diff --git a/examples/er-rest-example/er-example-observe-client.c b/examples/er-rest-example/er-example-observe-client.c
new file mode 100644
index 000000000..c950fdfd7
--- /dev/null
+++ b/examples/er-rest-example/er-example-observe-client.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2014, Daniele Alessandrelli.
+ * 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
+ *      Erbium (Er) CoAP observe client example.
+ * \author
+ *      Daniele Alessandrelli <daniele.alessandrelli@gmail.com>
+ */
+
+#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"
+
+/*----------------------------------------------------------------------------*/
+#define DEBUG 0
+#if DEBUG
+#define PRINTF(...) printf(__VA_ARGS__)
+#define PRINTFLN(format, ...) printf(format "\n", ##__VA_ARGS__)
+#define PRINT6ADDR(addr) PRINTF("[%02x%02x:%02x%02x:%02x%02x:%02x%02x:" \
+                                "%02x%02x:%02x%02x:%02x%02x:%02x%02x]", \
+                                ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], \
+                                ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], \
+                                ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], \
+                                ((uint8_t *)addr)[6], ((uint8_t *)addr)[7], \
+                                ((uint8_t *)addr)[8], ((uint8_t *)addr)[9], \
+                                ((uint8_t *)addr)[10], ((uint8_t *)addr)[11], \
+                                ((uint8_t *)addr)[12], ((uint8_t *)addr)[13], \
+                                ((uint8_t *)addr)[14], ((uint8_t *)addr)[15])
+#else
+#define PRINTF(...)
+#define PRINT6ADDR(addr)
+#define PRINTFLN(...)
+#endif
+
+/*----------------------------------------------------------------------------*/
+/* FIXME: This server address is hard-coded for Cooja */
+#define SERVER_NODE(ipaddr)   uip_ip6addr(ipaddr, 0xfe80, 0, 0, 0, 0x0212, \
+                                          0x7402, 0x0002, 0x0202)
+#define REMOTE_PORT     UIP_HTONS(COAP_DEFAULT_PORT)
+/* Toggle interval in seconds */
+#define TOGGLE_INTERVAL 30
+/* The path of the resource to observe */
+#define OBS_RESOURCE_URI "test/push"
+
+/*----------------------------------------------------------------------------*/
+static uip_ipaddr_t server_ipaddr[1]; /* holds the server ip address */
+static coap_observee_t *obs;
+
+/*----------------------------------------------------------------------------*/
+PROCESS(er_example_observe_client, "Erbium Coap Observe Client Example");
+AUTOSTART_PROCESSES(&er_example_observe_client);
+
+/*----------------------------------------------------------------------------*/
+/*
+ * 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);
+  }
+  switch(flag) {
+  case NOTIFICATION_OK:
+    printf("NOTIFICATION OK: %*s\n", len, (char *)payload);
+    break;
+  case OBSERVE_OK: /* server accepeted observation request */
+    printf("OBSERVE_OK: %*s\n", len, (char *)payload);
+    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;
+  }
+}
+/*----------------------------------------------------------------------------*/
+/*
+ * Toggle the observation of the remote resource
+ */
+void
+toggle_observation(void)
+{
+  if(obs) {
+    printf("Stopping observation\n");
+    coap_obs_remove_observee(obs);
+    obs = NULL;
+  } else {
+    printf("Starting observation\n");
+    obs = coap_obs_request_registration(server_ipaddr, REMOTE_PORT,
+                                        OBS_RESOURCE_URI, notification_callback, NULL);
+  }
+}
+/*----------------------------------------------------------------------------*/
+/*
+ * 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();
+
+  static struct etimer et;
+
+  /* store server address in server_ipaddr */
+  SERVER_NODE(server_ipaddr);
+  /* receives all CoAP messages */
+  coap_init_engine();
+  /* init timer and button (if available) */
+  etimer_set(&et, TOGGLE_INTERVAL * CLOCK_SECOND);
+#if PLATFORM_HAS_BUTTON
+  SENSORS_ACTIVATE(button_sensor);
+  printf("Press a button to start/stop observation of remote resource\n");
+#endif
+  /* toggle observation every time the timer elapses or the button is pressed */
+  while(1) {
+    PROCESS_YIELD();
+    if(etimer_expired(&et)) {
+      printf("--Toggle timer--\n");
+      toggle_observation();
+      printf("\n--Done--\n");
+      etimer_reset(&et);
+#if PLATFORM_HAS_BUTTON
+    } else if(ev == sensors_event && data == &button_sensor) {
+      printf("--Toggle tutton--\n");
+      toggle_observation();
+      printf("\n--Done--\n");
+#endif
+    }
+  }
+  PROCESS_END();
+}
diff --git a/examples/er-rest-example/project-conf.h b/examples/er-rest-example/project-conf.h
