Revert "Stop publish examples to mongoose repo"

This reverts commit 1a17e17c462bdd4e1d26d8742f8b7087273e04c2.

PUBLISHED_FROM=80028de308c9a021955d1425d2bfee8feb85f193

examples/coap_client/Makefile

@@ -0,0 +1,3 @@
+PROG = coap_client
+MODULE_CFLAGS = -DMG_ENABLE_COAP
+include ../examples.mk

examples/coap_client/coap_client.c

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2015 Cesanta Software Limited
+ * All rights reserved
+ *
+ * This program sends CoAP CON-message to server (coap.me by default)
+ * and waits for answer.
+ */
+
+#include "mongoose.h"
+
+static int s_time_to_exit = 0;
+static char *s_default_address = "udp://coap.me:5683";
+
+static void coap_handler(struct mg_connection *nc, int ev, void *p) {
+  switch (ev) {
+    case MG_EV_CONNECT: {
+      struct mg_coap_message cm;
+      uint32_t res;
+
+      memset(&cm, 0, sizeof(cm));
+      cm.msg_id = 1;
+      cm.msg_type = MG_COAP_MSG_CON;
+      printf("Sending CON...\n");
+      res = mg_coap_send_message(nc, &cm);
+      if (res == 0) {
+        printf("Sent CON with msg_id = %d\n", cm.msg_id);
+      } else {
+        printf("Error: %d\n", res);
+        s_time_to_exit = 1;
+      }
+      break;
+    }
+    case MG_EV_COAP_ACK:
+    case MG_EV_COAP_RST: {
+      struct mg_coap_message *cm = (struct mg_coap_message *) p;
+      printf("ACK/RST for message with msg_id = %d received\n", cm->msg_id);
+      nc->flags |= MG_F_SEND_AND_CLOSE;
+      s_time_to_exit = 1;
+      break;
+    }
+    case MG_EV_CLOSE: {
+      if (s_time_to_exit == 0) {
+        printf("Server closed connection\n");
+        s_time_to_exit = 1;
+      }
+      break;
+    }
+  }
+}
+
+int main(int argc, char *argv[]) {
+  struct mg_mgr mgr;
+  struct mg_connection *nc;
+  char *address = s_default_address;
+
+  if (argc > 1) {
+    address = argv[1];
+  }
+
+  printf("Using %s as CoAP server\n", address);
+
+  mg_mgr_init(&mgr, 0);
+
+  nc = mg_connect(&mgr, address, coap_handler);
+  if (nc == NULL) {
+    printf("Unable to connect to %s\n", address);
+    return -1;
+  }
+
+  mg_set_protocol_coap(nc);
+
+  while (!s_time_to_exit) {
+    mg_mgr_poll(&mgr, 1000000);
+  }
+
+  mg_mgr_free(&mgr);
+
+  return 0;
+}