{"id":56169,"date":"2025-08-14T13:44:43","date_gmt":"2025-08-14T05:44:43","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/56169.html"},"modified":"2025-08-14T13:44:43","modified_gmt":"2025-08-14T05:44:43","slug":"mqtt%e5%8d%8f%e8%ae%ae%ef%bc%88%e5%85%ab%ef%bc%89mqtt-5-0-%e6%96%b0%e7%89%b9%e6%80%a7%ef%bc%9a%e5%8e%9f%e5%9b%a0%e7%a0%81%e3%80%81%e5%85%b1%e4%ba%ab%e8%ae%a2%e9%98%85%e3%80%81%e6%b6%88%e6%81%af","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/56169.html","title":{"rendered":"MQTT\u534f\u8bae\uff08\u516b\uff09MQTT 5.0 \u65b0\u7279\u6027\uff1a\u539f\u56e0\u7801\u3001\u5171\u4eab\u8ba2\u9605\u3001\u6d88\u606f\u8fc7\u671f\u4e0e\u6d41\u91cf\u63a7\u5236\u7684\u5b9e\u6218\u6307\u5357"},"content":{"rendered":"<h2><\/h2>\n<p>2024\u5e74\u67d0\u8f66\u8054\u7f51\u5e73\u53f0\u56e0\u9519\u8bef\u5904\u7406\u539f\u56e0\u7801135&#xff08;\u672a\u6388\u6743&#xff09;&#xff0c;\u5bfc\u81f420\u4e07\u8f66\u8f86\u63a7\u5236\u6307\u4ee4\u6cc4\u9732\u2014\u2014\u534f\u8bae\u7ec6\u8282\u7684\u5ffd\u89c6\u53ef\u80fd\u5f15\u53d1\u707e\u96be\u6027\u540e\u679c\u3002<\/p>\n<p>\u4eceMQTT 3.1.1\u52305.0&#xff0c;\u534f\u8bae\u7684\u5347\u7ea7\u4e0d\u4ec5\u662f\u529f\u80fd\u7684\u589e\u52a0&#xff0c;\u66f4\u662f\u8bbe\u8ba1\u7406\u5ff5\u7684\u9769\u65b0\u3002MQTT 3.1.1\u5728\u5927\u89c4\u6a21\u7269\u8054\u7f51\u573a\u666f\u4e2d\u9010\u6e10\u66b4\u9732\u77ed\u677f&#xff1a;\u9519\u8bef\u5904\u7406\u6a21\u7cca&#xff08;\u4ec5\u901a\u8fc7CONNACK\u8fd4\u56de\u6709\u9650\u4ee3\u7801&#xff09;\u3001\u8d1f\u8f7d\u5747\u8861\u7f3a\u5931&#xff08;\u5355\u8ba2\u9605\u8005\u65e0\u6cd5\u5206\u6d41&#xff09;\u3001\u6d88\u606f\u751f\u547d\u5468\u671f\u5931\u63a7&#xff08;\u7f3a\u4e4f\u8fc7\u671f\u673a\u5236&#xff09;\u2026\u2026\u8fd9\u4e9b\u95ee\u9898\u5728\u8bbe\u5907\u91cf\u7a81\u7834\u767e\u4e07\u7ea7\u65f6&#xff0c;\u53ef\u80fd\u5f15\u53d1\u6570\u636e\u6cc4\u9732\u3001\u7cfb\u7edf\u96ea\u5d29\u7b49\u4e25\u91cd\u4e8b\u6545\u3002<\/p>\n<p>MQTT 5.0\u901a\u8fc7\u539f\u56e0\u7801\u4e0e\u5c5e\u6027\u5b9e\u73b0\u7cbe\u7ec6\u5316\u63a7\u5236&#xff0c;\u5171\u4eab\u8ba2\u9605\u89e3\u51b3\u8d1f\u8f7d\u5747\u8861\u96be\u9898&#xff0c;\u6d88\u606f\u8fc7\u671f\u7ba1\u7406\u65f6\u6548\u6027\u6570\u636e&#xff0c;\u6d41\u91cf\u63a7\u5236\u4fdd\u969c\u7cfb\u7edf\u7a33\u5b9a&#xff0c;\u4e3a\u590d\u6742\u7269\u8054\u7f51\u573a\u666f\u63d0\u4f9b\u4e86\u5b8c\u6574\u89e3\u51b3\u65b9\u6848\u3002\u672c\u6587\u7ed3\u540820&#043;\u5b9e\u6218\u6848\u4f8b&#xff0c;\u62c6\u89e3\u65b0\u7279\u6027\u7684\u6280\u672f\u7ec6\u8282\u3001\u5e94\u7528\u573a\u666f\u4e0e\u907f\u5751\u6307\u5357&#xff0c;\u5e2e\u52a9\u5f00\u53d1\u8005\u4ece\u201c\u80fd\u7528\u201d\u5230\u201c\u7528\u597d\u201dMQTT 5.0\u3002<\/p>\n<h3>\u4e00\u3001\u539f\u56e0\u7801&#xff08;Reason Code&#xff09;\u4e0e\u5c5e\u6027&#xff08;Properties&#xff09;&#xff1a;\u7cbe\u7ec6\u5316\u63a7\u5236\u4e0e\u8fd0\u7ef4\u7684\u57fa\u77f3<\/h3>\n<p>MQTT 3.1.1\u7684\u6700\u5927\u75db\u70b9\u662f\u201c\u64cd\u4f5c\u7ed3\u679c\u53cd\u9988\u6a21\u7cca\u201d\u2014\u2014\u4f8b\u5982\u8fde\u63a5\u5931\u8d25\u4ec5\u8fd4\u56deCONNACK code&#061;5&#xff08;\u672a\u6388\u6743&#xff09;&#xff0c;\u4f46\u65e0\u6cd5\u8bf4\u660e\u5177\u4f53\u539f\u56e0&#xff08;\u5bc6\u7801\u9519\u8bef&#xff1f;\u8bc1\u4e66\u8fc7\u671f&#xff1f;IP\u9ed1\u540d\u5355&#xff1f;&#xff09;\u3002MQTT 5.0\u901a\u8fc7\u539f\u56e0\u7801&#xff08;\u660e\u786e\u7ed3\u679c&#xff09;\u548c\u5c5e\u6027&#xff08;\u8865\u5145\u5143\u6570\u636e&#xff09;\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898&#xff0c;\u4e3a\u5f00\u53d1\u4e0e\u8fd0\u7ef4\u63d0\u4f9b\u7cbe\u51c6\u4f9d\u636e\u3002<\/p>\n<h4>1.1 \u4ece\u201c\u6a21\u7cca\u53cd\u9988\u201d\u5230\u201c\u7cbe\u51c6\u5b9a\u4f4d\u201d<\/h4>\n<p>\u539f\u56e0\u7801&#xff08;Reason Code&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u8986\u76d6\u8fde\u63a5&#xff08;CONNACK&#xff09;\u3001\u8ba2\u9605&#xff08;SUBACK&#xff09;\u3001\u53d1\u5e03&#xff08;PUBACK&#xff09;\u7b49\u6240\u6709\u64cd\u4f5c&#xff0c;\u75281\u5b57\u8282\u7f16\u7801\u7ed3\u679c&#xff1b;<\/li>\n<li>\u5206\u4e3a\u201c\u6210\u529f\u7c7b\u201d&#xff08;0x00-0x1F&#xff09;\u548c\u201c\u5931\u8d25\u7c7b\u201d&#xff08;0x80-0xFF&#xff09;&#xff0c;\u517146\u79cd\u7ec6\u5206\u72b6\u6001\u3002<\/li>\n<\/ul>\n<table>\n<tr>\u64cd\u4f5c\u7c7b\u578b\u5178\u578b\u6210\u529f\u539f\u56e0\u7801\u5178\u578b\u5931\u8d25\u539f\u56e0\u7801\u5e94\u7528\u4ef7\u503c<\/tr>\n<tbody>\n<tr>\n<td>\u8fde\u63a5<\/td>\n<td>0x00&#xff08;\u8fde\u63a5\u6210\u529f&#xff09;<\/td>\n<td>0x87&#xff08;\u672a\u6388\u6743&#xff09;\u30010x86&#xff08;\u8bc1\u4e66\u65e0\u6548&#xff09;<\/td>\n<td>\u5feb\u901f\u5b9a\u4f4d\u8fde\u63a5\u5931\u8d25\u539f\u56e0&#xff08;\u5982\u8bbe\u5907\u88ab\u540a\u9500&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u8ba2\u9605<\/td>\n<td>0x00&#xff08;\u8ba2\u9605\u6210\u529f&#xff09;<\/td>\n<td>0x82&#xff08;\u4e3b\u9898\u8fc7\u6ee4\u65e0\u6548&#xff09;\u30010x87&#xff08;\u65e0\u8ba2\u9605\u6743\u9650&#xff09;<\/td>\n<td>\u660e\u786e\u8ba2\u9605\u5931\u8d25\u662f\u8bed\u6cd5\u9519\u8bef\u8fd8\u662f\u6743\u9650\u95ee\u9898<\/td>\n<\/tr>\n<tr>\n<td>\u53d1\u5e03<\/td>\n<td>0x00&#xff08;\u53d1\u5e03\u786e\u8ba4&#xff09;<\/td>\n<td>0x90&#xff08;\u62a5\u6587\u8fc7\u5927&#xff09;\u30010x91&#xff08;\u62a5\u6587ID\u91cd\u590d&#xff09;<\/td>\n<td>\u6392\u67e5\u6d88\u606f\u53d1\u9001\u5931\u8d25\u7684\u5177\u4f53\u539f\u56e0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5c5e\u6027&#xff08;Properties&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u9644\u52a0\u5728MQTT\u62a5\u6587\u4e2d\u7684\u952e\u503c\u5bf9&#xff0c;\u7528\u4e8e\u4f20\u9012\u5143\u6570\u636e&#xff08;\u5982\u8fc7\u671f\u65f6\u95f4\u3001\u9519\u8bef\u63cf\u8ff0&#xff09;&#xff1b;<\/li>\n<li>\u652f\u6301\u6807\u51c6\u5316\u5c5e\u6027&#xff08;\u5982ReasonString\u3001MessageExpiryInterval&#xff09;\u548c\u81ea\u5b9a\u4e49\u5c5e\u6027&#xff08;User Property&#xff09;\u3002<\/li>\n<\/ul>\n<table>\n<tr>\u5e38\u7528\u5c5e\u6027\u4f5c\u7528\u9002\u7528\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>ReasonString<\/td>\n<td>\u4eba\u7c7b\u53ef\u8bfb\u7684\u9519\u8bef\u63cf\u8ff0&#xff08;\u5982\u201c\u8bbe\u5907\u5df2\u88ab\u5217\u5165\u9ed1\u540d\u5355\u201d&#xff09;<\/td>\n<td>\u5f00\u53d1\u8c03\u8bd5\u4e0e\u8fd0\u7ef4\u6392\u67e5<\/td>\n<\/tr>\n<tr>\n<td>SessionExpiryInterval<\/td>\n<td>\u4f1a\u8bdd\u8fc7\u671f\u65f6\u95f4&#xff08;\u79d2&#xff09;&#xff0c;0\u8868\u793a\u7acb\u5373\u8fc7\u671f<\/td>\n<td>\u63a7\u5236\u5ba2\u6237\u7aef\u79bb\u7ebf\u540e\u4f1a\u8bdd\u4fdd\u7559\u65f6\u957f<\/td>\n<\/tr>\n<tr>\n<td>UserProperty<\/td>\n<td>\u81ea\u5b9a\u4e49\u952e\u503c\u5bf9&#xff08;\u5982{&#034;device_type&#034;: &#034;sensor&#034;}&#xff09;<\/td>\n<td>\u4e1a\u52a1\u6807\u8bc6\u4e0e\u6570\u636e\u5206\u7c7b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>1.2 \u5b9e\u6218\u573a\u666f&#xff1a;\u4ece\u201c\u88ab\u52a8\u5904\u7406\u201d\u5230\u201c\u4e3b\u52a8\u63a7\u5236\u201d<\/h4>\n<p>\u573a\u666f1&#xff1a;\u52a8\u6001\u6743\u9650\u56de\u6536\u4e0e\u901a\u77e5<br \/>\n\u667a\u80fd\u5bb6\u5c45\u5e73\u53f0\u68c0\u6d4b\u5230\u67d0\u8bbe\u5907\u5b58\u5728\u5f02\u5e38\u884c\u4e3a&#xff08;\u5982\u9891\u7e41\u53d1\u9001\u5f02\u5e38\u6307\u4ee4&#xff09;&#xff0c;\u9700\u7acb\u5373\u62d2\u7edd\u5176\u8fde\u63a5\u5e76\u8bf4\u660e\u539f\u56e0&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u670d\u52a1\u7aef\u5904\u7406\u8fde\u63a5\u8bf7\u6c42&#xff08;\u4f2a\u4ee3\u7801&#xff09;<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">on_connect<\/span><span class=\"token punctuation\">(<\/span>client_id<span class=\"token punctuation\">,<\/span> username<span class=\"token punctuation\">,<\/span> password<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> is_banned<span class=\"token punctuation\">(<\/span>client_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token comment\"># \u8fd4\u56de\u5931\u8d25\u539f\u56e0\u7801&#043;\u63cf\u8ff0<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token string\">&#034;reason_code&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">0x87<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\"># \u672a\u6388\u6743<\/span><br \/>\n            <span class=\"token string\">&#034;properties&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token string\">&#034;ReasonString&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#034;Device banned due to abnormal behavior&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token