{"id":50855,"date":"2025-08-10T13:04:13","date_gmt":"2025-08-10T05:04:13","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/50855.html"},"modified":"2025-08-10T13:04:13","modified_gmt":"2025-08-10T05:04:13","slug":"mqtt%e5%8d%8f%e8%ae%ae%ef%bc%88%e5%9b%9b%ef%bc%89%e6%b7%b1%e5%85%a5%e5%89%96%e6%9e%90mqtt-qos%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/50855.html","title":{"rendered":"MQTT\u534f\u8bae\uff08\u56db\uff09\u6df1\u5165\u5256\u6790MQTT QoS\u5b9e\u6218"},"content":{"rendered":"<p>\u7269\u8054\u7f51\u7684\u7f51\u7edc\u73af\u5883\u5f80\u5f80\u662f\u201c\u4e0d\u53ef\u9760\u201d\u7684\u4ee3\u540d\u8bcd\u2014\u2014\u79fb\u52a8\u8bbe\u5907\u7684\u4fe1\u53f7\u6ce2\u52a8\u3001\u5de5\u4e1a\u73b0\u573a\u7684\u7535\u78c1\u5e72\u6270\u3001\u4f4e\u529f\u8017\u8bbe\u5907\u7684\u95f4\u6b47\u6027\u4f11\u7720\uff0c\u8fd9\u4e9b\u90fd\u53ef\u80fd\u5bfc\u81f4\u6d88\u606f\u4e22\u5931\u6216\u5ef6\u8fdf\u3002 MQTT\u534f\u8bae\u4e4b\u6240\u4ee5\u80fd\u6210\u4e3a\u7269\u8054\u7f51\u901a\u4fe1\u7684\u4e3b\u6d41\u9009\u62e9\uff0c\u6838\u5fc3\u5728\u4e8e\u5176\u670d\u52a1\u8d28\u91cf\u7b49\u7ea7\uff08QoS\uff09\u673a\u5236\uff1a\u901a\u8fc7\u4e09\u7ea7\u53ef\u9760\u6027\u7b56\u7565\uff0c\u8ba9\u5f00\u53d1\u8005\u80fd\u6839\u636e\u4e1a\u52a1\u9700\u6c42\u5728\u201c\u6548\u7387\u201d\u4e0e\u201c\u53ef\u9760\u6027\u201d\u4e4b\u95f4\u7cbe\u51c6\u6743\u8861\u3002<\/p>\n<p>\u672c\u6587\u5c06\u4ece\u5e95\u5c42\u673a\u5236\u51fa\u53d1\uff0c\u8be6\u89e3QoS 0\/1\/2\u7684\u5b9e\u73b0\u903b\u8f91\u3001\u5b9e\u6218\u4e2d\u7684\u5178\u578b\u9677\u9631\u4e0e\u89e3\u51b3\u65b9\u6848\uff0c\u5e76\u7ed3\u5408\u771f\u5b9e\u6848\u4f8b\u63d0\u70bc\u51fa\u201c\u9009\u5bf9QoS\u201d\u7684\u5b9e\u6218\u6307\u5357\u2014\u2014\u8ba9\u6bcf\u4e00\u6b21\u6d88\u606f\u4f20\u8f93\u90fd\u201c\u6070\u5230\u597d\u5904\u201d\u3002<\/p>\n<p>MQTT\u534f\u8bae\u7684\u6838\u5fc3\u4ef7\u503c\u5728\u4e8e\u9002\u5e94\u4e0d\u7a33\u5b9a\u7f51\u7edc\u73af\u5883\u7684\u80fd\u529b\uff0c\u800c\u670d\u52a1\u8d28\u91cf\u7b49\u7ea7\uff08QoS\uff09\u673a\u5236\u6b63\u662f\u5b9e\u73b0\u8fd9\u4e00\u80fd\u529b\u7684\u57fa\u77f3\u3002<\/p>\n<p>\u5728\u73b0\u4ee3\u7269\u8054\u7f51\u7cfb\u7edf\u4e2d\uff0c\u6d88\u606f\u4f20\u8f93\u7684\u53ef\u9760\u6027\u76f4\u63a5\u51b3\u5b9a\u4e86\u7cfb\u7edf\u5065\u58ee\u6027\u3002\u4f8b\u5982\uff1a\u667a\u80fd\u5de5\u5382\u7684\u505c\u673a\u6307\u4ee4\u4e22\u5931\u53ef\u80fd\u5bfc\u81f4\u751f\u4ea7\u4e8b\u6545\uff0c\u667a\u80fd\u5bb6\u5c45\u7684\u5f00\u5173\u6307\u4ee4\u91cd\u590d\u53ef\u80fd\u5f15\u53d1\u7535\u8def\u6545\u969c\uff0c\u91d1\u878d\u7ec8\u7aef\u7684\u4ea4\u6613\u6d88\u606f\u91cd\u590d\u53ef\u80fd\u9020\u6210\u8d44\u91d1\u635f\u5931\u3002MQTT\u534f\u8bae\u901a\u8fc7\u7cbe\u5fc3\u8bbe\u8ba1\u7684QoS\u673a\u5236\uff0c\u4e3a\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u4e0d\u540c\u7ea7\u522b\u7684\u6d88\u606f\u4fdd\u8bc1\u7b56\u7565\u3002\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8QoS 