{"id":10765,"date":"2022-09-09T08:29:21","date_gmt":"2022-09-09T00:29:21","guid":{"rendered":"https:\/\/www.modbus.cn\/?p=10765"},"modified":"2026-07-01T08:51:11","modified_gmt":"2026-07-01T00:51:11","slug":"4g-dtu-chuan-kou-fu-wu-qi-deng-wu-lian-wang-chuan-shu-mo-kuai-zhong-de-xin-tiao-bao-zhu","status":"publish","type":"post","link":"https:\/\/www.modbus.cn\/en\/10765.html","title":{"rendered":"4G DTU\u3001\u4e32\u53e3\u670d\u52a1\u5668\u7b49\u7269\u8054\u7f51\u4f20\u8f93\u6a21\u5757\u4e2d\u7684\u5fc3\u8df3\u5305\u3001\u6ce8\u518c\u5305\u8bf4\u660e"},"content":{"rendered":"<p class=\"wp-block-paragraph\">\u6765\u6e90\uff1aModbus\u4e2d\u6587\u7f51\uff08modbus.cn\uff09 \u2014\u2014 \u56fd\u5185\u9886\u5148\u7684Modbus\u901a\u4fe1\u534f\u8bae\u6280\u672f\u793e\u533a<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u672c\u6587\uff1a\u7269\u8054\u7f51\u4f20\u8f93\u6a21\u5757\u7684\u5fc3\u8df3\u5305\u4e0e\u6ce8\u518c\u5305\uff1a\u673a\u5236\u3001\u8bbe\u8ba1\u4e0e\u6392\u969c \u00b7 \u4f5c\u8005\uff1amodbus\u6280\u672f\u56e2\u961f \u00b7 \u53d1\u5e03\u4e8e 2026-07-01<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u6458\u8981\uff1a4G DTU\u3001\u4e32\u53e3\u670d\u52a1\u5668\u3001\u8fb9\u7f18\u7f51\u5173\u7b49\u7269\u8054\u7f51\u4f20\u8f93\u6a21\u5757\u4e2d\uff0c\u5fc3\u8df3\u5305\u548c\u6ce8\u518c\u5305\u662f\u7ef4\u6301\u8fde\u63a5\u7a33\u5b9a\u548c\u8bbe\u5907\u8eab\u4efd\u8bc6\u522b\u7684\u6838\u5fc3\u673a\u5236\u3002\u672c\u6587\u4ece TCP KeepAlive\u3001MQTT Keep Alive\u3001\u5e94\u7528\u5c42\u81ea\u5b9a\u4e49\u5fc3\u8df3\u4e09\u4e2a\u5c42\u9762\u7cfb\u7edf\u8bb2\u89e3\u5fc3\u8df3\u673a\u5236\uff1b\u4ece DTU \u6ce8\u518c\u5305\u5230\u4e91\u5e73\u53f0\u8bbe\u5907\u8eab\u4efd\u8ba4\u8bc1\u68b3\u7406\u6ce8\u518c\u673a\u5236\uff0c\u9644\u53c2\u6570\u8ba1\u7b97\u516c\u5f0f\u3001\u4ee3\u7801\u793a\u4f8b\u548c\u6392\u969c\u6b65\u9aa4\u3002\u5173\u952e\u8bcd\uff1a\u5fc3\u8df3\u5305\u3001\u6ce8\u518c\u5305\u30014G DTU\u3001Keep Alive\u3001MQTT \u5fc3\u8df3\u3001TCP \u4fdd\u6d3b\u3001\u8bbe\u5907\u6ce8\u518c\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u5757 4G DTU \u63d2\u4e0a SIM \u5361\uff0c\u914d\u597d\u4e32\u53e3\u53c2\u6570\uff0c\u8fde\u4e0a\u670d\u52a1\u5668\u2014\u2014\u6570\u636e\u901a\u4e86\uff0c\u4f60\u89c9\u5f97\u641e\u5b9a\u4e86\u3002\u8fc7\u4e86\u4e00\u665a\u4e0a\uff0c\u7b2c\u4e8c\u5929\u6765\u53d1\u73b0\u8bbe\u5907\u79bb\u7ebf\u4e86\uff0c\u4f46\u4fe1\u53f7\u706f\u8fd8\u4eae\u7740\u3002\u91cd\u542f\u4e00\u4e0b\u597d\u4e86\u3002\u518d\u8fc7\u51e0\u5929\u53c8\u79bb\u7ebf\u4e86\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u5c31\u662f\u957f\u8fde\u63a5\u4fdd\u6d3b\u7684\u5178\u578b\u95ee\u9898\u3002\u5728\u7269\u8054\u7f51\u573a\u666f\u91cc\uff0c\u8bbe\u5907\u5206\u5e03\u5728\u5168\u56fd\u5404\u5730\uff0c\u6709\u4e9b\u5728\u504f\u8fdc\u5c71\u533a\uff0c\u6709\u4e9b\u5728\u5730\u4e0b\u5ba4\u3002\u901a\u4fe1\u94fe\u8def\u4ece\u8bbe\u5907\u7684\u4e32\u53e3\u51fa\u53d1\uff0c\u7ecf\u8fc7 DTU \u7684 4G \u6a21\u7ec4\uff0c\u7a7f\u8d8a\u8fd0\u8425\u5546\u7684 NAT \u7f51\u5173\uff0c\u518d\u901a\u8fc7\u516c\u7f51\u5230\u8fbe\u4f60\u7684\u4e91\u670d\u52a1\u5668\u3002\u8fd9\u6761\u94fe\u8def\u4e0a\u6bcf\u4e00\u4e2a\u73af\u8282\u90fd\u53ef\u80fd\u628a\u4f60\u7684\u8fde\u63a5\u6740\u6389\uff0c\u4f46\u4e0d\u4f1a\u901a\u77e5\u4f60\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u7bc7\u6587\u7ae0\u628a\u5fc3\u8df3\u5305\u548c\u6ce8\u518c\u5305\u4ece\u539f\u7406\u5230\u5b9e\u6218\u5168\u90e8\u8bb2\u6e05\u695a\u2014\u2014\u4e0d\u53ea\u662f\u6982\u5ff5\uff0c\u66f4\u7ed9\u51fa\u4f60\u53ef\u4ee5\u5728\u9879\u76ee\u4e2d\u76f4\u63a5\u7528\u7684\u53c2\u6570\u3001\u4ee3\u7801\u548c\u6392\u969c\u65b9\u6cd5\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u4e3a\u4ec0\u4e48\u957f\u8fde\u63a5\u4f1a\u65ad<\/h2>\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8bb2\u5fc3\u8df3\u4e4b\u524d\uff0c\u5148\u641e\u6e05\u695a\u957f\u8fde\u63a5\u662f\u600e\u4e48\u65ad\u7684\u2014\u2014\u56e0\u4e3a\u4e0d\u540c\u539f\u56e0\u5bf9\u5e94\u4e0d\u540c\u7684\u4fdd\u6d3b\u7b56\u7565\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8fd0\u8425\u5546 NAT \u8d85\u65f6<\/strong>\u30024G DTU \u7528\u7684\u662f\u79fb\u52a8\u7f51\u7edc\u79c1\u6709 IP\uff0810.x.x.x \/ 100.x.x.x\uff09\uff0c\u7ecf\u8fc7\u8fd0\u8425\u5546\u7684 NAT \u7f51\u5173\u624d\u80fd\u8bbf\u95ee\u516c\u7f51\u3002NAT \u7f51\u5173\u4e3a\u4e86\u8282\u7701\u8d44\u6e90\uff0c\u4f1a\u7ed9\u7a7a\u95f2\u8fde\u63a5\u8bbe\u4e00\u4e2a\u8d85\u65f6\u65f6\u95f4\u3002\u56fd\u5185\u4e09\u5927\u8fd0\u8425\u5546\u7684\u5178\u578b\u503c\uff1a<\/p>\n\n\n<ul class=\"wp-block-list\"><li>\u4e2d\u56fd\u79fb\u52a8\uff1a5 \u5206\u949f<\/li><li>\u4e2d\u56fd\u8054\u901a\uff1a\u5927\u6982 2-3 \u5206\u949f<\/li><li>\u4e2d\u56fd\u7535\u4fe1\uff1a\u5927\u6982 3-5 \u5206\u949f<\/li><\/ul>\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u540c\u5730\u533a\u3001\u4e0d\u540c\u5957\u9910\u5361\u7684 NAT \u8d85\u65f6\u65f6\u95f4\u4e0d\u5b8c\u5168\u4e00\u6837\uff0c\u4f46\u57fa\u672c\u90fd\u5728 2-5 \u5206\u949f\u4e4b\u95f4\u3002\u8d85\u8fc7\u8fd9\u4e2a\u65f6\u95f4\u6ca1\u6709\u6570\u636e\u5305\u7ecf\u8fc7\uff0cNAT \u7f51\u5173\u4e0a\u8fd9\u6761\u6620\u5c04\u8bb0\u5f55\u5c31\u88ab\u6e05\u9664\u4e86\u3002\u4e4b\u540e\u670d\u52a1\u5668\u60f3\u5411 DTU \u53d1\u5305\u65f6\uff0cNAT \u7f51\u5173\u5df2\u7ecf\u4e0d\u8ba4\u8bc6\u8fd9\u4e2a\u5305\u4e86\uff0c\u76f4\u63a5\u4e22\u5f03\u2014\u2014\u8bbe\u5907\u770b\u8d77\u6765\u8fd8\u662f\u5728\u7ebf\uff084G \u9644\u7740\u6b63\u5e38\uff09\uff0c\u4f46\u6570\u636e\u901a\u9053\u5df2\u7ecf\u6b7b\u4e86\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u9632\u706b\u5899 \/ \u4e2d\u95f4\u8bbe\u5907<\/strong>\u3002\u4f01\u4e1a\u7f51\u7edc\u7684\u51fa\u53e3\u9632\u706b\u5899\u901a\u5e38\u4e5f\u4f1a\u5bf9\u7a7a\u95f2 TCP \u8fde\u63a5\u505a\u6e05\u7406\u3002\u4e00\u53f0\u5de5\u63a7\u673a\u901a\u8fc7 WiFi \u63a5\u5165\u4e86\u4f01\u4e1a\u5185\u7f51\uff0c\u548c\u4e91\u7aef\u670d\u52a1\u5668\u4fdd\u6301\u4e00\u4e2a Modbus TCP \u8fde\u63a5\u3002\u5982\u679c\u534a\u5c0f\u65f6\u6ca1\u901a\u4fe1\uff0c\u4e2d\u95f4\u90a3\u53f0\u6df1\u4fe1\u670d \/ \u534e\u4e3a\u9632\u706b\u5899\u4f1a\u628a\u8fd9\u6761\u8fde\u63a5\u7684\u72b6\u6001\u6807\u8bb0\u4e3a\u8fc7\u671f\u5e76\u91ca\u653e\u3002\u670d\u52a1\u5668\u4ee5\u4e3a\u8bbe\u5907\u8fd8\u8fde\u7740\uff0c\u8bbe\u5907\u4ee5\u4e3a\u670d\u52a1\u5668\u8fd8\u5728\u2014\u2014\u8fd9\u5c31\u662f\u300c\u8fde\u63a5\u5047\u6b7b\u300d\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8bbe\u5907\u5f02\u5e38\u6389\u7ebf<\/strong>\u3002\u73b0\u573a\u8bbe\u5907\u65ad\u7535\u30014G \u4fe1\u53f7\u4e22\u5931\u3001\u4ea4\u6362\u673a\u91cd\u542f\u2014\u2014\u8fd9\u4e9b\u60c5\u51b5\u4e0b TCP \u8fde\u63a5\u7684\u5bf9\u7aef\u4e0d\u4f1a\u6536\u5230 FIN \u5305\u3002\u56db\u5c42\u6ca1\u6709\u65ad\u5f00\u4fe1\u53f7\uff0c\u5e94\u7528\u5c42\u5c31\u65e0\u4ece\u611f\u77e5\u3002\u5982\u679c\u4e0d\u9760\u5fc3\u8df3\u68c0\u6d4b\uff0c\u670d\u52a1\u5668\u4f1a\u4e00\u76f4\u8ba4\u4e3a\u8bbe\u5907\u5728\u7ebf\uff0c\u8c03\u5ea6\u4efb\u52a1\u7167\u5e38\u4e0b\u53d1\uff0c\u5168\u90e8\u8d85\u65f6\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>TCP \u534a\u5f00\u8fde\u63a5<\/strong>\u3002TCP \u8fde\u63a5\u7684\u4e00\u7aef\u5df2\u7ecf\u5173\u95ed\uff08\u6bd4\u5982\u670d\u52a1\u5668\u91cd\u542f\u4e86\uff09\uff0c\u53e6\u4e00\u7aef\u4e0d\u77e5\u9053\uff0c\u8fd8\u5728 keep-alive \u72b6\u6001\u3002\u8fd9\u662f\u6807\u51c6\u7684\u300c\u534a\u5f00\u8fde\u63a5\u300d\u573a\u666f\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u4e09\u5c42\u4fdd\u6d3b\u673a\u5236\uff1aTCP KeepAlive\u3001MQTT Keep Alive\u3001\u5e94\u7528\u5c42\u5fc3\u8df3<\/h2>\n\n\n<p class=\"wp-block-paragraph\">\u4fdd\u6d3b\u6709\u4e09\u79cd\u5c42\u6b21\uff0c\u5bf9\u5e94\u4e0d\u540c\u7684\u573a\u666f\u548c\u7c92\u5ea6\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">2.1 TCP \u534f\u8bae\u5c42\u7684 KeepAlive \u2014\u2014 \u6700\u5e95\u5c42\uff0c\u6700\u4e0d\u7075\u6d3b<\/h3>\n\n\n<p class=\"wp-block-paragraph\">TCP \u534f\u8bae\u6808\u81ea\u5e26 KeepAlive \u673a\u5236\u3002\u5f00\u542f\u540e\uff0c\u5982\u679c\u8fde\u63a5\u5728\u6307\u5b9a\u65f6\u95f4\u5185\u6ca1\u6709\u6570\u636e\u4f20\u8f93\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u4f1a\u81ea\u52a8\u53d1\u9001\u63a2\u6d4b\u5305\uff08\u7a7a ACK\uff09\u53bb\u5bf9\u7aef\uff0c\u7b49\u5bf9\u7aef\u56de\u590d\u3002\u5bf9\u7aef\u5982\u679c\u8fd8\u6d3b\u7740\uff0c\u56de\u590d\u4e00\u4e2a ACK\uff1b\u5982\u679c\u6b7b\u4e86\uff0c\u591a\u6b21\u63a2\u6d4b\u65e0\u679c\u540e\u5173\u95ed\u8fde\u63a5\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">Linux \u5185\u6838\u7684\u4e09\u4e2a\u5173\u952e\u53c2\u6570\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>net.ipv4.tcp_keepalive_time = 7200    # \u9996\u6b21\u63a2\u6d4b\u524d\u7684\u7a7a\u95f2\u65f6\u95f4\uff08\u79d2\uff09\uff0c\u9ed8\u8ba4 2 \u5c0f\u65f6\nnet.ipv4.tcp_keepalive_intvl = 75     # \u63a2\u6d4b\u95f4\u9694\uff08\u79d2\uff09\uff0c\u9ed8\u8ba4 75 \u79d2\nnet.ipv4.tcp_keepalive_probes = 9     # \u63a2\u6d4b\u6b21\u6570\uff0c\u9ed8\u8ba4 9 \u6b21<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u4e5f\u5c31\u662f\u8bf4\uff0c\u9ed8\u8ba4\u914d\u7f6e\u4e0b\uff0c\u4e00\u6761 TCP \u8fde\u63a5\u8981\u65ad\u6389 2 \u5c0f\u65f6 11 \u5206 15 \u79d2\uff087200 + 75 \u00d7 9\uff09\u4e4b\u540e\uff0c\u64cd\u4f5c\u7cfb\u7edf\u624d\u4f1a\u901a\u77e5\u5e94\u7528\u5c42\u300c\u8fd9\u6761\u8fde\u63a5\u6b7b\u4e86\u300d\u3002\u8fd9\u4e2a\u65f6\u95f4\u5bf9\u7269\u8054\u7f51\u573a\u666f\u5b8c\u5168\u4e0d\u80fd\u7528\u2014\u2014\u7b49\u4f60\u53d1\u73b0\u8bbe\u5907\u79bb\u7ebf\u4e86\uff0c\u8bbe\u5907\u7684\u7535\u6c60\u90fd\u6362\u4e86\u4e24\u8f6e\u4e86\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u5728\u4ee3\u7801\u4e2d\u4e3a\u5355\u4e2a socket \u8bbe\u7f6e\u66f4\u77ed\u7684\u53c2\u6570\uff08Linux \u2265 2.6.37 \u652f\u6301\uff09\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>import socket\n\nsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\nsock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)\n# \u4ee5\u4e0b\u4e09\u4e2a\u53c2\u6570\u9700\u8981 Linux 2.6.37+ \u4e14 socket \u4e3a IPPROTO_TCP\nsock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 60)    # 60 \u79d2\u7a7a\u95f2\u540e\u5f00\u59cb\u63a2\u6d4b\nsock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 10)   # \u6bcf 10 \u79d2\u63a2\u6d4b\u4e00\u6b21\nsock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 3)      # 3 \u6b21\u65e0\u54cd\u5e94\u5224\u5b9a\u65ad\u5f00<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\u914d\u7f6e\u540e\uff0c\u8fde\u63a5\u65ad\u5f00\u7684\u53d1\u73b0\u65f6\u95f4 = 60 + 10 \u00d7 3 = 90 \u79d2\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4f46 TCP KeepAlive \u6709\u4e24\u4e2a\u81f4\u547d\u7f3a\u9677<\/strong>\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u7b2c\u4e00\uff0c\u5b83\u53ea\u80fd\u68c0\u6d4b\u7aef\u5230\u7aef\u7684 TCP \u8fde\u63a5\u662f\u5426\u5b58\u6d3b\uff0c\u65e0\u6cd5\u68c0\u6d4b\u7aef\u5230\u7aef\u4e4b\u95f4\u7684\u4e2d\u95f4\u8bbe\u5907\uff08NAT \u7f51\u5173\u3001\u9632\u706b\u5899\uff09\u662f\u5426\u6e05\u7406\u4e86\u8fde\u63a5\u3002\u63a2\u6d4b\u5305\u53ea\u5728\u4e24\u4e2a\u7aef\u70b9\u7684 TCP \u6808\u4e4b\u95f4\u6d41\u52a8\uff0c\u7ecf\u8fc7 NAT \u7f51\u5173\u65f6\u53ef\u80fd\u4e0d\u4f1a\u5237\u65b0 NAT \u6620\u5c04\u6761\u76ee\u2014\u2014\u4e5f\u5c31\u662f\u8bf4\uff0cTCP \u5c42\u8ba4\u4e3a\u8fde\u63a5\u6b63\u5e38\uff0c\u4f46 NAT \u5df2\u7ecf\u628a\u901a\u9053\u5173\u4e86\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u7b2c\u4e8c\uff0c2 \u5c0f\u65f6\u9ed8\u8ba4\u503c\u592a\u957f\uff0c\u6539\u4e86\u53c2\u6570\u4e5f\u53ea\u5bf9\u5f53\u524d socket \u751f\u6548\uff0c\u6362\u53f0\u673a\u5668\u53c8\u56de\u5230\u9ed8\u8ba4\u914d\u7f6e\u3002\u800c\u4e14\u53c2\u6570\u4fee\u6539\u9700\u8981 root \u6743\u9650\uff0c\u5d4c\u5165\u5f0f\u8bbe\u5907\uff08DTU\u3001\u4e32\u53e3\u670d\u52a1\u5668\uff09\u7684\u5185\u6838\u53ef\u80fd\u4e0d\u652f\u6301\u52a8\u6001\u4fee\u6539\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6240\u4ee5 TCP KeepAlive \u5728\u7269\u8054\u7f51\u573a\u666f\u91cc\u53ea\u80fd\u505a\u8f85\u52a9\u624b\u6bb5\uff0c\u4e0d\u80fd\u66ff\u4ee3\u5e94\u7528\u5c42\u5fc3\u8df3\u3002<\/strong><\/p>\n\n\n<h3 class=\"wp-block-heading\">2.2 MQTT \u534f\u8bae\u7684 Keep Alive \u2014\u2014 \u6807\u51c6\u5316\u7684\u5e94\u7528\u5c42\u4fdd\u6d3b<\/h3>\n\n\n<p class=\"wp-block-paragraph\">MQTT \u534f\u8bae\u5728 CONNECT \u62a5\u6587\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2a 16 \u4f4d\u7684 Keep Alive \u5b57\u6bb5\uff0c\u5355\u4f4d\u662f\u79d2\u3002\u8fd9\u4e2a\u673a\u5236\u6bd4 TCP KeepAlive \u66f4\u8d34\u8fd1\u5e94\u7528\u5c42\u9700\u6c42\uff1a<\/p>\n\n\n<ul class=\"wp-block-list\"><li>\u5ba2\u6237\u7aef\u5728 Keep Alive \u65f6\u95f4\u5185\u5fc5\u987b\u81f3\u5c11\u53d1\u9001\u4e00\u4e2a\u63a7\u5236\u62a5\u6587\uff08\u53ef\u4ee5\u662f PUBLISH\u3001SUBSCRIBE\u3001PINGREQ \u7b49\u4efb\u4f55\u4e00\u79cd\uff09\u3002<\/li><li>\u5982\u679c\u670d\u52a1\u7aef\uff08Broker\uff09\u5728 1.5 \u00d7 Keep Alive \u65f6\u95f4\u5185\u6ca1\u6709\u6536\u5230\u6765\u81ea\u5ba2\u6237\u7aef\u7684\u4efb\u4f55\u6570\u636e\u5305\uff0c\u5219\u8ba4\u4e3a\u5ba2\u6237\u7aef\u5df2\u65ad\u5f00\uff0c\u5173\u95ed TCP \u8fde\u63a5\u5e76\u6267\u884c\u9057\u5631\u6d88\u606f\uff08Last Will\uff09\u3002<\/li><li>\u540c\u7406\uff0c\u5982\u679c\u5ba2\u6237\u7aef\u5728 Keep Alive \u65f6\u95f4\u5185\u6ca1\u6709\u6536\u5230\u6765\u81ea Broker \u7684\u4efb\u4f55\u6570\u636e\u5305\uff0c\u4e5f\u5e94\u8be5\u4e3b\u52a8\u91cd\u8fde\u3002<\/li><\/ul>\n\n\n<p class=\"wp-block-paragraph\">MQTT 5.0 \u66f4\u8fdb\u4e00\u6b65\uff0c\u5141\u8bb8 Broker \u5728 CONNACK \u62a5\u6587\u4e2d\u8fd4\u56de Server Keep Alive \u503c\u2014\u2014\u5982\u679c Broker \u4e0d\u63a5\u53d7\u5ba2\u6237\u7aef\u5efa\u8bae\u7684 Keep Alive\uff0c\u5b83\u53ef\u4ee5\u7528\u81ea\u5df1\u7684\u503c\u8986\u76d6\uff0c\u5ba2\u6237\u7aef\u5fc5\u987b\u9075\u5b88 Broker \u8fd4\u56de\u7684\u503c\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5173\u952e\u6570\u503c\u9009\u62e9<\/strong>\uff1aMQTT \u7684 Keep Alive \u4e0d\u80fd\u8bbe\u592a\u5927\u4e5f\u4e0d\u80fd\u592a\u5c0f\u3002\u592a\u5927\u4e86\uff0c\u8bbe\u5907\u79bb\u7ebf\u5f88\u4e45 Broker \u624d\u53d1\u73b0\uff1b\u592a\u5c0f\u4e86\uff0c\u5fc3\u8df3\u5305\u9891\u7e41\u6d88\u8017 SIM \u5361\u6d41\u91cf\u3002\u5b9e\u9645\u9879\u76ee\u4e2d\uff0cMQTT \u7684 Keep Alive \u4e00\u822c\u8bbe\u5728 60-120 \u79d2\u4e4b\u95f4\u3002\u5982\u679c\u8bbe\u5907\u662f\u7535\u6c60\u4f9b\u7535\uff08NB-IoT \u573a\u666f\uff09\uff0c\u53ef\u4ee5\u653e\u5bbd\u5230 300-600 \u79d2\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u548c TCP KeepAlive \u7684\u533a\u522b<\/strong>\uff1aMQTT \u7684 Keep Alive \u662f\u5e94\u7528\u5c42\u534f\u8bae\u884c\u4e3a\uff0cPINGREQ \u62a5\u6587\u5c01\u88c5\u5728 TCP \u5305\u91cc\u53d1\u9001\u3002NAT \u7f51\u5173\u770b\u5230\u6709 TCP \u5305\u7ecf\u8fc7\uff0c\u4f1a\u5237\u65b0\u6620\u5c04\u6761\u76ee\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48 MQTT \u7684 Keep Alive \u80fd\u89e3\u51b3 NAT \u8d85\u65f6\u95ee\u9898\uff0c\u800c TCP KeepAlive \u4e0d\u4e00\u5b9a\u80fd\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">2.3 \u5e94\u7528\u5c42\u81ea\u5b9a\u4e49\u5fc3\u8df3 \u2014\u2014 \u6700\u7075\u6d3b\uff0c\u4e5f\u6700\u9700\u8981\u8bbe\u8ba1<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4f60\u7684\u8bbe\u5907\u4e0d\u7528 MQTT\uff0c\u8d70\u7684\u662f\u88f8 TCP\/UDP \u900f\u4f20\uff08Modbus