net: samples: Add socket based SNTP client application

SNTP client sample requests time sync on IPv4 and IPv6 addresses
using socket based SNTP client library.

Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@linux.intel.com>

samples/net/sockets/sntp_client/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.13.1)
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(sntp_client)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

samples/net/sockets/sntp_client/README.rst

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+.. _sntp-client-sample:
+
+SNTP client sample
+##################
+
+Overview
+********
+
+This sample is a simple SNTP client showing how to retrieve the current
+time in seconds since 1st January 1970.
+
+This demo assumes that the platform of choice has networking support,
+some adjustments to the configuration may be needed. It also assumes
+SNTP server is running on the host.
+
+Building and Running
+********************
+
+When the application runs, it issues an SNTP request to the host and waits
+for a response. When the response is received, the current epoch time, in
+seconds, as well as the status code of the response (0 on success), is
+printed.
+
+See the `net-tools`_ project for more details.
+
+This sample can be built and executed on QEMU as described
+in :ref:`networking_with_qemu`.
+
+.. _`net-tools`: https://github.com/zephyrproject-rtos/net-tools

samples/net/sockets/sntp_client/prj.conf

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+# 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
+
+# Sockets
+CONFIG_NET_SOCKETS=y
+CONFIG_NET_SOCKETS_POSIX_NAMES=y
+CONFIG_NET_SOCKETS_POLL_MAX=4
+
+# Network driver config
+CONFIG_TEST_RANDOM_GENERATOR=y
+
+# Network address config
+CONFIG_NET_CONFIG_SETTINGS=y
+CONFIG_NET_CONFIG_NEED_IPV4=y
+CONFIG_NET_CONFIG_NEED_IPV6=y
+CONFIG_NET_CONFIG_MY_IPV4_ADDR="192.0.2.1"
+CONFIG_NET_CONFIG_PEER_IPV4_ADDR="192.0.2.2"
+CONFIG_NET_CONFIG_MY_IPV6_ADDR="2001:db8::1"
+CONFIG_NET_CONFIG_PEER_IPV6_ADDR="2001:db8::2"
+
+# SNTP
+CONFIG_SNTP=y
+
+CONFIG_MAIN_STACK_SIZE=2048
+# Network debug config
+CONFIG_NET_LOG=y
+CONFIG_LOG=y
+CONFIG_NET_SOCKETS_LOG_LEVEL_DBG=n
+CONFIG_SNTP_LOG_LEVEL_DBG=n

samples/net/sockets/sntp_client/sample.yaml

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+sample:
+  description: SNTP client sample
+  name: sntp_client
+tests:
+  test:
+    harness: net
+    platform_whitelist: qemu_x86
+    tags: net

samples/net/sockets/sntp_client/src/main.c

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+/*
+ * Copyright (c) 2017 Linaro Limited
+ * Copyright (c) 2019 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <logging/log.h>
+LOG_MODULE_REGISTER(net_sntp_client_sample, LOG_LEVEL_DBG);
+
+#include <net/sntp.h>
+
+#define SNTP_PORT 123
+
+void resp_callback(struct sntp_ctx *ctx, int status,
+		   u64_t epoch_time)
+{
+	LOG_DBG("time: %lld", epoch_time);
+	LOG_DBG("status: %d", status);
+}
+
+void main(void)
+{
+	struct sntp_ctx ctx;
+	struct sockaddr_in addr;
+	struct sockaddr_in6 addr6;
+	int rv;
+
+	/* ipv4 */
+	memset(&addr, 0, sizeof(addr));
+	addr.sin_family = AF_INET;
+	addr.sin_port = htons(SNTP_PORT);
+	inet_pton(AF_INET, CONFIG_NET_CONFIG_PEER_IPV4_ADDR,
+		  &addr.sin_addr);
+
+	rv = sntp_init(&ctx, (struct sockaddr *) &addr,
+		       sizeof(struct sockaddr_in));
+	if (rv < 0) {
+		LOG_ERR("Failed to init sntp ctx: %d", rv);
+		goto end;
+	}
+
+	rv = sntp_request(&ctx, K_FOREVER, resp_callback);
+	if (rv < 0) {
+		LOG_ERR("Failed to send sntp request: %d", rv);
+		goto end;
+	}
+
+	sntp_close(&ctx);
+
+	/* ipv6 */
+	memset(&addr6, 0, sizeof(addr6));
+	addr6.sin6_family = AF_INET6;
+	addr6.sin6_port = htons(SNTP_PORT);
+	inet_pton(AF_INET6, CONFIG_NET_CONFIG_PEER_IPV6_ADDR,
+		  &addr6.sin6_addr);
+
+	rv = sntp_init(&ctx, (struct sockaddr *) &addr6,
+		       sizeof(struct sockaddr_in6));
+	if (rv < 0) {
+		LOG_ERR("Failed to init sntp ctx: %d", rv);
+		goto end;
+	}
+
+	rv = sntp_request(&ctx, K_NO_WAIT, resp_callback);
+	if (rv < 0) {
+		LOG_ERR("Failed to send sntp request: %d", rv);
+		goto end;
+	}
+
+end:
+	sntp_close(&ctx);
+}