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首页 业界区 安全 【ESP32】使用 MQTT(S) 连接华为云 IoT

【ESP32】使用 MQTT(S) 连接华为云 IoT

缀访 8 小时前
1. 引言

2. 证书鉴权

相关文档链接:
IoT文档_MQTT(S)协议接入_证书鉴权
此链接中提到了有两种证书:

  • 自定义设备 CA 调测证书
    (是华为云用来确认此设备是合法注册设备的证书,用于设备身份鉴权)
  • 华为云 CA 根证书
    (是验证华为云服务器身份的证书,确保是直连华为云 IoT,设备中必须持有对应的根证书来验证服务器)
我们这里只需要连接上华为云 IoT,所以暂时只需要第二个华为云 CA 根证书。
2.1 获取华为云 CA 根证书

华为云官方资源获取链接_证书资源
我们这里用的是 MQTT(S) 连接的华为云 IoT,下载最后一个即可:
1.png

2.2 获取 R3 根证书

打开下载好的压缩包,解压 C 中的文件,得到一份根证书 GlobalSign-rootca.pem:
点击查看代码
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  54. -----BEGIN CERTIFICATE-----
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  84. -----END CERTIFICATE-----
复制代码
这三个都是 GlobalSign 根证书,属于同一家 CA 机构的不同根证书版本:
序号名称有效期说明第1段GlobalSign Root CA - R32009 ~ 2029较老的根证书,仍在用第2段GlobalSign Root CA - R62014 ~ 2034较新的根证书第3段GlobalSign Root R462019 ~ 2046最新的根证书
华为云IoT平台当前使用的服务器证书,其信任链追溯到的根证书是 GlobalSign Root CA - R3,所以我们只用到前面一段。
ps. 有两种方法:一、用字符串放在代码中;二、将文件烧录到 flash 中(这个还没学,以后学了单独拿出来说
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