nrf52dk: added examples

examples/nrf52dk/blink-hello/Makefile

@@ -0,0 +1,9 @@
+CONTIKI_PROJECT = blink-hello
+
+CONTIKI_WITH_RPL=0
+NRF52_WITHOUT_SOFTDEVICE=1
+
+all: $(CONTIKI_PROJECT) 
+
+CONTIKI = ../../..
+include $(CONTIKI)/Makefile.include

examples/nrf52dk/blink-hello/README.md

@@ -0,0 +1,14 @@
+Blink Hello example
+===================
+This example shows basic usage of DK's buttons and LEDs. It also shows basic 
+usage of Contiki's processes. The application autostarts 5 processes: 4 processes
+for button and LED control and 1 to display current temperature to the console.
+
+A process reacts to a press of a respective button (process 1 reacts to button 1, etc.)
+and doubles the current blinking frequency. The cycle restarts for beginning when blinking
+frequency is greater than 8Hz.  
+
+The example requires one DK and it doesn't use SoftDevice. To compile and flash the
+example run:
+
+	make TARGET=nrf52dk blink-hello.flash

examples/nrf52dk/blink-hello/blink-hello.c

@@ -0,0 +1,182 @@
+/* This is a very simple hello_world program.
+ * It aims to demonstrate the co-existence of two processes:
+ * One of them prints a hello world message and the other blinks the LEDs
+ *
+ * It is largely based on hello_world in $(CONTIKI)/examples/sensinode
+ *
+ * Author: George Oikonomou - <oikonomou@users.sourceforge.net>
+ */
+
+/**
+ * \addtogroup nrf52dk nRF52 Development Kit
+ * @{
+ *
+ * \addtogroup nrf52dk-examples Demo projects for nRF52 DK
+ * @{
+ *
+ * \defgroup nrf52dk-blink-hello Basic sensors and LEDs demo
+ * @{
+ *
+ * This demo demonstrates use of Contiki processes, sensors, and LEDs
+ * on nRF52 DK. Pressing a button will start a timer that blinks a
+ * respective LED (e.g., button 1 controls LED 1). Each time the button
+ * is pressed blinking frequency is doubled. On 4th press the LED is
+ * switched off and the sequence can be started from the beginning.
+ *
+ * \file Main file for Basic sensors and LEDs demo.
+ */
+#include <stdio.h> /* For printf() */
+#include <inttypes.h>
+#include "contiki.h"
+#include "dev/leds.h"
+#include "dev/temperature-sensor.h"
+#include "lib/sensors.h"
+#include "button-sensor.h"
+
+/*---------------------------------------------------------------------------*/
+PROCESS(blink_process_1, "LED1 blink process");
+PROCESS(blink_process_2, "LED2 blink process");
+PROCESS(blink_process_3, "LED3 blink process");
+PROCESS(blink_process_4, "LED4 blink process");
+PROCESS(temp, "Temperautre");
+
+AUTOSTART_PROCESSES(
+    &blink_process_1,
+    &blink_process_2,
+    &blink_process_3,
+    &blink_process_4,
+    &temp
+);
+
+struct blink_process_ctx {
+  struct etimer et_blink;
+  unsigned char c;
+  const struct sensors_sensor *button;
+  unsigned char led;
+};
+
+static void handle_event(process_event_t ev, process_data_t data, struct blink_process_ctx *ctx)
+{
+  if (ev == PROCESS_EVENT_TIMER && etimer_expired(&ctx->et_blink)) {
+    leds_toggle(ctx->led);
+    etimer_set(&ctx->et_blink, CLOCK_SECOND / ctx->c);
+    printf("Blink %d\n", ctx->led);
+  } else if (ev == sensors_event && data == ctx->button) {
+    if (ctx->button->value(BUTTON_SENSOR_VALUE_STATE) == 0) {
+      if (ctx->c == 0) {
+        ctx->c = 1;
+      } else if (ctx->c < 8){
+        ctx->c <<= 1;
+      } else {
+        ctx->c = 0;
+        leds_off(ctx->led);
+      }
+      if (ctx->c) {
+        etimer_set(&ctx->et_blink, CLOCK_SECOND / ctx->c);
+      } else {
+        etimer_stop(&ctx->et_blink);
+      }
+    }
+  }
+}
+
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(blink_process_1, ev, data)
+{
+  static struct blink_process_ctx ctx;
+
+  PROCESS_BEGIN();
+
+  ctx.button = &button_1;
+  ctx.c = 0;
+  ctx.led = LEDS_1;
+  ctx.button->configure(SENSORS_ACTIVE, 1);
+
+  while (1) {
+    PROCESS_WAIT_EVENT();
+    handle_event(ev, data, &ctx);
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(blink_process_2, ev, data)
+{
+  static struct blink_process_ctx ctx;
+
+  PROCESS_BEGIN();
+
+  ctx.button = &button_2;
+  ctx.c = 0;
+  ctx.led = LEDS_2;
+  ctx.button->configure(SENSORS_ACTIVE, 1);
+
+  while (1) {
+    PROCESS_WAIT_EVENT();
+    handle_event(ev, data, &ctx);
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(blink_process_3, ev, data)
+{
+  static struct blink_process_ctx ctx;
+
+  PROCESS_BEGIN();
+
+  ctx.button = &button_3;
+  ctx.c = 0;
+  ctx.led = LEDS_3;
+  ctx.button->configure(SENSORS_ACTIVE, 1);
+
+  while (1) {
+    PROCESS_WAIT_EVENT();
+    handle_event(ev, data, &ctx);
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(blink_process_4, ev, data)
+{
+  static struct blink_process_ctx ctx;
+
+  PROCESS_BEGIN();
+
+  ctx.button = &button_4;
+  ctx.c = 0;
+  ctx.led = LEDS_4;
+  ctx.button->configure(SENSORS_ACTIVE, 1);
+
+  while (1) {
+    PROCESS_WAIT_EVENT();
+    handle_event(ev, data, &ctx);
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(temp, ev, data)
+{
+  static struct etimer tick;
+  PROCESS_BEGIN();
+
+  etimer_set(&tick, CLOCK_SECOND);
+
+  while (1) {
+    PROCESS_WAIT_EVENT();
+    if (ev == PROCESS_EVENT_TIMER && etimer_expired(&tick)) {
+      int32_t temp = temperature_sensor.value(0);
+      printf("temp: %"PRId32".%02"PRId32"\n", temp >> 2, (temp & 0x03)*25);
+      etimer_reset(&tick);
+    }
+  }
+
+  PROCESS_END();
+}
+/**
+ * @}
+ * @}
+ * @}
+ */

examples/nrf52dk/coap-demo/Makefile

@@ -0,0 +1,35 @@
+CONTIKI=../../..
+CFLAGS += -DPROJECT_CONF_H=\"project-conf.h\"
+
+ifeq ($(MAKECMDGOALS),)
+$(error Please specify whether coap-client or coap-server should be built)
+endif
+
+ifneq ($(filter coap-client coap-client.flash, $(MAKECMDGOALS)),)
+ifeq ($(SERVER_IPV6_ADDR),)
+$(error Please define SERVER_IPV6_ADDR=<full ipv6 addr>)
+else
+CFLAGS += -DSERVER_IPV6_ADDR=\"$(SERVER_IPV6_ADDR)\"
+CFLAGS += -DDEVICE_NAME=\"nRF52_DK_CoAP_Client\"
+endif
+else
+CFLAGS += -DDEVICE_NAME=\"nRF52-DK-CoAP-Server\"
+endif
+
+# automatically build RESTful resources
+REST_RESOURCES_DIR = ./resources
+REST_RESOURCES_FILES = $(notdir $(shell find $(REST_RESOURCES_DIR) -name '*.c' ! -name 'res-plugtest*'))
+
+PROJECTDIRS += $(REST_RESOURCES_DIR)
+PROJECT_SOURCEFILES += $(REST_RESOURCES_FILES)
+
+# linker optimizations
+SMALL=1
+
+# REST Engine shall use Erbium CoAP implementation
+APPS += er-coap
+APPS += rest-engine
+
+CONTIKI_WITH_RPL = 0
+
+include $(CONTIKI)/Makefile.include

