Hw to use lwip + mqtt api with mbedtls?
Hi there. i made stm32 + rtos + lwip/mqtt solution and it works well. Now i want to use it with embed tls secure connection. I did not find any exemples.
lwip mqtt api support tls comunication. But there are no such example like just simple mqtt client using code was here: MQTT client.
I tried to enable embedtls and some options in cubemx, LWIP_ALTCP & LWIP_ALTCP_TLS, add LWIP_ALTCP_TLS_MBEDTLS to Path. It compiled. How to init mbedtls and add tls cert.. this link takes a little info
Application layered TCP Introduction.
Has anyebody some expirience or working example with mqtt + tls (mbedtls) for stm32 lwip stack?
UPD.
Here is my code of mqtt client setup:
struct mqtt_connect_client_info_t ci;
memset(&ci, 0, sizeof(ci));
ci.client_id = "lwip_test";
ci.client_user = "";
ci.client_pass = "";
ci.keep_alive = 0;
ci.tls_config = altcp_tls_create_config_client((const u8_t*)test_cert, sizeof(test_cert));
// create client
client = mqtt_client_new();
// connect client
mqtt_client_connect(client, &resolved, port, mqtt_on_connect, (void *)0, &ci);I give mqtt client ca certificate and length. I have an error in
*altcp_tls_create_config_client_common* function (altcp_tls_mbedtls.c) with code -4480 (Failed to allocate memory).
ret = mbedtls_x509_crt_parse(conf->ca, ca, ca_len);
if (ret != 0) {
LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("mbedtls_x509_crt_parse ca failed: %d 0x%x", ret, -1*ret));
altcp_mbedtls_free_config(conf);
return NULL;
}What i am doing wrong, whitch options else i should set up in mbedtls module?
I use default was generated by CubeMX