT\u662fAzure\u548cAmazon\u670d\u52a1\u4ea7\u54c1\u7684\u4e00\u90e8\u5206\uff0c\u56e0\u6b64\u5b83\u5177\u6709\u5f88\u591a\u5df2\u5efa\u7acb\u7684\u67b6\u6784\uff0c\u4f7f\u5176\u6613\u4e8e\u9002\u5e94\u5f53\u524d\u7684\u5f00\u53d1\u4eba\u5458\u3002<\/p>\n<p>CoAP\u7684\u5f3a\u9879\u662f\u4e0eHTTP\u7684\u517c\u5bb9\u6027\u3002\u5982\u679c\u60a8\u6709\u4e00\u4e2a\u57fa\u4e8eWeb\u670d\u52a1\u7684\u73b0\u6709\u7cfb\u7edf\uff0c\u90a3\u4e48\u5728CoAP\u4e2d\u6dfb\u52a0\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u9009\u62e9\u3002\u5b83\u5efa\u7acb\u5728\u7528\u6237\u6570\u636e\u62a5\u534f\u8bae\uff08UDP\uff09\u4e0a\uff0c\u8fd9\u5728\u4e00\u4e9b\u8d44\u6e90\u6709\u9650\u7684\u73af\u5883\u4e2d\u662f\u6709\u7528\u7684\u3002\u7531\u4e8eUDP\u5141\u8bb8\u5e7f\u64ad\u548c\u591a\u64ad\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u8f83\u5c11\u7684\u5e26\u5bbd\u6f5c\u5728\u5730\u4f20\u8f93\u5230\u591a\u4e2a\u4e3b\u673a\u3002\u8fd9\u4f7f\u5f97\u5b83\u5bf9\u4e8e\u8bbe\u5907\u9700\u8981\u5feb\u901f\u4ea4\u6d41\u7684\u672c\u5730\u7f51\u7edc\u73af\u5883\u5f88\u597d\uff0c\u8fd9\u5bf9\u4e8e\u4e00\u4e9bM2M\u8bbe\u7f6e\u662f\u4f20\u7edf\u7684\u3002<\/p>\n<p>\u5982\u679c\u7269\u8054\u7f51\u5f00\u53d1\u4eba\u5458\u6b63\u5728\u4f7f\u7528\u5c06\u5229\u7528\u73b0\u6709Web\u670d\u52a1\u5668\u67b6\u6784\u7684\u8bbe\u5907\uff0c\u5f00\u53d1\u4eba\u5458\u5c06\u4f7f\u7528CoAP\u3002\u4f46\u662f\uff0c\u5982\u679c\u5f00\u53d1\u8005\u6b63\u5728\u6784\u5efa\u4e00\u4e2a\u8bbe\u5907\u771f\u6b63\u201c\u4ec5\u62a5\u544a\u201d\u7684\u4e1c\u897f &#8211; \u4e5f\u5c31\u662f\u8bf4\uff0c\u5b83\u88ab\u4e22\u5f03\u5728\u7f51\u7edc\u4e0a\uff0c\u53ea\u9700\u8981\u5c06\u6570\u636e\u62a5\u544a\u56de\u670d\u52a1\u5668 &#8211; CoAP\u5c06\u4f1a\u66f4\u597d\u3002\u5176\u4ed6\u7528\u9014\uff0c\u5982\u4e91\u67b6\u6784\uff0c\u53ef\u80fd\u6700\u597d\u7528MQTT\u5b8c\u6210\u3002<\/p>\n<h1>MQTT\u548cCoAP\u7684\u672a\u6765<\/h1>\n<p>\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\uff0c\u5bf9\u4e8e\u5176\u4ed6\u534f\u8bae\uff0c\u4f7f\u7528\u6216\u884c\u4e1a\u91c7\u7528\u8d8b\u5411\u4e8e\u5411\u66f4\u81ea\u7531\u548c\u5305\u5bb9\u7684\u5e73\u53f0\u8fc1\u79fb\uff0c\u9664\u975e\u975e\u5305\u5bb9\u6027\u5e73\u53f0\u66f4\u597d\u3002 MQTT\u548cCoAP\u90fd\u662f\u5f00\u653e\u6807\u51c6\uff0c\u4efb\u4f55\u4eba\u90fd\u53ef\u4ee5\u5b9e\u73b0\u3002 CoAP\u7531\u6807\u51c6\u673a\u6784\u542f\u52a8\uff0c\u800c\u4e0d\u662f\u7531\u79c1\u6709\u516c\u53f8\uff08\u5305\u62ecIBM\uff09\u8bbe\u8ba1\u7684MQTT\u3002 CoAP\u88ab\u8bbe\u8ba1\u4e3a\u5904\u7406\u8d44\u6e90\u6709\u9650\u7684\u73af\u5883\uff0c\u53ef\u80fd\u662f\u5b83\u6210\u4e3a\u8d62\u5bb6\uff0c\u4f46\u662f\u76ee\u524dMQTT\u4f3c\u4e4e\u5904\u4e8e\u9886\u5148\u5730\u4f4d\u3002 MQTT\u80cc\u540e\u6709\u663e\u7740\u7684\u52a8\u529b &#8211; \u5927\u4e91\u73a9\u5bb6\u5df2\u7ecf\u9009\u62e9\u4e86\u8fd9\u4e00\u52bf\u5934\uff0c\u6216\u8005\u81f3\u5c11\u9009\u62e9\u5b83\u3002\u6b64\u5916\uff0c\u8bb8\u591a\u5546\u4e1a\u7528\u4f8b\u9700\u8981MQTT\uff08\u5b58\u50a8\u548c\u8f6c\u53d1\uff0c\u96c6\u4e2d\u5f0f\u4e3b\u673a\uff09\u7684\u529f\u80fd\u3002\u7136\u800c\uff0c\u4e00\u79cd\u53ef\u80fd\u6027\u662f\uff0c\u4e00\u4e9b\u56f4\u7ed5HTTP\uff08\u4f8b\u5982\u79fb\u52a8\u5e94\u7528\u7a0b\u5e8f\u5f00\u53d1\uff09\u8fdb\u884c\u6807\u51c6\u5316\u7684\u8f6f\u4ef6\u5f00\u53d1\u53ef\u4ee5\u5f00\u59cb\u5229\u7528