string\">&#034;UserProperty&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;ban_time&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;2024-08-01T12:00:00&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">else<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;reason_code&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">0x00<\/span><span class=\"token punctuation\">}<\/span>  <span class=\"token comment\"># \u8fde\u63a5\u6210\u529f<\/span><\/p>\n<p>\u5ba2\u6237\u7aef\u6536\u5230\u540e&#xff0c;\u53ef\u6839\u636eReasonString\u5411\u7528\u6237\u5c55\u793a\u660e\u786e\u63d0\u793a&#xff08;\u5982\u201c\u8bbe\u5907\u5df2\u88ab\u4e34\u65f6\u7981\u7528&#xff0c;\u8bf7\u8054\u7cfb\u5ba2\u670d\u201d&#xff09;&#xff0c;\u800c\u975e\u6a21\u7cca\u7684\u201c\u8fde\u63a5\u5931\u8d25\u201d\u3002<\/p>\n<p>\u573a\u666f2&#xff1a;\u8ba2\u9605\u6743\u9650\u7cbe\u7ec6\u5316\u63a7\u5236<br \/>\n\u5de5\u4e1a\u63a7\u5236\u7cfb\u7edf\u4e2d&#xff0c;\u4e0d\u540c\u89d2\u8272\u7684\u5ba2\u6237\u7aef\u8ba2\u9605\u6743\u9650\u4e0d\u540c&#xff08;\u5982\u64cd\u4f5c\u5458\u53ef\u8ba2\u9605cmd\/#&#xff0c;\u8bbf\u5ba2\u4ec5\u80fd\u8ba2\u9605data\/#&#xff09;&#xff0c;\u5f53\u8bbf\u5ba2\u5c1d\u8bd5\u8ba2\u9605cmd\/#\u65f6&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u670d\u52a1\u7aef\u5904\u7406\u8ba2\u9605\u8bf7\u6c42&#xff08;\u4f2a\u4ee3\u7801&#xff09;<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">on_subscribe<\/span><span class=\"token punctuation\">(<\/span>client_id<span class=\"token punctuation\">,<\/span> topics<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    responses <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> topic <span class=\"token keyword\">in<\/span> topics<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> topic <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;cmd\/#&#034;<\/span> <span class=\"token keyword\">and<\/span> get_role<span class=\"token punctuation\">(<\/span>client_id<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token string\">&#034;operator&#034;<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token comment\"># \u8ba2\u9605\u5931\u8d25&#xff0c;\u8fd4\u56de\u539f\u56e0\u7801\u548c\u5141\u8bb8\u7684\u66ff\u4ee3\u4e3b\u9898<\/span><br \/>\n            responses<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token string\">&#034;topic&#034;<\/span><span class=\"token punctuation\">:<\/span> topic<span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token string\">&#034;reason_code&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">0x87<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\"># \u65e0\u6743\u9650<\/span><br \/>\n                <span class=\"token string\">&#034;properties&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token string\">&#034;ReasonString&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#034;Only operators can subscribe to cmd\/#&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                    <span class=\"token string\">&#034;UserProperty&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;allowed_topic&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;data\/#&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">else<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            responses<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;topic&#034;<\/span><span class=\"token punctuation\">:<\/span> topic<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;reason_code&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">0x00<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> responses<\/p>\n<p>\u5ba2\u6237\u7aef\u53ef\u6839\u636e\u8fd4\u56de\u7684allowed_topic\u81ea\u52a8\u5207\u6362\u8ba2\u9605&#xff0c;\u63d0\u5347\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n<h4>1.3 \u907f\u5751\u6307\u5357&#xff1a;\u8fd9\u4e9b\u9519\u8bef\u53ef\u80fd\u81f4\u547d<\/h4>\n<ul>\n<li>\n<p>\u5751\u70b91&#xff1a;\u5ba2\u6237\u7aef\u5e93\u4e0d\u652f\u6301\u539f\u56e0\u7801\u89e3\u6790<br \/>\n\u67d0\u5145\u7535\u6869\u5e73\u53f0\u4f7f\u7528\u8001\u65e7MQTT.js\u5e93&#xff08;v3.x&#xff09;&#xff0c;\u8be5\u5e93\u5c06SUBACK\u4e2d\u7684\u5931\u8d25\u539f\u56e0\u7801&#xff08;\u59820x87&#xff09;\u9519\u8bef\u89e3\u6790\u4e3aQoS\u503c&#xff08;\u8fd4\u56deqos: 135&#xff09;&#xff0c;\u5bfc\u81f4\u5ba2\u6237\u7aef\u8bef\u4ee5\u4e3a\u8ba2\u9605\u6210\u529f&#xff0c;\u6700\u7ec8\u56e0\u672a\u6536\u5230\u63a7\u5236\u6307\u4ee4\u5f15\u53d1\u8bbe\u5907\u79bb\u7ebf\u3002<br \/>\n\u89e3\u51b3&#xff1a;<\/p>\n<ul>\n<li>\u5347\u7ea7\u5ba2\u6237\u7aef\u5e93\u81f3\u652f\u63015.0\u7684\u7248\u672c&#xff08;\u5982MQTT.js v4&#043;&#xff09;&#xff1b;<\/li>\n<li>\u521d\u59cb\u5316\u5ba2\u6237\u7aef\u65f6\u660e\u786e\u6307\u5b9a\u534f\u8bae\u7248\u672c&#xff1a;<span class=\"token keyword\">const<\/span> client <span class=\"token operator\">&#061;<\/span> mqtt<span class=\"token punctuation\">.<\/span><span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;mqtt:\/\/broker&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span> protocolVersion<span class=\"token operator\">:<\/span> <span class=\"token number\">5<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5751\u70b92&#xff1a;\u5ffd\u7565\u5931\u8d25\u539f\u56e0\u7801&#xff0c;\u5bfc\u81f4\u5b89\u5168\u6f0f\u6d1e<br \/>\n\u67d0\u8f66\u8054\u7f51\u5e73\u53f0\u672a\u5904\u7406CONNACK\u4e2d\u76840x87&#xff08;\u672a\u6388\u6743&#xff09;&#xff0c;\u5ba2\u6237\u7aef\u91cd\u8bd5\u65f6\u4f7f\u7528\u65e7\u8bc1\u4e66\u4ecd\u80fd\u8fde\u63a5&#xff08;\u5b9e\u9645\u662f\u670d\u52a1\u7aef\u903b\u8f91\u6f0f\u6d1e&#xff09;&#xff0c;\u6700\u7ec8\u5bfc\u81f4\u653b\u51fb\u8005\u5229\u7528\u8fc7\u671f\u8bc1\u4e66\u63a5\u5165\u7cfb\u7edf\u3002<br \/>\n\u89e3\u51b3&#xff1a;<\/p>\n<ul>\n<li>\u5ba2\u6237\u7aef\u5fc5\u987b\u6821\u9a8c\u6240\u6709\u64cd\u4f5c\u7684\u539f\u56e0\u7801&#xff0c;\u5931\u8d25\u65f6\u89e6\u53d1\u544a\u8b66&#xff1b;<\/li>\n<li>\u5173\u952e\u573a\u666f&#xff08;\u5982\u63a7\u5236\u6307\u4ee4\u53d1\u9001&#xff09;\u9700\u53cc\u91cd\u786e\u8ba4&#xff1a;<span class=\"token keyword\">def<\/span> <span class=\"token function\">publish_control_command<\/span><span class=\"token punctuation\">(<\/span>topic<span class=\"token punctuation\">,<\/span> payload<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    result <span class=\"token operator\">&#061;<\/span> client<span class=\"token punctuation\">.<\/span>publish<span class=\"token punctuation\">(<\/span>topic<span class=\"token punctuation\">,<\/span> payload<span class=\"token punctuation\">,<\/span> qos<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> result<span class=\"token punctuation\">.<\/span>reason_code <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0x00<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        log<span class=\"token punctuation\">.<\/span>error<span class=\"token punctuation\">(<\/span><span class=\"token string-interpolation\"><span class=\"token string\">f&#034;Publish failed: <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>result<span class=\"token punctuation\">.<\/span>reason_string<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n        trigger_alert<span class=\"token punctuation\">(<\/span><span class=\"token string-interpolation\"><span class=\"token string\">f&#034;Control command failed: <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>result<span class=\"token punctuation\">.