Merge pull request #4287 from kaspar030/add_conn_coap_example

examples: add microcoap, gnrc, conn example

examples/microcoap_server/Makefile

+# name of your application
+APPLICATION = microcoap_server
+
+# If no BOARD is found in the environment, use this default:
+BOARD ?= native
+
+# This has to be the absolute path to the RIOT base directory:
+RIOTBASE ?= $(CURDIR)/../..
+
+BOARD_INSUFFICIENT_MEMORY := airfy-beacon chronos msb-430 msb-430h nrf51dongle \
+                          nrf6310 pca10000 pca10005 spark-core \
+                          stm32f0discovery telosb weio wsn430-v1_3b wsn430-v1_4 \
+                          yunjia-nrf51822 z1
+
+# Include packages that pull up and auto-init the link layer.
+# NOTE: 6LoWPAN will be included if IEEE802.15.4 devices are present
+USEMODULE += gnrc_netif_default
+USEMODULE += auto_init_gnrc_netif
+# Specify the mandatory networking modules for IPv6 and UDP
+USEMODULE += gnrc_ipv6_router_default
+USEMODULE += gnrc_udp
+# Add a routing protocol
+USEMODULE += gnrc_rpl
+# Additional networking modules that can be dropped if not needed
+USEMODULE += gnrc_icmpv6_echo
+
+#
+USEMODULE += gnrc_conn_udp
+
+USEPKG += microcoap
+CFLAGS += -DMICROCOAP_DEBUG
+
+# include this for printing IP addresses
+USEMODULE += shell_commands
+
+# Comment this out to disable code in RIOT that does safety checking
+# which is not needed in a production environment but helps in the
+# development process:
+#CFLAGS += -DDEVELHELP
+
+# Use different settings when compiling for one of the following (low-memory)
+# boards
+LOW_MEMORY_BOARDS := nucleo-f334
+
+ifneq (,$(filter $(BOARD),$(LOW_MEMORY_BOARDS)))
+$(info Using low-memory configuration for microcoap_server.)
+## low-memory tuning values
+# lower pktbuf buffer size
+CFLAGS += -DGNRC_PKTBUF_SIZE=1000
+# disable fib, rpl
+DISABLE_MODULE += fib gnrc_rpl
+USEMODULE += prng_minstd
+endif
+
+# Change this to 0 show compiler invocation lines by default:
+QUIET ?= 1
+
+include $(RIOTBASE)/Makefile.include

examples/microcoap_server/README.md

+microcoap server example
+========================
+
+This application is meant to get you started with impementing a CoAP server on RIOT.
+It uses the gnrc network stack through RIOT's conn socket API.
+
+
+Usage
+=====
+
+To try on native, compile with
+
+```
+# make all
+```
+
+Then run the resulting binary, e.g.,
+
+```
+# make term
+```
+
+The application is now listening on all it's configured IP addresses.
+
+Now find out it's link\_layer address:
+
+
+```
+$ make term
+/home/kaspar/src/riot/examples/microcoap_server/bin/native/microcoap_server.elf tap0
+RIOT native interrupts/signals initialized.
+LED_GREEN_OFF
+LED_RED_ON
+RIOT native board initialized.
+RIOT native hardware initialization complete.
+
+main(): This is RIOT! (Version: 2015.12-devel-632-g8f451-booze-add_conn_coap_example)
+RIOT microcoap example application
+Configured network interfaces:
+Iface  5   HWaddr: fa:bf:2b:01:9e:a3
+           MTU:1280  HL:64
+           Source address length: 6
+           Link type: wired
+           inet6 addr: ff02::1/128  scope: local [multicast]
+           inet6 addr: fe80::f8bf:2bff:fe01:9ea3/64  scope: local
+           inet6 addr: ff02::1:ff01:9ea3/128  scope: local [multicast]
+           inet6 addr: ff02::2/128  scope: local [multicast]
+
+Waiting for incoming UDP packet...
+```
+
+The link-layer address in this case is "fe80::f8bf:2bff:fe01:9ea3", the only
+"scope: local" address set.
+
+Connect using libcoap CLI
+=========================
+
+(replace "fe80::f8bf:2bff:fe01:9ea3" with your link-layer address)
+
+```
+# coap-client coap://[fe80::f8bf:2bff:fe01:9ea3%tap0]/riot/board
+```