0\/1\/2\u7684\u5b9e\u73b0\u673a\u5236\u3001\u6d88\u606f\u91cd\u4f20\u7b56\u7565\u3001\u5ba2\u6237\u7aef\u961f\u5217\u7ba1\u7406\uff0c\u5e76\u7ed3\u5408\u771f\u5b9e\u6848\u4f8b\u63ed\u793a\u5176\u4e2d\u7684\u201c\u5751\u201d\u3002<\/p>\n<h3>\u4e00\u3001MQTT QoS\u673a\u5236\u89e3\u8bfb<\/h3>\n<p>QoS\u7684\u672c\u8d28\u662f\u201c\u6d88\u606f\u4f20\u8f93\u7684\u53ef\u9760\u6027\u627f\u8bfa\u201d\uff0c\u4f46\u8fd9\u79cd\u627f\u8bfa\u5e76\u975e\u514d\u8d39\u2014\u2014\u66f4\u9ad8\u7684\u53ef\u9760\u6027\u5f80\u5f80\u610f\u5473\u7740\u66f4\u591a\u7684\u7f51\u7edc\u5f00\u9500\u3001\u66f4\u957f\u7684\u5ef6\u8fdf\u548c\u66f4\u590d\u6742\u7684\u72b6\u6001\u7ba1\u7406\u3002\u7406\u89e3\u4e09\u7ea7QoS\u7684\u6838\u5fc3\u5dee\u5f02\uff0c\u662f\u9009\u62e9\u7684\u524d\u63d0\u3002<\/p>\n<h4>1. \u4e09\u5927QoS\u7b49\u7ea7\u7684\u672c\u8d28\u5dee\u5f02<\/h4>\n<ul>\n<li>\n<p>QoS 0\uff08\u6700\u591a\u4e00\u6b21\uff09\uff1a\u8f7b\u91cf\u7ea7\u7684\u201c\u53d1\u540e\u5373\u5fd8\u201d\u6a21\u5f0f \u53d1\u5e03\u8005\u53d1\u9001PUBLISH\u62a5\u6587\u540e\uff0c\u4e0d\u5b58\u50a8\u6d88\u606f\u3001\u4e0d\u7b49\u5f85\u786e\u8ba4\u3001\u4e0d\u91cd\u4f20\u2014\u2014\u6d88\u606f\u53ef\u80fd\u5230\u8fbe\u4e00\u6b21\uff0c\u4e5f\u53ef\u80fd\u5b8c\u5168\u4e22\u5931\u3002\u8fd9\u79cd\u6a21\u5f0f\u65e0\u989d\u5916\u7f51\u7edc\u5f00\u9500\uff0c\u9002\u5408\u5bf9\u53ef\u9760\u6027\u8981\u6c42\u4f4e\u4f46\u5bf9\u5b9e\u65f6\u6027\u3001\u5e26\u5bbd\u654f\u611f\u7684\u573a\u666f\uff08\u5982\u5468\u671f\u6027\u4f20\u611f\u5668\u8bfb\u6570\uff09\u3002<\/p>\n<\/li>\n<li>\n<p>QoS 1\uff08\u81f3\u5c11\u4e00\u6b21\uff09\uff1a\u901a\u8fc7\u7b80\u5355\u7684ACK\u786e\u8ba4\u673a\u5236\u5b9e\u73b0\u201c\u5fc5\u8fbe\u201d \u53d1\u5e03\u8005\u53d1\u9001PUBLISH\u540e\u4f1a\u5b58\u50a8\u6d88\u606f\uff0c\u7b49\u5f85\u63a5\u6536\u65b9\u8fd4\u56dePUBACK\u786e\u8ba4\uff1b\u82e5\u8d85\u65f6\u672a\u6536\u5230\u786e\u8ba4\uff0c\u5219\u91cd\u4f20\u6d88\u606f\uff08\u76f4\u81f3\u6536\u5230\u786e\u8ba4\u6216\u8fbe\u5230\u91cd\u8bd5\u4e0a\u9650\uff09\u3002\u8fd9\u79cd\u6a21\u5f0f\u4fdd\u8bc1\u6d88\u606f\u81f3\u5c11\u5230\u8fbe\u4e00\u6b21\uff0c\u4f46\u53ef\u80fd\u56e0\u91cd\u4f20\u5bfc\u81f4\u91cd\u590d\uff08\u5982PUBACK\u4e22\u5931\u65f6\uff0c\u53d1\u5e03\u8005\u4f1a\u91cd\u53d1\uff0c\u63a5\u6536\u65b9\u53ef\u80fd\u6536\u5230\u4e24\u6b21\uff09\uff0c\u9002\u5408\u9700\u8981\u201c\u6d88\u606f\u5fc5\u8fbe\u201d\u4f46\u53ef\u5bb9\u5fcd\u91cd\u590d\u7684\u573a\u666f\uff08\u5982\u5173\u952e\u72b6\u6001\u66f4\u65b0\uff09\u3002<\/p>\n<\/li>\n<li>\n<p>QoS 