<\/span>reason_string<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5751\u70b93&#xff1a;\u8fc7\u5ea6\u4f7f\u7528\u81ea\u5b9a\u4e49\u5c5e\u6027\u5bfc\u81f4\u62a5\u6587\u8fc7\u5927<br \/>\n\u67d0\u56e2\u961f\u5728\u6bcf\u6761\u6d88\u606f\u4e2d\u6dfb\u52a010&#043;UserProperty&#xff08;\u5982\u8bbe\u5907\u578b\u53f7\u3001\u56fa\u4ef6\u7248\u672c\u3001\u5730\u7406\u4f4d\u7f6e\u7b49&#xff09;&#xff0c;\u5bfc\u81f4\u5355\u6761\u62a5\u6587\u8d85\u8fc7Broker\u9650\u5236&#xff08;Maximum Packet Size&#xff09;&#xff0c;\u88ab\u62d2\u7edd\u63a5\u6536\u3002<br \/>\n\u89e3\u51b3&#xff1a;<\/p>\n<ul>\n<li>\u81ea\u5b9a\u4e49\u5c5e\u6027\u4ec5\u4f20\u9012\u5fc5\u8981\u4fe1\u606f&#xff0c;\u975e\u5fc5\u8981\u6570\u636e\u901a\u8fc7\u4e3b\u9898\u5206\u5c42&#xff08;\u5982device\/type&#061;temp\/model&#061;A1\/&#8230;&#xff09;&#xff1b;<\/li>\n<li>\u5ba2\u6237\u7aef\u53d1\u9001\u524d\u68c0\u67e5\u62a5\u6587\u5927\u5c0f&#xff1a;<span class=\"token keyword\">def<\/span> <span class=\"token function\">check_packet_size<\/span><span class=\"token punctuation\">(<\/span>payload<span class=\"token punctuation\">,<\/span> properties<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    estimated_size <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>payload<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token builtin\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>k<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">for<\/span> k<span class=\"token punctuation\">,<\/span> v <span class=\"token keyword\">in<\/span> properties<span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> estimated_size <span class=\"token operator\">&gt;<\/span> MAX_PACKET_SIZE<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">raise<\/span> ValueError<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Packet too large&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u4e8c\u3001\u5171\u4eab\u8ba2\u9605&#xff08;Shared Subscriptions&#xff09;&#xff1a;\u8d1f\u8f7d\u5747\u8861\u7684\u6838\u5fc3\u5229\u5668<\/h3>\n<p>MQTT 3.1.1\u4e2d&#xff0c;\u540c\u4e00\u4e3b\u9898\u7684\u8ba2\u9605\u8005\u4f1a\u6536\u5230\u6240\u6709\u6d88\u606f&#xff08;\u5e7f\u64ad\u6a21\u5f0f&#xff09;&#xff0c;\u65e0\u6cd5\u5b9e\u73b0\u201c\u4e00\u6761\u6d88\u606f\u4ec5\u88ab\u4e00\u4e2a\u8ba2\u9605\u8005\u5904\u7406\u201d&#xff08;\u5982\u6d88\u8d39\u961f\u5217&#xff09;\u3002\u5171\u4eab\u8ba2\u9605\u901a\u8fc7\u5f15\u5165\u201c\u8ba2\u9605\u7ec4\u201d\u673a\u5236&#xff0c;\u89e3\u51b3\u4e86\u8ba2\u9605\u4fa7\u8d1f\u8f7d\u5747\u8861\u95ee\u9898&#xff0c;\u5c24\u5176\u9002\u5408\u9ad8\u5e76\u53d1\u6d88\u606f\u5904\u7406\u573a\u666f\u3002<\/p>\n<h4>2.1 \u6280\u672f\u673a\u5236&#xff1a;\u4ece\u201c\u5e7f\u64ad\u201d\u5230\u201c\u5206\u53d1\u201d<\/h4>\n<p>\u6838\u5fc3\u8bed\u6cd5&#xff1a;<br \/>\n\u5171\u4eab\u8ba2\u9605\u7684\u4e3b\u9898\u683c\u5f0f\u4e3a $share\/{group_name}\/{topic_filter}&#xff0c;\u5176\u4e2d&#xff1a;<\/p>\n<ul>\n<li>{group_name}&#xff1a;\u8ba2\u9605\u7ec4\u540d\u79f0&#xff08;\u81ea\u5b9a\u4e49\u5b57\u7b26\u4e32&#xff0c;\u5982group_north&#xff09;&#xff1b;<\/li>\n<li>{topic_filter}&#xff1a;\u5b9e\u9645\u8ba2\u9605\u7684\u4e3b\u9898&#xff08;\u652f\u6301\u901a\u914d\u7b26&#xff0c;\u5982cmd\/&#043;\/data&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u5de5\u4f5c\u539f\u7406&#xff1a;<\/p>\n<ul>\n<li>\u540c\u4e00\u8ba2\u9605\u7ec4\u5185\u7684\u591a\u4e2a\u5ba2\u6237\u7aef\u5171\u4eab\u6d88\u606f\u6d41&#xff0c;Broker\u5c06\u6d88\u606f\u968f\u673a\u5206\u53d1\u7ed9\u7ec4\u5185\u4e00\u4e2a\u5728\u7ebf\u5ba2\u6237\u7aef&#xff1b;<\/li>\n<li>\u5ba2\u6237\u7aef\u79bb\u7ebf\u65f6&#xff0c;Broker\u81ea\u52a8\u5c06\u6d88\u606f\u5206\u53d1\u7ed9\u5176\u4ed6\u5728\u7ebf\u6210\u5458&#xff1b;<\/li>\n<li>\u4e0d\u540c\u8ba2\u9605\u7ec4\u4e4b\u95f4\u76f8\u4e92\u72ec\u7acb&#xff08;\u5982$share\/group1\/topic\u4e0e$share\/group2\/topic\u662f\u4e24\u4e2a\u72ec\u7acb\u7684\u5171\u4eab\u8ba2\u9605&#xff09;\u3002<\/li>\n<\/ul>\n<p>#mermaid-svg-z1v0LF11qHkCqJoJ {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-z1v0LF11qHkCqJoJ .error-icon{fill:#552222;}#mermaid-svg-z1v0LF11qHkCqJoJ .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-z1v0LF11qHkCqJoJ .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-z1v0LF11qHkCqJoJ .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-z1v0LF11qHkCqJoJ .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-z1v0LF11qHkCqJoJ .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-z1v0LF11qHkCqJoJ .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-z1v0LF11qHkCqJoJ .marker{fill:#333333;stroke:#333333;}#mermaid-svg-z1v0LF11qHkCqJoJ .marker.cross{stroke:#333333;}#mermaid-svg-z1v0LF11qHkCqJoJ svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-z1v0LF11qHkCqJoJ .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-z1v0LF11qHkCqJoJ .cluster-label text{fill:#333;}#mermaid-svg-z1v0LF11qHkCqJoJ .cluster-label span{color:#333;}#mermaid-svg-z1v0LF11qHkCqJoJ .label text,#mermaid-svg-z1v0LF11qHkCqJoJ span{fill:#333;color:#333;}#mermaid-svg-z1v0LF11qHkCqJoJ .node rect,#mermaid-svg-z1v0LF11qHkCqJoJ .node circle,#mermaid-svg-z1v0LF11qHkCqJoJ .node ellipse,#mermaid-svg-z1v0LF11qHkCqJoJ .node polygon,#mermaid-svg-z1v0LF11qHkCqJoJ .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-z1v0LF11qHkCqJoJ .node .label{text-align:center;}#mermaid-svg-z1v0LF11qHkCqJoJ .node.clickable{cursor:pointer;}#mermaid-svg-z1v0LF11qHkCqJoJ .arrowheadPath{fill:#333333;}#mermaid-svg-z1v0LF11qHkCqJoJ .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-z1v0LF11qHkCqJoJ .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-z1v0LF11qHkCqJoJ .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-z1v0LF11qHkCqJoJ .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-z1v0LF11qHkCqJoJ .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-z1v0LF11qHkCqJoJ .cluster text{fill:#333;}#mermaid-svg-z1v0LF11qHkCqJoJ .cluster span{color:#333;}#mermaid-svg-z1v0LF11qHkCqJoJ 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-z1v0LF11qHkCqJoJ :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<span id=\"L-L-A-B\" class=\"edgeLabel L-LS-A&#039; L-LE-B\">\u53d1\u5e03\u6d88\u606f\u5230topic\/1<\/span><span id=\"L-L-B-C\" class=\"edgeLabel L-LS-B&#039; L-LE-C\">\u5206\u53d11\u6761\u6d88\u606f<\/span><span id=\"L-L-B-D\" class=\"edgeLabel L-LS-B&#039; L-LE-D\">\u4e0d\u5206\u53d1<\/span><span id=\"L-L-B-E\" class=\"edgeLabel L-LS-B&#039; L-LE-E\">\u5206\u53d11\u6761\u6d88\u606f<\/span>\u6d88\u606f\u53d1\u5e03\u8005Broker$share\/group1\/topic\/# \u5ba2\u6237\u7aef1$share\/group1\/topic\/# \u5ba2\u6237\u7aef2$share\/group2\/topic\/# \u5ba2\u6237\u7aef3<\/p>\n<h4>2.2 \u5b9e\u6218\u573a\u666f&#xff1a;\u4ece\u201c\u5355\u70b9\u74f6\u9888\u201d\u5230\u201c\u96c6\u7fa4\u5206\u6d41\u201d<\/h4>\n<p>\u573a\u666f1&#xff1a;\u5343\u4e07\u7ea7\u8bbe\u5907\u6307\u4ee4\u5904\u7406<br \/>\n\u7f51\u7ea6\u8f66\u5e73\u53f0\u9700\u5411\u767e\u4e07\u8f66\u8f86\u53d1\u9001\u5b9e\u65f6\u8def\u5f84\u66f4\u65b0&#xff0c;\u5355\u670d\u52a1\u5668\u65e0\u6cd5\u5904\u7406\u9ad8\u5e76\u53d1&#xff0c;\u9700\u591a\u670d\u52a1\u5668\u5206\u62c5\u8d1f\u8f7d&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u670d\u52a1\u56681&#xff1a;\u5904\u7406\u534e\u5317\u533a\u57df\u8f66\u8f86\u6307\u4ee4<\/span><br \/>\nmosquitto_sub -t <span class=\"token string\">&#039;<span class=\"token variable\">$share<\/span>\/group_north\/cmd\/vehicle\/#&#039;<\/span> -h broker<\/p>\n<p><span class=\"token comment\"># \u670d\u52a1\u56682&#xff1a;\u5904\u7406\u534e\u5317\u533a\u57df\u8f66\u8f86\u6307\u4ee4&#xff08;\u540c\u7ec4&#xff0c;\u5206\u62c5\u8d1f\u8f7d&#xff09;<\/span><br \/>\nmosquitto_sub -t <span class=\"token string\">&#039;<span class=\"token variable\">$share<\/span>\/group_north\/cmd\/vehicle\/#&#039;<\/span> -h broker<\/p>\n<p><span class=\"token comment\"># \u670d\u52a1\u56683&#xff1a;\u5904\u7406\u534e\u4e1c\u533a\u57df\u8f66\u8f86\u6307\u4ee4&#xff08;\u72ec\u7acb\u7ec4&#xff0c;\u4e0e\u534e\u5317\u9694\u79bb&#xff09;<\/span><br \/>\nmosquitto_sub -t <span class=\"token string\">&#039;<span class=\"token variable\">$share<\/span>\/group_east\/cmd\/vehicle\/#&#039;<\/span> -h broker<\/p>\n<ul>\n<li>\u53d1\u5e03\u5230cmd\/vehicle\/beijing\/123\u7684\u6d88\u606f&#xff0c;\u4ec5\u4f1a\u88abgroup_north\u7ec4\u4e2d\u7684\u4e00\u53f0\u670d\u52a1\u5668\u63a5\u6536&#xff1b;<\/li>\n<li>\u53d1\u5e03\u5230cmd\/vehicle\/shanghai\/456\u7684\u6d88\u606f&#xff0c;\u4ec5\u4f1a\u88abgroup_east\u7ec4\u4e2d\u7684\u4e00\u53f0\u670d\u52a1\u5668\u63a5\u6536\u3002<\/li>\n<\/ul>\n<p>\u573a\u666f2&#xff1a;\u8bbe\u5907\u72b6\u6001\u76d1\u63a7\u544a\u8b66<br \/>\n\u667a\u6167\u56ed\u533a\u670910\u4e07\u53f0\u8bbe\u5907&#xff0c;\u9700\u5b9e\u65f6\u76d1\u63a7\u72b6\u6001\u5e76\u89e6\u53d1\u544a\u8b66&#xff08;\u5982\u6e29\u5ea6\u8fc7\u9ad8&#xff09;&#xff0c;\u5355\u544a\u8b66\u670d\u52a1\u5904\u7406\u80fd\u529b\u4e0d\u8db3&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u544a\u8b66\u670d\u52a1\u96c6\u7fa4&#xff08;3\u4e2a\u5b9e\u4f8b&#xff0c;\u540c\u5c5ealarm_group&#xff09;<\/span><br \/>\n<span class=\"token keyword\">for<\/span> i <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    client <span class=\"token operator\">&#061;<\/span> mqtt<span class=\"token punctuation\">.<\/span>Client<span class=\"token punctuation\">(<\/span>protocol<span class=\"token operator\">&#061;<\/span>mqtt<span class=\"token punctuation\">.<\/span>MQTTv5<span class=\"token punctuation\">)<\/span><br \/>\n    client<span class=\"token punctuation\">.<\/span>connect<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;broker&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># \u5171\u4eab\u8ba2\u9605\u8bbe\u5907\u72b6\u6001\u4e3b\u9898<\/span><br \/>\n    client<span class=\"token punctuation\">.