examples/sock_tcp_echo_client: add TCP echo client

examples/sock_tcp_echo_client/Makefile

@@ -0,0 +1,33 @@
+# name of your application
+APPLICATION = tcp_echo_client
+
+# If no BOARD is found in the environment, use this default:
+BOARD ?= native
+
+# default to using GNRC
+LWIP ?= 0
+
+# This has to be the absolute path to the RIOT base directory:
+RIOTBASE ?= $(CURDIR)/../..
+
+USEMODULE += sock_tcp
+USEMODULE += netdev_default
+
+USEMODULE += shell
+USEMODULE += netutils
+
+ifeq (1, $(LWIP))
+  USEMODULE += ipv6_addr
+  USEMODULE += lwip_ipv6_autoconfig
+  USEMODULE += lwip_netdev
+else
+  USEMODULE += auto_init_gnrc_netif
+  USEMODULE += gnrc_ipv6
+endif
+
+# Comment this out to disable code in RIOT that does safety checking
+# which is not needed in a production environment but helps in the
+# development process:
+DEVELHELP ?= 1
+
+include $(RIOTBASE)/Makefile.include

examples/sock_tcp_echo_client/Makefile.ci

@@ -0,0 +1,31 @@
+BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-leonardo \
+    arduino-mega2560 \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
+    atmega328p-xplained-mini \
+    atxmega-a1u-xpro \
+    bluepill-stm32f030c8 \
+    i-nucleo-lrwan1 \
+    msb-430 \
+    msb-430h \
+    nucleo-f030r8 \
+    nucleo-f031k6 \
+    nucleo-f042k6 \
+    nucleo-f303k8 \
+    nucleo-f334r8 \
+    nucleo-l011k4 \
+    nucleo-l031k6 \
+    nucleo-l053r8 \
+    samd10-xmini \
+    slstk3400a \
+    stk3200 \
+    stm32f030f4-demo \
+    stm32f0discovery \
+    stm32l0538-disco \
+    telosb \
+    waspmote-pro \
+    z1 \
+    #

examples/sock_tcp_echo_client/main.c

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2016 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @{
+ *
+ * @file
+ * @author  Martine Lenders <[email protected]>
+ * @author  Benjamin Valentin <[email protected]>
+ */
+
+#include <stdio.h>
+
+#include "net/sock/tcp.h"
+#include "net/ipv6/addr.h"
+#include "net/utils.h"
+#include "shell.h"
+
+static int _cmd_tcp_send(int argc, char **argv)
+{
+    int res;
+    sock_tcp_t sock;
+    sock_tcp_ep_t remote;
+    netif_t *netif;
+    uint8_t buf[128];
+
+    if (argc < 4) {
+        printf("usage: %s <addr> <port> <data>\n", argv[0]);
+        return -1;
+    }
+
+    if (netutils_get_ipv6((ipv6_addr_t *)&remote.addr,
+                          &netif, argv[1]) < 0) {
+        printf("can't resolve %s\n", argv[1]);
+        return -1;
+    }
+
+    remote.family = AF_INET6;
+    remote.netif  = netif ? netif_get_id(netif) : 0;
+    remote.port   = atoi(argv[2]);
+
+    if ((res = sock_tcp_connect(&sock, &remote, 0, 0)) < 0) {
+        printf("Error connecting sock: %s\n", strerror(-res));
+        return -1;
+    }
+
+    if ((res = sock_tcp_write(&sock, argv[3], strlen(argv[3]))) < 0) {
+        printf("Errored on write: %s\n", strerror(-res));
+    }
+    else {
+        if ((res = sock_tcp_read(&sock, &buf, sizeof(buf),
+                                 SOCK_NO_TIMEOUT)) <= 0) {
+            puts("Disconnected");
+        }
+        printf("Read: \"");
+        for (int i = 0; i < res; i++) {
+            printf("%c", buf[i]);
+        }
+        puts("\"");
+    }
+    sock_tcp_disconnect(&sock);
+
+    return 0;
+}
+
+static const shell_command_t shell_commands[] = {
+    { "send", "send data over TCP", _cmd_tcp_send },
+    { NULL, NULL, NULL }
+};
+
+int main(void)
+{
+    puts("RIOT TCP client example application");
+
+    /* start shell */
+    puts("All up, running the shell now");
+    char line_buf[SHELL_DEFAULT_BUFSIZE];
+    shell_run(shell_commands, line_buf, SHELL_DEFAULT_BUFSIZE);
+
+    /* should be never reached */
+    return 0;
+}
+/** @} */