#include
#include
void my_log_callback(struct mosquitto *mosq, void *obj, int level, const char *str)
{
printf("LOG: %s\n", str);
}
int main(int argc, char *argv[])
{
struct mosquitto *mosq = NULL;
int rc;
printf("Calling connect before lib init, this should fail.\n");
mosq = mosquitto_new(NULL, true, NULL);
mosquitto_log_callback_set(mosq, my_log_callback);
mosquitto_tls_set(mosq, "mosquitto.org.crt", NULL, NULL, NULL, NULL);
rc = mosquitto_connect(mosq, "test.mosquitto.org", 8883, 60);
printf("connect returned %d\n", rc);
mosquitto_destroy(mosq);
mosquitto_lib_init();
printf("Calling connect after lib init, this should be fine.\n");
mosq = mosquitto_new(NULL, true, NULL);
mosquitto_log_callback_set(mosq, my_log_callback);
mosquitto_tls_set(mosq, "mosquitto.org.crt", NULL, NULL, NULL, NULL);
rc = mosquitto_connect(mosq, "test.mosquitto.org", 8883, 60);
printf("connect returned %d\n", rc);
mosquitto_destroy(mosq);
mosquitto_lib_cleanup();
printf("Calling connect after lib cleanup, this should fail.\n");
mosq = mosquitto_new(NULL, true, NULL);
mosquitto_log_callback_set(mosq, my_log_callback);
mosquitto_tls_set(mosq, "mosquitto.org.crt", NULL, NULL, NULL, NULL);
rc = mosquitto_connect(mosq, "test.mosquitto.org", 8883, 60);
printf("connect returned %d\n", rc);
mosquitto_destroy(mosq);
return 0;
}
运行之后报错如下:
➜ my-mqtt ./sub
Error: Unable to create TLS context.
OpenSSL Error: error:140A90A1:lib(20):func(169):reason(161)
Unable to connect.
解决方案:
没有在开头调用初始化函数,导致没有初始化OpenSSL,在代码中加入初始化函数即可:
mosquitto_lib_init();