<\/span>subscribe<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;$share\/alarm_group\/device\/&#043;\/status&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    client<span class=\"token punctuation\">.<\/span>loop_start<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<ul>\n<li>\u8bbe\u5907device\/10086\u53d1\u9001\u7684\u544a\u8b66\u6d88\u606f&#xff0c;\u4ec5\u88ab3\u4e2a\u5b9e\u4f8b\u4e2d\u7684\u4e00\u4e2a\u5904\u7406&#xff0c;\u907f\u514d\u91cd\u590d\u544a\u8b66&#xff1b;<\/li>\n<li>\u82e5\u5176\u4e2d\u4e00\u4e2a\u5b9e\u4f8b\u5b95\u673a&#xff0c;Broker\u81ea\u52a8\u5c06\u6d88\u606f\u5206\u53d1\u5230\u5269\u4f59\u4e24\u4e2a\u5b9e\u4f8b&#xff0c;\u65e0\u5355\u70b9\u6545\u969c\u3002<\/li>\n<\/ul>\n<h4>2.3 \u6027\u80fd\u5bf9\u6bd4\u4e0e\u4f18\u5316&#xff1a;\u4ece\u201c\u80fd\u7528\u201d\u5230\u201c\u9ad8\u6548\u201d<\/h4>\n<p>\u4f20\u7edf\u8ba2\u9605 vs \u5171\u4eab\u8ba2\u9605\u6027\u80fd\u5bf9\u6bd4&#xff08;\u57fa\u4e8eEMQX 5.0&#xff0c;8\u683832G\u670d\u52a1\u5668&#xff09;&#xff1a;<\/p>\n<table>\n<tr>\u6307\u6807\u4f20\u7edf\u8ba2\u9605&#xff08;3\u4e2a\u8ba2\u9605\u8005&#xff09;\u5171\u4eab\u8ba2\u9605&#xff08;3\u4e2a\u8ba2\u9605\u8005&#xff0c;\u540c\u7ec4&#xff09;\u63d0\u5347\u5e45\u5ea6<\/tr>\n<tbody>\n<tr>\n<td>\u5355\u8282\u70b9\u6700\u5927\u541e\u5410\u91cf<\/td>\n<td>5,000 msg\/s&#xff08;\u6bcf\u6761\u6d88\u606f\u88ab3\u4e2a\u8ba2\u9605\u8005\u5904\u7406&#xff0c;\u603b\u8d1f\u8f7d15,000 msg\/s&#xff09;<\/td>\n<td>15,000 msg\/s&#xff08;\u6bcf\u6761\u6d88\u606f\u4ec5\u88ab1\u4e2a\u8ba2\u9605\u8005\u5904\u7406&#xff0c;\u603b\u8d1f\u8f7d15,000 msg\/s&#xff09;<\/td>\n<td>300%<\/td>\n<\/tr>\n<tr>\n<td>\u6545\u969c\u6062\u590d\u65f6\u95f4<\/td>\n<td>\u624b\u52a8\u5207\u6362&#xff08;\u5e73\u57475\u5206\u949f&#xff09;<\/td>\n<td>\u81ea\u52a8\u5207\u6362&#xff08;&lt;1\u79d2&#xff09;<\/td>\n<td>300\u500d<\/td>\n<\/tr>\n<tr>\n<td>\u8d44\u6e90\u6d88\u8017&#xff08;CPU\/\u5185\u5b58&#xff09;<\/td>\n<td>\u9ad8&#xff08;\u91cd\u590d\u5904\u7406\u6d88\u606f&#xff09;<\/td>\n<td>\u4f4e&#xff08;\u8d1f\u8f7d\u5206\u644a&#xff09;<\/td>\n<td>\u964d\u4f4e60%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4f18\u5316\u6280\u5de7&#xff1a;<\/p>\n<li>\n<p>\u8ba2\u9605\u7ec4\u9694\u79bb&#xff1a;\u6309\u4e1a\u52a1\u7c7b\u578b\/\u5730\u57df\u5212\u5206\u7ec4&#xff0c;\u907f\u514d\u201c\u7ec4\u6c61\u67d3\u201d&#xff08;\u5982\u67d0\u4e1a\u52a1\u6d88\u606f\u6324\u5360\u5176\u4ed6\u4e1a\u52a1\u8d44\u6e90&#xff09;\u3002<br \/>\n\u274c \u9519\u8bef&#xff1a;$share\/all_groups\/#&#xff08;\u6240\u6709\u4e1a\u52a1\u5171\u7528\u4e00\u7ec4&#xff09;<br \/>\n\u2705 \u6b63\u786e&#xff1a;$share\/temp_sensor_alarm\/device\/temp\/&#043;\/alarm\u3001$share\/door_sensor_alarm\/device\/door\/&#043;\/alarm<\/p>\n<\/li>\n<li>\n<p>\u63a7\u5236\u7ec4\u5185\u5ba2\u6237\u7aef\u6570\u91cf&#xff1a;\u7ec4\u5185\u5ba2\u6237\u7aef\u8fc7\u591a&#xff08;\u5982&gt;100&#xff09;\u4f1a\u589e\u52a0Broker\u5206\u53d1\u5f00\u9500&#xff0c;\u5efa\u8bae\u6bcf\u7ec42-10\u4e2a\u5ba2\u6237\u7aef&#xff0c;\u901a\u8fc7\u589e\u52a0\u7ec4\u6570\u6269\u5c55&#xff08;\u5982group_north_1\u3001group_north_2&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>\u76d1\u63a7\u8d1f\u8f7d\u5747\u8861\u72b6\u6001&#xff1a;\u901a\u8fc7Broker\u7684$SYS\u4e3b\u9898\u76d1\u63a7\u7ec4\u5185\u6d88\u606f\u5206\u53d1\u662f\u5426\u5747\u8861&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u67e5\u770b\u5171\u4eab\u8ba2\u9605\u7ec4\u6d88\u606f\u5206\u53d1\u7edf\u8ba1<\/span><br \/>\nmosquitto_sub -t <span class=\"token string\">&#039;<span class=\"token variable\">$SYS<\/span>\/broker\/shared_subscription\/group_north\/messages&#039;<\/span><\/p>\n<p>\u82e5\u67d0\u5ba2\u6237\u7aef\u63a5\u6536\u6d88\u606f\u5360\u6bd4\u8d85\u8fc740%&#xff0c;\u53ef\u80fd\u5b58\u5728\u7f51\u7edc\u5ef6\u8fdf\u6216\u5904\u7406\u80fd\u529b\u4e0d\u8db3&#xff0c;\u9700\u6392\u67e5\u3002<\/p>\n<\/li>\n<h4>2.4 \u907f\u5751\u6307\u5357&#xff1a;\u8fd9\u4e9b\u573a\u666f\u5bb9\u6613\u51fa\u9519<\/h4>\n<ul>\n<li>\n<p>\u5751\u70b91&#xff1a;\u7ec4\u540d\u4f7f\u7528\u7279\u6b8a\u5b57\u7b26\u5bfc\u81f4\u8ba2\u9605\u5931\u8d25<br \/>\n\u67d0\u56e2\u961f\u4f7f\u7528$share\/group$1\/topic&#xff08;\u7ec4\u540d\u542b$&#xff09;&#xff0c;Broker\u5c06$1\u89e3\u6790\u4e3a\u534f\u8bae\u4fdd\u7559\u5b57\u7b26&#xff0c;\u5bfc\u81f4\u8ba2\u9605\u65e0\u6548\u3002<br \/>\n\u89e3\u51b3&#xff1a;\u7ec4\u540d\u4ec5\u4f7f\u7528\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf&#xff08;_&#xff09;\u548c\u8fde\u5b57\u7b26&#xff08;-&#xff09;&#xff0c;\u5982group_1\u3001north-zone\u3002<\/p>\n<\/li>\n<li>\n<p>\u5751\u70b92&#xff1a;\u4e0d\u540c\u4e1a\u52a1\u6df7\u7528\u540c\u4e00\u7ec4\u5bfc\u81f4\u6d88\u606f\u9519\u914d<br \/>\n\u67d0\u7269\u6d41\u5e73\u53f0\u5c06\u4ed3\u50a8\u673a\u5668\u4eba\u4e0e\u5361\u8f66\u8c03\u5ea6\u7684\u8ba2\u9605\u653e\u5728\u540c\u4e00\u7ec4$share\/logistics\/#&#xff0c;\u5bfc\u81f4\u673a\u5668\u4eba\u6536\u5230\u5361\u8f66\u8c03\u5ea6\u6307\u4ee4&#xff08;\u4e3b\u9898cmd\/truck\/123&#xff09;&#xff0c;\u5f15\u53d1\u64cd\u4f5c\u6df7\u4e71\u3002<br \/>\n\u89e3\u51b3&#xff1a;\u4e3b\u9898\u8fc7\u6ee4\u9700\u7cbe\u786e&#xff0c;\u7ec4\u540d\u4e0e\u4e1a\u52a1\u5f3a\u5173\u8054&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u4ed3\u50a8\u673a\u5668\u4eba\u4e13\u7528\u7ec4<\/span><br \/>\n<span class=\"token variable\">$share<\/span>\/logistics_robot\/cmd\/robot\/&#043;\/task<br \/>\n<span class=\"token comment\"># \u5361\u8f66\u8c03\u5ea6\u4e13\u7528\u7ec4<\/span><br \/>\n<span class=\"token variable\">$share<\/span>\/logistics_truck\/cmd\/truck\/&#043;\/task<\/p>\n<\/li>\n<li>\n<p>\u5751\u70b93&#xff1a;\u4f9d\u8d56\u5171\u4eab\u8ba2\u9605\u5b9e\u73b0\u4e25\u683c\u987a\u5e8f<br \/>\n\u67d0\u91d1\u878d\u4ea4\u6613\u7cfb\u7edf\u901a\u8fc7\u5171\u4eab\u8ba2\u9605\u5904\u7406\u8ba2\u5355\u6d88\u606f&#xff0c;\u671f\u671b\u6d88\u606f\u6309\u53d1\u5e03\u987a\u5e8f\u5904\u7406&#xff0c;\u4f46Broker\u7684\u968f\u673a\u5206\u53d1\u53ef\u80fd\u5bfc\u81f4\u540e\u53d1\u7684\u6d88\u606f\u88ab\u5148\u5904\u7406&#xff08;\u5982\u8ba2\u5355A\u5148\u53d1\u5e03&#xff0c;\u5374\u88ab\u540e\u542f\u52a8\u7684\u5ba2\u6237\u7aef\u63a5\u6536&#xff09;\u3002<br \/>\n\u89e3\u51b3&#xff1a;\u5171\u4eab\u8ba2\u9605\u4e0d\u4fdd\u8bc1\u6d88\u606f\u987a\u5e8f&#xff0c;\u9700\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5f25\u8865&#xff1a;<\/p>\n<ul>\n<li>\u6d88\u606f\u4e2d\u643a\u5e26\u5e8f\u5217\u53f7&#xff08;\u5982{&#034;seq&#034;: 123, &#034;data&#034;: &#034;&#8230;&#034;}&#xff09;&#xff0c;\u5ba2\u6237\u7aef\u63a5\u6536\u540e\u6309\u5e8f\u5217\u53f7\u6392\u5e8f&#xff1b;<\/li>\n<li>\u5bf9\u6709\u5e8f\u6027\u8981\u6c42\u9ad8\u7684\u573a\u666f&#xff0c;\u4f7f\u7528\u5355\u8ba2\u9605\u8005&#043;\u591a\u7ebf\u7a0b\u5904\u7406&#xff08;\u800c\u975e\u591a\u8ba2\u9605\u8005&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u4e09\u3001\u6d88\u606f\u8fc7\u671f&#xff08;Message Expiry&#xff09;&#xff1a;\u65f6\u6548\u6027\u6570\u636e\u7684\u5b88\u62a4\u8005<\/h3>\n<p>MQTT 3.1.1\u4e2d&#xff0c;\u6d88\u606f\u4e00\u65e6\u53d1\u5e03&#xff0c;\u4f1a\u88abBroker\u6c38\u4e45\u5b58\u50a8&#xff08;\u9664\u975e\u624b\u52a8\u6e05\u9664&#xff09;&#xff0c;\u5373\u4f7f\u6d88\u606f\u5df2\u5931\u53bb\u65f6\u6548\u6027&#xff08;\u598210\u5206\u949f\u524d\u7684\u4ea4\u901a\u8def\u51b5&#xff09;\u3002MQTT 5.0\u7684MessageExpiryInterval\u5c5e\u6027\u5141\u8bb8\u8bbe\u7f6e\u6d88\u606f\u751f\u547d\u5468\u671f&#xff0c;\u8fc7\u671f\u540e\u81ea\u52a8\u4e22\u5f03&#xff0c;\u907f\u514d\u65e0\u6548\u6570\u636e\u5360\u7528\u8d44\u6e90\u3002<\/p>\n<h4>3.1 \u6280\u672f\u673a\u5236&#xff1a;\u4ece\u201c\u6c38\u4e45\u5b58\u50a8\u201d\u5230\u201c\u81ea\u52a8\u6e05\u7406\u201d<\/h4>\n<p>\u6838\u5fc3\u53c2\u6570&#xff1a;<br \/>\nMessageExpiryInterval&#xff08;\u6d88\u606f\u8fc7\u671f\u95f4\u9694&#xff09;&#xff1a;\u5355\u4f4d\u4e3a\u79d2&#xff0c;\u5b9a\u4e49\u6d88\u606f\u4ece\u53d1\u5e03\u5230\u8fc7\u671f\u7684\u6700\u5927\u65f6\u957f\u3002<\/p>\n<p>\u5de5\u4f5c\u6d41\u7a0b&#xff1a;<\/p>\n<li>\u53d1\u5e03\u8005\u8bbe\u7f6eMessageExpiryInterval: 60&#xff08;\u6d88\u606f\u6709\u6548\u671f60\u79d2&#xff09;&#xff1b;<\/li>\n<li>Broker\u63a5\u6536\u6d88\u606f\u65f6&#xff0c;\u8bb0\u5f55\u5269\u4f59\u751f\u5b58\u65f6\u95f4&#xff08;60\u79d2 &#8211; \u4f20\u8f93\u8017\u65f6&#xff0c;\u7ea659\u79d2&#xff09;&#xff1b;<\/li>\n<li>\u82e5\u6d88\u606f\u9700\u8f6c\u53d1\u7ed9\u79bb\u7ebf\u5ba2\u6237\u7aef&#xff08;\u6301\u4e45\u4f1a\u8bdd&#xff09;&#xff0c;Broker\u5b58\u50a8\u65f6\u8ba1\u7b97\u5269\u4f59\u65f6\u95f4&#xff1b;<\/li>\n<li>\u5f53\u5269\u4f59\u65f6\u95f4\u22640&#xff0c;Broker\u81ea\u52a8\u4e22\u5f03\u6d88\u606f&#xff0c;\u4e0d\u518d\u8f6c\u53d1\u6216\u5b58\u50a8\u3002<\/li>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250814054439-689d77c701a37.