examples/microcoap_server/coap.c

+/*
+ * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ *
+ * 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.
+ */
+
+#include <coap.h>
+#include <string.h>
+
+#define MAX_RESPONSE_LEN 500
+static uint8_t response[MAX_RESPONSE_LEN] = { 0 };
+
+static int handle_get_well_known_core(coap_rw_buffer_t *scratch,
+                                      const coap_packet_t *inpkt,
+                                      coap_packet_t *outpkt,
+                                      uint8_t id_hi, uint8_t id_lo);
+
+static int handle_get_riot_board(coap_rw_buffer_t *scratch,
+                                 const coap_packet_t *inpkt,
+                                 coap_packet_t *outpkt,
+                                 uint8_t id_hi, uint8_t id_lo);
+
+static const coap_endpoint_path_t path_well_known_core =
+        { 2, { ".well-known", "core" } };
+
+static const coap_endpoint_path_t path_riot_board =
+        { 2, { "riot", "board" } };
+
+const coap_endpoint_t endpoints[] =
+{
+    { COAP_METHOD_GET,	handle_get_well_known_core,
+        &path_well_known_core, "ct=40" },
+    { COAP_METHOD_GET,	handle_get_riot_board,
+        &path_riot_board,	   "ct=0"  },
+    /* marks the end of the endpoints array: */
+    { (coap_method_t)0, NULL, NULL, NULL }
+};
+
+static int handle_get_well_known_core(coap_rw_buffer_t *scratch,
+        const coap_packet_t *inpkt, coap_packet_t *outpkt,
+        uint8_t id_hi, uint8_t id_lo)
+{
+    char *rsp = (char *)response;
+    int len = sizeof(response);
+    const coap_endpoint_t *ep = endpoints;
+    int i;
+
+    len--; // Null-terminated string
+
+    while (NULL != ep->handler) {
+        if (NULL == ep->core_attr) {
+            ep++;
+            continue;
+        }
+
+        if (0 < strlen(rsp)) {
+            strncat(rsp, ",", len);
+            len--;
+        }
+
+        strncat(rsp, "<", len);
+        len--;
+
+        for (i = 0; i < ep->path->count; i++) {
+            strncat(rsp, "/", len);
+            len--;
+
+            strncat(rsp, ep->path->elems[i], len);
+            len -= strlen(ep->path->elems[i]);
+        }
+
+        strncat(rsp, ">;", len);
+        len -= 2;
+
+        strncat(rsp, ep->core_attr, len);
+        len -= strlen(ep->core_attr);
+
+        ep++;
+    }
+
+    return coap_make_response(scratch, outpkt, (const uint8_t *)rsp,
+                              strlen(rsp), id_hi, id_lo, &inpkt->tok,
+                              COAP_RSPCODE_CONTENT,
+                              COAP_CONTENTTYPE_APPLICATION_LINKFORMAT);
+}
+
+static int handle_get_riot_board(coap_rw_buffer_t *scratch,
+        const coap_packet_t *inpkt, coap_packet_t *outpkt,
+        uint8_t id_hi, uint8_t id_lo)
+{
+    const char *riot_name = RIOT_BOARD;
+    int len = strlen(RIOT_BOARD);
+
+    memcpy(response, riot_name, len);
+
+    return coap_make_response(scratch, outpkt, (const uint8_t *)response, len,
+                              id_hi, id_lo, &inpkt->tok, COAP_RSPCODE_CONTENT,
+                              COAP_CONTENTTYPE_TEXT_PLAIN);
+}