examples/nrf52dk/coap-demo/README.md

@@ -0,0 +1,63 @@
+A CoAP demo for nRF52 DK
+========================
+This demo contains two applications: coap-server and coap-client which are similar to 
+[Coap Observable Server] and [Coap Observer Client] examples provided by the nRF5 IoT SDK.
+
+Note that before any CoAP requests can be made you'll need to configure an IPv6 connection 
+to the device and assign a routable IPv6 address.
+
+For details how to do this please refer to sections 'Establishing an IPv6 connection'
+and 'Distributing routable IPv6 prefix' in `platform/nrf52dk/README-BLE-6LoWPAN.md`.
+
+CoAP Server
+===========
+The server exposes the following resources:
+
+	host
+    |-- .well-known
+    |   `-- core
+    `-- lights
+        `-- led3
+        
+The state of LED 3 can be set and queried via CoAP through the observable resource `lights/led3`. Current
+state of LED 3 is returned as a text string in the payload. The value 0 means that LED 3 is off, 1 otherwise.
+
+Button 1 can be used to toggle state of the LED 3. This will cause a notification to be sent to 
+any subscriber observing `lights/led3`. The state of the resource can also be changed by using POST/PUT to
+the resource with desired state encoded as a text in the payload. Send 1 to switch on and 0 to switch off.
+
+In order to compile and flash the CoAP server to a DK execute:
+
+	make TARGET=nrf52dk coap-server.flash
+	
+Note, if you haven't previously used a given device with Contiki it is recommended
+to erase the device and flash SoftDevice before flashing CoAP application, i.e.,
+
+    make TARGET=nrf52dk erase
+    make TARGET=nrf52dk softdevice.flash
+
+Please refer to the *Testing* and *Python Example* sections of [Coap Observable Server] tutorial for detailed description how to query the Coap Server using a PC.
+
+CoAP Client
+===========
+CoAP client compliments the CoAP server application. When Button 1 on the DK is pressed the the 
+client subscribes to `lights/led3` resource. If successful the LED 4 will blink briefly. From this moment
+any change of the `lights/led3` resource will be automatically reflected by the client's LED 3. 
+
+Note that the client must know the server's IPv6 address. The address is specified as a make variable
+during compliation.
+  
+In order to compile and flash the CoAP client to DK execute:
+
+	make TARGET=nrf52dk SERVER_IPV6_ADDR=<full-ip6-address> coap-client.flash
+	
+Note, that you can use `NRF52_JLINK_SN=<SN>` to select a particular devkit in a case when
+you have more than one boards connected to PC. Please refer to `platform/README.md` for 
+details.
+	
+Please refer to the *Testing* and *Python Server Example* sections of [Coap Observer Client] tutorial for detailed description how to use CoAP client demo with a PC.
+
+Resources
+=========
+[Coap Observable Server] http://developer.nordicsemi.com/nRF5_IoT_SDK/doc/0.9.0/html/a00054.html
+[Coap Observer Client] http://developer.nordicsemi.com/nRF5_IoT_SDK/doc/0.9.0/html/a00051.html

examples/nrf52dk/coap-demo/coap-client.c

@@ -0,0 +1,185 @@
+/*
+ * Copyright (c) 2014, Daniele Alessandrelli.
+ * Copyright (c) 2015, Nordic Semiconductor
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ */
+
+/**
+ * \addtogroup nrf52dk-examples Demo projects for nRF52 DK
+ * @{
+ *
+ * \defgroup nrf52dk-coap-demo CoAP demo for nRF52 DK
+ * @{
+ *
+ * \file
+ *      Erbium (Er) CoAP observe client example.
+ * \author
+ *      Daniele Alessandrelli <daniele.alessandrelli@gmail.com>
+ * \author
+ *      Wojciech Bober <wojciech.bober@nordicsemi.no>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "contiki.h"
+#include "contiki-net.h"
+#include "er-coap-engine.h"
+#include "dev/button-sensor.h"
+#include "dev/leds.h"
+
+#define DEBUG 0
+#if DEBUG
+#include <stdio.h>
+#define PRINTF(...) printf(__VA_ARGS__)
+#else
+#define PRINTF(...)
+#endif
+
+/*----------------------------------------------------------------------------*/
+#define REMOTE_PORT       UIP_HTONS(COAP_DEFAULT_PORT)
+#define OBS_RESOURCE_URI  "lights/led3"
+#define SUBS_LED          LEDS_4
+#define OBS_LED           LEDS_3
+
+/*----------------------------------------------------------------------------*/
+static uip_ipaddr_t server_ipaddr[1]; /* holds the server ip address */
+static coap_observee_t *obs;
+static struct ctimer ct;
+/*----------------------------------------------------------------------------*/
+PROCESS(er_example_observe_client, "nRF52 DK Coap Observer Client");
+AUTOSTART_PROCESSES(&er_example_observe_client);
+/*----------------------------------------------------------------------------*/
+static void
+observe_led_off(void *d)
+{
+  leds_off(SUBS_LED);
+}
+/*----------------------------------------------------------------------------*/
+/*
+ * Handle the response to the observe request and the following notifications
+ */
+static void
+notification_callback(coap_observee_t *obs, void *notification,
+                      coap_notification_flag_t flag)
+{
+  int len = 0;
+  const uint8_t *payload = NULL;
+
+
+  PRINTF("Notification handler\n");
+  PRINTF("Observee URI: %s\n", obs->url);
+
+  if (notification) {
+    len = coap_get_payload(notification, &payload);
+  }
+
+  (void)len;
+
+  switch (flag) {
+    case NOTIFICATION_OK:
+      PRINTF("NOTIFICATION OK: %*s\n", len, (char *)payload);
+      if (*payload == '1') {
+        leds_on(OBS_LED);
+      } else {
+        leds_off(OBS_LED);
+      }
+      break;
+    case OBSERVE_OK: /* server accepeted observation request */
+      PRINTF("OBSERVE_OK: %*s\n", len, (char *)payload);
+      if (*payload == '1') {
+        leds_on(OBS_LED);
+      } else {
+        leds_off(OBS_LED);
+      }
+      leds_on(SUBS_LED);
+      ctimer_set(&ct, CLOCK_SECOND, observe_led_off, NULL);
+      break;
+    case OBSERVE_NOT_SUPPORTED:
+      PRINTF("OBSERVE_NOT_SUPPORTED: %*s\n", len, (char *)payload);
+      obs = NULL;
+      break;
+    case ERROR_RESPONSE_CODE:
+      PRINTF("ERROR_RESPONSE_CODE: %*s\n", len, (char *)payload);
+      obs = NULL;
+      break;
+    case NO_REPLY_FROM_SERVER:
+      PRINTF("NO_REPLY_FROM_SERVER: "
+             "removing observe registration with token %x%x\n",
+             obs->token[0], obs->token[1]);
+      obs = NULL;
+      break;
+  }
+}
+/*----------------------------------------------------------------------------*/
+/*
+ * The main (proto-)thread. It starts/stops the observation of the remote
+ * resource every time the timer elapses or the button (if available) is
+ * pressed
+ */
+PROCESS_THREAD(er_example_observe_client, ev, data)
+{
+  PROCESS_BEGIN();
+
+  uiplib_ipaddrconv(SERVER_IPV6_ADDR, server_ipaddr);
+
+  /* receives all CoAP messages */
+  coap_init_engine();
+
+#if PLATFORM_HAS_BUTTON
+  SENSORS_ACTIVATE(button_1);
+  SENSORS_ACTIVATE(button_2);
+#endif
+
+  /* toggle observation every time the timer elapses or the button is pressed */
+  while (1) {
+    PROCESS_YIELD();
+#if PLATFORM_HAS_BUTTON
+    if (ev == sensors_event) {
+      if (data == &button_1 && button_1.value(BUTTON_SENSOR_VALUE_STATE) == 0) {
+        PRINTF("Starting observation\n");
+        obs = coap_obs_request_registration(server_ipaddr, REMOTE_PORT,
+                                            OBS_RESOURCE_URI, notification_callback,
+                                            NULL);
+      }
+      if (data == &button_2 && button_2.value(BUTTON_SENSOR_VALUE_STATE) == 0) {
+        PRINTF("Stopping observation\n");
+        coap_obs_remove_observee(obs);
+        obs = NULL;
+      }
+    }
+#endif
+  }
+  PROCESS_END();
+}
+
+/**
+ * @}
+ * @}
+ */