2\uff08\u6070\u597d\u4e00\u6b21\uff09\uff1a\u56db\u6b65\u63e1\u624b\u534f\u8bae\u786e\u4fdd\u201c\u4e25\u683c\u4e00\u6b21\u4ea4\u4ed8\u201d \u901a\u8fc7\u201cPUBLISH\u2192PUBREC\u2192PUBREL\u2192PUBCOMP\u201d\u56db\u6b65\u4ea4\u4e92\uff0c\u5728\u53d1\u5e03\u8005\u548c\u63a5\u6536\u65b9\u4e4b\u95f4\u5efa\u7acb\u53cc\u5411\u786e\u8ba4\u673a\u5236\uff0c\u786e\u4fdd\u6d88\u606f\u65e2\u4e0d\u4e22\u5931\u4e5f\u4e0d\u91cd\u590d\u3002\u8fd9\u79cd\u6a21\u5f0f\u53ef\u9760\u6027\u6700\u9ad8\uff0c\u4f46\u9700\u53cc\u65b9\u5b58\u50a8\u6d88\u606f\u72b6\u6001\u3001\u589e\u52a0\u4e24\u6b21\u7f51\u7edc\u5f80\u8fd4\uff08RTT\uff09\uff0c\u9002\u5408\u7edd\u5bf9\u4e0d\u5141\u8bb8\u91cd\u590d\u6216\u4e22\u5931\u7684\u573a\u666f\uff08\u5982\u91d1\u878d\u4ea4\u6613\u6307\u4ee4\uff09\u3002<\/p>\n<\/li>\n<\/ul>\n<h4>2. QoS\u9009\u62e9\u7684\u9ec4\u91d1\u6cd5\u5219<\/h4>\n<p>\u9009\u62e9QoS\u65f6\uff0c\u9700\u7efc\u5408\u8bc4\u4f30\u7f51\u7edc\u7a33\u5b9a\u6027\u3001\u6570\u636e\u91cd\u8981\u6027\u548c\u8bbe\u5907\u8d44\u6e90\u4e09\u5927\u56e0\u7d20\uff0c\u4e09\u8005\u7684\u6743\u91cd\u51b3\u5b9a\u4e86\u6700\u4f18\u89e3\uff1a<\/p>\n<p>  #mermaid-svg-YN6PI1ecy7Vr1ZQy {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .error-icon{fill:#552222;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .marker{fill:#333333;stroke:#333333;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .marker.cross{stroke:#333333;}#mermaid-svg-YN6PI1ecy7Vr1ZQy svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .cluster-label text{fill:#333;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .cluster-label span{color:#333;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .label text,#mermaid-svg-YN6PI1ecy7Vr1ZQy span{fill:#333;color:#333;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .node rect,#mermaid-svg-YN6PI1ecy7Vr1ZQy .node circle,#mermaid-svg-YN6PI1ecy7Vr1ZQy .node ellipse,#mermaid-svg-YN6PI1ecy7Vr1ZQy .node polygon,#mermaid-svg-YN6PI1ecy7Vr1ZQy .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .node .label{text-align:center;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .node.clickable{cursor:pointer;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .arrowheadPath{fill:#333333;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .cluster text{fill:#333;}#mermaid-svg-YN6PI1ecy7Vr1ZQy .cluster span{color:#333;}#mermaid-svg-YN6PI1ecy7Vr1ZQy div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-YN6PI1ecy7Vr1ZQy :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;} <\/p>\n<p>         <span id=\"L-L-A-B\" class=\"edgeLabel L-LS-A\\' L-LE-B\">\u9ad8<\/span> <\/p>\n<p>         <span id=\"L-L-A-C\" class=\"edgeLabel L-LS-A\\' L-LE-C\">\u4e2d<\/span> <\/p>\n<p>         <span