Hi Brenton,

Generally your approach is correct to set the username/password in the `client_init()` function of the sample, but please note that these fields are not plain C strings but rather `struct mqtt_utf8` pointers. So for instance for username you should create username struct (note the `size` parameter does count the NULL terminator) :

static struct mqtt_utf8 username = {

     .utf8 = "kapua-password",

     .size = sizeof("kapua-password") - 1

};

And then use it in the `client_init()`:

client->user_name = &username;

The same applies to the password field.

Regards,

Robert