net: sample: Add sntp client sample

This sample demostrates how to use SNTP client library to get the
current time from SNTP/NTP server.

Signed-off-by: Aska Wu <aska.wu@linaro.org>

samples/net/sntp_client/Makefile

@@ -0,0 +1,11 @@
+# Copyright (c) 2017 Linaro Limited
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+BOARD ?= qemu_x86
+CONF_FILE ?= prj.conf
+
+include $(ZEPHYR_BASE)/Makefile.inc
+
+include $(ZEPHYR_BASE)/samples/net/common/Makefile.ipstack

samples/net/sntp_client/prj.conf

@@ -0,0 +1,28 @@
+# General config
+CONFIG_NEWLIB_LIBC=y
+
+# Networking config
+CONFIG_NETWORKING=y
+CONFIG_NET_IPV4=y
+CONFIG_NET_IPV6=y
+CONFIG_NET_UDP=y
+CONFIG_NET_SHELL=y
+
+# Network driver config
+CONFIG_TEST_RANDOM_GENERATOR=y
+
+# Network address config
+CONFIG_NET_APP_SETTINGS=y
+CONFIG_NET_APP_NEED_IPV4=y
+CONFIG_NET_APP_NEED_IPV6=y
+CONFIG_NET_APP_MY_IPV4_ADDR="192.0.2.1"
+CONFIG_NET_APP_PEER_IPV4_ADDR="192.0.2.2"
+CONFIG_NET_APP_MY_IPV6_ADDR="2001:db8::1"
+CONFIG_NET_APP_PEER_IPV6_ADDR="2001:db8::2"
+
+# Network debug config
+CONFIG_NET_LOG=y
+
+# SNTP
+CONFIG_SNTP=y
+CONFIG_NET_DEBUG_SNTP=y

samples/net/sntp_client/sample.yaml

@@ -0,0 +1,8 @@
+sample:
+    description: SNTP client sample
+    name: sntp_client
+tests:
+-   test:
+        build_only: true
+        platform_whitelist: qemu_x86
+        tags: net

samples/net/sntp_client/src/Makefile

@@ -0,0 +1,6 @@
+# Copyright (c) 2017 Linaro Limited
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+obj-y += main.o

samples/net/sntp_client/src/main.c

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2017 Linaro Limited
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <misc/printk.h>
+#include <net/sntp.h>
+
+#define SNTP_PORT 123
+
+struct k_sem sem;
+
+void resp_callback(struct sntp_ctx *ctx,
+		   int status,
+		   u64_t epoch_time,
+		   void *user_data)
+{
+	printk("time: %lld\n", epoch_time);
+	printk("status: %d\n", status);
+	printk("user_data: %p\n", user_data);
+
+	k_sem_give(&sem);
+}
+
+void main(void)
+{
+	struct sntp_ctx ctx;
+	int rv;
+
+	k_sem_init(&sem, 0, 1);
+
+	/* ipv4 */
+	rv = sntp_init(&ctx,
+		       CONFIG_NET_APP_PEER_IPV4_ADDR,
+		       SNTP_PORT,
+		       K_FOREVER);
+	if (rv < 0) {
+		printk("Failed to init sntp ctx: %d\n", rv);
+		return;
+	}
+
+	rv = sntp_request(&ctx, K_FOREVER, resp_callback, NULL);
+	if (rv < 0) {
+		printk("Failed to send sntp request: %d\n", rv);
+		return;
+	}
+
+	k_sem_take(&sem, K_FOREVER);
+	sntp_close(&ctx);
+
+	/* ipv6 */
+	rv = sntp_init(&ctx,
+		       CONFIG_NET_APP_PEER_IPV6_ADDR,
+		       SNTP_PORT,
+		       K_NO_WAIT);
+	if (rv < 0) {
+		printk("Failed to initi sntp ctx: %d\n", rv);
+		return;
+	}
+
+	rv = sntp_request(&ctx, K_NO_WAIT, resp_callback, NULL);
+	if (rv < 0) {
+		printk("Failed to send sntp request: %d\n", rv);
+		return;
+	}
+
+	k_sem_take(&sem, K_FOREVER);
+	sntp_close(&ctx);
+}