CoAP\u6765\u5904\u7406\u5916\u56f4\u8bbe\u5907\uff0c\u5e76\u4e0e\u540e\u7aef\u901a\u4fe1\uff0c\u4ee5\u5e2e\u52a9\u51cf\u5c11\u4e0d\u826f\u8fde\u63a5\u5e26\u5bbd\u3002<\/p>\n<p>\u6700\u7ec8\uff0c\u8fd9\u4e9b\u534f\u8bae\u53ef\u4ee5\u901a\u8fc7\u4e92\u8054\u7f51\u6709\u6548\u90e8\u7f72\u5728\u4e0d\u540c\u7684\u5e94\u7528\u7a0b\u5e8f\u4e2d\u3002\u6211\u4eec\u77e5\u9053\u6709\u7279\u5b9a\u7684\u4f7f\u7528\u6848\u4f8b\uff0c\u5176\u4e2d\u6bcf\u4e2a\u90fd\u662f\u6700\u597d\u7684\uff0c\u4f46\u662f\u6211\u4eec\u4e5f\u77e5\u9053\uff0c\u7269\u8054\u7f51\u548c\u7269\u8054\u7f51\u8bbe\u5907\u5c06\u4f1a\u5728\u590d\u6742\u6027\u548c\u666e\u53ca\u6027\u65b9\u9762\u7ee7\u7eed\u53d1\u5c55\u3002\u5bf9\u4e8e\u5f00\u53d1\u4eba\u5458\u6765\u8bf4\uff0c\u4e86\u89e3\u5e94\u7528\u7a0b\u5e8f\u7684\u5173\u952e\u5dee\u5f02\u4e0d\u4ec5\u53ef\u4ee5\u5b9e\u73b0\u66f4\u597d\u7684\u521d\u59cb\u90e8\u7f72\uff0c\u800c\u4e14\u53ef\u4ee5\u4e3a\u4eca\u540e\u7684\u5f00\u53d1\u5de5\u4f5c\u5960\u5b9a\u575a\u5b9e\u7684\u57fa\u7840\u3002<\/p>\n<blockquote><p>\n  \u53c2\u8003\uff1a<br \/>\n  1. https:\/\/itknowledgeexchange.techtarget.com\/iot-agenda\/iot-developers-confused-mqtt-coap\/<br \/>\n  2. https:\/\/blog.csdn.net\/iotisan\/article\/category\/7184968<br \/>\n  3. TCP\/IP\u534f\u8bae\u6a21\u578b\uff1a <a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_848e90863cae1348dab887ffa46ac62e.jpg\"><img decoding=\"async\" src=\"https:\/\/www.db2go.net\/wp-content\/uploads\/2020\/11\/wp_editor_md_848e90863cae1348dab887ffa46ac62e.jpg\" alt=\"\" \/><\/a>\n<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>\u57fa\u7840\u901a\u4fe1\u534f\u8bae \u57fa\u7840\u901a\u4fe1\u534f\u8bae\u65b9\u9762\u6709\u4e24\u4e2a\u4e13\u95e8\u7684\u7ade\u4e89\u534f\u8bae\uff1a\u6d88\u606f\u961f\u5217\u9065\u6d4b\u4f20\u8f93( MQTT )\uff0c\u548c\u53d7\u7ea6\u675f\u7684\u5e94\u7528\u534f\u8bae(Co&hellip;<\/p>\n <a href=\"https:\/\/www.db2go.net\/?p=94\" title=\"MQTT Vs CoAP\" class=\"entry-more-link\"><span>Read More<\/span> <span class=\"screen-reader-text\">MQTT Vs CoAP<\/span><\/a>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"Layout":"","footnotes":""},"categories":[11],"tags":[],"class_list":["entry","author-suredandan","post-94","post","type-post","status-publish","format-standard","category-11"],"views":3194,"_links":{"self":[{"href":"https:\/\/www.db2go.net\/index.php?rest_route=\/wp\/v2\/posts\/94","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.db2go.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.db2go.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.db2go.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.db2go.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=94"}],"version-history":[{"count":3,"href":"https:\/\/www.db2go.net\/index.php?rest_route=\/wp\/v2\/posts\/94\/revisions"}],"predecessor-version":[{"id":97,"href":"https:\/\/www.db2go.net\/index.php?rest_route=\/wp\/v2\/posts\/94\/revisions\/97"}],"wp:attachment":[{"href":"https:\/\/www.db2go.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=94"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.db2go.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=94"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.db2go.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=94"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}