samples: net: download: add graceful iface down

Add graceful bring down of the network interfaces.

Signed-off-by: Mirko Covizzi <[email protected]>

doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst

@@ -450,6 +450,10 @@ Networking samples
 
   * Updated the sample to gracefully bring down the network interfaces.
 
+* :ref:`download_sample` sample:
+
+  * Updated the sample to gracefully bring down the network interfaces.
+
 NFC samples
 -----------
 

samples/net/download/src/main.c

@@ -221,6 +221,7 @@ static int callback(const struct download_client_evt *event)
 #endif /* CONFIG_SAMPLE_COMPUTE_HASH */
 
 		(void)conn_mgr_if_disconnect(net_if);
+		(void)conn_mgr_all_if_down(true);
 		printk("Bye\n");
 		return 0;
 
@@ -230,6 +231,7 @@ static int callback(const struct download_client_evt *event)
 			/* With ECONNRESET, allow library to attempt a reconnect by returning 0 */
 		} else {
 			(void)conn_mgr_if_disconnect(net_if);
+			(void)conn_mgr_all_if_down(true);
 			/* Stop download */
 			return -1;
 		}