index 93c3c7281..53662619a 100644
--- a/examples/er-rest-example/project-conf.h
+++ b/examples/er-rest-example/project-conf.h
@@ -93,4 +93,6 @@
 #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__ */
diff --git a/examples/er-rest-example/server-client-observe.csc b/examples/er-rest-example/server-client-observe.csc
new file mode 100644
index 000000000..5d006056a
--- /dev/null
+++ b/examples/er-rest-example/server-client-observe.csc
@@ -0,0 +1,203 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<simconf>
+  <project EXPORT="discard">[APPS_DIR]/mrm</project>
+  <project EXPORT="discard">[APPS_DIR]/mspsim</project>
+  <project EXPORT="discard">[APPS_DIR]/avrora</project>
+  <project EXPORT="discard">[APPS_DIR]/serial_socket</project>
+  <project EXPORT="discard">[APPS_DIR]/collect-view</project>
+  <project EXPORT="discard">[APPS_DIR]/powertracker</project>
+  <simulation>
+    <title>REST with RPL router</title>
+    <speedlimit>1.0</speedlimit>
+    <randomseed>123456</randomseed>
+    <motedelay_us>1000000</motedelay_us>
+    <radiomedium>
+      org.contikios.cooja.radiomediums.UDGM
+      <transmitting_range>50.0</transmitting_range>
+      <interference_range>50.0</interference_range>
+      <success_ratio_tx>1.0</success_ratio_tx>
+      <success_ratio_rx>1.0</success_ratio_rx>
+    </radiomedium>
+    <events>
+      <logoutput>40000</logoutput>
+    </events>
+    <motetype>
+      org.contikios.cooja.mspmote.SkyMoteType
+      <identifier>rplroot</identifier>
+      <description>Sky RPL Root</description>
+      <source EXPORT="discard">[CONTIKI_DIR]/examples/ipv6/rpl-border-router/border-router.c</source>
+      <commands EXPORT="discard">make border-router.sky TARGET=sky</commands>
+      <firmware EXPORT="copy">[CONTIKI_DIR]/examples/ipv6/rpl-border-router/border-router.sky</firmware>
+      <moteinterface>org.contikios.cooja.interfaces.Position</moteinterface>
+      <moteinterface>org.contikios.cooja.interfaces.RimeAddress</moteinterface>
+      <moteinterface>org.contikios.cooja.interfaces.IPAddress</moteinterface>
+      <moteinterface>org.contikios.cooja.interfaces.Mote2MoteRelations</moteinterface>
+      <moteinterface>org.contikios.cooja.interfaces.MoteAttributes</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.MspClock</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.MspMoteID</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyButton</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyFlash</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyCoffeeFilesystem</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.Msp802154Radio</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.MspSerial</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyLED</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.MspDebugOutput</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyTemperature</moteinterface>
+    </motetype>
+    <motetype>
+      org.contikios.cooja.mspmote.SkyMoteType
+      <identifier>server</identifier>
+      <description>Erbium Server</description>
+      <source EXPORT="discard">[CONTIKI_DIR]/examples/er-rest-example/er-example-server.c</source>
+      <commands EXPORT="discard">make er-example-server.sky TARGET=sky</commands>
+      <firmware EXPORT="copy">[CONTIKI_DIR]/examples/er-rest-example/er-example-server.sky</firmware>
+      <moteinterface>org.contikios.cooja.interfaces.Position</moteinterface>
+      <moteinterface>org.contikios.cooja.interfaces.RimeAddress</moteinterface>
+      <moteinterface>org.contikios.cooja.interfaces.IPAddress</moteinterface>
+      <moteinterface>org.contikios.cooja.interfaces.Mote2MoteRelations</moteinterface>
+      <moteinterface>org.contikios.cooja.interfaces.MoteAttributes</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.MspClock</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.MspMoteID</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyButton</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyFlash</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyCoffeeFilesystem</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.Msp802154Radio</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.MspSerial</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyLED</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.MspDebugOutput</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyTemperature</moteinterface>
+    </motetype>
+    <motetype>
+      org.contikios.cooja.mspmote.SkyMoteType
+      <identifier>client</identifier>
+      <description>Erbium Client</description>
+      <source EXPORT="discard">[CONTIKI_DIR]/examples/er-rest-example/er-example-observe-client.c</source>
