diff --git a/Makefile.dep b/Makefile.dep
index 0e999f9411b9b587bc81101605e63952eab96310..6a93d54740e255e7c44503a8f4037d450e9ce324 100644
--- a/Makefile.dep
+++ b/Makefile.dep
@@ -707,6 +707,12 @@ ifneq (,$(filter skald,$(USEMODULE)))
USEMODULE += xtimer
USEMODULE += random
endif
+
+ifneq (,$(filter rdcli_common,$(USEMODULE)))
+ USEMODULE += luid
+ USEMODULE += fmt
+endif
+
# always select gpio (until explicit dependencies are sorted out)
FEATURES_OPTIONAL += periph_gpio
diff --git a/sys/Makefile b/sys/Makefile
index cc6d2ab074bcc643ea4ec4a2649237a1c804287d..3c48acd69d12bca5bfd4b625b17669f39ff2ac8a 100644
--- a/sys/Makefile
+++ b/sys/Makefile
@@ -127,6 +127,9 @@ endif
ifneq (,$(filter skald,$(USEMODULE)))
DIRS += net/skald
endif
+ifneq (,$(filter rdcli_common,$(USEMODULE)))
+ DIRS += net/application_layer/rdcli_common
+endif
DIRS += $(dir $(wildcard $(addsuffix /Makefile, $(USEMODULE))))
diff --git a/sys/auto_init/auto_init.c b/sys/auto_init/auto_init.c
index fcff85bec8a39388994da000c78c9f322f83bdba..4896751c2644a32bb230acc07f7cd2b4dc64ad8a 100644
--- a/sys/auto_init/auto_init.c
+++ b/sys/auto_init/auto_init.c
@@ -159,6 +159,11 @@ void auto_init(void)
DEBUG("Auto init Skald\n");
skald_init();
#endif
+#ifdef MODULE_RDCLI_COMMON
+ DEBUG("Auto init rdcli_common module\n");
+ extern void rdcli_common_init(void);
+ rdcli_common_init();
+#endif
/* initialize network devices */
#ifdef MODULE_AUTO_INIT_GNRC_NETIF
diff --git a/sys/include/net/rdcli_common.h b/sys/include/net/rdcli_common.h
new file mode 100644
index 0000000000000000000000000000000000000000..005928b219801648fb1a3593f6333ea3a8ea2a87
--- /dev/null
+++ b/sys/include/net/rdcli_common.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2017 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @defgroup net_rdcli_common Shared Functions for CoRE RD Clients
+ * @ingroup net_rdcli
+ * @{
+ *
+ * @file
+ * @brief Shared CoRE RD client functions
+ *
+ * @author Hauke Petersen <hauke.petersen@fu-berlin.de>
+ */
+
+#ifndef NET_RDCLI_COMMON_H
+#define NET_RDCLI_COMMON_H
+
+#include "net/rdcli_config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Export the local endpoint identifier
+ *
+ * @note Use rdcli_common_get_ep() for accessing the endpoint identifier
+ */
+extern char rdcli_ep[];
+
+/**
+ * @brief Generate unique endpoint identifier (ep)
+ */
+void rdcli_common_init(void);
+
+/**
+ * @brief Get the local endpoint identifier
+ */
+static inline const char *rdcli_common_get_ep(void)
+{
+ return (const char *)rdcli_ep;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NET_RDCLI_COMMON_H */
+/** @} */
diff --git a/sys/include/net/rdcli_config.h b/sys/include/net/rdcli_config.h
new file mode 100644
index 0000000000000000000000000000000000000000..906d37fc66752c29518ee7a91095c975afaf0aa7
--- /dev/null
+++ b/sys/include/net/rdcli_config.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2017 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @defgroup net_rdcli_config CoAP Resource Directory Client Configuration
+ * @ingroup net_rdcli
+ * @{
+ *
+ * @file
+ * @brief
+ *
+ * @author Hauke Petersen <hauke.petersen@fu-berlin.de>
+ */
+
+#ifndef NET_RDCLI_CONFIG_H
+#define NET_RDCLI_CONFIG_H
+
+#include "net/ipv6/addr.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name Endpoint ID definition
+ *
+ * Per default, the endpoint ID (ep) is generated by concatenation of a user
+ * defined prefix (RDCLI_EP_PREFIX) and a locally unique ID (luid) encoded in
+ * hexadecimal formatting with the given length of characters
+ * (RDCLI_EP_SUFFIX_LEN).
+ *
+ * Alternatively, the endpoint ID value can be defined at compile time by
+ * assigning a string value to the RDCLI_ED macro.
+ *
+ * @{
+ */
+#ifndef RDCLI_EP
+/**
+ * @brief Number of generated hexadecimal characters added to the ep
+ */
+#define RDCLI_EP_SUFFIX_LEN (16)
+
+/**
+ * @brief Default static prefix used for the generated ep
+ */
+#define RDCLI_EP_PREFIX "RIOT-"
+#endif
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NET_RDCLI_CONFIG_H */
+/** @} */
diff --git a/sys/net/application_layer/rdcli_common/Makefile b/sys/net/application_layer/rdcli_common/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..48422e909a47d7cd428d10fa73825060ccc8d8c2
--- /dev/null
+++ b/sys/net/application_layer/rdcli_common/Makefile
@@ -0,0 +1 @@
+include $(RIOTBASE)/Makefile.base
diff --git a/sys/net/application_layer/rdcli_common/rdcli_common.c b/sys/net/application_layer/rdcli_common/rdcli_common.c
new file mode 100644
index 0000000000000000000000000000000000000000..d8298930c48b3f8422f54bc7c0c672dc75c84c41
--- /dev/null
+++ b/sys/net/application_layer/rdcli_common/rdcli_common.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2017 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup net_rdcli_common
+ * @{
+ *
+ * @file
+ * @brief Implementation of common functions for CoRE RD clients
+ *
+ * @author Hauke Petersen <hauke.petersen@fu-berlin.de>
+ *
+ * @}
+ */
+
+#include "fmt.h"
+#include "luid.h"
+
+#include "net/rdcli_common.h"
+
+#define ENABLE_DEBUG (0)
+#include "debug.h"
+
+
+#ifdef RDCLI_EP
+#define EP_LEN (sizeof(RDCLI_EP))
+#define BUFSIZE (EP_LEN + 1)
+#else
+#define PREFIX_LEN (sizeof(RDCLI_EP_PREFIX))
+#define BUFSIZE (PREFIX_LEN + RDCLI_EP_SUFFIX_LEN + 1)
+#endif
+
+char rdcli_ep[BUFSIZE];
+
+void rdcli_common_init(void)
+{
+ size_t pos = 0;
+
+#ifdef RDCLI_EP
+ memcpy(rdcli_ep, RDCLI_EP, EP_LEN);
+ pos += EP_LEN;
+#else
+ uint8_t luid[RDCLI_EP_SUFFIX_LEN / 2];
+
+ if (PREFIX_LEN) {
+ memcpy(rdcli_ep, RDCLI_EP_PREFIX, PREFIX_LEN);
+ pos += PREFIX_LEN - 1;
+ }
+
+ luid_get(luid, sizeof(luid));
+ fmt_bytes_hex(&rdcli_ep[pos], luid, sizeof(luid));
+#endif
+
+ rdcli_ep[pos] = '\0';
+}