examples/microcoap_server/main.c

+/*
+ * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ *
+ * 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.
+ */
+
+/**
+ * @ingroup     examples
+ * @{
+ *
+ * @file
+ * @brief       CoAP example server application (using microcoap)
+ *
+ * @author      Kaspar Schleiser <kaspar@schleiser.de>
+ * @}
+ */
+
+#include <stdio.h>
+#include "msg.h"
+
+#define MAIN_QUEUE_SIZE     (8)
+static msg_t _main_msg_queue[MAIN_QUEUE_SIZE];
+
+void microcoap_server_loop(void);
+
+/* import "ifconfig" shell command, used for printing addresses */
+extern int _netif_config(int argc, char **argv);
+
+int main(void)
+{
+    puts("RIOT microcoap example application");
+
+    /* microcoap_server uses conn which uses gnrc which needs a msg queue */
+    msg_init_queue(_main_msg_queue, MAIN_QUEUE_SIZE);
+
+    /* print network addresses */
+    puts("Configured network interfaces:");
+    _netif_config(0, NULL);
+
+    /* start coap server loop */
+    microcoap_server_loop();
+
+    /* should be never reached */
+    return 0;
+}

examples/microcoap_server/microcoap_conn.c

+/*
+ * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ *
+ * 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.
+ */
+
+#include "net/af.h"
+#include "net/conn/udp.h"
+
+#ifdef MICROCOAP_DEBUG
+#define ENABLE_DEBUG (1)
+#else
+#define ENABLE_DEBUG (0)
+#endif
+#include "debug.h"
+
+#include "coap.h"
+
+static uint8_t _udp_buf[512];   /* udp read buffer (max udp payload size) */
+uint8_t scratch_raw[1024];      /* microcoap scratch buffer */
+
+coap_rw_buffer_t scratch_buf = { scratch_raw, sizeof(scratch_raw) };
+
+#define COAP_SERVER_PORT    (5683)
+
+/*
+ * Starts a blocking and never-returning loop dispatching CoAP requests.
+ *
+ * When using gnrc, make sure the calling thread has an initialized msg queue.
+ */
+void microcoap_server_loop(void)
+{
+
+    uint8_t laddr[16] = { 0 };
+    uint8_t raddr[16] = { 0 };
+    size_t raddr_len;
+    uint16_t rport;
+
+    conn_udp_t conn;
+
+    int rc = conn_udp_create(&conn, laddr, sizeof(laddr), AF_INET6, COAP_SERVER_PORT);
+
+    while (1) {
+        DEBUG("Waiting for incoming UDP packet...\n");
+        rc = conn_udp_recvfrom(&conn, (char *)_udp_buf, sizeof(_udp_buf), raddr, &raddr_len, &rport);
+        if (rc < 0) {
+            DEBUG("Error in conn_udp_recvfrom(). rc=%u\n", rc);
+            continue;
+        }
+
+        size_t n = rc;
+
+        coap_packet_t pkt;
+        DEBUG("Received packet: ");
+        coap_dump(_udp_buf, n, true);
+        DEBUG("\n");
+
+        /* parse UDP packet to CoAP */
+        if (0 != (rc = coap_parse(&pkt, _udp_buf, n))) {
+            DEBUG("Bad packet rc=%d\n", rc);
+        }
+        else {
+            coap_packet_t rsppkt;
+            DEBUG("content:\n");
+            coap_dumpPacket(&pkt);
+
+            /* handle CoAP request */
+            coap_handle_req(&scratch_buf, &pkt, &rsppkt);
+
+            /* build reply */
+            size_t rsplen = sizeof(_udp_buf);
+            if ((rc = coap_build(_udp_buf, &rsplen, &rsppkt)) != 0) {
+                DEBUG("coap_build failed rc=%d\n", rc);
+            }
+            else {
+                DEBUG("Sending packet: ");
+                coap_dump(_udp_buf, rsplen, true);
+                DEBUG("\n");
+                DEBUG("content:\n");
+                coap_dumpPacket(&rsppkt);
+
+                /* send reply via UDP */
+                rc = conn_udp_sendto(_udp_buf, rsplen, NULL, 0, raddr, raddr_len, AF_INET6, COAP_SERVER_PORT, rport);
+                if (rc < 0) {
+                    DEBUG("Error sending CoAP reply via udp; %u\n", rc);
+                }
+            }
+        }
+    }
+}