Using MQTT helper library for TLS

[Marbro1965]

Hi,

in Cellular Iot Fundamentals there is in lesson 4 an exercise to move to MQTT with TLS.

As I used MQTT helper library, I wonder if it is enough to modify the structure

struct mqtt_helper_conn_params conn_params = {

.hostname = CONFIG_MQTT_BROKER_HOSTNAME,

.port = CONFIG_MQTT_BROKER_PORT,

.transport.type = MQTT_TRANSPORT_SECURE,

.transport.tls.sec_tag = CONFIG_MQTT_TLS_SEC_TAG,

.transport.tls.hostname = CONFIG_MQTT_BROKER_HOSTNAME,

.transport.tls.peer_verify = TLS_PEER_VERIFY_REQUIRED,

};

to have a secure connection , anyway providing certificate as described in the example.

Thanks in advance for reply 

Best Regards

[Håkon Alseth]

Hi,

.hostname = CONFIG_MQTT_BROKER_HOSTNAME,

.port = CONFIG_MQTT_BROKER_PORT,

.transport.type = MQTT_TRANSPORT_SECURE,

.transport.tls.sec_tag = CONFIG_MQTT_TLS_SEC_TAG,

.transport.tls.hostname = CONFIG_MQTT_BROKER_HOSTNAME,

.transport.tls.peer_verify = TLS_PEER_VERIFY_REQUIRED,

The struct "mqtt_helper_conn_params" does not hold those members. This is the way to do it if you use the mqtt library directly.

For the net/mqtt sample documentation, see here:

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/net/mqtt/doc/description.html

 

And the linked documentation for changing mqtt broker:

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/net/mqtt/doc/provisioning.html#mqtt-sample-provisioning

 

Kind regards,

Håkon

[Marbro1965]

Probably it is better if I change my code to the l4 example. The samples/net/mqtt is not so clear for me.

Please tell me , if I only publish and subscribe, is it necessary to call 

fds_init(&client,&fds);

Thanks

[Håkon Alseth]

Hi,

 

There's a bit more than that. You can have a peek at the solution if you want:

https://github.com/NordicDeveloperAcademy/cell-fund/blob/master/v2.6.2-v2.4.0/l4/l4_e2_sol/src/main.c

  

Kind regards,

Håkon

[Marbro1965]

Yes, it is perfect.

I am importing this code but why I cannot define

CONFIG_MQTT_BROKER_HOSTNAME in my prj file?

I am using actinius icarus board v2.

Thanks

[Håkon Alseth]

Hi,

 

If you share a log, it will be easier to understand what is happening. Can you share the full output?

 

Kind regards,

Håkon

[Marbro1965]

Hi.

Sorry, I am trying to import code of v2.8.x-v2.7.0\l4\l4_e2_sol example in a cpp project but it neds the

library for getaddrinfo, addrinfo,inet_ntop,freeaddrinfo.

I have include the headers 

#include <zephyr/kernel.h>

#include <zephyr/net/socket.h>

#include <zephyr/net/mqtt.h>

like in the example but it looks like they are not declared in this header. So I wonder if they are implicitly

loaded somewhere else.
If I do not get compiled I cannot solve the problem of missing config.

Thanks. Regards.

[Håkon Alseth]

Hi,

 

Please share your error output.

the bsd socket interface shall be included with this:

Marbro1965 said:

#include <zephyr/net/socket.h>

including getaddrinfo().

 

Kind regards,

Håkon

[Marbro1965]

Sorry, I have a lot of red squiggles. But In effect the program compiles.
Thanks very much.

Really I am getting crazy with this red squiggles.