{"id":1614,"date":"2019-03-14T12:54:34","date_gmt":"2019-03-14T04:54:34","guid":{"rendered":"https:\/\/www.xiaobo.li\/?p=1614"},"modified":"2019-03-14T12:54:34","modified_gmt":"2019-03-14T04:54:34","slug":"coap","status":"publish","type":"post","link":"https:\/\/www.xiaobo.li\/notes\/archives\/1614","title":{"rendered":"CoAP"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">COAP\u534f\u8bae\u7b80\u4ecb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Coap\uff08Constrained\n Application Protocol\uff09\u662f\u4e00\u79cd\u5728\u7269\u8054\u7f51\u4e16\u754c\u7684\u7c7bweb\u534f\u8bae\uff0c\u5b83\u7684\u8be6\u7ec6\u89c4\u8303\u5b9a\u4e49\u5728 RFC \n7252\u3002COAP\u540d\u5b57\u7ffb\u8bd1\u6765\u5c31\u662f\u201c\u53d7\u9650\u5e94\u7528\u534f\u8bae\u201d\uff0c\u987e\u540d\u601d\u4e49\uff0c\u4f7f\u7528\u5728\u8d44\u6e90\u53d7\u9650\u7684\u7269\u8054\u7f51\u8bbe\u5907\u4e0a\u3002\u7269\u8054\u7f51\u8bbe\u5907\u7684ram\uff0crom\u90fd\u901a\u5e38\u975e\u5e38\u5c0f\uff0c\u8fd0\u884cTCP\u548cHTTP\u662f\u4e0d\u53ef\u4ee5\u63a5\u53d7\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">COAP\u534f\u8bae\u7279\u70b9<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1 COAP\u534f\u8bae\u7f51\u7edc\u4f20\u8f93\u5c42\u7531TCP\u6539\u4e3aUDP\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"406\" height=\"215\" src=\"https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/1111.jpg\" alt=\"\" class=\"wp-image-1615\" srcset=\"https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/1111.jpg 406w, https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/1111-300x159.jpg 300w\" sizes=\"auto, (max-width: 406px) 100vw, 406px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">COAP\u534f\u8bae\u5c42<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2 \u5b83\u57fa\u4e8eREST\uff0cserver\u7684\u8d44\u6e90\u5730\u5740\u548c\u4e92\u8054\u7f51\u4e00\u6837\u4e5f\u6709\u7c7b\u4f3curl\u7684\u683c\u5f0f\uff0c\u5ba2\u6237\u7aef\u540c\u6837\u6709POST\uff0cGET,PUT,DELETE\u65b9\u6cd5\u6765\u8bbf\u95eeserver\uff0c\u5bf9HTTP\u505a\u4e86\u7b80\u5316\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3 COAP\u662f\u4e8c\u8fdb\u5236\u683c\u5f0f\u7684\uff0cHTTP\u662f\u6587\u672c\u683c\u5f0f\u7684\uff0cCOAP\u6bd4HTTP\u66f4\u52a0\u7d27\u51d1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">4 \u8f7b\u91cf\u5316\uff0cCOAP\u6700\u5c0f\u957f\u5ea6\u4ec5\u4ec54B\uff0c\u4e00\u4e2aHTTP\u7684\u5934\u90fd\u51e0\u5341\u4e2aB\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">5 \u652f\u6301\u53ef\u9760\u4f20\u8f93\uff0c\u6570\u636e\u91cd\u4f20\uff0c\u5757\u4f20\u8f93\u3002 \u786e\u4fdd\u6570\u636e\u53ef\u9760\u5230\u8fbe\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">6 \u652f\u6301IP\u591a\u64ad, \u5373\u53ef\u4ee5\u540c\u65f6\u5411\u591a\u4e2a\u8bbe\u5907\u53d1\u9001\u8bf7\u6c42\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">7 \u975e\u957f\u8fde\u63a5\u901a\u4fe1\uff0c\u9002\u7528\u4e8e\u4f4e\u529f\u8017\u7269\u8054\u7f51\u573a\u666f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">COAP\u534f\u8bae\u6d88\u606f\u7c7b\u578b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">COAP\u534f\u8bae\u67094\u79cd\u6d88\u606f\u7c7b\u578b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CON\u2014\u2014   \u9700\u8981\u88ab\u786e\u8ba4\u7684\u8bf7\u6c42\uff0c\u5982\u679cCON\u8bf7\u6c42\u88ab\u53d1\u9001\uff0c\u90a3\u4e48\u5bf9\u65b9\u5fc5\u987b\u505a\u51fa\u54cd\u5e94\u3002\u8fd9\u6709\u70b9\u50cfTCP\uff0c\u5bf9\u65b9\u5fc5\u987b\u7ed9\u786e\u8ba4\u6536\u5230\u6d88\u606f\uff0c\u7528\u4ee5\u53ef\u9760\u6d88\u606f\u4f20\u8f93\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"318\" height=\"183\" src=\"https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/2222.jpg\" alt=\"\" class=\"wp-image-1616\" srcset=\"https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/2222.jpg 318w, https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/2222-300x173.jpg 300w\" sizes=\"auto, (max-width: 318px) 100vw, 318px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u9760\u6d88\u606f\u4f20\u8f93<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">NON\u2014\u2014  \u4e0d\u9700\u8981\u88ab\u786e\u8ba4\u7684\u8bf7\u6c42\uff0c\u5982\u679cNON\u8bf7\u6c42\u88ab\u53d1\u9001\uff0c\u90a3\u4e48\u5bf9\u65b9\u4e0d\u5fc5\u505a\u51fa\u56de\u5e94\u3002\u8fd9\u9002\u7528\u4e8e\u6d88\u606f\u4f1a\u91cd\u590d\u9891\u7e41\u7684\u53d1\u9001\uff0c\u4e22\u5305\u4e0d\u5f71\u54cd\u6b63\u5e38\u64cd\u4f5c\u3002\u8fd9\u4e2a\u548cUDP\u5f88\u50cf\u3002\u7528\u4ee5\u4e0d\u53ef\u9760\u6d88\u606f\u4f20\u8f93\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"352\" height=\"142\" src=\"https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/3333.jpg\" alt=\"\" class=\"wp-image-1617\" srcset=\"https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/3333.jpg 352w, https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/3333-300x121.jpg 300w\" sizes=\"auto, (max-width: 352px) 100vw, 352px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u53ef\u9760\u6d88\u606f\u4f20\u8f93<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ACK  \u2014\u2014  \u5e94\u7b54\u6d88\u606f\uff0c\u5bf9\u5e94\u7684\u662fCON\u6d88\u606f\u7684\u5e94\u7b54\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">RST  \u2014\u2014  \u590d\u4f4d\u6d88\u606f\uff0c\u53ef\u9760\u4f20\u8f93\u65f6\u5019\u63a5\u6536\u7684\u6d88\u606f\u4e0d\u8ba4\u8bc6\u6216\u9519\u8bef\u65f6\uff0c\u4e0d\u80fd\u56deACK\u6d88\u606f\uff0c\u5fc5\u987b\u56deRST\u6d88\u606f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">COAP\u6d88\u606f\u683c\u5f0f<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"291\" src=\"https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/4444.jpg\" alt=\"\" class=\"wp-image-1618\" srcset=\"https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/4444.jpg 640w, https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/4444-300x136.jpg 300w, https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/4444-624x284.jpg 624w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">coap\u6d88\u606f\u683c\u5f0f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6d88\u606f\u5934\uff08HEAD\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b2c\u4e00\u884c\u662f\u6d88\u606f\u5934\uff0c\u5fc5\u987b\u6709\uff0c\u56fa\u5b9a4\u4e2abyte\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ver : 2bit\uff0c \u7248\u672c\u4fe1\u606f\uff0c\u5f53\u524d\u662f\u5fc5\u987b\u51990x01\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\uff1a 2bit\uff0c \u6d88\u606f\u7c7b\u578b\uff0c\u5305\u62ec CON, NON. ACK, RST\u8fd94\u79cd\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">TKL: 4bit\uff0ctoken\u957f\u5ea6\uff0c \u5f53\u524d\u652f\u63010~8B\u957f\u5ea6\uff0c\u5176\u4ed6\u957f\u5ea6\u4fdd\u7559\u5c06\u6765\u6269\u5c55\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Code\uff1a8bit\uff0c\u5206\u6210\u524d3bit\uff080~7\uff09\u548c\u540e5bit\uff080~31\uff09\uff0c\u524d3bit\u4ee3\u8868\u7c7b\u578b\u3002 0\u4ee3\u8868\u7a7a\u6d88\u606f\u6216\u8005\u8bf7\u6c42\u7801\uff0c 2\u5f00\u5934\u4ee3\u8868\u54cd\u5e94\u7801\uff0c\u53d6\u503c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1 0.00 Indicates an Empty message<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2 0.01-0.31 Indicates a request. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3 1.00-1.31 Reserved<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">4 2.00-5.31 Indicates a response. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">5 6.00-7.31 Reserved<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Message ID\uff1a16bit\uff0c \u4ee3\u8868\u6d88\u606fMID\uff0c\u6bcf\u4e2a\u6d88\u606f\u90fd\u6709\u4e00\u4e2aID \uff0c\u91cd\u53d1\u7684\u6d88\u606fMID\u4e0d\u53d8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">token\uff08\u53ef\u9009\uff09\u7528\u4e8e\u5c06\u54cd\u5e94\u4e0e\u8bf7\u6c42\u5339\u914d\u3002\n token\u503c\u4e3a0\u52308\u5b57\u8282\u7684\u5e8f\u5217\u3002 ( \u6bcf\u6761\u6d88\u606f\u5fc5\u987b\u5e26\u6709\u4e00\u4e2a\u6807\u8bb0, \u5373\u4f7f\u5b83\u7684\u957f\u5ea6\u4e3a\u96f6\uff09\u3002 \u6bcf\u4e2a\u8bf7\u6c42\u90fd\u5e26\u6709\u4e00\u4e2a\u5ba2\u6237\u7aef\u751f\u6210\u7684token, \n\u670d\u52a1\u5668\u5728\u4efb\u4f55\u7ed3\u679c\u54cd\u5e94\u4e2d\u90fd\u5fc5\u987b\u5bf9\u5176\u8fdb\u884c\u56de\u5e94\u3002token\u7c7b\u4f3c\u6d88\u606fID\uff0c\u7528\u4ee5\u6807\u8bb0\u6d88\u606f\u7684\u552f\u4e00\u6027\u3002token\u8fd8\u662f\u6d88\u606f\u5b89\u5168\u6027\u7684\u4e00\u4e2a\u8bbe\u7f6e\uff0c\u4f7f\u7528\u51688\u5b57\u8282\u7684\u968f\u673a\u6570\uff0c\u4f7f\u4f2a\u9020\u7684\u62a5\u6587\u65e0\u6cd5\u83b7\u5f97\u9a8c\u8bc1\u901a\u8fc7\u3002option\uff08\u53ef\u9009\uff0c0\u4e2a\u6216\u8005\u591a\u4e2a\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bf7\u6c42\u6d88\u606f \u4e0e\u56de\u5e94\u6d88\u606f\u90fd\u53ef\u4ee50~\u591a\u4e2aoptions\u3002 \u4e3b\u8981\u7528\u4e8e\u63cf\u8ff0\u8bf7\u6c42\u6216\u8005\u54cd\u5e94\u5bf9\u5e94\u7684\u5404\u4e2a\u5c5e\u6027\uff0c\u7c7b\u4f3c\u53c2\u6570\u6216\u8005\u7279\u5f81\u63cf\u8ff0\uff0c\u6bd4\u5982\u662f\u5426\u7528\u5230\u4ee3\u7406\u670d\u52a1\u5668\uff0c\u76ee\u7684\u4e3b\u673a\u7684\u7aef\u53e3\u7b49\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">payload\uff08\u53ef\u9009\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9e\u9645\u643a\u5e26\u6570\u636e\u5185\u5bb9\uff0c \u82e5\u6709\uff0c \u524d\u9762\u52a0payload\u6807\u8bc6\u7b26\u201c0xFF\u201d\uff0c\u5982\u679c\u6ca1\u6709payload\u6807\u8bc6\u7b26\uff0c\u90a3\u4e48\u5c31\u4ee3\u8868\u8fd9\u662f\u4e00\u4e2a0\u957f\u5ea6\u7684payload\u3002\u5982\u679c\u5b58\u5728payload\u6807\u8bc6\u7b26\u4f46\u5176\u540e\u8ddf\u968f\u7684\u662f0\u957f\u5ea6\u7684payload\uff0c\u90a3\u4e48\u5fc5\u987b\u5f53\u4f5c\u6d88\u606f\u683c\u5f0f\u9519\u8bef\u5904\u7406\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">COAP\u7684\u8bf7\u6c42\u7801\uff08requests\uff09\u548c\u54cd\u5e94\u7801(responses)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30100.01\u3011GET\u65b9\u6cd5\u2014\u2014\u7528\u4e8e\u83b7\u5f97\u67d0\u8d44\u6e90<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30100.02\u3011POST\u65b9\u6cd5\u2014\u2014\u7528\u4e8e\u521b\u5efa\u67d0\u8d44\u6e90<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30100.03\u3011PUT\u65b9\u6cd5\u2014\u2014\u7528\u4e8e\u66f4\u65b0\u67d0\u8d44\u6e90<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30100.04\u3011DELETE\u65b9\u6cd5\u2014\u2014\u7528\u4e8e\u5220\u9664\u67d0\u8d44\u6e90<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CoAP\u7684URL<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">coap\u7684url\u548cHTTP\u7684\u6709\u5f88\u76f8\u4f3c\u7684\u5730\u65b9\uff0c\u5f00\u5934\u662f\u201ccoap\u201d\u5bf9\u5e94\u201chttp\u201d\u6216\u8005\u201ccoaps\u201d\u5bf9\u5e94\u201chttps\u201d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HTTP\u7684\u9ed8\u8ba4\u7aef\u53e3\u662ftcp 80\uff0ccoap\u7684\u9ed8\u8ba4\u7aef\u53e3\u662fudp 5683\uff08coaps\u662f5684\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">URL\u91cc\u9762\u7684\u201c\/\u201d\u201c&amp;\u201d\u201c.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u4e09\u4e2aURL\u7684\u5730\u5740\u662f\u4e00\u6837\u7684\u3002\u8bbf\u95eeexample.com\u8fd9\u4e2a\u57df\u540d\uff0c\u7aef\u53e3\u662fudp 5683\uff0c\u8bbf\u95ee\u7684\u8d44\u6e90\u5730\u5740\u662f~sensors\/temp.xml\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">coap:\/\/example.com:5683\/~sensors\/temp.xml<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">coap:\/\/EXAMPLE.com\/%7Esensors\/temp.xml<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">coap:\/\/EXAMPLE.com:\/%7esensors\/temp.xml<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">COAP\u7684\u5b89\u5168\u6027<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">COAP\u7684\u5b89\u5168\u6027\u662f\u7528DTLS\u52a0\u5bc6\u5b9e\u73b0\u7684\u3002DTLS\u7684\u5b9e\u73b0\u9700\u8981\u7684\u8d44\u6e90\u548c\u5e26\u5bbd\u8f83\u591a\uff0c\u5982\u679c\u662f\u8d44\u6e90\u975e\u5e38\u5c11\u7684\u7ec8\u7aef\u548c\u6781\u6709\u9650\u7684\u5e26\u5bbd\u4e0b\u53ef\u80fd\u4f1a\u8dd1\u4e0d\u8d77\u6765\u3002DTLS\u4ec5\u4ec5\u5728\u5355\u64ad\u60c5\u51b5\u4e0b\u9002\u7528\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"283\" src=\"https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/5555.jpg\" alt=\"\" class=\"wp-image-1619\" srcset=\"https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/5555.jpg 453w, https:\/\/www.xiaobo.li\/notes\/wp-content\/uploads\/2019\/03\/5555-300x187.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>COAP\u534f\u8bae\u7b80\u4ecb Coap\uff08Constrained Application Pr &hellip; <a href=\"https:\/\/www.xiaobo.li\/notes\/archives\/1614\">\u7ee7\u7eed\u9605\u8bfb <span 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