samples: cellular: nrf_cloud_multi_service: increase FMFU heap

Increased the value CONFIG_HEAP_MEM_POOL_SIZE in the full modem FOTA overlay to prevent a boot loop on full modem image installation. IRIS-7377 Signed-off-by: Justin Morton <justin.morton@nordicsemi.no>
D-Triveni · Oct 19, 2023 · e86892e · e86892e
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diff --git a/doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst b/doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst
@@ -452,6 +452,7 @@ Cellular samples (renamed from nRF9160 samples)
   * Fixed:
 
     * Legitimate server side CoAP API errors are not counted now as a reason to disconnect from and reconnect to the cloud, but only communications errors.
+    * Increased the value of :kconfig:option:`CONFIG_HEAP_MEM_POOL_SIZE` in the full modem FOTA overlay to prevent a boot loop on full modem image installation.
 
   * Removed the Kconfig options :kconfig:option:`CONFIG_LTE_INIT_RETRY_TIMEOUT_SECONDS` and :kconfig:option:`CLOUD_CONNECTION_REESTABLISH_DELAY_SECONDS` as they are no longer needed.
 

diff --git a/samples/cellular/nrf_cloud_multi_service/overlay_full_modem_fota.conf b/samples/cellular/nrf_cloud_multi_service/overlay_full_modem_fota.conf
@@ -14,3 +14,6 @@ CONFIG_DFU_TARGET_FULL_MODEM_USE_EXT_PARTITION=y
 CONFIG_PM_OVERRIDE_EXTERNAL_DRIVER_CHECK=y
 CONFIG_PM_EXTERNAL_FLASH_MCUBOOT_SECONDARY=n
 CONFIG_PM_SINGLE_IMAGE=y
+# FMFU requires additional heap space.
+# If the heap is too small, a boot loop can occur when the full modem image is installed.
+CONFIG_HEAP_MEM_POOL_SIZE=47250