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>3.2 \u5b9e\u6218\u573a\u666f&#xff1a;\u4ece\u201c\u6570\u636e\u5806\u79ef\u201d\u5230\u201c\u7cbe\u51c6\u6e05\u7406\u201d<\/h4>\n<p>\u573a\u666f1&#xff1a;\u5b9e\u65f6\u4ea4\u901a\u6307\u4ee4<br \/>\n\u7f51\u8054\u6c7d\u8f66\u63a5\u6536\u8def\u53e3\u901a\u884c\u5efa\u8bae&#xff08;\u5982\u201c\u7eff\u706f\u5269\u4f595\u79d2&#xff0c;\u5efa\u8bae\u65f6\u901f50km\/h\u201d&#xff09;&#xff0c;\u8be5\u6d88\u606f\u4ec5\u57285\u79d2\u5185\u6709\u6548&#xff0c;\u8fc7\u671f\u540e\u65e0\u610f\u4e49&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u4ea4\u901a\u670d\u52a1\u5668\u53d1\u5e03\u6307\u4ee4<\/span><br \/>\nclient<span class=\"token punctuation\">.<\/span>publish<span class=\"token punctuation\">(<\/span><br \/>\n    topic<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;traffic\/intersection\/8&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    payload<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#039;{&#034;green_remaining&#034;: 5, &#034;suggested_speed&#034;: 50}&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    qos<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    properties<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;MessageExpiryInterval&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">}<\/span>  <span class=\"token comment\"># \u6709\u6548\u671f5\u79d2<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<ul>\n<li>\u82e5\u8f66\u8f86\u56e0\u7f51\u7edc\u5ef6\u8fdf3\u79d2\u540e\u624d\u6536\u5230\u6d88\u606f&#xff0c;\u5269\u4f59\u6709\u6548\u671f\u4e3a2\u79d2&#xff0c;\u4ecd\u53ef\u4f7f\u7528&#xff1b;<\/li>\n<li>\u82e5\u5ef6\u8fdf\u8d85\u8fc75\u79d2&#xff0c;\u6d88\u606f\u5df2\u8fc7\u671f&#xff0c;Broker\u4f1a\u76f4\u63a5\u4e22\u5f03&#xff0c;\u907f\u514d\u8f66\u8f86\u6536\u5230\u65e0\u6548\u6307\u4ee4\u3002<\/li>\n<\/ul>\n<p>\u573a\u666f2&#xff1a;\u4e34\u65f6\u4e8b\u4ef6\u901a\u77e5<br \/>\n\u6f14\u5531\u4f1a\u573a\u9986\u5411\u89c2\u4f17\u63a8\u9001\u4e34\u65f6\u5ea7\u4f4d\u8c03\u6574\u901a\u77e5&#xff08;\u5982\u201c3\u53f7\u5385\u89c2\u4f17\u8bf7\u8f6c\u79fb\u81f35\u53f7\u5385\u201d&#xff09;&#xff0c;\u901a\u77e5\u4ec5\u5728\u5f00\u573a\u524d30\u5206\u949f\u5185\u6709\u6548&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ Java\u5ba2\u6237\u7aef\u53d1\u5e03\u901a\u77e5<\/span><br \/>\n<span class=\"token class-name\">MqttMessage<\/span> message <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MqttMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;3\u53f7\u5385\u5ea7\u4f4d\u8c03\u6574\u81f35\u53f7\u5385&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmessage<span class=\"token punctuation\">.<\/span><span class=\"token function\">setQos<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f430\u5206\u949f&#xff08;1800\u79d2&#xff09;<\/span><br \/>\n<span class=\"token class-name\">MqttProperties<\/span> properties <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MqttProperties<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nproperties<span class=\"token punctuation\">.<\/span><span class=\"token function\">setMessageExpiryInterval<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1800<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmessage<span class=\"token punctuation\">.<\/span><span class=\"token function\">setProperties<\/span><span class=\"token punctuation\">(<\/span>properties<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nclient<span class=\"token punctuation\">.<\/span><span class=\"token function\">publish<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;venue\/notice&#034;<\/span><span class=\"token punctuation\">,<\/span> message<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u5f00\u573a\u524d30\u5206\u949f\u5185\u8fdb\u5165\u573a\u9986\u7684\u89c2\u4f17\u80fd\u6536\u5230\u901a\u77e5&#xff1b;<\/li>\n<li>\u5f00\u573a\u540e\u8fdb\u5165\u7684\u89c2\u4f17&#xff08;\u8d85\u8fc730\u5206\u949f&#xff09;\u4e0d\u4f1a\u6536\u5230\u8fc7\u671f\u901a\u77e5&#xff0c;\u907f\u514d\u6df7\u6dc6\u3002<\/li>\n<\/ul>\n<p>\u573a\u666f3&#xff1a;\u81ea\u52a8\u6e05\u7406\u4fdd\u7559\u6d88\u606f<br \/>\nMQTT 3.1.1\u4e2d&#xff0c;\u4fdd\u7559\u6d88\u606f\u9700\u901a\u8fc7\u53d1\u5e03\u7a7a\u6d88\u606f\u624b\u52a8\u6e05\u9664&#xff0c;\u64cd\u4f5c\u7e41\u7410\u3002MQTT 5.0\u53ef\u8bbe\u7f6e\u4fdd\u7559\u6d88\u606f\u7684\u8fc7\u671f\u65f6\u95f4&#xff0c;\u81ea\u52a8\u6e05\u7406&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u53d1\u5e03\u4fdd\u7559\u6d88\u606f&#xff0c;\u8bbe\u7f6e30\u5929\u540e\u8fc7\u671f&#xff08;2592000\u79d2&#xff09;<\/span><br \/>\nmosquitto_pub -t <span class=\"token string\">&#034;weather\/current&#034;<\/span> -m <span class=\"token string\">&#039;{&#034;temp&#034;: 25, &#034;humid&#034;: 60}&#039;<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  -r <span class=\"token punctuation\">\\\\<\/span>  <span class=\"token comment\"># \u4fdd\u7559\u6d88\u606f<\/span><br \/>\n  &#8211;property mqtt.message-expiry-interval<span class=\"token operator\">&#061;<\/span><span class=\"token number\">2592000<\/span> <span class=\"token punctuation\">\\\\<\/span>  <span class=\"token comment\"># 30\u5929<\/span><br \/>\n  -V <span class=\"token number\">5<\/span>  <span class=\"token comment\"># \u4f7f\u7528MQTT 5.0<\/span><\/p>\n<p>30\u5929\u540e&#xff0c;Broker\u81ea\u52a8\u5220\u9664\u8be5\u4fdd\u7559\u6d88\u606f&#xff0c;\u65e0\u9700\u624b\u52a8\u5e72\u9884\u3002<\/p>\n<h4>3.3 \u907f\u5751\u6307\u5357&#xff1a;\u5e73\u8861\u65f6\u6548\u6027\u4e0e\u53ef\u9760\u6027<\/h4>\n<ul>\n<li>\n<p>\u5751\u70b91&#xff1a;\u6709\u6548\u671f\u8fc7\u77ed\u5bfc\u81f4\u5173\u952e\u6d88\u606f\u4e22\u5931<br \/>\n\u67d0\u5de5\u4e1a\u63a7\u5236\u7cfb\u7edf\u4e3a\u4f20\u611f\u5668\u6570\u636e\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f410\u79d2&#xff0c;\u4f46\u56e0\u7f51\u7edc\u6296\u52a8&#xff0c;\u6d88\u606f\u4f20\u8f93\u8017\u65f612\u79d2&#xff0c;\u88abBroker\u4e22\u5f03&#xff0c;\u5bfc\u81f4\u76d1\u63a7\u7cfb\u7edf\u6f0f\u62a5\u5f02\u5e38\u6570\u636e\u3002<br \/>\n\u89e3\u51b3&#xff1a;<\/p>\n<ul>\n<li>\u7ed3\u5408\u7f51\u7edc\u5ef6\u8fdf\u8bbe\u7f6e\u5408\u7406\u6709\u6548\u671f&#xff08;\u5982\u5ef6\u8fdfP99\u4e3a5\u79d2&#xff0c;\u5219\u6709\u6548\u671f\u81f3\u5c1110\u79d2&#xff09;&#xff1b;<\/li>\n<li>\u5173\u952e\u6d88\u606f&#xff08;\u5982\u544a\u8b66&#xff09;\u9002\u5f53\u5ef6\u957f\u6709\u6548\u671f&#xff0c;\u975e\u5173\u952e\u6d88\u606f&#xff08;\u5982\u5b9e\u65f6\u72b6\u6001&#xff09;\u53ef\u7f29\u77ed&#xff1a;<span class=\"token keyword\">def<\/span> <span class=\"token function\">get_expiry_interval<\/span><span class=\"token punctuation\">(<\/span>topic<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token string\">&#034;alarm&#034;<\/span> <span class=\"token keyword\">in<\/span> topic<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">30<\/span>  <span class=\"token comment\"># \u544a\u8b66\u6d88\u606f\u4fdd\u755930\u79d2<\/span><br \/>\n    <span class=\"token keyword\">else<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">10<\/span>  <span class=\"token comment\"># \u666e\u901a\u6d88\u606f\u4fdd\u755910\u79d2<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5751\u70b92&#xff1a;\u672a\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u5bfc\u81f4\u6301\u4e45\u4f1a\u8bdd\u5806\u79ef<br \/>\n\u67d0\u667a\u6167\u519c\u4e1a\u5e73\u53f0\u7684\u4f20\u611f\u5668\u4f7f\u7528QoS&#061;1\u548c\u6301\u4e45\u4f1a\u8bdd&#xff0c;\u672a\u8bbe\u7f6e\u6d88\u606f\u8fc7\u671f\u65f6\u95f4\u3002\u4f20\u611f\u5668\u79bb\u7ebf72\u5c0f\u65f6\u540e\u91cd\u542f&#xff0c;Broker\u5c06\u79ef\u538b\u768472\u5c0f\u65f6\u5185\u7684\u6240\u6709\u6d88\u606f&#xff08;\u6570\u4e07\u6761&#xff09;\u4e00\u6b21\u6027\u63a8\u9001&#xff0c;\u5bfc\u81f4\u8bbe\u5907\u5185\u5b58\u6ea2\u51fa\u3002<br \/>\n\u89e3\u51b3&#xff1a;<\/p>\n<ul>\n<li>\u4e3a\u6240\u6709\u901a\u8fc7\u6301\u4e45\u4f1a\u8bdd\u53d1\u9001\u7684\u6d88\u606f\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4&#xff1a;# EMQX\u9ed8\u8ba4\u8bbe\u7f6e\u6240\u6709\u6d88\u606f\u7684\u8fc7\u671f\u65f6\u95f4&#xff08;\u5168\u5c40\u914d\u7f6e&#xff09;<br \/>\nmqtt.message_expiry_interval &#061; 86400  # \u9ed8\u8ba4\u4e3a86400\u79d2&#xff08;1\u5929&#xff09;<\/p>\n<\/li>\n<li>\u5ba2\u6237\u7aef\u8fde\u63a5\u65f6\u8bbe\u7f6e\u4f1a\u8bdd\u8fc7\u671f\u95f4\u9694&#xff0c;\u907f\u514d\u4f1a\u8bdd\u957f\u671f\u4fdd\u7559&#xff1a;client<span class=\"token punctuation\">.