TCP\u3001\u81ea\u5b9a\u4e49\u4e8c\u8fdb\u5236\u534f\u8bae\u7b49\uff09\uff0c\u4f60\u5c31\u9700\u8981\u81ea\u5df1\u8bbe\u8ba1\u5e94\u7528\u5c42\u5fc3\u8df3\u3002\u8fd9\u5c31\u662f 4G DTU \u548c\u4e32\u53e3\u670d\u52a1\u5668\u91cc\u6700\u5e38\u89c1\u7684\u5fc3\u8df3\u5305\u6982\u5ff5\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8bbe\u8ba1\u539f\u5219<\/strong>\uff1a<\/p>\n\n\n<ol class=\"wp-block-list\"><li><strong>\u5fc3\u8df3\u5305\u8981\u5c3d\u91cf\u5c0f\u3002<\/strong> \u6d41\u91cf\u662f\u94b1\u3002\u6700\u7b80\u5fc3\u8df3\u5305\u53ef\u4ee5\u662f\u4e00\u4e2a\u5b57\u8282\u2014\u2014\u6bd4\u5982 <code>0x48<\/code>\uff08ASCII \u7684 &#8216;H&#8217;\uff09\uff0c\u6216\u8005\u56fa\u5b9a\u5b57\u7b26\u4e32 &#8220;Q&#8221;\u3002<\/li><li><strong>\u5fc3\u8df3\u95f4\u9694\u8981\u5c0f\u4e8e NAT \u8d85\u65f6\u65f6\u95f4\u3002<\/strong> \u56fd\u5185\u8fd0\u8425\u5546 NAT \u8d85\u65f6\u6700\u77ed\u7684\u662f 2 \u5206\u949f\uff0c\u6240\u4ee5\u5fc3\u8df3\u95f4\u9694\u4e00\u822c\u8bbe 60 \u79d2\u6216\u66f4\u77ed\u3002\u4fdd\u5b88\u5efa\u8bae 30-60 \u79d2\u3002<\/li><li><strong>\u670d\u52a1\u5668\u5e94\u8be5\u56de\u590d\u5fc3\u8df3\u3002<\/strong> \u5355\u5411\u5fc3\u8df3\u53ea\u80fd\u8ba9\u670d\u52a1\u5668\u77e5\u9053\u8bbe\u5907\u6d3b\u7740\uff0c\u4f46\u8bbe\u5907\u4e0d\u77e5\u9053\u670d\u52a1\u5668\u662f\u5426\u6d3b\u7740\u3002\u53cc\u5411\u5fc3\u8df3\uff08\u8bbe\u5907\u53d1\uff0c\u670d\u52a1\u5668\u56de\uff09\u8ba9\u4e24\u7aef\u90fd\u80fd\u68c0\u6d4b\u5bf9\u7aef\u72b6\u6001\u3002<\/li><li><strong>\u8fde\u7eed N \u6b21\u5fc3\u8df3\u5931\u8d25\u540e\u89e6\u53d1\u91cd\u8fde\u3002<\/strong> \u4e0d\u662f\u4e22\u4e00\u4e2a\u5fc3\u8df3\u5c31\u65ad\u2014\u2014\u5076\u5c14\u7684\u4e22\u5305\u5728\u7f51\u7edc\u5c42\u9762\u6b63\u5e38\u3002\u901a\u5e38\u8bbe\u4e3a\u8fde\u7eed 3 \u6b21\u5fc3\u8df3\u65e0\u56de\u5e94\u540e\u89e6\u53d1\u91cd\u8fde\u6d41\u7a0b\u3002<\/li><\/ol>\n\n\n<p class=\"wp-block-paragraph\"><strong>AIRIOT \u5e73\u53f0\u7684\u5fc3\u8df3\u793a\u4f8b<\/strong>\uff1a\u8bbe\u5907\u5b9a\u65f6\u53d1\u9001\u5b57\u7b26 &#8220;Q&#8221;\uff0c\u5e73\u53f0\u6536\u5230\u540e\u7acb\u5373\u56de\u590d &#8220;A&#8221;\u3002\u8bbe\u5907\u901a\u8fc7\u662f\u5426\u6536\u5230 &#8220;A&#8221; \u6765\u5224\u65ad\u8fde\u63a5\u662f\u5426\u6b63\u5e38\u2014\u2014\u8fd9\u4e2a\u8bbe\u8ba1\u7b80\u5355\u6709\u6548\uff0c4G DTU \u4e0a\u5b9e\u73b0\u6210\u672c\u6781\u4f4e\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5fc3\u8df3\u95f4\u9694\u7684\u8ba1\u7b97\u516c\u5f0f<\/strong>\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>\u5fc3\u8df3\u95f4\u9694 &lt; NAT\u8d85\u65f6\u65f6\u95f4 \u00d7 \u5b89\u5168\u7cfb\u6570\n\u5b89\u5168\u7cfb\u6570 = 0.6 ~ 0.8<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u8fd0\u8425\u5546 NAT \u8d85\u65f6\u662f 5 \u5206\u949f\uff08300 \u79d2\uff09\uff0c\u53d6\u5b89\u5168\u7cfb\u6570 0.6\uff0c\u5fc3\u8df3\u95f4\u9694 \u2264 180 \u79d2\u3002\u518d\u8003\u8651\u5230\u5076\u5c14\u7684\u7f51\u7edc\u6296\u52a8\uff0c\u5b9e\u9645\u9879\u76ee\u4e2d\u8bbe 60~90 \u79d2\u66f4\u7a33\u59a5\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001TCP KeepAlive vs \u5e94\u7528\u5c42\u5fc3\u8df3\uff1a\u4ec0\u4e48\u65f6\u5019\u7528\u54ea\u4e2a<\/h2>\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u95ee\u9898\u6ca1\u6709\u6807\u51c6\u7b54\u6848\uff0c\u53d6\u51b3\u4e8e\u4f60\u7684\u573a\u666f\u3002<\/p>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u7ef4\u5ea6<\/th><th>TCP KeepAlive<\/th><th>\u5e94\u7528\u5c42\u5fc3\u8df3<\/th><\/tr><\/thead><tbody><tr><td>\u5b9e\u73b0\u6210\u672c<\/td><td>\u4e00\u884c\u4ee3\u7801\u5f00\u542f\uff0c\u96f6\u534f\u8bae\u5f00\u9500<\/td><td>\u9700\u8981\u5b9a\u4e49\u5fc3\u8df3\u5e27\u548c\u8d85\u65f6\u903b\u8f91<\/td><\/tr><tr><td>\u7a7f\u900f NAT<\/td><td>\u4e0d\u4e00\u5b9a\uff0c\u63a2\u6d4b\u5305\u662f\u7a7a ACK<\/td><td>\u4e00\u5b9a\u80fd\uff0c\u5237\u65b0 NAT \u6620\u5c04<\/td><\/tr><tr><td>\u7075\u6d3b\u6027<\/td><td>\u53ea\u80fd\u68c0\u6d4b TCP \u8fde\u901a\u6027<\/td><td>\u53ef\u643a\u5e26\u72b6\u6001\u4fe1\u606f\u3001\u65f6\u95f4\u6233\u3001\u8bbe\u5907\u7535\u91cf\u7b49<\/td><\/tr><tr><td>\u8de8\u534f\u8bae\u901a\u7528<\/td><td>\u4ec5 TCP<\/td><td>TCP \/ UDP \u5747\u53ef<\/td><\/tr><tr><td>\u6d41\u91cf\u5f00\u9500<\/td><td>\u6781\u5c0f\uff08\u7a7a ACK\uff0c40 \u5b57\u8282\u5de6\u53f3\uff09<\/td><td>\u53d6\u51b3\u4e8e\u81ea\u5b9a\u4e49\u534f\u8bae\uff08\u901a\u5e38\u51e0\u5341\u5b57\u8282\uff09<\/td><\/tr><tr><td>\u9ed8\u8ba4\u914d\u7f6e<\/td><td>2 \u5c0f\u65f6\u8d77\uff0c\u4e0d\u53ef\u63a5\u53d7<\/td><td>\u5b8c\u5168\u53ef\u63a7<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5efa\u8bae\u7684\u7ec4\u5408\u7b56\u7565<\/strong>\uff1a\u5728\u751f\u4ea7\u9879\u76ee\u4e2d\uff0c\u540c\u65f6\u5f00\u542f TCP KeepAlive\uff08\u4f5c\u4e3a\u5e95\u5c42\u515c\u5e95\uff09\u548c\u5e94\u7528\u5c42\u5fc3\u8df3\uff08\u4f5c\u4e3a\u4e3b\u529b\u68c0\u6d4b\uff09\u3002TCP KeepAlive \u53c2\u6570\u8bbe\u77ed\u4e00\u70b9\uff0860 \u79d2\u7a7a\u95f2 + 10 \u79d2\u95f4\u9694 + 3 \u6b21\u63a2\u6d4b\uff09\uff0c\u5e94\u7528\u5c42\u5fc3\u8df3\u8bbe 30-60 \u79d2\u3002\u5373\u4f7f\u5e94\u7528\u5c42\u5fc3\u8df3\u56e0\u4e3a bug \u6ca1\u53d1\u51fa\u53bb\uff0cTCP KeepAlive \u5728 90 \u79d2\u540e\u4e5f\u4f1a\u53d1\u73b0\u8fde\u63a5\u65ad\u5f00\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4f60\u7684\u8bbe\u5907\u5fc5\u987b\u8d70 UDP\uff08\u6bd4\u5982\u67d0\u4e9b DTU \u7684\u6ce8\u518c\u6a21\u5f0f\uff09\uff0c\u90a3 TCP KeepAlive \u5b8c\u5168\u6ca1\u7528\u2014\u2014\u53ea\u80fd\u7528\u5e94\u7528\u5c42\u5fc3\u8df3\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u6ce8\u518c\u5305\uff1a\u8ba9\u670d\u52a1\u5668\u77e5\u9053\u300c\u6211\u662f\u8c01\u300d<\/h2>\n\n\n<p class=\"wp-block-paragraph\">\u5fc3\u8df3\u89e3\u51b3\u7684\u662f\u300c\u6211\u8fd8\u6d3b\u7740\u300d\u7684\u95ee\u9898\uff0c\u6ce8\u518c\u5305\u89e3\u51b3\u7684\u662f\u300c\u6211\u662f\u8c01\u300d\u7684\u95ee\u9898\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.1 \u6ce8\u518c\u5305\u7684\u672c\u8d28<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5728 DTU \u548c\u4e32\u53e3\u670d\u52a1\u5668\u4e2d\uff0c\u6ce8\u518c\u5305\u662f\u8bbe\u5907\u5728\u5efa\u7acb TCP \u8fde\u63a5\u540e\u53d1\u9001\u7684\u7b2c\u4e00\u5305\u6570\u636e\uff0c\u7528\u4e8e\u5411\u670d\u52a1\u5668\u58f0\u660e\u81ea\u5df1\u7684\u8eab\u4efd\u3002\u670d\u52a1\u5668\u6839\u636e\u6ce8\u518c\u5305\u7684\u5185\u5bb9\uff0c\u5c06\u5f53\u524d TCP \u8fde\u63a5\u4e0e\u9884\u5148\u6ce8\u518c\u7684\u8bbe\u5907\u8bb0\u5f55\u8fdb\u884c\u5173\u8054\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a\u5178\u578b\u7684 DTU \u6ce8\u518c\u6d41\u7a0b\uff1a<\/p>\n\n\n<ol class=\"wp-block-list\"><li>DTU \u4e0a\u7535\u3001\u62e8\u53f7\u3001\u9644\u7740 4G \u7f51\u7edc<\/li><li>DTU \u901a\u8fc7 TCP \u8fde\u63a5\u5230\u670d\u52a1\u5668\u7684\u6307\u5b9a\u7aef\u53e3<\/li><li>\u8fde\u63a5\u5efa\u7acb\u6210\u529f\u540e\uff0cDTU \u7acb\u5373\u53d1\u9001\u6ce8\u518c\u5305\uff08\u53ef\u4ee5\u662f\u4e00\u4e32\u81ea\u5b9a\u4e49\u5b57\u7b26\uff0c\u4e5f\u53ef\u4ee5\u662f IMEI\/ICCID\uff09<\/li><li>\u670d\u52a1\u5668\u89e3\u6790\u6ce8\u518c\u5305\uff0c\u8bc6\u522b\u8bbe\u5907\u8eab\u4efd\uff0c\u66f4\u65b0\u8bbe\u5907\u5728\u7ebf\u72b6\u6001<\/li><li>\u6ce8\u518c\u5b8c\u6210\uff0c\u5f00\u59cb\u6b63\u5e38\u7684\u53cc\u5411\u6570\u636e\u900f\u4f20<\/li><\/ol>\n\n\n<h3 class=\"wp-block-heading\">4.2 \u6ce8\u518c\u5305\u7684\u4e24\u79cd\u53d1\u9001\u65f6\u673a<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u6709\u4e9b DTU \u652f\u6301\u4e24\u79cd\u6ce8\u518c\u5305\u53d1\u9001\u65b9\u5f0f\uff1a<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8fde\u63a5\u65f6\u53d1\u9001\u4e00\u6b21<\/strong>\uff1a\u53ea\u5728 TCP \u8fde\u63a5\u5efa\u7acb\u65f6\u53d1\u9001\u3002\u6b64\u540e\u6b63\u5e38\u7684\u6570\u636e\u900f\u4f20\u4e0d\u518d\u5305\u542b\u6ce8\u518c\u4fe1\u606f\u3002\u8fd9\u9002\u7528\u4e8e\u670d\u52a1\u5668\u6309\u8fde\u63a5\u7ba1\u7406\u8bbe\u5907\u8eab\u4efd\u7684\u573a\u666f\u2014\u2014\u4e00\u4e2a TCP \u8fde\u63a5\u5bf9\u5e94\u4e00\u53f0\u8bbe\u5907\uff0c\u8fde\u63a5\u5efa\u7acb\u540e\u8eab\u4efd\u5c31\u786e\u5b9a\u4e86\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6bcf\u5305\u6570\u636e\u524d\u9644\u52a0<\/strong>\uff1a\u628a\u6ce8\u518c\u5305\u9644\u52a0\u5728\u6bcf\u6b21\u900f\u4f20\u6570\u636e\u7684\u524d\u9762\u3002\u9002\u7528\u4e8e\u591a\u4e2a\u8bbe\u5907\u901a\u8fc7\u540c\u4e00\u4e2a\u4e32\u53e3\u670d\u52a1\u5668\u6216\u7f51\u5173\u63a5\u5165\u7684\u573a\u666f\u2014\u2014\u670d\u52a1\u5668\u9700\u8981\u901a\u8fc7\u6bcf\u5305\u6570\u636e\u4e2d\u7684\u6ce8\u518c\u4fe1\u606f\u6765\u5224\u65ad\u6570\u636e\u6765\u6e90\u8bbe\u5907\u3002\u7f3a\u70b9\u662f\u589e\u52a0\u4e86\u6bcf\u5305\u6570\u636e\u7684\u5f00\u9500\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u6709\u4eba DTU \u4e3a\u4f8b\uff0c\u4f7f\u7528\u6ce8\u518c\u5305\u7684\u914d\u7f6e\u65b9\u5f0f\uff1a<\/p>\n\n\n<ul class=\"wp-block-list\"><li>\u52fe\u9009\u300c\u542f\u7528\u6ce8\u518c\u5305\u300d<\/li><li>\u9009\u62e9\u53d1\u9001\u65b9\u5f0f\uff1a\u300c\u8fde\u63a5\u65f6\u53d1\u9001\u4e00\u6b21\u300d\u6216\u300c\u5411\u670d\u52a1\u5668\u53d1\u9001\u7684\u6bcf\u4e2a\u6570\u636e\u5305\u524d\u90fd\u52a0\u4e0a\u300d<\/li><li>\u81ea\u5b9a\u4e49\u6ce8\u518c\u5305\u5185\u5bb9\uff08\u5982 <code>01<\/code> \u8868\u793a 1 \u53f7\u8bbe\u5907\uff0c<code>02<\/code> \u8868\u793a 2 \u53f7\u8bbe\u5907\uff09<\/li><li>\u670d\u52a1\u5668\u63a5\u6536\u5230\u7684\u6570\u636e\u683c\u5f0f\u4e3a\uff1a<code>\u6ce8\u518c\u5305 + \u900f\u4f20\u6570\u636e<\/code><\/li><\/ul>\n\n\n<h3 class=\"wp-block-heading\">4.3 \u6ce8\u518c\u5305\u7684\u6570\u636e\u5185\u5bb9\u8bbe\u8ba1<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u518c\u5305\u7684\u5185\u5bb9\u53d6\u51b3\u4e8e\u4f60\u7684\u540e\u7aef\u67b6\u6784\u3002\u5e38\u89c1\u7684\u505a\u6cd5\uff1a<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4f7f\u7528 IMEI \u4f5c\u4e3a\u8bbe\u5907\u552f\u4e00\u6807\u8bc6<\/strong>\u3002IMEI\uff08\u56fd\u9645\u79fb\u52a8\u8bbe\u5907\u8bc6\u522b\u7801\uff09\u662f 15 \u4f4d\u6570\u5b57\uff0c\u5168\u7403\u552f\u4e00\uff0c\u70e7\u5728 4G \u6a21\u7ec4\u91cc\u6539\u4e0d\u4e86\u3002DTU \u542f\u52a8\u65f6\u8bfb\u53d6\u6a21\u7ec4\u7684 IMEI\uff0c\u4f5c\u4e3a\u6ce8\u518c\u5305\u53d1\u7ed9\u670d\u52a1\u5668\u3002\u4f18\u70b9\u662f\u5929\u7136\u552f\u4e00\u3001\u4e0d\u9700\u8981\u4eba\u4e3a\u5206\u914d\uff1b\u7f3a\u70b9\u662f