samples: subsys: lorawan: class_a: add multicast support

This is mainly to make sure that the multicast code is built in CI.

Signed-off-by: Martin Jäger <martin@libre.solar>

samples/subsys/lorawan/class_a/README.rst

@@ -30,7 +30,8 @@ Extended Configuration
 **********************
 
 This sample can be configured to run the application-layer clock
-synchronization service in the background.
+synchronization service and/or the remote multicast setup service
+in the background.
 
 The following commands build and flash the sample with clock synchronization
 enabled.
@@ -41,3 +42,13 @@ enabled.
    :goals: build flash
    :gen-args: -DEXTRA_CONF_FILE=overlay-clock-sync.conf
    :compact:
+
+The following commands build and flash the sample with remote multicast setup
+enabled.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/subsys/lorawan/class_a
+   :board: nucleo_wl55jc
+   :goals: build flash
+   :gen-args: -DEXTRA_CONF_FILE=overlay-multicast.conf
+   :compact:

samples/subsys/lorawan/class_a/overlay-multicast.conf

@@ -0,0 +1,9 @@
+# NVS required to store LoRaWAN DevNonce and multicast sessions
+CONFIG_NVS=y
+CONFIG_SETTINGS=y
+CONFIG_LORAWAN_NVM_SETTINGS=y
+
+CONFIG_LORAWAN_SERVICES=y
+CONFIG_LORAWAN_SERVICES_LOG_LEVEL_DBG=y
+CONFIG_LORAWAN_APP_CLOCK_SYNC=y
+CONFIG_LORAWAN_REMOTE_MULTICAST=y

samples/subsys/lorawan/class_a/sample.yaml

@@ -49,3 +49,8 @@ tests:
     filter: CONFIG_ENTROPY_HAS_DRIVER
     integration_platforms:
       - nucleo_wl55jc
+  sample.lorawan.class_a.multicast:
+    extra_args: OVERLAY_CONFIG="overlay-multicast.conf"
+    filter: CONFIG_ENTROPY_HAS_DRIVER
+    integration_platforms:
+      - nucleo_wl55jc