examples/nrf52dk/coap-demo/coap-server.c

@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
+ * Copyright (c) 2015, Nordic Semiconductor
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ */
+
+/**
+ * \addtogroup nrf52dk-examples Demo projects for nRF52 DK
+ * @{
+ *
+ * \defgroup nrf52dk-coap-demo CoAP demo for nRF52dk
+ * @{
+ *
+ * \file
+ *      Erbium (Er) REST Engine example.
+ * \author
+ *      Matthias Kovatsch <kovatsch@inf.ethz.ch>
+ * \author
+ *      Wojciech Bober <wojciech.bober@nordicsemi.no>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "contiki.h"
+#include "contiki-net.h"
+#include "rest-engine.h"
+#include "uip.h"
+#include "dev/button-sensor.h"
+#include "dev/leds.h"
+
+#define DEBUG DEBUG_PRINT
+#include "net/ip/uip-debug.h"
+
+/*
+ * Resources to be activated need to be imported through the extern keyword.
+ * The build system automatically compiles the resources in the corresponding sub-directory.
+ */
+extern resource_t res_led3;
+
+static void
+print_local_addresses(void)
+{
+  int i;
+  uint8_t state;
+
+  PRINTF("Server IPv6 addresses:\n");
+  for(i = 0; i < UIP_DS6_ADDR_NB; i++) {
+    state = uip_ds6_if.addr_list[i].state;
+    if(uip_ds6_if.addr_list[i].isused && (state == ADDR_TENTATIVE || state
+                                          == ADDR_PREFERRED)) {
+      PRINTF("  ");
+      PRINT6ADDR(&uip_ds6_if.addr_list[i].ipaddr);
+      PRINTF("\n");
+      if(state == ADDR_TENTATIVE) {
+        uip_ds6_if.addr_list[i].state = ADDR_PREFERRED;
+      }
+    }
+  }
+}
+
+PROCESS(er_example_server, "nRF52 DK Coap Server");
+AUTOSTART_PROCESSES(&er_example_server);
+
+PROCESS_THREAD(er_example_server, ev, data)
+{
+  PROCESS_BEGIN();
+  PROCESS_PAUSE();
+
+  PRINTF("Starting Erbium Example Server\n");
+
+  PRINTF("uIP buffer: %u\n", UIP_BUFSIZE);
+  PRINTF("LL header: %u\n", UIP_LLH_LEN);
+  PRINTF("IP+UDP header: %u\n", UIP_IPUDPH_LEN);
+  PRINTF("REST max chunk: %u\n", REST_MAX_CHUNK_SIZE);
+
+  print_local_addresses();
+
+  /* Initialize the REST engine. */
+  rest_init_engine();
+  rest_activate_resource(&res_led3, "lights/led3");
+
+  SENSORS_ACTIVATE(button_1);
+
+  /* Define application-specific events here. */
+  while (1) {
+    PROCESS_WAIT_EVENT();
+
+    if (ev == sensors_event) {
+      if (data == &button_1 && button_1.value(BUTTON_SENSOR_VALUE_STATE) == 0) {
+        leds_toggle(LEDS_3);
+        res_led3.trigger();
+      }
+    }
+  }
+
+  PROCESS_END();
+}
+
+/**
+ * @}
+ * @}
+ */

examples/nrf52dk/coap-demo/project-conf.h

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ */
+
+/**
+ * \addtogroup nrf52dk-examples Demo projects for nRF52 DK
+ * @{
+ *
+ * \defgroup nrf52dk-coap-demo CoAP demo for nRF52dk
+ * @{
+ *
+ * \file
+ *      Erbium (Er) example project configuration.
+ * \author
+ *      Matthias Kovatsch <kovatsch@inf.ethz.ch>
+ */
+
+#ifndef __PROJECT_ERBIUM_CONF_H__
+#define __PROJECT_ERBIUM_CONF_H__
+
+/* Disabling TCP on CoAP nodes. */
+#undef UIP_CONF_TCP
+#define UIP_CONF_TCP                   0
+
+/* Increase rpl-border-router IP-buffer when using more than 64. */
+#undef REST_MAX_CHUNK_SIZE
+#define REST_MAX_CHUNK_SIZE            48
+
+/* Estimate your header size, especially when using Proxy-Uri. */
+/*
+   #undef COAP_MAX_HEADER_SIZE
+   #define COAP_MAX_HEADER_SIZE           70
+ */
+
+/* Multiplies with chunk size, be aware of memory constraints. */
+#undef COAP_MAX_OPEN_TRANSACTIONS
+#define COAP_MAX_OPEN_TRANSACTIONS     4
+
+/* Must be <= open transactions, default is COAP_MAX_OPEN_TRANSACTIONS-1. */
+/*
+   #undef COAP_MAX_OBSERVERS
+   #define COAP_MAX_OBSERVERS             2
+ */
+
+/* Filtering .well-known/core per query can be disabled to save space. */
+#undef COAP_LINK_FORMAT_FILTERING
+#define COAP_LINK_FORMAT_FILTERING     0
+#undef COAP_PROXY_OPTION_PROCESSING
+#define COAP_PROXY_OPTION_PROCESSING   0
+
+/* Enable client-side support for COAP observe */
+#define COAP_OBSERVE_CLIENT 1
+#endif /* __PROJECT_ERBIUM_CONF_H__ */
+
+/**
+ * @}
+ * @}
+ */