<\/span><span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n  sessionExpiryInterval<span class=\"token operator\">:<\/span> <span class=\"token number\">86400<\/span>  <span class=\"token comment\">\/\/ \u4f1a\u8bdd\u4fdd\u75591\u5929<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5751\u70b93&#xff1a;\u8bef\u89e3\u201c\u5269\u4f59\u6709\u6548\u671f\u201d\u5bfc\u81f4\u903b\u8f91\u9519\u8bef<br \/>\n\u67d0\u5f00\u53d1\u8005\u8ba4\u4e3aMessageExpiryInterval\u662f\u201c\u6d88\u606f\u5728Broker\u5b58\u50a8\u7684\u65f6\u957f\u201d&#xff0c;\u5b9e\u9645\u662f\u201c\u4ece\u53d1\u5e03\u5230\u8fc7\u671f\u7684\u603b\u65f6\u957f\u201d\u3002\u4f8b\u5982\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f460\u79d2&#xff0c;\u6d88\u606f\u4f20\u8f93\u8017\u65f610\u79d2&#xff0c;\u5728Broker\u5b58\u50a840\u79d2\u540e\u8f6c\u53d1&#xff0c;\u5269\u4f59\u6709\u6548\u671f\u4e3a10\u79d2&#xff08;60-10-40&#061;10&#xff09;&#xff0c;\u800c\u975e60\u79d2\u3002<br \/>\n\u89e3\u51b3&#xff1a;<\/p>\n<ul>\n<li>\u5ba2\u6237\u7aef\u63a5\u6536\u6d88\u606f\u540e&#xff0c;\u9700\u6839\u636e\u5269\u4f59\u6709\u6548\u671f\u5224\u65ad\u662f\u5426\u4ecd\u53ef\u7528&#xff1a;<span class=\"token keyword\">def<\/span> <span class=\"token function\">on_message<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">,<\/span> userdata<span class=\"token punctuation\">,<\/span> msg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    remaining_expiry <span class=\"token operator\">&#061;<\/span> msg<span class=\"token punctuation\">.<\/span>properties<span class=\"token punctuation\">.<\/span>get<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;MessageExpiryInterval&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> remaining_expiry <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        log<span class=\"token punctuation\">.<\/span>warning<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Received expired message, ignoring&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><br \/>\n    process_message<span class=\"token punctuation\">(<\/span>msg<span class=\"token punctuation\">.<\/span>payload<span class=\"token punctuation\">)<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u56db\u3001\u6d41\u91cf\u63a7\u5236&#xff08;Flow Control&#xff09;&#xff1a;\u7a33\u5b9a\u6027\u4e0e\u516c\u5e73\u6027\u7684\u5e73\u8861\u672f<\/h3>\n<p>MQTT 3.1.1\u7f3a\u4e4f\u7cbe\u7ec6\u5316\u7684\u6d41\u91cf\u63a7\u5236\u673a\u5236&#xff0c;\u5f53\u5ba2\u6237\u7aef\u7a81\u53d1\u5927\u91cf\u6d88\u606f&#xff08;\u5982\u4f20\u611f\u5668\u6279\u91cf\u4e0a\u62a5&#xff09;&#xff0c;\u53ef\u80fd\u5bfc\u81f4Broker\u8fc7\u8f7d&#xff1b;\u6216\u5ba2\u6237\u7aef\u5904\u7406\u80fd\u529b\u4e0d\u8db3&#xff0c;\u65e0\u6cd5\u53ca\u65f6\u5904\u7406\u6536\u5230\u7684\u6d88\u606f&#xff0c;\u5f15\u53d1\u5185\u5b58\u79ef\u538b\u3002MQTT 5.0\u901a\u8fc7\u4e00\u7cfb\u5217\u53c2\u6570\u5b9e\u73b0\u53cc\u5411\u6d41\u91cf\u63a7\u5236&#xff0c;\u4fdd\u969c\u7cfb\u7edf\u7a33\u5b9a\u3002<\/p>\n<h4>4.1 \u6838\u5fc3\u673a\u5236&#xff1a;\u4ece\u201c\u65e0\u9650\u5236\u201d\u5230\u201c\u53ef\u63a7\u201d<\/h4>\n<p>MQTT 5.0\u901a\u8fc7\u4ee5\u4e0b\u5c5e\u6027\u5b9e\u73b0\u6d41\u91cf\u63a7\u5236&#xff0c;\u7531\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u534f\u5546\u751f\u6548&#xff1a;<\/p>\n<table>\n<tr>\u5c5e\u6027\u53d1\u9001\u65b9\u4f5c\u7528\u5178\u578b\u503c<\/tr>\n<tbody>\n<tr>\n<td>Receive Maximum<\/td>\n<td>\u5ba2\u6237\u7aef\u2192\u670d\u52a1\u7aef<\/td>\n<td>\u5ba2\u6237\u7aef\u58f0\u660e\u4e00\u6b21\u6700\u591a\u53ef\u5904\u7406\u7684\u672a\u786e\u8ba4QoS1\/2\u62a5\u6587\u6570\u91cf&#xff08;\u6ed1\u52a8\u7a97\u53e3\u5927\u5c0f&#xff09;<\/td>\n<td>16-64<\/td>\n<\/tr>\n<tr>\n<td>Maximum Packet Size<\/td>\n<td>\u5ba2\u6237\u7aef\u2194\u670d\u52a1\u7aef<\/td>\n<td>\u58f0\u660e\u53ef\u63a5\u6536\u7684\u6700\u5927\u62a5\u6587\u5c3a\u5bf8&#xff08;\u5b57\u8282&#xff09;<\/td>\n<td>256KB-4MB<\/td>\n<\/tr>\n<tr>\n<td>Topic Alias Maximum<\/td>\n<td>\u5ba2\u6237\u7aef\u2194\u670d\u52a1\u7aef<\/td>\n<td>\u58f0\u660e\u652f\u6301\u7684\u4e3b\u9898\u522b\u540d\u6570\u91cf&#xff08;\u7528\u6570\u5b57\u66ff\u4ee3\u91cd\u590d\u4e3b\u9898&#xff0c;\u51cf\u5c11\u5e26\u5bbd&#xff09;<\/td>\n<td>10-50<\/td>\n<\/tr>\n<tr>\n<td>Maximum QoS<\/td>\n<td>\u670d\u52a1\u7aef\u2192\u5ba2\u6237\u7aef<\/td>\n<td>\u670d\u52a1\u7aef\u9650\u5236\u5ba2\u6237\u7aef\u53d1\u5e03\u6d88\u606f\u7684\u6700\u9ad8QoS\u7b49\u7ea7<\/td>\n<td>0-2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5de5\u4f5c\u6d41\u7a0b&#xff1a;<\/p>\n<li>\u5ba2\u6237\u7aef\u8fde\u63a5\u65f6\u53d1\u9001Receive Maximum: 32\u3001Maximum Packet Size: 262144&#xff08;256KB&#xff09;&#xff1b;<\/li>\n<li>\u670d\u52a1\u7aef\u786e\u8ba4\u5e76\u8fd4\u56deMaximum Packet Size: 1048576&#xff08;1MB&#xff09;\u3001Maximum QoS: 1&#xff1b;<\/li>\n<li>\u53cc\u65b9\u9700\u9075\u5b88\u534f\u5546\u7ed3\u679c&#xff1a;\u5ba2\u6237\u7aef\u53d1\u5e03\u7684\u6d88\u606fQoS\u22641&#xff0c;\u5c3a\u5bf8\u22641MB&#xff1b;\u670d\u52a1\u7aef\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u672a\u786e\u8ba4QoS1\/2\u62a5\u6587\u226432\u4e2a\u3002<\/li>\n<h4>4.2 \u5b9e\u6218\u573a\u666f&#xff1a;\u4ece\u201c\u96ea\u5d29\u201d\u5230\u201c\u5e73\u7a33\u201d<\/h4>\n<p>\u573a\u666f1&#xff1a;\u9ad8\u5e76\u53d1\u7535\u8868\u6570\u636e\u91c7\u96c6<br \/>\n\u7535\u7f51\u7cfb\u7edf\u9700\u5904\u7406\u767e\u4e07\u7ea7\u667a\u80fd\u7535\u8868\u7684\u5b9e\u65f6\u8bfb\u6570&#xff08;\u6bcf10\u79d2\u4e0a\u62a5\u4e00\u6b21&#xff09;&#xff0c;\u9632\u6b62\u67d0\u4e00\u533a\u57df\u7535\u8868\u96c6\u4e2d\u4e0a\u62a5\u5bfc\u81f4Broker\u8fc7\u8f7d&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u7535\u8868\u5ba2\u6237\u7aef\u914d\u7f6e&#xff08;\u9650\u5236\u53d1\u9001\u901f\u7387&#xff09;<\/span><br \/>\n<span class=\"token class-name\">MqttConnectOptions<\/span> options <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MqttConnectOptions<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\noptions<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAutomaticReconnect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u58f0\u660e\u6700\u5927\u62a5\u6587\u5c3a\u5bf8&#xff08;1KB&#xff09;\u3001\u63a5\u6536\u7a97\u53e3&#xff08;16&#xff09;<\/span><br \/>\n<span class=\"token class-name\">MqttProperties<\/span> connectProps <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MqttProperties<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nconnectProps<span class=\"token punctuation\">.<\/span><span class=\"token function\">setMaximumPacketSize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5355\u62a5\u6587\u22641KB<\/span><br \/>\nconnectProps<span class=\"token punctuation\">.<\/span><span class=\"token function\">setReceiveMaximum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">16<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u6700\u591a16\u4e2a\u672a\u786e\u8ba4\u62a5\u6587<\/span><br \/>\noptions<span class=\"token punctuation\">.<\/span><span class=\"token function\">setProperties<\/span><span class=\"token punctuation\">(<\/span>connectProps<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ Broker\u914d\u7f6e&#xff08;\u5168\u5c40\u9650\u5236&#xff09;<\/span><br \/>\nlistener<span class=\"token punctuation\">.<\/span>tcp<span class=\"token punctuation\">.<\/span>external<span class=\"token punctuation\">.<\/span>maximum_packet_size <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1048576<\/span>  <span class=\"token comment\">\/\/ 1MB<\/span><br \/>\nlistener<span class=\"token punctuation\">.<\/span>tcp<span class=\"token punctuation\">.<\/span>external<span class=\"token punctuation\">.<\/span>rate_limit <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;10000pkts\/minute&#034;<\/span>  <span class=\"token comment\">\/\/ \u5355IP\u9650\u901f<\/span><\/p>\n<ul>\n<li>\u7535\u8868\u4e0a\u62a5\u7684\u8bfb\u6570\u62a5\u6587&#xff08;\u7ea6500\u5b57\u8282&#xff09;\u7b26\u5408\u5c3a\u5bf8\u9650\u5236&#xff1b;<\/li>\n<li>Broker\u9650\u5236\u5355IP\u6bcf\u5206\u949f\u6700\u591a10000\u4e2a\u62a5\u6587&#xff0c;\u907f\u514d\u533a\u57df\u96c6\u4e2d\u4e0a\u62a5\u51b2\u51fb\u3002<\/li>\n<\/ul>\n<p>\u573a\u666f2&#xff1a;\u5f31\u7f51\u73af\u5883\u4e0b\u7684\u8bbe\u5907\u901a\u4fe1<br \/>\n\u504f\u8fdc\u5730\u533a\u7684\u592a\u9633\u80fd\u4f20\u611f\u5668\u7f51\u7edc\u5e26\u5bbd\u6709\u9650&#xff08;\u5982GPRS\u7f51\u7edc&#xff09;&#xff0c;\u9700\u901a\u8fc7\u4e3b\u9898\u522b\u540d\u51cf\u5c11\u4f20\u8f93\u91cf&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u4f20\u611f\u5668\u5ba2\u6237\u7aef&#xff08;\u4f7f\u7528\u4e3b\u9898\u522b\u540d&#xff09;<\/span><br \/>\nclient <span class=\"token operator\">&#061;<\/span> mqtt<span class=\"token punctuation\">.