IMEI \u957f\u5ea6 15 \u5b57\u8282\uff0c\u5982\u679c\u9700\u8981\u6781\u81f4\u7701\u6d41\u91cf\uff0c\u53ef\u4ee5\u8003\u8651\u7528\u5e73\u53f0\u4fa7\u9884\u5206\u914d\u7684\u77ed ID\uff082-4 \u5b57\u8282\uff09\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4f7f\u7528\u5e73\u53f0\u9884\u5206\u914d\u7684\u5e8f\u5217\u53f7<\/strong>\u3002\u5728\u4e91\u5e73\u53f0\u4e0a\u6ce8\u518c\u8bbe\u5907\u65f6\uff0c\u5e73\u53f0\u751f\u6210\u4e00\u4e2a\u552f\u4e00\u5e8f\u5217\u53f7\uff08\u53ef\u4ee5\u662f\u81ea\u589e ID\uff0c\u4e5f\u53ef\u4ee5\u662f UUID \u7684\u77ed\u54c8\u5e0c\uff09\u3002\u901a\u8fc7\u914d\u7f6e\u5de5\u5177\u5199\u5165 DTU\uff0cDTU \u8fde\u63a5\u65f6\u53d1\u9001\u8fd9\u4e2a\u5e8f\u5217\u53f7\u3002\u4f18\u70b9\u662f\u5e8f\u5217\u53f7\u53ef\u63a7\u5236\uff08\u6bd4\u5982\u6309\u533a\u57df\u7f16\u7801\uff09\uff0c\u4e14\u957f\u5ea6\u77ed\uff1b\u7f3a\u70b9\u662f\u9700\u8981\u4e00\u4e2a\u914d\u7f6e\u4e0b\u53d1\u6d41\u7a0b\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4f7f\u7528 ICCID<\/strong>\u3002SIM \u5361\u7684 ICCID \u4e5f\u662f 20 \u4f4d\u6570\u5b57\uff0c\u552f\u4e00\u3002\u4f46\u4e00\u822c\u4e0d\u63a8\u8350\u2014\u2014\u56e0\u4e3a SIM \u5361\u53ef\u80fd\u66f4\u6362\uff0c\u800c\u8bbe\u5907\u4e0d\u5e94\u8be5\u56e0\u4e3a\u6362\u5361\u800c\u53d8\u6210\u300c\u53e6\u4e00\u53f0\u8bbe\u5907\u300d\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.4 \u4e91\u5e73\u53f0\u7684\u8bbe\u5907\u6ce8\u518c\u4e0e DTU \u6ce8\u518c\u5305\u7684\u5173\u7cfb<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5728\u534e\u4e3a\u4e91 IoTDA \u6216\u963f\u91cc\u4e91 IoT \u8fd9\u7c7b\u6807\u51c6\u7269\u8054\u7f51\u5e73\u53f0\u4e2d\uff0c\u8bbe\u5907\u6ce8\u518c\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\u6d41\u7a0b\uff1a<\/p>\n\n\n<ol class=\"wp-block-list\"><li>\u5148\u5728\u5e73\u53f0\u4e0a\u521b\u5efa\u4ea7\u54c1\uff08\u5b9a\u4e49\u8bbe\u5907\u7684\u6570\u636e\u6a21\u578b\uff09<\/li><li>\u7136\u540e\u6ce8\u518c\u8bbe\u5907\uff08\u5e73\u53f0\u751f\u6210 Device ID \u548c Device Secret\uff09<\/li><li>\u5c06\u8fd9\u4e9b\u51ed\u636e\u5199\u5165\u8bbe\u5907\u7684\u56fa\u4ef6\u6216\u914d\u7f6e\u6587\u4ef6<\/li><li>\u8bbe\u5907\u542f\u52a8\u65f6\uff0c\u51ed Device ID \u548c Secret \u5411\u5e73\u53f0\u53d1\u8d77\u8ba4\u8bc1\u8fde\u63a5\uff08\u901a\u5e38\u901a\u8fc7 MQTT \u7684 Username\/Password \u5b57\u6bb5\u6216\u8005 X.509 \u8bc1\u4e66\uff09<\/li><\/ol>\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u6d41\u7a0b\u91cc\uff0cDTU \u7684\u300c\u6ce8\u518c\u5305\u300d\u5176\u5b9e\u662f\u5bf9\u5e94\u5e73\u53f0\u7684\u8bbe\u5907\u8ba4\u8bc1\u4fe1\u606f\u3002\u6bd4\u5982 AIRIOT \u5e73\u53f0\u8981\u6c42\u8bbe\u5907\u5efa\u7acb TCP \u8fde\u63a5\u540e\u7b2c\u4e00\u65f6\u95f4\u53d1\u9001\u5e8f\u5217\u53f7\uff0c\u672c\u8d28\u4e0a\u5c31\u662f\u4e00\u4e2a\u7b80\u5316\u7248\u7684\u8bbe\u5907\u8ba4\u8bc1\u534f\u8bae\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5982\u679c\u4f60\u7684\u540e\u7aef\u670d\u52a1\u5668\u662f\u81ea\u5df1\u5f00\u53d1\u7684<\/strong>\uff0c\u90a3\u6ce8\u518c\u534f\u8bae\u5b8c\u5168\u7531\u4f60\u8bbe\u8ba1\u3002\u6838\u5fc3\u8981\u6c42\u5c31\u4e24\u4e2a\uff1a\u8bbe\u5907\u8eab\u4efd\u552f\u4e00\u3001\u670d\u52a1\u5668\u80fd\u9a8c\u660e\u6b63\u8eab\u3002\u6700\u7b80\u65b9\u6848\u2014\u20144G DTU \u7528 IMEI \u6ce8\u518c + \u56fa\u5b9a\u5bc6\u94a5 HMAC \u7b7e\u540d\uff0c\u8db3\u4ee5\u6ee1\u8db3\u5927\u591a\u6570\u975e\u91d1\u878d\u7ea7\u5b89\u5168\u8981\u6c42\u7684\u5de5\u4e1a\u573a\u666f\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u5b8c\u6574\u53c2\u6570\u63a8\u8350\u4e0e\u5b9e\u6218\u914d\u7f6e<\/h2>\n\n\n<h3 class=\"wp-block-heading\">5.1 \u5fc3\u8df3\u53c2\u6570\u63a8\u8350\u503c<\/h3>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u573a\u666f<\/th><th>\u5fc3\u8df3\u95f4\u9694<\/th><th>\u5fc3\u8df3\u8d85\u65f6\uff08\u8fde\u7eed\u5931\u8d25\uff09<\/th><th>\u8bf4\u660e<\/th><\/tr><\/thead><tbody><tr><td>4G DTU \u900f\u4f20\uff08TCP\uff09<\/td><td>30-60 \u79d2<\/td><td>3 \u6b21\uff0890-180 \u79d2\uff09<\/td><td>\u5e94\u5bf9 NAT \u8d85\u65f6\uff0c\u517c\u987e\u6d41\u91cf<\/td><\/tr><tr><td>4G DTU \u900f\u4f20\uff08UDP\uff09<\/td><td>15-30 \u79d2<\/td><td>5 \u6b21\uff0875-150 \u79d2\uff09<\/td><td>UDP \u65e0\u8fde\u63a5\uff0c\u5fc3\u8df3\u66f4\u9891\u7e41<\/td><\/tr><tr><td>MQTT\uff08WiFi\/\u4ee5\u592a\u7f51\uff09<\/td><td>60-120 \u79d2<\/td><td>1.5\u00d7KeepAlive<\/td><td>\u9075\u5faa MQTT \u534f\u8bae\u89c4\u8303<\/td><\/tr><tr><td>NB-IoT \/ \u7535\u6c60\u4f9b\u7535<\/td><td>300-600 \u79d2<\/td><td>2 \u6b21\uff08600-1200 \u79d2\uff09<\/td><td>\u7701\u7535\u4f18\u5148\uff0c\u63a5\u53d7\u8f83\u957f\u79bb\u7ebf\u53d1\u73b0\u65f6\u95f4<\/td><\/tr><tr><td>\u5c40\u57df\u7f51 Modbus TCP \u7f51\u5173<\/td><td>120-300 \u79d2<\/td><td>3 \u6b21<\/td><td>\u6709\u7ebf\u7f51\u7edc\u7a33\u5b9a\uff0c\u53ef\u653e\u5bbd<\/td><\/tr><tr><td>WiFi \u4e32\u53e3\u670d\u52a1\u5668<\/td><td>30-60 \u79d2<\/td><td>3 \u6b21<\/td><td>WiFi \u6389\u7ebf\u6982\u7387\u9ad8\u4e8e\u6709\u7ebf<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<h3 class=\"wp-block-heading\">5.2 Linux \u670d\u52a1\u5668\u4fa7 TCP KeepAlive \u53c2\u6570\u63a8\u8350<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5728 <code>\/etc\/sysctl.conf<\/code> \u4e2d\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>net.ipv4.tcp_keepalive_time = 120\nnet.ipv4.tcp_keepalive_intvl = 10\nnet.ipv4.tcp_keepalive_probes = 3<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u7136\u540e <code>sysctl -p<\/code> \u5e94\u7528\u3002\u52a0\u4e0a\u5e94\u7528\u5c42\u5fc3\u8df3\uff08\u5982 60 \u79d2\u95f4\u9694\uff09\uff0c\u4e24\u5c42\u4fdd\u6d3b\u4e92\u76f8\u515c\u5e95\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">5.3 DTU \u5b9e\u9645\u914d\u7f6e\u793a\u4f8b<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5178\u578b\u7684 4G DTU \u914d\u7f6e\u65b9\u6848\uff08\u4ee5\u6709\u4eba USR-G780 \u4e3a\u4f8b\uff09\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>\u5fc3\u8df3\u5305\uff1a\u542f\u7528\n\u5fc3\u8df3\u5468\u671f\uff1a60 \u79d2\n\u5fc3\u8df3\u5185\u5bb9\uff1aQ\uff08\u81ea\u5b9a\u4e49\u5b57\u7b26\u4e32\uff09\n\n\u6ce8\u518c\u5305\uff1a\u542f\u7528\n\u6ce8\u518c\u5305\u53d1\u9001\u65b9\u5f0f\uff1a\u8fde\u63a5\u65f6\u53d1\u9001\u4e00\u6b21\n\u6ce8\u518c\u5305\u5185\u5bb9\uff1aIMEI\uff08\u4f7f\u7528\u8bbe\u5907 IMEI \u4f5c\u4e3a\u552f\u4e00\u6807\u8bc6\uff09\n\n\u8fde\u63a5\u7c7b\u578b\uff1aTCP Client\n\u670d\u52a1\u5668\u5730\u5740\uff1ayour-server.com\n\u670d\u52a1\u5668\u7aef\u53e3\uff1a8001\n\u65ad\u7ebf\u91cd\u8fde\uff1a\u542f\u7528\uff0c\u95f4\u9694 10 \u79d2\uff0c\u6700\u591a\u91cd\u8fde 30 \u6b21<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u670d\u52a1\u5668\u4fa7\u5bf9\u5e94\u903b\u8f91\uff1a<\/p>\n\n\n<ol class=\"wp-block-list\"><li>\u6536\u5230 TCP \u8fde\u63a5\u8bf7\u6c42 \u2192 \u63a5\u53d7\u8fde\u63a5<\/li><li>\u7b49\u5f85 5 \u79d2\u5185\u6536\u5230\u6ce8\u518c\u5305 \u2192 \u63d0\u53d6 IMEI\uff0c\u67e5\u6570\u636e\u5e93\u5339\u914d\u8bbe\u5907\u5217\u8868 \u2192 \u66f4\u65b0\u8bbe\u5907\u5728\u7ebf\u72b6\u6001\u4e3a Online<\/li><li>5 \u79d2\u5185\u6ca1\u6536\u5230\u6ce8\u518c\u5305 \u2192 \u5224\u5b9a\u4e3a\u975e\u6cd5\u8fde\u63a5\uff0c\u5173\u95ed socket<\/li><li>\u6ce8\u518c\u6210\u529f\u540e\uff0c\u542f\u52a8\u5fc3\u8df3\u5b9a\u65f6\u5668\uff0c\u671f\u5f85\u6bcf 60 \u79d2\u6536\u5230 &#8220;Q&#8221; \u2192 \u56de\u590d &#8220;A&#8221;<\/li><li>\u8fde\u7eed 3 \u4e2a\u5fc3\u8df3\u5468\u671f\uff08180 \u79d2\uff09\u6ca1\u6536\u5230 &#8220;Q&#8221; \u2192 \u5224\u5b9a\u8bbe\u5907\u79bb\u7ebf\uff0c\u89e6\u53d1\u91cd\u8fde \/ \u544a\u8b66<\/li><\/ol>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u5fc3\u8df3\u4e0e\u6ce8\u518c\u7684\u5e38\u89c1\u5751<\/h2>\n\n\n<h3 class=\"wp-block-heading\">6.1 NAT \u8d85\u65f6\u548c\u5fc3\u8df3\u5468\u671f\u4e0d\u5339\u914d<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u6700\u5e38\u89c1\u7684\u95ee\u9898\uff1a\u5fc3\u8df3\u5468\u671f\u8bbe\u4e86 5 \u5206\u949f\uff0c\u8fd0\u8425\u5546 NAT \u8d85\u65f6\u662f 2 \u5206\u949f\u3002\u7ed3\u679c\u662f\u6bcf\u4e00\u6b21\u5fc3\u8df3\u95f4\u9694\uff0cNAT \u5df2\u7ecf\u65ad\u4e86\uff0c\u5fc3\u8df3\u5305\u53d1\u4e0d\u51fa\u53bb\uff0c\u8bbe\u5907\u6c38\u8fdc\u5904\u4e8e\u300c\u8fde\u4e0a\u21922 \u5206\u949f\u540e\u65ad\u5f00\u2192\u5fc3\u8df3\u8d85\u65f6\u91cd\u8fde\u2192\u8fde\u4e0a\u21922 \u5206\u949f\u540e\u65ad\u5f00\u300d\u7684\u65e0\u9650\u5faa\u73af\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u8bca\u65ad\u65b9\u6cd5\uff1a\u5728\u670d\u52a1\u5668\u4fa7\u770b\u540c\u4e00\u4e2a\u8bbe\u5907\u7684\u8fde\u63a5\u5efa\u7acb\u65f6\u95f4\u548c\u65ad\u5f00\u65f6\u95f4\uff0c\u5982\u679c\u65ad\u5f00\u65f6\u95f4 &#8211; \u5efa\u7acb\u65f6\u95f4\u51e0\u4e4e\u6bcf\u6b21\u90fd\u662f\u4e00\u4e2a\u56fa\u5b9a\u503c\uff08\u6bd4\u5982 120 \u79d2\uff09\uff0c\u57fa\u672c\u5c31\u662f NAT \u8d85\u65f6\u95ee\u9898\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u89e3\u51b3\uff1a\u5fc3\u8df3\u5468\u671f &lt; 120 \u79d2\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">6.2 \u6ce8\u518c\u5305\u6ca1\u6709\u5728\u8fde\u63a5\u5efa\u7acb\u540e\u7acb\u5373\u53d1\u9001<\/h3>\n\n\n<p class=\"wp-block-paragraph\">DTU \u5efa\u7acb TCP \u8fde\u63a5\u540e\uff0c\u5982\u679c\u5148\u53d1\u9001\u7684\u662f\u900f\u4f20\u6570\u636e\u800c\u4e0d\u662f\u6ce8\u518c\u5305\uff0c\u670d\u52a1\u5668\u65e0\u6cd5\u8bc6\u522b\u8fd9\u4e2a\u6570\u636e\u6765\u81ea\u54ea\u53f0\u8bbe\u5907\u2014\u2014\u5c24\u5176\u662f\u5f53\u591a\u4e2a\u8bbe\u5907\u5171\u4eab\u4e00\u4e2a\u670d\u52a1\u5668\u7aef\u53e3\u65f6\uff0c\u6536\u5230\u7684\u7b2c\u4e00\u5305\u6570\u636e\u5982\u679c\u4e0d\u662f\u6ce8\u518c\u5305\uff0c\u670d\u52a1\u5668\u53ea\u80fd\u4e22\u5f03\u6216\u5173\u95ed\u8fde\u63a5\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5fc5\u987b\u4fdd\u8bc1\uff1a\u6ce8\u518c\u5305\u5728 socket connect \u6210\u529f\u540e\u4ee5\u6700\u5feb\u901f\u5ea6\u53d1\u51fa\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">6.3 \u53cc\u5411\u5fc3\u8df3\u53ea\u505a\u4e86\u4e00\u65b9<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u8bbe\u5907\u53d1\u5fc3\u8df3\u3001\u670d\u52a1\u5668\u4e0d\u56de\u590d\u2014\u2014\u670d\u52a1\u5668\u77e5\u9053\u8bbe\u5907\u6d3b\u7740\uff0c\u4f46\u8bbe\u5907\u4e0d\u77e5\u9053\u670d\u52a1\u5668\u662f\u4e0d\u662f\u8fd8\u6d3b\u7740\u3002\u5982\u679c\u670d\u52a1\u5668\u56e0\u4e3a\u7a0b\u5e8f