examples/nrf52dk/coap-demo/resources/res-leds.c

@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ */
+
+/**
+ * \file
+ *      Example resource
+ * \author
+ *      Matthias Kovatsch <kovatsch@inf.ethz.ch>
+ * \author
+ *      Wojciech Bober <wojciech.bober@nordicsemi.no>
+ */
+
+#include <string.h>
+#include "contiki.h"
+#include "rest-engine.h"
+#include "dev/leds.h"
+
+#define DEBUG DEBUG_NONE
+#include "net/ip/uip-debug.h"
+
+static void
+res_post_put_handler(void *request, void *response, uint8_t *buffer,
+                     uint16_t preferred_size, int32_t *offset);
+
+static void
+res_get_handler(void *request, void *response, uint8_t *buffer,
+                     uint16_t preferred_size, int32_t *offset);
+
+static void
+res_event_handler();
+
+/*A simple actuator example, depending on the color query parameter and post variable mode, corresponding led is activated or deactivated*/
+EVENT_RESOURCE(res_led3,
+               "title=\"LED3\"; obs",
+               res_get_handler,
+               res_post_put_handler,
+               res_post_put_handler,
+               NULL,
+               res_event_handler
+               );
+
+static void
+res_post_put_handler(void *request, void *response, uint8_t *buffer,
+                     uint16_t preferred_size, int32_t *offset)
+{
+  const uint8_t *payload;
+  REST.get_request_payload(request, &payload);
+
+  if (*payload == '0' || *payload == '1') {
+    if (*payload == '1') {
+      leds_on(LEDS_3);
+    } else {
+      leds_off(LEDS_3);
+    }
+    REST.notify_subscribers(&res_led3);
+    REST.set_response_status(response, REST.status.CHANGED);
+  } else {
+    REST.set_response_status(response, REST.status.BAD_REQUEST);
+  }
+}
+
+static void
+res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
+{
+  REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
+  REST.set_response_payload(response, buffer, snprintf((char *)buffer, preferred_size, "%d", (leds_get() & LEDS_3) ? 1 : 0));
+}
+
+/*
+ * Additionally, res_event_handler must be implemented for each EVENT_RESOURCE.
+ * It is called through <res_name>.trigger(), usually from the server process.
+ */
+static void
+res_event_handler()
+{
+  /* Notify the registered observers which will trigger the res_get_handler to create the response. */
+  REST.notify_subscribers(&res_led3);
+}

examples/nrf52dk/mqtt-demo/Makefile

@@ -0,0 +1,11 @@
+DEFINES+=PROJECT_CONF_H=\"project-conf.h\"
+
+all: mqtt-demo
+
+CONTIKI_WITH_IPV6 = 1
+CONTIKI_WITH_RPL = 0
+
+APPS += mqtt
+
+CONTIKI=../../..
+include $(CONTIKI)/Makefile.include

examples/nrf52dk/mqtt-demo/README.md

@@ -0,0 +1,74 @@
+MQTT Demo
+=========
+The MQTT client can be used to:
+
+* Publish sensor readings to an MQTT broker.
+* Subscribe to a topic and receive commands from an MQTT broker
+
+The demo will give some visual feedback with the green LED:
+* Very fast blinking: Searching for a network
+* Fast blinking: Connecting to broker
+* Slow, long blinking: Sending a publish message
+
+Note that before any MQTT messages can be sent or received you'll 
+need to configure an IPv6 connection to the device and assign a routable
+IPv6 address.
+
+For details how to do this please refer to sections 'Establishing an IPv6 connection'
+and 'Distributing routable IPv6 prefix' in `platform/nrf52dk/README-BLE-6LoWPAN.md`.
+
+Broker setup
+------------
+By default the example will attempt to publish readings to an MQTT broker
+running on the IPv6 address specified as `MQTT_DEMO_BROKER_IP_ADDR` in
+`project-conf.h`. This functionality was tested successfully with
+[mosquitto](http://mosquitto.org/).
+
+On Ubuntu you can install and run mosquitto broker using the following
+commands:
+
+	apt-get install mosquitto mosquitto_clients
+	killall mosquitto
+	mosquitto -p 1883 -v
+
+Publishing
+----------
+The publish messages include sensor readings but also some other information,
+such as device uptime in seconds and a message sequence number. The demo will
+publish to topic `iot-2/evt/status/fmt/json`. The device will connect using
+client-id `d:quickstart:cc2538:<device-id>`, where `<device-id>` gets
+constructed from the device's IEEE address.
+
+Subscribing
+-----------
+You can also subscribe to topics and receive commands, but this will only
+work if you use "Org ID" != 'quickstart'. To achieve this, you will need to
+change 'Org ID' (`DEFAULT_ORG_ID`). In this scenario, the device will subscribe
+to:
+
+`iot-2/cmd/+/fmt/json`
+
+You can then use this to toggle LEDs. To do this, you can for example
+use mosquitto client to publish to `iot-2/cmd/leds/fmt/json`. So, to change
+the state of an LED, you would do this:
+
+`mosquitto_pub -h <broker IP> -m "1" -t iot-2/cmd/leds/fmt/json`
+
+Where `broker IP` should be replaced with the IP address of your mosquitto
+broker (the one where you device has subscribed). Replace `-m "1'` with `-m "0"`
+to turn the LED back off.
+
+Bear in mind that, even though the topic suggests that messages are of json
+format, they are in fact not. This was done in order to avoid linking a json
+parser into the firmware. This comment only applies to parsing incoming
+messages, outgoing publish messages use proper json payload.
+
+IBM Quickstart Service
+----------------------
+It is also possible to publish to IBM's quickstart service. To do so, you need
+to undefine `MQTT_DEMO_BROKER_IP_ADDR`.
+
+If you want to use IBM's cloud service with a registered device, change
+'Org ID' (`DEFAULT_ORG_ID`) and provide the 'Auth Token' (`DEFAULT_AUTH_TOKEN`),
+which acts as a 'password', but bear in mind that it gets transported in clear
+text.