+      <commands EXPORT="discard">make er-example-observe-client.sky TARGET=sky</commands>
+      <firmware EXPORT="copy">[CONTIKI_DIR]/examples/er-rest-example/er-example-observe-client.sky</firmware>
+      <moteinterface>org.contikios.cooja.interfaces.Position</moteinterface>
+      <moteinterface>org.contikios.cooja.interfaces.RimeAddress</moteinterface>
+      <moteinterface>org.contikios.cooja.interfaces.IPAddress</moteinterface>
+      <moteinterface>org.contikios.cooja.interfaces.Mote2MoteRelations</moteinterface>
+      <moteinterface>org.contikios.cooja.interfaces.MoteAttributes</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.MspClock</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.MspMoteID</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyButton</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyFlash</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyCoffeeFilesystem</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.Msp802154Radio</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.MspSerial</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyLED</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.MspDebugOutput</moteinterface>
+      <moteinterface>org.contikios.cooja.mspmote.interfaces.SkyTemperature</moteinterface>
+    </motetype>
+    <mote>
+      <breakpoints />
+      <interface_config>
+        org.contikios.cooja.interfaces.Position
+        <x>33.260163187353555</x>
+        <y>30.643217359962595</y>
+        <z>0.0</z>
+      </interface_config>
+      <interface_config>
+        org.contikios.cooja.mspmote.interfaces.MspMoteID
+        <id>1</id>
+      </interface_config>
+      <motetype_identifier>rplroot</motetype_identifier>
+    </mote>
+    <mote>
+      <breakpoints />
+      <interface_config>
+        org.contikios.cooja.interfaces.Position
+        <x>54.537149936813485</x>
+        <y>51.51086225537906</y>
+        <z>0.0</z>
+      </interface_config>
+      <interface_config>
+        org.contikios.cooja.mspmote.interfaces.MspMoteID
+        <id>2</id>
+      </interface_config>
+      <motetype_identifier>server</motetype_identifier>
+    </mote>
+    <mote>
+      <breakpoints />
+      <interface_config>
+        org.contikios.cooja.interfaces.Position
+        <x>77.97942851220571</x>
+        <y>67.86182390447284</y>
+        <z>0.0</z>
+      </interface_config>
+      <interface_config>
+        org.contikios.cooja.mspmote.interfaces.MspMoteID
+        <id>3</id>
+      </interface_config>
+      <motetype_identifier>client</motetype_identifier>
+    </mote>
+  </simulation>
+  <plugin>
+    org.contikios.cooja.plugins.SimControl
+    <width>259</width>
+    <z>3</z>
+    <height>179</height>
+    <location_x>2</location_x>
+    <location_y>1</location_y>
+  </plugin>
+  <plugin>
+    org.contikios.cooja.plugins.Visualizer
+    <plugin_config>
+      <skin>org.contikios.cooja.plugins.skins.IDVisualizerSkin</skin>
+      <skin>org.contikios.cooja.plugins.skins.UDGMVisualizerSkin</skin>
+      <skin>org.contikios.cooja.plugins.skins.MoteTypeVisualizerSkin</skin>
+      <skin>org.contikios.cooja.plugins.skins.AttributeVisualizerSkin</skin>
+      <skin>org.contikios.cooja.plugins.skins.LEDVisualizerSkin</skin>
+      <skin>org.contikios.cooja.plugins.skins.AddressVisualizerSkin</skin>
+      <viewport>2.092412892721766 0.0 0.0 2.092412892721766 34.70057915472623 -45.606066372444175</viewport>
+    </plugin_config>
+    <width>300</width>
+    <z>4</z>
+    <height>178</height>
+    <location_x>261</location_x>
+    <location_y>1</location_y>
+  </plugin>
+  <plugin>
+    org.contikios.cooja.plugins.LogListener
+    <plugin_config>
+      <filter />
+      <formatted_time />
+      <coloring />
+    </plugin_config>
+    <width>762</width>
+    <z>0</z>
+    <height>491</height>
+    <location_x>2</location_x>
+    <location_y>182</location_y>
+  </plugin>
+  <plugin>
+    org.contikios.cooja.plugins.RadioLogger
+    <plugin_config>
+      <split>167</split>
+      <formatted_time />
+      <showdups>false</showdups>
+      <hidenodests>false</hidenodests>
+      <analyzers name="6lowpan" />
+    </plugin_config>
+    <width>560</width>
+    <z>1</z>
+    <height>492</height>
+    <location_x>764</location_x>
+    <location_y>181</location_y>
+  </plugin>
+  <plugin>
+    org.contikios.cooja.serialsocket.SerialSocketServer
+    <mote_arg>0</mote_arg>
+    <plugin_config>
+      <port>60001</port>
+      <bound>true</bound>
+    </plugin_config>
+    <width>362</width>
+    <z>2</z>
+    <height>116</height>
+    <location_x>561</location_x>
+    <location_y>1</location_y>
+  </plugin>
+</simconf>
+