bug \u6216\u7f51\u7edc\u95ee\u9898\u4e0d\u518d\u56de\u590d\u5fc3\u8df3\uff0c\u8bbe\u5907\u53ef\u80fd\u8fd8\u5728\u7ee7\u7eed\u7b49\u7740\uff0c\u76f4\u5230\u4e1a\u52a1\u6570\u636e\u53d1\u9001\u8d85\u65f6\u624d\u610f\u8bc6\u5230\u51fa\u4e8b\u4e86\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u53cc\u5411\u5fc3\u8df3\u8ba9\u8bbe\u5907\u4fa7\u4e5f\u80fd\u4e3b\u52a8\u53d1\u73b0\u670d\u52a1\u5668\u5f02\u5e38\u5e76\u89e6\u53d1\u91cd\u8fde\u3002\u5bf9\u4e8e\u5206\u5e03\u5728\u5168\u56fd\u5404\u5730\u3001\u65e0\u4eba\u503c\u5b88\u7684 DTU \u8bbe\u5907\uff0c\u8fd9\u4e00\u6761\u5f88\u91cd\u8981\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">6.4 TCP KeepAlive \u7684\u8de8\u5e73\u53f0\u5dee\u5f02<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Windows\u3001Linux\u3001FreeRTOS\u3001LwIP \u5bf9 TCP KeepAlive \u7684\u9ed8\u8ba4\u503c\u548c\u53ef\u914d\u7f6e\u53c2\u6570\u90fd\u4e0d\u4e00\u6837\u3002Linux \u9ed8\u8ba4 7200 \u79d2\uff0cWindows \u9ed8\u8ba4 7200000 \u6beb\u79d2\uff082 \u5c0f\u65f6\uff09\uff0cLwIP\uff08\u5d4c\u5165\u5f0f TCP \u534f\u8bae\u6808\uff09\u9ed8\u8ba4\u4e5f\u5f88\u5927\u3002\u5343\u4e07\u4e0d\u8981\u4f9d\u8d56\u9ed8\u8ba4\u503c\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">6.5 \u6ce8\u518c\u5305\u5185\u5bb9\u6ca1\u6709\u505a\u6821\u9a8c<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u6ce8\u518c\u5305\u662f\u660e\u6587\u4f20\u8f93\uff08\u4f8b\u5982\u76f4\u63a5\u53d1\u4e86 IMEI\uff09\uff0c\u5728\u7f51\u7edc\u94fe\u8def\u4e0a\u53ef\u80fd\u88ab\u6293\u5305\u7be1\u6539\u3002\u5bf9\u4e8e\u5b89\u5168\u6027\u8981\u6c42\u9ad8\u7684\u573a\u666f\uff0c\u6ce8\u518c\u5305\u81f3\u5c11\u5e94\u8be5\u5305\u542b\u4e00\u4e2a\u6458\u8981\u6216\u7b7e\u540d\u3002\u6700\u7b80\u5355\u7684\u505a\u6cd5\uff1a\u8bbe\u5907\u7528\u9884\u7f6e\u7684\u5bf9\u79f0\u5bc6\u94a5\u5bf9 IMEI + \u65f6\u95f4\u6233\u505a HMAC\uff0c\u670d\u52a1\u5668\u9a8c\u8bc1 HMAC \u901a\u8fc7\u540e\u624d\u63a5\u53d7\u6ce8\u518c\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u6392\u67e5\u6e05\u5355<\/h2>\n\n\n<p class=\"wp-block-paragraph\">\u5f53 DTU \u9891\u7e41\u79bb\u7ebf\u65f6\uff0c\u6309\u8fd9\u4e2a\u987a\u5e8f\u6392\u67e5\uff1a<\/p>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u6b65\u9aa4<\/th><th>\u68c0\u67e5\u9879<\/th><th>\u65b9\u6cd5<\/th><th>\u9884\u671f<\/th><\/tr><\/thead><tbody><tr><td>1<\/td><td>\u5fc3\u8df3\u662f\u5426\u771f\u7684\u5728\u53d1<\/td><td>\u6293\u670d\u52a1\u5668\u4fa7\u65e5\u5fd7\/\u6293\u5305<\/td><td>\u6309\u8bbe\u5b9a\u7684\u5fc3\u8df3\u5468\u671f\u7a33\u5b9a\u6536\u5230<\/td><\/tr><tr><td>2<\/td><td>\u5fc3\u8df3\u95f4\u9694 vs NAT \u8d85\u65f6<\/td><td>\u5bf9\u6bd4\u5fc3\u8df3\u5468\u671f\u548c\u8fd0\u8425\u5546 NAT \u8d85\u65f6<\/td><td>\u5fc3\u8df3\u5468\u671f &lt; NAT \u8d85\u65f6 \u00d7 0.6<\/td><\/tr><tr><td>3<\/td><td>\u670d\u52a1\u5668\u662f\u5426\u56de\u590d\u5fc3\u8df3<\/td><td>\u8bbe\u5907\u4fa7\u6293\u65e5\u5fd7<\/td><td>\u53d1\u51fa &#8220;Q&#8221; \u540e\u6536\u5230 &#8220;A&#8221;<\/td><\/tr><tr><td>4<\/td><td>\u65ad\u7ebf\u540e\u662f\u5426\u81ea\u52a8\u91cd\u8fde<\/td><td>\u62d4\u6389 SIM \u5361\u518d\u63d2\u56de<\/td><td>DTU \u81ea\u52a8\u91cd\u65b0\u5efa\u8fde + \u53d1\u9001\u6ce8\u518c\u5305<\/td><\/tr><tr><td>5<\/td><td>\u6ce8\u518c\u5305\u662f\u5426\u7b2c\u4e00\u65f6\u95f4\u53d1\u9001<\/td><td>\u6293\u670d\u52a1\u5668 TCP \u8fde\u63a5\u5efa\u7acb\u540e\u7684\u524d\u51e0\u4e2a\u5305<\/td><td>\u7b2c\u4e00\u4e2a\u6570\u636e\u5305\u5c31\u662f\u6ce8\u518c\u5305<\/td><\/tr><tr><td>6<\/td><td>\u670d\u52a1\u5668\u4fa7 TCP KeepAlive \u53c2\u6570<\/td><td>`sysctl net.ipv4.tcp_keepalive_time`<\/td><td>\u2264 120 \u79d2<\/td><\/tr><tr><td>7<\/td><td>\u8fd0\u8425\u5546\u4fe1\u53f7\u5f3a\u5ea6<\/td><td>DTU AT \u6307\u4ee4 `AT+CSQ`<\/td><td>\u2265 15\uff08\u4f4e\u4e8e 10 \u4e0d\u7a33\u5b9a\uff09<\/td><\/tr><tr><td>8<\/td><td>SIM \u5361\u6d41\u91cf\u5230\u671f \/ \u6b20\u8d39<\/td><td>\u8fd0\u8425\u5546\u540e\u53f0\u67e5\u8be2<\/td><td>\u6d41\u91cf\u5145\u8db3\u3001\u65e0\u6b20\u8d39\u6682\u505c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<p class=\"wp-block-paragraph\">\u5fc3\u8df3\u548c\u6ce8\u518c\u5305\u8bf4\u8d77\u6765\u6982\u5ff5\u5f88\u7b80\u5355\u2014\u2014\u5b9a\u65f6\u53d1\u4e2a\u5305\u3001\u8868\u660e\u81ea\u5df1\u662f\u8c01\u3002\u4f46\u771f\u6b63\u505a\u8d77\u6765\uff0c\u7ec6\u8282\u90fd\u5728\u53c2\u6570\u9009\u62e9\u548c\u5bf9\u6545\u969c\u6a21\u5f0f\u7684\u9884\u5224\u4e0a\u3002\u8fd9\u7bc7\u6587\u7ae0\u7ed9\u7684\u90a3\u4e9b\u6570\u5b57\uff0830 \u79d2\u300160 \u79d2\u3001120 \u79d2\uff09\u4e0d\u662f\u968f\u4fbf\u5199\u7684\u2014\u2014\u662f\u6839\u636e\u56fd\u5185\u4e09\u5927\u8fd0\u8425\u5546\u7684 NAT \u8d85\u65f6\u30014G \u6a21\u7ec4\u7684\u529f\u8017\u7ea6\u675f\u3001\u670d\u52a1\u5668\u8d44\u6e90\u5f00\u9500\u4e09\u8005\u7684\u5e73\u8861\u70b9\u3002\u4f60\u81ea\u5df1\u7684\u9879\u76ee\u5982\u679c\u573a\u666f\u4e0d\u4e00\u6837\uff0c\u81ea\u5df1\u5728\u6d4b\u8bd5\u73af\u5883\u91cc\u6293\u5305\u9a8c\u8bc1\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u6709\u95ee\u9898\u518d\u804a\u3002<\/p>\n<span 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