samples: mqtt_sn_publisher: fix adding predefined gateway

Apparently, the code was copied from where the broadcast IP is parsed and
not adjusted correctly. Both the log message and the source of the IP
address were wrong.

Signed-off-by: Michael Zimmermann <[email protected]>

Author: M1cha

samples/net/mqtt_sn_publisher/src/udp.c

@@ -149,13 +149,13 @@ static void process_thread(void)
 		LOG_INF("Adding predefined Gateway");
 		struct sockaddr_in gwaddr = {0};
 
-		LOG_DBG("Parsing Broadcast IP %s", SAMPLE_GW_IP);
+		LOG_DBG("Parsing Gateway IP %s", SAMPLE_GW_IP);
 		gwaddr.sin_family = AF_INET;
 		gwaddr.sin_port = htons(CONFIG_NET_SAMPLE_MQTT_SN_GATEWAY_PORT);
 		err = zsock_inet_pton(AF_INET, SAMPLE_GW_IP, &gwaddr.sin_addr);
 		__ASSERT(err == 1, "inet_pton() failed %d", err);
-		struct mqtt_sn_data gwaddr_data = {.data = (uint8_t *)&bcaddr,
-						   .size = sizeof(struct sockaddr)};
+		struct mqtt_sn_data gwaddr_data = {.data = (uint8_t *)&gwaddr,
+						   .size = sizeof(gwaddr)};
 
 		err = mqtt_sn_add_gw(&mqtt_client, 0x1f, gwaddr_data);
 		__ASSERT(err == 0, "mqtt_sn_add_gw() failed %d", err);