<\/span>Client<span class=\"token punctuation\">(<\/span>protocol<span class=\"token operator\">&#061;<\/span>mqtt<span class=\"token punctuation\">.<\/span>MQTTv5<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\"># \u58f0\u660e\u652f\u630150\u4e2a\u4e3b\u9898\u522b\u540d<\/span><br \/>\nclient<span class=\"token punctuation\">.<\/span>connect<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;broker&#034;<\/span><span class=\"token punctuation\">,<\/span> properties<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;TopicAliasMaximum&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">50<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u7b2c\u4e00\u6b21\u53d1\u5e03&#xff1a;\u4f7f\u7528\u5b8c\u6574\u4e3b\u9898&#xff0c;\u5173\u8054\u522b\u540d1<\/span><br \/>\nclient<span class=\"token punctuation\">.<\/span>publish<span class=\"token punctuation\">(<\/span><br \/>\n    topic<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;sensor\/solar\/123\/power&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    payload<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;12.5W&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    properties<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;TopicAlias&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">}<\/span>  <span class=\"token comment\"># \u4e3b\u9898\u522b\u540d1<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u540e\u7eed\u53d1\u5e03&#xff1a;\u76f4\u63a5\u4f7f\u7528\u522b\u540d1&#xff0c;\u65e0\u9700\u91cd\u590d\u53d1\u9001\u957f\u4e3b\u9898<\/span><br \/>\nclient<span class=\"token punctuation\">.<\/span>publish<span class=\"token punctuation\">(<\/span><br \/>\n    topic_alias<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\"># \u66ff\u4ee3\u5b8c\u6574\u4e3b\u9898<\/span><br \/>\n    payload<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;13.2W&#034;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<ul>\n<li>\u957f\u4e3b\u9898&#xff08;sensor\/solar\/123\/power&#xff09;\u9996\u6b21\u4f20\u8f93\u540e&#xff0c;\u540e\u7eed\u75281\u5b57\u8282\u7684\u522b\u540d\u66ff\u4ee3&#xff0c;\u8282\u770170%\u5e26\u5bbd&#xff1b;<\/li>\n<li>\u5f31\u7f51\u73af\u5883\u4e0b\u51cf\u5c11\u4f20\u8f93\u91cf&#xff0c;\u964d\u4f4e\u4e22\u5305\u7387\u3002<\/li>\n<\/ul>\n<h4>4.3 \u6027\u80fd\u8c03\u4f18\u4e0e\u907f\u5751<\/h4>\n<p>\u8c03\u4f18\u539f\u5219&#xff1a;<\/p>\n<ul>\n<li>\u5ba2\u6237\u7aefReceive Maximum\u5e94\u6839\u636e\u5904\u7406\u80fd\u529b\u8bbe\u7f6e&#xff08;\u5982\u5355\u7ebf\u7a0b\u5904\u7406\u8bbe16&#xff0c;\u591a\u7ebf\u7a0b\u8bbe64&#xff09;&#xff1b;<\/li>\n<li>Maximum Packet Size\u9700\u5339\u914d\u4e1a\u52a1\u6d88\u606f\u5927\u5c0f&#xff08;\u5982\u4f20\u611f\u5668\u6570\u636e\u8bbe256KB&#xff0c;\u56fa\u4ef6\u5347\u7ea7\u8bbe4MB&#xff09;&#xff1b;<\/li>\n<li>\u4e3b\u9898\u91cd\u590d\u5ea6\u9ad8\u7684\u573a\u666f&#xff08;\u5982\u540c\u4e00\u8bbe\u5907\u9891\u7e41\u4e0a\u62a5&#xff09;\u5fc5\u7528Topic Alias\u3002<\/li>\n<\/ul>\n<p>\u907f\u5751\u6307\u5357&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u5751\u70b91&#xff1a;\u672a\u8bbe\u7f6eReceive Maximum\u5bfc\u81f4\u5ba2\u6237\u7aef\u8fc7\u8f7d<br \/>\n\u67d0\u5de5\u5382\u7684PLC\u5ba2\u6237\u7aef\u672a\u8bbe\u7f6eReceive Maximum&#xff08;\u9ed8\u8ba4\u65e0\u9650\u5236&#xff09;&#xff0c;Broker\u4e00\u6b21\u6027\u5411\u5176\u53d1\u90011000\u6761\u63a7\u5236\u6307\u4ee4&#xff0c;\u5bfc\u81f4PLC\u5185\u5b58\u6ea2\u51fa\u3001\u6b7b\u673a\u3002<br \/>\n\u89e3\u51b3&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u5ba2\u6237\u7aef\u660e\u786e\u9650\u5236\u672a\u786e\u8ba4\u62a5\u6587\u6570\u91cf<\/span><br \/>\nclient<span class=\"token punctuation\">.<\/span>connect<span class=\"token punctuation\">(<\/span>properties<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;ReceiveMaximum&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">32<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<\/li>\n<li>\n<p>\u5751\u70b92&#xff1a;Maximum Packet Size\u4e0d\u5339\u914d\u5bfc\u81f4\u6d88\u606f\u88ab\u62d2<br \/>\n\u5ba2\u6237\u7aef\u8bbe\u7f6eMaximum Packet Size: 65536&#xff08;64KB&#xff09;&#xff0c;\u4f46\u670d\u52a1\u7aef\u53d1\u9001\u7684\u6d88\u606f\u4e3a70KB&#xff0c;\u88ab\u5ba2\u6237\u7aef\u62d2\u7edd\u63a5\u6536&#xff0c;\u5bfc\u81f4\u63a7\u5236\u6307\u4ee4\u4e22\u5931\u3002<br \/>\n\u89e3\u51b3&#xff1a;<\/p>\n<ul>\n<li>\u670d\u52a1\u7aef\u53d1\u9001\u524d\u68c0\u67e5\u5ba2\u6237\u7aef\u652f\u6301\u7684\u6700\u5927\u5c3a\u5bf8&#xff1a;<span class=\"token comment\">% EMQX\u94a9\u5b50\u51fd\u6570&#xff1a;\u68c0\u67e5\u62a5\u6587\u5c3a\u5bf8<\/span><br \/>\n<span class=\"token function\">on_publish<\/span><span class=\"token punctuation\">(<\/span><span class=\"token variable\">Message<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token variable\">ClientMaxSize<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token atom\">maps<\/span><span class=\"token punctuation\">:<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token atom\">maximum_packet_size<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token variable\">Message<\/span><span class=\"token punctuation\">#<\/span><span class=\"token atom\">message<\/span><span class=\"token punctuation\">.<\/span><span class=\"token atom\">client_properties<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><br \/>\n        <span class=\"token function\">byte_size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token variable\">Message<\/span><span class=\"token punctuation\">#<\/span><span class=\"token atom\">message<\/span><span class=\"token punctuation\">.<\/span><span class=\"token atom\">payload<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token variable\">ClientMaxSize<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><span class=\"token atom\">error<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token atom\">packet_too_large<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token boolean\">true<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><span class=\"token atom\">ok<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token variable\">Message<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">end<\/span><span class=\"token punctuation\">.<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5751\u70b93&#xff1a;\u6ee5\u7528\u4e3b\u9898\u522b\u540d\u5bfc\u81f4\u6df7\u6dc6<br \/>\n\u67d0\u5ba2\u6237\u7aef\u9891\u7e41\u66f4\u6362\u4e3b\u9898\u522b\u540d\u6620\u5c04&#xff08;\u5982\u5c06\u522b\u540d1\u5148\u5173\u8054topic\/a&#xff0c;\u540e\u5173\u8054topic\/b&#xff09;&#xff0c;\u5bfc\u81f4Broker\u8f6c\u53d1\u6d88\u606f\u5230\u9519\u8bef\u4e3b\u9898\u3002<br \/>\n\u89e3\u51b3&#xff1a;<\/p>\n<ul>\n<li>\u4e3b\u9898\u522b\u540d\u5728\u4f1a\u8bdd\u671f\u95f4\u4fdd\u6301\u4e0d\u53d8&#xff0c;\u907f\u514d\u52a8\u6001\u4fee\u6539&#xff1b;<\/li>\n<li>\u522b\u540d\u4e0e\u4e3b\u9898\u7684\u6620\u5c04\u5173\u7cfb\u8bb0\u5f55\u5728\u5ba2\u6237\u7aef\u672c\u5730&#xff0c;\u786e\u4fdd\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u4e94\u3001\u65b0\u7279\u6027\u7ec4\u5408\u5e94\u7528&#xff1a;\u6784\u5efa\u4f01\u4e1a\u7ea7\u7269\u8054\u7f51\u7cfb\u7edf<\/h3>\n<p>\u5355\u4e00\u7279\u6027\u96be\u4ee5\u5e94\u5bf9\u590d\u6742\u573a\u666f&#xff0c;\u9700\u7ed3\u5408\u539f\u56e0\u7801\u3001\u5171\u4eab\u8ba2\u9605\u3001\u6d88\u606f\u8fc7\u671f\u4e0e\u6d41\u91cf\u63a7\u5236&#xff0c;\u6784\u5efa\u7a33\u5b9a\u3001\u9ad8\u6548\u3001\u5b89\u5168\u7684\u7269\u8054\u7f51\u7cfb\u7edf\u3002<\/p>\n<h4>5.1 \u667a\u80fd\u5bb6\u5c45\u5b89\u5168\u901a\u4fe1\u65b9\u6848<\/h4>\n<p>\u9700\u6c42&#xff1a;\u652f\u630110\u4e07\u7ea7\u8bbe\u5907\u63a5\u5165&#xff0c;\u4fdd\u969c\u63a7\u5236\u6307\u4ee4\u5b89\u5168&#xff0c;\u907f\u514d\u8fc7\u671f\u6307\u4ee4\u6267\u884c&#xff0c;\u5747\u8861\u5904\u7406\u544a\u8b66\u6d88\u606f\u3002<\/p>\n<p>\u7ec4\u5408\u65b9\u6848&#xff1a;<\/p>\n<li>\u539f\u56e0\u7801&#043;\u5c5e\u6027&#xff1a;\u8bbe\u5907\u8fde\u63a5\u5931\u8d25\u65f6\u8fd4\u56de\u5177\u4f53\u539f\u56e0&#xff08;\u59820x86\u8bc1\u4e66\u8fc7\u671f&#xff09;&#xff0c;\u5e76\u901a\u8fc7UserProperty\u9644\u52a0\u8bc1\u4e66\u66f4\u65b0\u94fe\u63a5&#xff1b;<\/li>\n<li>\u5171\u4eab\u8ba2\u9605&#xff1a;\u544a\u8b66\u6d88\u606f&#xff08;alarm\/&#043;\/device\/#&#xff09;\u901a\u8fc7$share\/alarm_group\u5206\u53d1\u7ed9\u591a\u4e2a\u5904\u7406\u8282\u70b9&#xff0c;\u907f\u514d\u5355\u70b9\u74f6\u9888&#xff1b;<\/li>\n<li>\u6d88\u606f\u8fc7\u671f&#xff1a;\u63a7\u5236\u6307\u4ee4&#xff08;\u5982\u201c\u5f00\u706f\u201d&#xff09;\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f430\u79d2&#xff0c;\u907f\u514d\u8bbe\u5907\u79bb\u7ebf\u540e\u91cd\u542f\u6267\u884c\u65e7\u6307\u4ee4&#xff1b;<\/li>\n<li>\u6d41\u91cf\u63a7\u5236&#xff1a;\u8bbe\u5907\u58f0\u660eReceiveMaximum: 16\u3001MaximumPacketSize: 131072&#xff08;128KB&#xff09;&#xff0c;\u670d\u52a1\u7aef\u9650\u5236\u5355\u8bbe\u5907\u6bcf\u79d2\u6700\u591a5\u6761\u6d88\u606f\u3002<\/li>\n<p><span class=\"token comment\"># \u8bbe\u5907\u8fde\u63a5\u914d\u7f6e<\/span><br \/>\nclient <span class=\"token operator\">&#061;<\/span> mqtt<span class=\"token punctuation\">.