id=\"L-L-A-D\" class=\"edgeLabel L-LS-A\\' L-LE-D\">\u4f4e<\/span> <\/p>\n<p>         <span id=\"L-L-E-B\" class=\"edgeLabel L-LS-E\\' L-LE-B\">\u4f4e<\/span> <\/p>\n<p>         <span id=\"L-L-E-C\" class=\"edgeLabel L-LS-E\\' L-LE-C\">\u4e2d<\/span> <\/p>\n<p>         <span id=\"L-L-E-D\" class=\"edgeLabel L-LS-E\\' L-LE-D\">\u9ad8<\/span> <\/p>\n<p>         <span id=\"L-L-F-D\" class=\"edgeLabel L-LS-F\\' L-LE-D\">\u4e30\u5bcc<\/span> <\/p>\n<p>         <span id=\"L-L-F-C\" class=\"edgeLabel L-LS-F\\' L-LE-C\">\u53d7\u9650<\/span> <\/p>\n<p>           \u7f51\u7edc\u7a33\u5b9a\u6027 <\/p>\n<p>           QoS 0 <\/p>\n<p>           QoS 1 <\/p>\n<p>           QoS 2 <\/p>\n<p>           \u6570\u636e\u91cd\u8981\u6027 <\/p>\n<p>           \u8bbe\u5907\u8d44\u6e90 <\/p>\n<ul>\n<li>\u4f8b1\uff1a\u5b9e\u9a8c\u5ba4\u6e29\u6e7f\u5ea6\u4f20\u611f\u5668\uff08\u7f51\u7edc\u7a33\u5b9a\u3001\u6570\u636e\u91cd\u8981\u6027\u4f4e\u3001\u8bbe\u5907\u8d44\u6e90\u53d7\u9650\uff09\u2192 QoS 0<\/li>\n<li>\u4f8b2\uff1a\u667a\u80fd\u95e8\u9501\u7684\u5f00\u9501\u6307\u4ee4\uff08\u7f51\u7edc\u4e2d\u7b49\u7a33\u5b9a\u3001\u6570\u636e\u91cd\u8981\u6027\u4e2d\u3001\u8bbe\u5907\u8d44\u6e90\u4e00\u822c\uff09\u2192 QoS 1<\/li>\n<li>\u4f8b3\uff1a\u94f6\u884cATM\u7684\u8f6c\u8d26\u6307\u4ee4\uff08\u7f51\u7edc\u7a33\u5b9a\u6027\u4f4e<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb597\u6b21\uff0c\u70b9\u8d5e19\u6b21\uff0c\u6536\u85cf9\u6b21\u3002\u6458\u8981\uff1a MQTT\u534f\u8bae\u7684QoS\u673a\u5236\u662f\u4fdd\u969c\u7269\u8054\u7f51\u901a\u4fe1\u53ef\u9760\u6027\u7684\u6838\u5fc3\uff0c\u901a\u8fc7\u4e09\u7ea7\u7b56\u7565\uff08QoS 0\/1\/2\uff09\u5e73\u8861\u6548\u7387\u4e0e\u53ef\u9760\u6027\u3002QoS 0\u201c\u6700\u591a\u4e00\u6b21\u201d\u8f7b\u91cf\u4f46\u53ef\u80fd\u4e22\u5931\u6570\u636e\uff0c\u9002\u5408\u5b9e\u65f6\u975e\u5173\u952e\u573a\u666f\uff08\u5982\u4f20\u611f\u5668\u8bfb\u6570\uff09\uff1bQoS 1\u201c\u81f3\u5c11\u4e00\u6b21\u201d\u901a\u8fc7\u786e\u8ba4\u91cd\u4f20\u786e\u4fdd\u5fc5\u8fbe\uff0c\u4f46\u53ef\u80fd\u91cd\u590d\uff08\u5982\u667a\u80fd\u95e8\u9501\u6307\u4ee4\uff09\uff1bQoS 2\u201c\u6070\u597d\u4e00\u6b21\u201d\u901a\u8fc7\u56db\u6b65\u63e1\u624b\u5b9e\u73b0\u4e25\u683c\u4e0d\u91cd\u590d\u4e0d\u4e22\u5931\uff08\u5982\u91d1\u878d\u4ea4\u6613\uff09\u3002\u9009\u62e9\u65f6\u9700\u6743\u8861\u7f51\u7edc\u7a33\u5b9a\u6027\u3001\u6570\u636e\u91cd\u8981\u6027\u548c\u8bbe\u5907\u8d44\u6e90\uff0c\u4f8b\u5982\uff1aQoS 0\u9002\u7528\u4e8e\u5e26\u5bbd\u654f\u611f\u573a\u666f\uff0cQoS 1\u9002\u5408\u5bb9\u5fcd\u91cd\u590d\u7684\u5173\u952e\u64cd\u4f5c\uff0cQoS 2\u7528\u4e8e\u9ad8\u53ef\u9760\u6027\u9700\u6c42\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4966,320,4967],"topic":[],"class_list":["post-50855","post","type-post","status-publish","format-standard","hentry","category-server","tag-iot","tag-mqtt","tag-qos"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MQTT\u534f\u8bae\uff08\u56db\uff09\u6df1\u5165\u5256\u6790MQTT QoS\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/50855.