How to use MQTT+TLS in nRF9160?

[Yusuke]

I'm working on a project using nRF9160 DK.

How can you use MQTT+TLS in nRF9160?

Where should ca certificate file be stored?

I modified the code below in mqtt_simple project. What code should I modify additionaly?

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<prj.conf>

CONFIG_MQTT_LIB_TLS=y

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<prj.conf>
CONFIG_MQTT_LIB_TLS=y

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<main.c>

/**@brief Initialize the MQTT client structure

*/

static void client_init(struct mqtt_client *client)

{

mqtt_client_init(client);

broker_init();

/* Add from here */

static struct mqtt_utf8 password;

static struct mqtt_utf8 user_name;

password.utf8 = (u8_t *)MQTT_PASSWORD;

password.size = strlen(MQTT_PASSWORD);

user_name.utf8 = (u8_t *)MQTT_USERNAME;

user_name.size = strlen(MQTT_USERNAME);

/* to here */

/* MQTT client configuration */

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<main.c>

/**@brief Initialize the MQTT client structure
 */
static void client_init(struct mqtt_client *client)
{
	mqtt_client_init(client);

	broker_init();

        /* Add from here */
        static struct mqtt_utf8 password;
	static struct mqtt_utf8 user_name;

	password.utf8 = (u8_t *)MQTT_PASSWORD;
	password.size = strlen(MQTT_PASSWORD);
	user_name.utf8 = (u8_t *)MQTT_USERNAME;
	user_name.size = strlen(MQTT_USERNAME);
        /* to here */

	/* MQTT client configuration */
	client->broker = &broker;
	client->evt_cb = mqtt_evt_handler;
	client->client_id.utf8 = (u8_t *)CONFIG_MQTT_CLIENT_ID;
	client->client_id.size = strlen(CONFIG_MQTT_CLIENT_ID);
	client->password = &password; // Add here
	client->user_name = &user_name; // Add here
	client->protocol_version = MQTT_VERSION_3_1_0; // originally MQTT_VERSION_3_1_1

	/* MQTT buffers configuration */
	client->rx_buf = rx_buffer;
	client->rx_buf_size = sizeof(rx_buffer);
	client->tx_buf = tx_buffer;
	client->tx_buf_size = sizeof(tx_buffer);

	/* MQTT transport configuration */ 
    /* MODIFIED HERE */
    #if defined(CONFIG_MQTT_LIB_TLS)
       client->transport.type = MQTT_TRANSPORT_SECURE;
       client->transport.tls.config.peer_verify = 0;
       client->transport.tls.config.cipher_count = 0;
       client->transport.tls.config.cipher_list = NULL;
       client->transport.tls.config.sec_tag_count = 0;
       client->transport.tls.config.seg_tag_list = NULL;
       client->transport.tls.config.hostname = NULL;
    #else
       client->transport.type = MQTT_TRANSPORT_NON_SECURE;
    #endif
}