从Paho到AWS的连接失败

Question

我正在尝试使用paho MQTT C库连接到AWS。我已经正确设置了我的AWS物品和证书。我通过使用mosquitto和MQTTFx工具进行发布进行了测试。

我尝试将连接URL，证书文件和密钥映射到MQTTClient.ssl所需的参数，但是连接调用始终失败。

我不能在此处发布整个代码，所以我只发布相关的代码。

 #define ADDRESS     "ssl://xxxxxxxxxxxxxxxx-2.amazonaws.com:8883"
 #define CLIENTID    "testclient"
 #define TOPIC_REQ   "req/16000393" //this is the topic I'm subscribing to at AWS side (publishing from client laptop)
...
#define CRT_FILE    "./certificate.pem.crt"
#define KEY_FILE    "./private.pem.key"
#define CA_FILE     "./rootCA.pem" 
...
 int main(int argc, char* argv[])
 {
      MQTTClient client;
      MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer;
      MQTTClient_message pubmsg = MQTTClient_message_initializer;
      MQTTClient_deliveryToken token;

      MQTTClient_SSLOptions sslopts = MQTTClient_SSLOptions_initializer;

      int rc;
      int ch;

      conn_opts.ssl = &sslopts;
      conn_opts.ssl->trustStore = CRT_FILE;
      conn_opts.ssl->keyStore = CA_FILE;
      conn_opts.ssl->privateKey = KEY_FILE;
      conn_opts.ssl->verify = 1;

      MQTTClient_create(&client, ADDRESS, CLIENTID,
          MQTTCLIENT_PERSISTENCE_NONE, NULL);
      conn_opts.keepAliveInterval = 20;
      conn_opts.cleansession = 1;

      MQTTClient_setCallbacks(client, NULL, connlost, msgarrvd, delivered);

      if ((rc = MQTTClient_connect(client, &conn_opts)) != MQTTCLIENT_SUCCESS)
      {
          printf("Failed to connect, return code %d\n", rc);
          exit(EXIT_FAILURE);
      }
...

连接不断失败。请帮助！我没主意了。