.. _using_the_lwm2m_carrier_library:

Using the carrier library
#########################

The application supports the |NCS| :ref:`liblwm2m_carrier_readme` library that you can use to connect to the operator's device management platform.
See the library's documentation for more information and configuration options.

To enable the LwM2M carrier library, add the parameter ``-DOVERLAY_CONFIG=overlay-carrier.conf`` to your build command.

The CA root certificates that are needed for modem FOTA are not provisioned in the Asset Tracker v2 application.
You can flash the :ref:`lwm2m_carrier` sample to write the certificates to modem before flashing the Asset Tracker v2 application, or use the :ref:`at_client_sample` sample as explained in :ref:`Preparing the nRF9160: LwM2M Client sample for production <lwm2m_client_provisioning>`.
It is also possible to modify the Asset Tracker v2 project itself to include the certificate provisioning, as demonstrated in the :ref:`lwm2m_carrier` sample.

.. code-block:: c

   int lwm2m_carrier_event_handler(const lwm2m_carrier_event_t *event)
   {
           switch (event->type) {
           case LWM2M_CARRIER_EVENT_INIT:
                   carrier_cert_provision();
           ...