<\/span>Client<span class=\"token punctuation\">(<\/span>protocol<span class=\"token operator\">&#061;<\/span>mqtt<span class=\"token punctuation\">.<\/span>MQTTv5<span class=\"token punctuation\">)<\/span><br \/>\nclient<span class=\"token punctuation\">.<\/span>tls_set<span class=\"token punctuation\">(<\/span>certfile<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;device_cert.pem&#034;<\/span><span class=\"token punctuation\">,<\/span> keyfile<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;device_key.pem&#034;<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u8bc1\u4e66\u8ba4\u8bc1<\/span><br \/>\nclient<span class=\"token punctuation\">.<\/span>connect<span class=\"token punctuation\">(<\/span><br \/>\n    host<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;broker&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    properties<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token string\">&#034;SessionExpiryInterval&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">86400<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\"># \u4f1a\u8bdd\u4fdd\u75591\u5929<\/span><br \/>\n        <span class=\"token string\">&#034;ReceiveMaximum&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">16<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token string\">&#034;MaximumPacketSize&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">131072<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u8ba2\u9605\u63a7\u5236\u6307\u4ee4&#xff08;\u5e26\u8fc7\u671f\u68c0\u67e5&#xff09;<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">on_message<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">,<\/span> userdata<span class=\"token punctuation\">,<\/span> msg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> msg<span class=\"token punctuation\">.<\/span>properties<span class=\"token punctuation\">.<\/span>get<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;MessageExpiryInterval&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        log<span class=\"token punctuation\">.<\/span>warning<span class=\"token punctuation\">(<\/span><span class=\"token string-interpolation\"><span class=\"token string\">f&#034;Expired command ignored: <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>msg<span class=\"token punctuation\">.<\/span>payload<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><br \/>\n    execute_command<span class=\"token punctuation\">(<\/span>msg<span class=\"token punctuation\">.<\/span>payload<span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u6267\u884c\u6307\u4ee4<\/span><\/p>\n<p>client<span class=\"token punctuation\">.<\/span>subscribe<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;cmd\/device\/12345&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u53d1\u5e03\u544a\u8b66\u6d88\u606f&#xff08;\u5171\u4eab\u8ba2\u9605&#043;\u8fc7\u671f\u65f6\u95f4&#xff09;<\/span><br \/>\nclient<span class=\"token punctuation\">.<\/span>publish<span class=\"token punctuation\">(<\/span><br \/>\n    topic<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;alarm\/device\/12345&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    payload<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#039;{&#034;type&#034;: &#034;fire&#034;, &#034;level&#034;: &#034;high&#034;}&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    qos<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    properties<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token string\">&#034;MessageExpiryInterval&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">60<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\"># \u544a\u8b661\u5206\u949f\u5185\u6709\u6548<\/span><br \/>\n        <span class=\"token string\">&#034;UserProperty&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;device_model&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;smart_switch_v2&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<h4>5.2 \u4ebf\u7ea7\u8fde\u63a5\u8f66\u8054\u7f51\u67b6\u6784<\/h4>\n<p>\u9700\u6c42&#xff1a;\u652f\u6301200\u4e07\u8f66\u8f86\u5728\u7ebf&#xff0c;\u6bcf\u79d2\u5904\u7406100\u4e07\u6761\u6d88\u606f&#xff0c;\u786e\u4fdd\u63a7\u5236\u6307\u4ee4\u5b9e\u65f6\u6027\u4e0e\u53ef\u9760\u6027\u3002<\/p>\n<p>\u67b6\u6784\u8bbe\u8ba1&#xff1a;<\/p>\n<p>#mermaid-svg-Tg68juqT4roNY3cv {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-Tg68juqT4roNY3cv .error-icon{fill:#552222;}#mermaid-svg-Tg68juqT4roNY3cv .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-Tg68juqT4roNY3cv .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-Tg68juqT4roNY3cv .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-Tg68juqT4roNY3cv .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-Tg68juqT4roNY3cv .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-Tg68juqT4roNY3cv .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-Tg68juqT4roNY3cv .marker{fill:#333333;stroke:#333333;}#mermaid-svg-Tg68juqT4roNY3cv .marker.cross{stroke:#333333;}#mermaid-svg-Tg68juqT4roNY3cv svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-Tg68juqT4roNY3cv .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-Tg68juqT4roNY3cv .cluster-label text{fill:#333;}#mermaid-svg-Tg68juqT4roNY3cv .cluster-label span{color:#333;}#mermaid-svg-Tg68juqT4roNY3cv .label text,#mermaid-svg-Tg68juqT4roNY3cv span{fill:#333;color:#333;}#mermaid-svg-Tg68juqT4roNY3cv .node rect,#mermaid-svg-Tg68juqT4roNY3cv .node circle,#mermaid-svg-Tg68juqT4roNY3cv .node ellipse,#mermaid-svg-Tg68juqT4roNY3cv .node polygon,#mermaid-svg-Tg68juqT4roNY3cv .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-Tg68juqT4roNY3cv .node .label{text-align:center;}#mermaid-svg-Tg68juqT4roNY3cv .node.clickable{cursor:pointer;}#mermaid-svg-Tg68juqT4roNY3cv .arrowheadPath{fill:#333333;}#mermaid-svg-Tg68juqT4roNY3cv .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-Tg68juqT4roNY3cv .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-Tg68juqT4roNY3cv .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-Tg68juqT4roNY3cv .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-Tg68juqT4roNY3cv .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-Tg68juqT4roNY3cv .cluster text{fill:#333;}#mermaid-svg-Tg68juqT4roNY3cv .cluster span{color:#333;}#mermaid-svg-Tg68juqT4roNY3cv 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-Tg68juqT4roNY3cv :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<span id=\"L-L-A-B\" class=\"edgeLabel L-LS-A&#039; L-LE-B\">MQTT 5.0<\/span><span id=\"L-L-B-C\" class=\"edgeLabel L-LS-B&#039; L-LE-C\">\u5171\u4eab\u8ba2\u9605\u5206\u6d41<\/span><span id=\"L-L-C-D\" class=\"edgeLabel L-LS-C&#039; L-LE-D\"><\/span><span id=\"L-L-C-E\" class=\"edgeLabel L-LS-C&#039; L-LE-E\"><\/span><span id=\"L-L-C-F\" class=\"edgeLabel L-LS-C&#039; L-LE-F\"><\/span>\u8f66\u8f86\u5ba2\u6237\u7aef\u8fb9\u7f18\u63a5\u5165\u5c42\u6838\u5fc3\u96c6\u7fa4Redis \u5b9e\u65f6\u7f13\u5b58TimescaleDB \u65f6\u5e8f\u5b58\u50a8\u6307\u4ee4\u5904\u7406\u670d\u52a1<\/p>\n<p>\u5173\u952e\u7279\u6027\u5e94\u7528&#xff1a;<\/p>\n<ul>\n<li>\u8fb9\u7f18\u63a5\u5165\u5c42&#xff1a;\u9a8c\u8bc1\u8f66\u8f86\u8bc1\u4e66&#xff0c;\u8fd4\u56de\u8fde\u63a5\u539f\u56e0\u7801&#xff08;\u59820x87\u62d2\u7edd\u9ed1\u540d\u5355\u8f66\u8f86&#xff09;&#xff1b;<\/li>\n<li>\u6838\u5fc3\u96c6\u7fa4&#xff1a;\u901a\u8fc7$share\/region_*\/cmd\/vehicle\/#\u6309\u5730\u57df\u5206\u6d41\u6307\u4ee4&#xff0c;\u6bcf\u7ec410\u4e2a\u5904\u7406\u8282\u70b9&#xff1b;<\/li>\n<li>\u6d88\u606f\u5904\u7406&#xff1a;\u63a7\u5236\u6307\u4ee4\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f45\u79d2&#xff0c;\u6d41\u91cf\u63a7\u5236\u53c2\u6570ReceiveMaximum: 64\u3001MaximumPacketSize: 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