samples: mqtt_publisher: wait for the ethernet device to come up

A workaround to allow the network device to come up and settle before
connecting the network.

Fixed a typo on the way and added a boot banner.

Change-Id: I8a8391261610dc00f5168e8abf167c8c65778eae
Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

samples/net/mqtt_publisher/Makefile

@@ -7,7 +7,7 @@
 BOARD ?= frdm_k64f
 CONF_FILE ?= prj_$(BOARD).conf
 
-include $(ZEPHYR_BASE)/Makefile.inc
+include $(ZEPHYR_BASE)/Makefile.test
 
 ifeq ($(BOARD), qemu_x86)
 	include $(ZEPHYR_BASE)/samples/net/common/Makefile.ipstack

samples/net/mqtt_publisher/README.rst

@@ -108,7 +108,7 @@ Open another terminal window and type:
 
 .. code-block:: console
 
-	mosquito_sub -t sensors
+	mosquitto_sub -t sensors
 
 Sample output
 =============

samples/net/mqtt_publisher/src/main.c

@@ -469,5 +469,7 @@ static int network_setup(struct net_context **net_ctx, const char *local_addr,
 
 void main(void)
 {
+	printk("Wait for network device to come up...\n");
+	k_sleep(K_SECONDS(6));
 	publisher();
 }