examples/nrf52dk/mqtt-demo/mqtt-demo.c

@@ -0,0 +1,721 @@
+/*
+ * Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
+ * Copyright (c) 2015, Nordic Semiconductor
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+/*---------------------------------------------------------------------------*/
+/**
+ * \addtogroup nrf52dk-examples Demo projects for nRF52 DK
+ * @{
+ *
+ * \defgroup nrf52dk-mqtt-demo nRF52 DK MQTT Demo Project
+ *
+ * Demonstrates MQTT functionality. Works with mosquitto.
+ * @{
+ *
+ * \file
+ * An MQTT example for the nrf52dk platform
+ */
+/*---------------------------------------------------------------------------*/
+#include "contiki-conf.h"
+#include "mqtt.h"
+#include "net/ip/uip.h"
+#include "net/ipv6/uip-icmp6.h"
+#include "net/ipv6/sicslowpan.h"
+#include "sys/etimer.h"
+#include "sys/ctimer.h"
+#include "lib/sensors.h"
+#include "dev/button-sensor.h"
+#include "dev/temperature-sensor.h"
+#include "dev/leds.h"
+
+#include <string.h>
+/*---------------------------------------------------------------------------*/
+/*
+ * IBM server: quickstart.messaging.internetofthings.ibmcloud.com
+ * (184.172.124.189) mapped in an NAT64 (prefix 64:ff9b::/96) IPv6 address
+ * Note: If not able to connect; lookup the IP address again as it may change.
+ *
+ * Alternatively, publish to a local MQTT broker (e.g. mosquitto) running on
+ * the node that hosts your border router
+ */
+#ifdef MQTT_DEMO_BROKER_IP_ADDR
+static const char *broker_ip = MQTT_DEMO_BROKER_IP_ADDR;
+#define DEFAULT_ORG_ID              "mqtt-demo"
+#else
+static const char *broker_ip = "0064:ff9b:0000:0000:0000:0000:b8ac:7cbd";
+#define DEFAULT_ORG_ID              "quickstart"
+#endif
+/*---------------------------------------------------------------------------*/
+/*
+ * A timeout used when waiting for something to happen (e.g. to connect or to
+ * disconnect)
+ */
+#define STATE_MACHINE_PERIODIC     (CLOCK_SECOND >> 1)
+/*---------------------------------------------------------------------------*/
+/* Provide visible feedback via LEDS during various states */
+/* When connecting to broker */
+#define CONNECTING_LED_DURATION    (CLOCK_SECOND >> 2)
+
+/* Each time we try to publish */
+#define PUBLISH_LED_ON_DURATION    (CLOCK_SECOND)
+/*---------------------------------------------------------------------------*/
+/* Connections and reconnections */
+#define RETRY_FOREVER              0xFF
+#define RECONNECT_INTERVAL         (CLOCK_SECOND * 2)
+
+/*
+ * Number of times to try reconnecting to the broker.
+ * Can be a limited number (e.g. 3, 10 etc) or can be set to RETRY_FOREVER
+ */
+#define RECONNECT_ATTEMPTS         RETRY_FOREVER
+#define CONNECTION_STABLE_TIME     (CLOCK_SECOND * 5)
+static struct timer connection_life;
+static uint8_t connect_attempt;
+/*---------------------------------------------------------------------------*/
+/* Various states */
+static uint8_t state;
+#define STATE_INIT            0
+#define STATE_REGISTERED      1
+#define STATE_CONNECTING      2
+#define STATE_CONNECTED       3
+#define STATE_PUBLISHING      4
+#define STATE_DISCONNECTED    5
+#define STATE_NEWCONFIG       6
+#define STATE_CONFIG_ERROR 0xFE
+#define STATE_ERROR        0xFF
+/*---------------------------------------------------------------------------*/
+#define CONFIG_ORG_ID_LEN        32
+#define CONFIG_TYPE_ID_LEN       32
+#define CONFIG_AUTH_TOKEN_LEN    32
+#define CONFIG_EVENT_TYPE_ID_LEN 32
+#define CONFIG_CMD_TYPE_LEN       8
+#define CONFIG_IP_ADDR_STR_LEN   64
+/*---------------------------------------------------------------------------*/
+#define RSSI_MEASURE_INTERVAL_MAX 86400 /* secs: 1 day */
+#define RSSI_MEASURE_INTERVAL_MIN     5 /* secs */
+#define PUBLISH_INTERVAL_MAX      86400 /* secs: 1 day */
+#define PUBLISH_INTERVAL_MIN          5 /* secs */
+/*---------------------------------------------------------------------------*/
+/* A timeout used when waiting to connect to a network */
+#define NET_CONNECT_PERIODIC        CLOCK_SECOND
+#define NO_NET_LED_DURATION         (NET_CONNECT_PERIODIC >> 1)
+/*---------------------------------------------------------------------------*/
+/* Default configuration values */
+#define DEFAULT_TYPE_ID             "nrf52dk"
+#define DEFAULT_AUTH_TOKEN          "AUTHZ"
+#define DEFAULT_EVENT_TYPE_ID       "status"
+#define DEFAULT_SUBSCRIBE_CMD_TYPE  "+"
+#define DEFAULT_BROKER_PORT         1883
+#define DEFAULT_PUBLISH_INTERVAL    (30 * CLOCK_SECOND)
+#define DEFAULT_KEEP_ALIVE_TIMER    60
+#define DEFAULT_RSSI_MEAS_INTERVAL  (CLOCK_SECOND * 30)
+/*---------------------------------------------------------------------------*/
+/* Take a sensor reading on button press */
+#define PUBLISH_TRIGGER (&button_sensor)
+
+/* Payload length of ICMPv6 echo requests used to measure RSSI with def rt */
+#define ECHO_REQ_PAYLOAD_LEN   20
+/*---------------------------------------------------------------------------*/
+PROCESS_NAME(mqtt_demo_process);
+AUTOSTART_PROCESSES(&mqtt_demo_process);
+/*---------------------------------------------------------------------------*/
+/**
+ * \brief Data structure declaration for the MQTT client configuration
+ */
+typedef struct mqtt_client_config {
+  char org_id[CONFIG_ORG_ID_LEN];
+  char type_id[CONFIG_TYPE_ID_LEN];
+  char auth_token[CONFIG_AUTH_TOKEN_LEN];
+  char event_type_id[CONFIG_EVENT_TYPE_ID_LEN];
+  char broker_ip[CONFIG_IP_ADDR_STR_LEN];
+  char cmd_type[CONFIG_CMD_TYPE_LEN];
+  clock_time_t pub_interval;
+  int def_rt_ping_interval;
+  uint16_t broker_port;
+} mqtt_client_config_t;
+/*---------------------------------------------------------------------------*/
+/* Maximum TCP segment size for outgoing segments of our socket */
+#define MAX_TCP_SEGMENT_SIZE    32
+/*---------------------------------------------------------------------------*/
+#define STATUS_LED LEDS_GREEN
+/*---------------------------------------------------------------------------*/
+/*
+ * Buffers for Client ID and Topic.
+ * Make sure they are large enough to hold the entire respective string
+ *
+ * d:quickstart:status:EUI64 is 32 bytes long
+ * iot-2/evt/status/fmt/json is 25 bytes
+ * We also need space for the null termination
+ */
+#define BUFFER_SIZE 64
+static char client_id[BUFFER_SIZE];
+static char pub_topic[BUFFER_SIZE];
+static char sub_topic[BUFFER_SIZE];
+/*---------------------------------------------------------------------------*/
+/*
+ * The main MQTT buffers.
+ * We will need to increase if we start publishing more data.
+ */
+#define APP_BUFFER_SIZE 128
+static struct mqtt_connection conn;
+static char app_buffer[APP_BUFFER_SIZE];
+/*---------------------------------------------------------------------------*/
+#define QUICKSTART "quickstart"
+/*---------------------------------------------------------------------------*/
+static struct mqtt_message *msg_ptr = 0;
+static struct etimer publish_periodic_timer;
+static struct ctimer ct;
+static char *buf_ptr;
+static uint16_t seq_nr_value = 0;
+/*---------------------------------------------------------------------------*/
+/* Parent RSSI functionality */
+static struct uip_icmp6_echo_reply_notification echo_reply_notification;
+static struct etimer echo_request_timer;
+static int def_rt_rssi = 0;
+/*---------------------------------------------------------------------------*/
+static mqtt_client_config_t conf;
+/*---------------------------------------------------------------------------*/
+PROCESS(mqtt_demo_process, "MQTT Demo");
+/*---------------------------------------------------------------------------*/
+int
+ipaddr_sprintf(char *buf, uint8_t buf_len, const uip_ipaddr_t *addr)
+{
+  uint16_t a;