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MQTT\u534f\u8bae\uff08\u56db\uff09\u6df1\u5165\u5256\u6790MQTT QoS\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb597\u6b21\uff0c\u70b9\u8d5e19\u6b21\uff0c\u6536\u85cf9\u6b21\u3002\u6458\u8981\uff1a MQTT\u534f\u8bae\u7684QoS\u673a\u5236\u662f\u4fdd\u969c\u7269\u8054\u7f51\u901a\u4fe1\u53ef\u9760\u6027\u7684\u6838\u5fc3\uff0c\u901a\u8fc7\u4e09\u7ea7\u7b56\u7565\uff08QoS 0\/1\/2\uff09\u5e73\u8861\u6548\u7387\u4e0e\u53ef\u9760\u6027\u3002QoS 0\u201c\u6700\u591a\u4e00\u6b21\u201d\u8f7b\u91cf\u4f46\u53ef\u80fd\u4e22\u5931\u6570\u636e\uff0c\u9002\u5408\u5b9e\u65f6\u975e\u5173\u952e\u573a\u666f\uff08\u5982\u4f20\u611f\u5668\u8bfb\u6570\uff09\uff1bQoS 1\u201c\u81f3\u5c11\u4e00\u6b21\u201d\u901a\u8fc7\u786e\u8ba4\u91cd\u4f20\u786e\u4fdd\u5fc5\u8fbe\uff0c\u4f46\u53ef\u80fd\u91cd\u590d\uff08\u5982\u667a\u80fd\u95e8\u9501\u6307\u4ee4\uff09\uff1bQoS 2\u201c\u6070\u597d\u4e00\u6b21\u201d\u901a\u8fc7\u56db\u6b65\u63e1\u624b\u5b9e\u73b0\u4e25\u683c\u4e0d\u91cd\u590d\u4e0d\u4e22\u5931\uff08\u5982\u91d1\u878d\u4ea4\u6613\uff09\u3002\u9009\u62e9\u65f6\u9700\u6743\u8861\u7f51\u7edc\u7a33\u5b9a\u6027\u3001\u6570\u636e\u91cd\u8981\u6027\u548c\u8bbe\u5907\u8d44\u6e90\uff0c\u4f8b\u5982\uff1aQoS 0\u9002\u7528\u4e8e\u5e26\u5bbd\u654f\u611f\u573a\u666f\uff0cQoS 1\u9002\u5408\u5bb9\u5fcd\u91cd\u590d\u7684\u5173\u952e\u64cd\u4f5c\uff0cQoS 2\u7528\u4e8e\u9ad8\u53ef\u9760\u6027\u9700\u6c42\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/50855.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-10T05:04:13+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/50855.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/50855.html\",\"name\":\"MQTT\u534f\u8bae\uff08\u56db\uff09\u6df1\u5165\u5256\u6790MQTT QoS\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2025-08-10T05:04:13+00:00\",\"dateModified\":\"2025-08-10T05:04:13+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/50855.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/50855.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/50855.