HarmonyOS Mqtt无法Connect成功

请参考以下步骤：

1、最新的@ohos/mqtt库已经开启ssl功能，无需手动编译openSSL。

2、url需要带上协议名：

ssl://117.78.34.59:53483

sslOptions: {
  // true: enable server certificate authentication, false: disable,default is true.
  enableServerCertAuth: true,
  // Sandbox path for CA certificate
  // If enableServerCertAuth is true, a CA certificate needs to be passed
  // If enableServerCertAuth is false, a CA certificate does not need to be passed
  trustStore: fileDir + "/test_ca.crt", // 这个是CA证书
  keyStore: fileDir + "/client.crt",
  privateKey: fileDir + "/client_key.pem",
}