+  uint8_t len = 0;
+  int i, f;
+  for(i = 0, f = 0; i < sizeof(uip_ipaddr_t); i += 2) {
+    a = (addr->u8[i] << 8) + addr->u8[i + 1];
+    if(a == 0 && f >= 0) {
+      if(f++ == 0) {
+        len += snprintf(&buf[len], buf_len - len, "::");
+      }
+    } else {
+      if(f > 0) {
+        f = -1;
+      } else if(i > 0) {
+        len += snprintf(&buf[len], buf_len - len, ":");
+      }
+      len += snprintf(&buf[len], buf_len - len, "%x", a);
+    }
+  }
+
+  return len;
+}
+/*---------------------------------------------------------------------------*/
+static void
+echo_reply_handler(uip_ipaddr_t *source, uint8_t ttl, uint8_t *data,
+                   uint16_t datalen)
+{
+  if(uip_ip6addr_cmp(source, uip_ds6_defrt_choose())) {
+    def_rt_rssi = sicslowpan_get_last_rssi();
+  }
+}
+/*---------------------------------------------------------------------------*/
+static void
+publish_led_off(void *d)
+{
+  leds_off(STATUS_LED);
+}
+/*---------------------------------------------------------------------------*/
+static void
+pub_handler(const char *topic, uint16_t topic_len, const uint8_t *chunk,
+            uint16_t chunk_len)
+{
+  DBG("Pub Handler: topic='%s' (len=%u), chunk_len=%u\n", topic, topic_len,
+      chunk_len);
+
+  /* If we don't like the length, ignore */
+  if(topic_len != 23 || chunk_len != 1) {
+    printf("Incorrect topic or chunk len. Ignored\n");
+    return;
+  }
+
+  /* If the format != json, ignore */
+  if(strncmp(&topic[topic_len - 4], "json", 4) != 0) {
+    printf("Incorrect format\n");
+  }
+
+  if(strncmp(&topic[10], "leds", 4) == 0) {
+    if(chunk[0] == '1') {
+      leds_on(LEDS_RED);
+    } else if(chunk[0] == '0') {
+      leds_off(LEDS_RED);
+    }
+    return;
+  }
+}
+/*---------------------------------------------------------------------------*/
+static void
+mqtt_event(struct mqtt_connection *m, mqtt_event_t event, void *data)
+{
+  switch(event) {
+  case MQTT_EVENT_CONNECTED: {
+    DBG("APP - Application has a MQTT connection\n");
+    timer_set(&connection_life, CONNECTION_STABLE_TIME);
+    state = STATE_CONNECTED;
+    break;
+  }
+  case MQTT_EVENT_DISCONNECTED: {
+    DBG("APP - MQTT Disconnect. Reason %u\n", *((mqtt_event_t *)data));
+
+    state = STATE_DISCONNECTED;
+    process_poll(&mqtt_demo_process);
+    break;
+  }
+  case MQTT_EVENT_PUBLISH: {
+    msg_ptr = data;
+
+    /* Implement first_flag in publish message? */
+    if(msg_ptr->first_chunk) {
+      msg_ptr->first_chunk = 0;
+      DBG("APP - Application received a publish on topic '%s'. Payload "
+          "size is %i bytes. Content:\n\n",
+          msg_ptr->topic, msg_ptr->payload_length);
+    }
+
+    pub_handler(msg_ptr->topic, strlen(msg_ptr->topic), msg_ptr->payload_chunk,
+                msg_ptr->payload_length);
+    break;
+  }
+  case MQTT_EVENT_SUBACK: {
+    DBG("APP - Application is subscribed to topic successfully\n");
+    break;
+  }
+  case MQTT_EVENT_UNSUBACK: {
+    DBG("APP - Application is unsubscribed to topic successfully\n");
+    break;
+  }
+  case MQTT_EVENT_PUBACK: {
+    DBG("APP - Publishing complete\n");
+    break;
+  }
+  default:
+    DBG("APP - Application got a unhandled MQTT event: %i\n", event);
+    break;
+  }
+}
+/*---------------------------------------------------------------------------*/
+static int
+construct_pub_topic(void)
+{
+  int len = snprintf(pub_topic, BUFFER_SIZE, "iot-2/evt/%s/fmt/json",
+                     conf.event_type_id);
+
+  /* len < 0: Error. Len >= BUFFER_SIZE: Buffer too small */
+  if(len < 0 || len >= BUFFER_SIZE) {
+    printf("Pub Topic: %d, Buffer %d\n", len, BUFFER_SIZE);
+    return 0;
+  }
+
+  return 1;
+}
+/*---------------------------------------------------------------------------*/
+static int
+construct_sub_topic(void)
+{
+  int len = snprintf(sub_topic, BUFFER_SIZE, "iot-2/cmd/%s/fmt/json",
+                     conf.cmd_type);
+
+  /* len < 0: Error. Len >= BUFFER_SIZE: Buffer too small */
+  if(len < 0 || len >= BUFFER_SIZE) {
+    printf("Sub Topic: %d, Buffer %d\n", len, BUFFER_SIZE);
+    return 0;
+  }
+
+  return 1;
+}
+/*---------------------------------------------------------------------------*/
+static int
+construct_client_id(void)
+{
+  int len = snprintf(client_id, BUFFER_SIZE, "d:%s:%s:%02x%02x%02x%02x%02x%02x",
+                     conf.org_id, conf.type_id,
+                     linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
+                     linkaddr_node_addr.u8[2], linkaddr_node_addr.u8[5],
+                     linkaddr_node_addr.u8[6], linkaddr_node_addr.u8[7]);
+
+  /* len < 0: Error. Len >= BUFFER_SIZE: Buffer too small */
+  if(len < 0 || len >= BUFFER_SIZE) {
+    printf("Client ID: %d, Buffer %d\n", len, BUFFER_SIZE);
+    return 0;
+  }
+
+  return 1;
+}
+/*---------------------------------------------------------------------------*/
+static void
+update_config(void)
+{
+  if(construct_client_id() == 0) {
+    /* Fatal error. Client ID larger than the buffer */
+    state = STATE_CONFIG_ERROR;
+    return;
+  }
+
+  if(construct_sub_topic() == 0) {
+    /* Fatal error. Topic larger than the buffer */
+    state = STATE_CONFIG_ERROR;
+    return;
+  }
+
+  if(construct_pub_topic() == 0) {
+    /* Fatal error. Topic larger than the buffer */
+    state = STATE_CONFIG_ERROR;
+    return;
+  }
+
+  /* Reset the counter */
+  seq_nr_value = 0;
+
+  state = STATE_INIT;
+
+  /*
+   * Schedule next timer event ASAP
+   *
+   * If we entered an error state then we won't do anything when it fires.
+   *
+   * Since the error at this stage is a config error, we will only exit this
+   * error state if we get a new config.
+   */
+  etimer_set(&publish_periodic_timer, 0);
+
+  return;
+}
+/*---------------------------------------------------------------------------*/
+static int
+init_config()
+{
+  /* Populate configuration with default values */
+  memset(&conf, 0, sizeof(mqtt_client_config_t));
+
+  memcpy(conf.org_id, DEFAULT_ORG_ID, strlen(DEFAULT_ORG_ID));
+  memcpy(conf.type_id, DEFAULT_TYPE_ID, strlen(DEFAULT_TYPE_ID));
+  memcpy(conf.auth_token, DEFAULT_AUTH_TOKEN, strlen(DEFAULT_AUTH_TOKEN));
+  memcpy(conf.event_type_id, DEFAULT_EVENT_TYPE_ID,
+         strlen(DEFAULT_EVENT_TYPE_ID));
+  memcpy(conf.broker_ip, broker_ip, strlen(broker_ip));
+  memcpy(conf.cmd_type, DEFAULT_SUBSCRIBE_CMD_TYPE, 1);
+
+  conf.broker_port = DEFAULT_BROKER_PORT;
+  conf.pub_interval = DEFAULT_PUBLISH_INTERVAL;
+  conf.def_rt_ping_interval = DEFAULT_RSSI_MEAS_INTERVAL;
+
+  return 1;
+}
+/*---------------------------------------------------------------------------*/
+static void
+subscribe(void)
+{
+  /* Publish MQTT topic in IBM quickstart format */
+  mqtt_status_t status;
+
+  status = mqtt_subscribe(&conn, NULL, sub_topic, MQTT_QOS_LEVEL_0);
+
+  DBG("APP - Subscribing!\n");
+  if(status == MQTT_STATUS_OUT_QUEUE_FULL) {
+    DBG("APP - Tried to subscribe but command queue was full!\n");
+  }
+}
+/*---------------------------------------------------------------------------*/
+static void
+publish(void)
+{
+  /* Publish MQTT topic in IBM quickstart format */
+  int len;
+  int remaining = APP_BUFFER_SIZE;
+
+  seq_nr_value++;
+
+  buf_ptr = app_buffer;
+
+  len = snprintf(buf_ptr, remaining,
+                 "{"
+                 "\"d\":{"
+                 "\"Seq #\":%d,"
+                 "\"Uptime (sec)\":%lu", seq_nr_value, clock_seconds());
+
+  if(len < 0 || len >= remaining) {
+    printf("Buffer too short. Have %d, need %d + \\0\n", remaining, len);
+    return;
+  }
+
+  remaining -= len;
+  buf_ptr += len;
+
+  /* Put our Default route's string representation in a buffer */
+  char def_rt_str[64];