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"MQTT\u534f\u8bae\uff08\u56db\uff09\u6df1\u5165\u5256\u6790MQTT QoS\u5b9e\u6218\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"MQTT\u534f\u8bae\uff08\u56db\uff09\u6df1\u5165\u5256\u6790MQTT QoS\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/50855.html","og_locale":"zh_CN","og_type":"article","og_title":"MQTT\u534f\u8bae\uff08\u56db\uff09\u6df1\u5165\u5256\u6790MQTT QoS\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb597\u6b21\uff0c\u70b9\u8d5e19\u6b21\uff0c\u6536\u85cf9\u6b21\u3002\u6458\u8981\uff1a MQTT\u534f\u8bae\u7684QoS\u673a\u5236\u662f\u4fdd\u969c\u7269\u8054\u7f51\u901a\u4fe1\u53ef\u9760\u6027\u7684\u6838\u5fc3\uff0c\u901a\u8fc7\u4e09\u7ea7\u7b56\u7565\uff08QoS 0\/1\/2\uff09\u5e73\u8861\u6548\u7387\u4e0e\u53ef\u9760\u6027\u3002QoS 0\u201c\u6700\u591a\u4e00\u6b21\u201d\u8f7b\u91cf\u4f46\u53ef\u80fd\u4e22\u5931\u6570\u636e\uff0c\u9002\u5408\u5b9e\u65f6\u975e\u5173\u952e\u573a\u666f\uff08\u5982\u4f20\u611f\u5668\u8bfb\u6570\uff09\uff1bQoS 1\u201c\u81f3\u5c11\u4e00\u6b21\u201d\u901a\u8fc7\u786e\u8ba4\u91cd\u4f20\u786e\u4fdd\u5fc5\u8fbe\uff0c\u4f46\u53ef\u80fd\u91cd\u590d\uff08\u5982\u667a\u80fd\u95e8\u9501\u6307\u4ee4\uff09\uff1bQoS 2\u201c\u6070\u597d\u4e00\u6b21\u201d\u901a\u8fc7\u56db\u6b65\u63e1\u624b\u5b9e\u73b0\u4e25\u683c\u4e0d\u91cd\u590d\u4e0d\u4e22\u5931\uff08\u5982\u91d1\u878d\u4ea4\u6613\uff09\u3002\u9009\u62e9\u65f6\u9700\u6743\u8861\u7f51\u7edc\u7a33\u5b9a\u6027\u3001\u6570\u636e\u91cd\u8981\u6027\u548c\u8bbe\u5907\u8d44\u6e90\uff0c\u4f8b\u5982\uff1aQoS 0\u9002\u7528\u4e8e\u5e26\u5bbd\u654f\u611f\u573a\u666f\uff0cQoS 1\u9002\u5408\u5bb9\u5fcd\u91cd\u590d\u7684\u5173\u952e\u64cd\u4f5c\uff0cQoS 2\u7528\u4e8e\u9ad8\u53ef\u9760\u6027\u9700\u6c42\u3002","og_url":"https:\/\/www.wsisp.com\/helps\/50855.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2025-08-10T05:04:13+00:00","author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"2 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/50855.html","url":"https:\/\/www.wsisp.com\/helps\/50855.html","name":"MQTT\u534f\u8bae\uff08\u56db\uff09\u6df1\u5165\u5256\u6790MQTT QoS\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2025-08-10T05:04:13+00:00","dateModified":"2025-08-10T05:04:13+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/50855.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/50855.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/50855.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"MQTT\u534f\u8bae\uff08\u56db\uff09\u6df1\u5165\u5256\u6790MQTT QoS\u5b9e\u6218"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/50855","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=50855"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/50855\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=50855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=50855"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=50855"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=50855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}