+  memset(def_rt_str, 0, sizeof(def_rt_str));
+  ipaddr_sprintf(def_rt_str, sizeof(def_rt_str), uip_ds6_defrt_choose());
+
+  len = snprintf(buf_ptr, remaining, ",\"Def Route\":\"%s\",\"RSSI (dBm)\":%d",
+                 def_rt_str, def_rt_rssi);
+
+  if(len < 0 || len >= remaining) {
+    printf("Buffer too short. Have %d, need %d + \\0\n", remaining, len);
+    return;
+  }
+  remaining -= len;
+  buf_ptr += len;
+
+  len = snprintf(buf_ptr, remaining, ",\"On-Chip Temp (deg.C)\":%d",
+                 temperature_sensor.value(0));
+
+  if(len < 0 || len >= remaining) {
+    printf("Buffer too short. Have %d, need %d + \\0\n", remaining, len);
+    return;
+  }
+  remaining -= len;
+  buf_ptr += len;
+
+  len = snprintf(buf_ptr, remaining, "}}");
+
+  if(len < 0 || len >= remaining) {
+    printf("Buffer too short. Have %d, need %d + \\0\n", remaining, len);
+    return;
+  }
+
+  mqtt_publish(&conn, NULL, pub_topic, (uint8_t *)app_buffer,
+               strlen(app_buffer), MQTT_QOS_LEVEL_0, MQTT_RETAIN_OFF);
+
+  DBG("APP - Publish!\n");
+}
+/*---------------------------------------------------------------------------*/
+static void
+connect_to_broker(void)
+{
+  /* Connect to MQTT server */
+  mqtt_connect(&conn, conf.broker_ip, conf.broker_port,
+               conf.pub_interval * 3);
+
+  state = STATE_CONNECTING;
+}
+/*---------------------------------------------------------------------------*/
+static void
+ping_parent(void)
+{
+  if(uip_ds6_get_global(ADDR_PREFERRED) == NULL) {
+    return;
+  }
+
+  uip_icmp6_send(uip_ds6_defrt_choose(), ICMP6_ECHO_REQUEST, 0,
+                 ECHO_REQ_PAYLOAD_LEN);
+}
+/*---------------------------------------------------------------------------*/
+static void
+state_machine(void)
+{
+  switch(state) {
+  case STATE_INIT:
+    /* If we have just been configured register MQTT connection */
+    mqtt_register(&conn, &mqtt_demo_process, client_id, mqtt_event,
+                  MAX_TCP_SEGMENT_SIZE);
+
+    /*
+     * If we are not using the quickstart service (thus we are an IBM
+     * registered device), we need to provide user name and password
+     */
+    if(strncasecmp(conf.org_id, QUICKSTART, strlen(conf.org_id)) != 0) {
+      if(strlen(conf.auth_token) == 0) {
+        printf("User name set, but empty auth token\n");
+        state = STATE_ERROR;
+        break;
+      } else {
+        mqtt_set_username_password(&conn, "use-token-auth",
+                                   conf.auth_token);
+      }
+    }
+
+    /* _register() will set auto_reconnect. We don't want that. */
+    conn.auto_reconnect = 0;
+    connect_attempt = 1;
+
+    state = STATE_REGISTERED;
+    DBG("Init\n");
+    /* Continue */
+  case STATE_REGISTERED:
+    if(uip_ds6_get_global(ADDR_PREFERRED) != NULL) {
+      /* Registered and with a public IP. Connect */
+      DBG("Registered. Connect attempt %u\n", connect_attempt);
+      ping_parent();
+      connect_to_broker();
+    } else {
+      leds_on(STATUS_LED);
+      ctimer_set(&ct, NO_NET_LED_DURATION, publish_led_off, NULL);
+    }
+    etimer_set(&publish_periodic_timer, NET_CONNECT_PERIODIC);
+    return;
+    break;
+  case STATE_CONNECTING:
+    leds_on(STATUS_LED);
+    ctimer_set(&ct, CONNECTING_LED_DURATION, publish_led_off, NULL);
+    /* Not connected yet. Wait */
+    DBG("Connecting (%u)\n", connect_attempt);
+    break;
+  case STATE_CONNECTED:
+    /* Don't subscribe unless we are a registered device */
+    if(strncasecmp(conf.org_id, QUICKSTART, strlen(conf.org_id)) == 0) {
+      DBG("Using 'quickstart': Skipping subscribe\n");
+      state = STATE_PUBLISHING;
+    }
+    /* Continue */
+  case STATE_PUBLISHING:
+    /* If the timer expired, the connection is stable. */
+    if(timer_expired(&connection_life)) {
+      /*
+       * Intentionally using 0 here instead of 1: We want RECONNECT_ATTEMPTS
+       * attempts if we disconnect after a successful connect
+       */
+      connect_attempt = 0;
+    }
+
+    if(mqtt_ready(&conn) && conn.out_buffer_sent) {
+      /* Connected. Publish */
+      if(state == STATE_CONNECTED) {
+        subscribe();
+        state = STATE_PUBLISHING;
+      } else {
+        leds_on(STATUS_LED);
+        ctimer_set(&ct, PUBLISH_LED_ON_DURATION, publish_led_off, NULL);
+        publish();
+      }
+      etimer_set(&publish_periodic_timer, conf.pub_interval);
+
+      DBG("Publishing\n");
+      /* Return here so we don't end up rescheduling the timer */
+      return;
+    } else {
+      /*
+       * Our publish timer fired, but some MQTT packet is already in flight
+       * (either not sent at all, or sent but not fully ACKd).
+       *
+       * This can mean that we have lost connectivity to our broker or that
+       * simply there is some network delay. In both cases, we refuse to
+       * trigger a new message and we wait for TCP to either ACK the entire
+       * packet after retries, or to timeout and notify us.
+       */
+      DBG("Publishing... (MQTT state=%d, q=%u)\n", conn.state,
+          conn.out_queue_full);
+    }
+    break;
+  case STATE_DISCONNECTED:
+    DBG("Disconnected\n");
+    if(connect_attempt < RECONNECT_ATTEMPTS ||
+       RECONNECT_ATTEMPTS == RETRY_FOREVER) {
+      /* Disconnect and backoff */
+      clock_time_t interval;
+      mqtt_disconnect(&conn);
+      connect_attempt++;
+
+      interval = connect_attempt < 3 ? RECONNECT_INTERVAL << connect_attempt :
+        RECONNECT_INTERVAL << 3;
+
+      DBG("Disconnected. Attempt %u in %lu ticks\n", connect_attempt, interval);
+
+      etimer_set(&publish_periodic_timer, interval);
+
+      state = STATE_REGISTERED;
+      return;
+    } else {
+      /* Max reconnect attempts reached. Enter error state */
+      state = STATE_ERROR;
+      DBG("Aborting connection after %u attempts\n", connect_attempt - 1);
+    }
+    break;
+  case STATE_CONFIG_ERROR:
+    /* Idle away. The only way out is a new config */
+    printf("Bad configuration\n");
+    return;
+  case STATE_ERROR:
+  default:
+    leds_on(STATUS_LED);
+    /*
+     * 'default' should never happen.
+     *
+     * If we enter here it's because of some error. Stop timers. The only thing
+     * that can bring us out is a new config event
+     */
+    printf("Default case: State=0x%02x\n", state);
+    return;
+  }
+
+  /* If we didn't return so far, reschedule ourselves */
+  etimer_set(&publish_periodic_timer, STATE_MACHINE_PERIODIC);
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(mqtt_demo_process, ev, data)
+{
+
+  PROCESS_BEGIN();
+
+  printf("MQTT Demo Process\n");
+
+  if(init_config() != 1) {
+    PROCESS_EXIT();
+  }
+
+  update_config();
+
+  def_rt_rssi = 0x8000000;
+  uip_icmp6_echo_reply_callback_add(&echo_reply_notification,
+                                    echo_reply_handler);
+  etimer_set(&echo_request_timer, conf.def_rt_ping_interval);
+
+	PUBLISH_TRIGGER->configure(SENSORS_ACTIVE, 1);
+
+  /* Main loop */
+  while(1) {
+
+    PROCESS_YIELD();
+
+    if(ev == sensors_event && data == PUBLISH_TRIGGER) {
+      if(state == STATE_ERROR) {
+        connect_attempt = 1;
+        state = STATE_REGISTERED;
+      }
+    }
+
+    if((ev == PROCESS_EVENT_TIMER && data == &publish_periodic_timer) ||
+       ev == PROCESS_EVENT_POLL ||
+       (ev == sensors_event && data == PUBLISH_TRIGGER && PUBLISH_TRIGGER->value(BUTTON_SENSOR_VALUE_STATE) == 0)) {
+      state_machine();
+    }
+
+    if(ev == PROCESS_EVENT_TIMER && data == &echo_request_timer) {
+      ping_parent();
+      etimer_set(&echo_request_timer, conf.def_rt_ping_interval);
+    }
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+/**
+ * @}
+ * @}
+ */

examples/nrf52dk/mqtt-demo/project-conf.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2012, Texas Instruments Incorporated - http://www.ti.com/
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+/*---------------------------------------------------------------------------*/
+/**
+ * \addtogroup cc2538-mqtt-demo
+ * @{
+ *
+ * \file
+ * Project specific configuration defines for the MQTT demo
+ */
+/*---------------------------------------------------------------------------*/
+#ifndef PROJECT_CONF_H_
+#define PROJECT_CONF_H_
+/*---------------------------------------------------------------------------*/
+/* User configuration */
+#define MQTT_DEMO_STATUS_LED      LEDS_GREEN
+
+/* If undefined, the demo will attempt to connect to IBM's quickstart */
+#define MQTT_DEMO_BROKER_IP_ADDR "fd00::215:83ff:fed2:dbd7"
+/*---------------------------------------------------------------------------*/
+#endif /* PROJECT_CONF_H_ */
+/*---------------------------------------------------------------------------*/
+/** @} */

examples/nrf52dk/timer-test/Makefile

@@ -0,0 +1,9 @@
+CONTIKI_PROJECT = timer-test
+
+CONTIKI_WITH_RPL=0
+NRF52_WITHOUT_SOFTDEVICE=1
+
+all: $(CONTIKI_PROJECT) 
+
+CONTIKI = ../../..
+include $(CONTIKI)/Makefile.include

examples/nrf52dk/timer-test/README.md

@@ -0,0 +1,20 @@
+Timers test
+===========
+Timers test is an application allows for testing clocks implementation for nRF52 DK. 
+The results of different tests are output to the console.
+
+There are 4 tests performed:
+
+	1) TEST clock_delay_usec() - measures duration of a NOP delay using rtimer. It's expected
+	                             that difference is close to 0.
+	                             
+	2) TEST rtimer - schedules an rtimer callback after 1 second. Prints actual time difference
+	                 in rtimer and clock ticks. It's expected that both values are close to 0.
+	                 
+	3) TEST etimer - schedules an event timer and measures time difference. It is expected that
+	                 the value is close to 0.
+
+The example requires one DK and it doesn't use SoftDevice. To compile and flash the
+example run:
+
+	make TARGET=nrf52dk timer-test.flash

examples/nrf52dk/timer-test/timer-test.c

@@ -0,0 +1,131 @@
+/**
+ * \file
+ *         Tests related to clocks and timers
+ *         This is based on clock_test.c from the original sensinode port
+ *
+ * \author
+ *         Zach Shelby <zach@sensinode.com> (Original)
+ *         George Oikonomou - <oikonomou@users.sourceforge.net> (rtimer code)
+ *         Wojciech Bober <wojciech.bober@nordicsemi.no> (nRF52 DK adaptation)
+ *
+ */
+
+/**
+ * \addtogroup nrf52dk-examples Demo projects for nRF52 DK
+ * @{
+ */
+#include "contiki.h"
+#include "sys/clock.h"
+#include "sys/rtimer.h"
+#include "dev/leds.h"
+
+#include "nrf_delay.h"
+
+#include <stdio.h>
+/*---------------------------------------------------------------------------*/
+#define TEST_CLOCK_DELAY_USEC 1
+#define TEST_RTIMER           1
+#define TEST_ETIMER           1
+/*---------------------------------------------------------------------------*/
+static struct etimer et;
+
+#if TEST_CLOCK_DELAY_USEC
+static rtimer_clock_t start_count, end_count, diff;
+#endif
+
+#if TEST_ETIMER
+static clock_time_t count;
+#endif
+
+#if TEST_RTIMER
+static struct rtimer rt;
+static clock_time_t ct_now;
+rtimer_clock_t rt_now, rt_until;
+
+static volatile rtimer_clock_t rt_now_cb;
+static volatile clock_time_t ct_cb;
+#endif
+
+static uint8_t i;
+/*---------------------------------------------------------------------------*/
+PROCESS(clock_test_process, "Clock test process");
+AUTOSTART_PROCESSES(&clock_test_process);
+/*---------------------------------------------------------------------------*/
+#if TEST_RTIMER
+void
+rt_callback(struct rtimer *t, void *ptr)
+{
+  rt_now_cb = RTIMER_NOW();
+  ct_cb = clock_time();
+}
+#endif
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(clock_test_process, ev, data)
+{
+
+  PROCESS_BEGIN();
+  etimer_set(&et, 2 * CLOCK_SECOND);
+  PROCESS_YIELD();
+
+  printf("RTIMER_SECOND=%d CLOCK_SECOND=%d\n", RTIMER_SECOND, CLOCK_SECOND);
+
+#if TEST_CLOCK_DELAY_USEC
+  printf("=======================\n");
+  printf("TEST clock_delay_usec()\n");
+  printf("=======================\n");
+  i = 1;
+  while(i < 7) {
+    start_count = RTIMER_NOW();
+    clock_delay_usec(10000 * i);
+    end_count = RTIMER_NOW();
+    diff = end_count - start_count;
+    printf("difference [usec]: %ld\n", 10000 * i - (diff*(1000000/RTIMER_SECOND)));
+    i++;
+  }
+#endif
+
+#if TEST_RTIMER
+  printf("=======================\n");
+  printf("TEST rtimer\n");
+  printf("=======================\n");
+  i = 0;
+  while(i < 5) {
+    etimer_set(&et, 2 * CLOCK_SECOND);
+    rt_now = RTIMER_NOW();
+    ct_now = clock_time();
+    rt_until = rt_now + RTIMER_SECOND;
+    printf("now [ticks]: %lu until[ticks]: %lu\n", rt_now, rt_until);
+    if (rtimer_set(&rt, rt_until, 1, rt_callback, NULL) != RTIMER_OK) {
+      printf("Error setting\n");
+    }
+    PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
+    printf("rtimer difference [ticks]: %ld\n", RTIMER_SECOND - (rt_now_cb - rt_now));
+    printf("clock difference [ticks]: %ld\n", CLOCK_SECOND - (ct_cb - ct_now));
+    i++;
+  }
+#endif
+
+#if TEST_ETIMER
+  printf("=======================\n");
+  printf("TEST etimer\n");
+  printf("=======================\n");
+  i = 0;
+  while(i < 5) {
+    etimer_set(&et, i*CLOCK_SECOND);
+    count = clock_time();
+    PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
+    etimer_reset(&et);
+    printf("difference [ticks]: %lu\n", i*CLOCK_SECOND - (clock_time() - count));
+    leds_toggle(LEDS_RED);
+    i++;
+  }
+#endif
+
+  printf("Done!\n");
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+/**
+ * @}
+ */