diff --git a/configs/sim/README.txt b/configs/sim/README.txt
index e3712b11f9..7fa886b5bd 100644
--- a/configs/sim/README.txt
+++ b/configs/sim/README.txt
@@ -807,6 +807,12 @@ pashello
 
   Configures to use apps/examples/pashello.
 
+sixlowpan
+
+  This configuration was intended only for unit-level testing of the
+  6loWPAN stack.  It enables networking with 6loWPAN support and uses
+  only a IEEE802.15.4 MAC loopback network device to supported testing.
+
 touchscreen
 
   This configuration uses the simple touchscreen test at
diff --git a/configs/sim/sixlowpan/Make.defs b/configs/sim/sixlowpan/Make.defs
new file mode 100644
index 0000000000..f2a7938575
--- /dev/null
+++ b/configs/sim/sixlowpan/Make.defs
@@ -0,0 +1,128 @@
+############################################################################
+# configs/sim/sixlowpan/Make.defs
+#
+#   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# 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 NuttX 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 OWNER 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.
+#
+############################################################################
+
+include ${TOPDIR}/.config
+include ${TOPDIR}/tools/Config.mk
+
+HOSTOS			= ${shell uname -o 2>/dev/null || echo "Other"}
+
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  ARCHOPTIMIZATION	= -g
+endif
+
+ifneq ($(CONFIG_DEBUG_NOOPT),y)
+  ARCHOPTIMIZATION	+= -O2
+endif
+
+ARCHCPUFLAGS		= -fno-builtin
+ARCHCPUFLAGSXX		= -fno-builtin -fno-exceptions -fcheck-new -fno-rtti
+ARCHPICFLAGS		= -fpic
+ARCHWARNINGS		= -Wall -Wstrict-prototypes -Wshadow -Wundef
+ARCHWARNINGSXX		= -Wall -Wshadow -Wundef
+ARCHDEFINES		=
+ARCHINCLUDES		= -I. -isystem $(TOPDIR)/include
+ARCHINCLUDESXX		= -I. -isystem $(TOPDIR)/include -isystem $(TOPDIR)/include/cxx
+ARCHSCRIPT		=
+
+ifeq ($(CONFIG_SIM_M32),y)
+  ARCHCPUFLAGS		+= -m32
+  ARCHCPUFLAGSXX	+= -m32
+endif
+
+CROSSDEV		=
+CC			= $(CROSSDEV)gcc
+CXX			= $(CROSSDEV)g++
+CPP			= $(CROSSDEV)gcc -E
+LD			= $(CROSSDEV)ld
+AR			= $(CROSSDEV)ar rcs
+NM			= $(CROSSDEV)nm
+OBJCOPY			= $(CROSSDEV)objcopy
+OBJDUMP			= $(CROSSDEV)objdump
+
+CFLAGS			= $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
+			  $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CXXFLAGS		= $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) \
+			  $(ARCHCPUFLAGSXX) $(ARCHINCLUDESXX) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CPPFLAGS		= $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES)
+AFLAGS			= $(CFLAGS) -D__ASSEMBLY__
+
+
+# ELF module definitions
+
+CELFFLAGS = $(CFLAGS)
+CXXELFFLAGS = $(CXXFLAGS)
+
+LDELFFLAGS = -r -e main
+ifeq ($(WINTOOL),y)
+  LDELFFLAGS += -T "${shell cygpath -w $(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/gnu-elf.ld}"
+else
+  LDELFFLAGS += -T $(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/gnu-elf.ld
+endif
+
+
+ASMEXT			= .S
+OBJEXT			= .o
+LIBEXT			= .a
+
+ifeq ($(HOSTOS),Cygwin)
+  EXEEXT		= .exe
+else
+  EXEEXT		=
+endif
+
+LDLINKFLAGS		= $(ARCHSCRIPT)	# Link flags used with $(LD)
+CCLINKFLAGS		= $(ARCHSCRIPT)	# Link flags used with $(CC)
+LDFLAGS			= $(ARCHSCRIPT)	# For backward compatibility, same as CCLINKFLAGS
+
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  LDLINKFLAGS		+= -g
+  CCLINKFLAGS		+= -g
+  LDFLAGS			+= -g
+endif
+
+ifeq ($(CONFIG_SIM_M32),y)
+  LDLINKFLAGS		+= -melf_i386
+  CCLINKFLAGS		+= -m32
+  LDFLAGS			+= -m32
+endif
+
+
+MKDEP			= $(TOPDIR)/tools/mkdeps$(HOSTEXEEXT)
+
+HOSTCC			= gcc
+HOSTINCLUDES		= -I.
+HOSTCFLAGS		= $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
+			  $(ARCHCPUFLAGS) $(HOSTINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+HOSTLDFLAGS		=
diff --git a/configs/sim/sixlowpan/defconfig b/configs/sim/sixlowpan/defconfig
new file mode 100644
index 0000000000..adf330024f
--- /dev/null
+++ b/configs/sim/sixlowpan/defconfig
@@ -0,0 +1,1175 @@
+#
+# Automatically generated file; DO NOT EDIT.
+# Nuttx/ Configuration
+#
+
+#
+# Build Setup
+#
+CONFIG_EXPERIMENTAL=y
+# CONFIG_DEFAULT_SMALL is not set
+# CONFIG_HOST_LINUX is not set
+# CONFIG_HOST_OSX is not set
+CONFIG_HOST_WINDOWS=y
+# CONFIG_HOST_OTHER is not set
+CONFIG_TOOLCHAIN_WINDOWS=y
+# CONFIG_WINDOWS_NATIVE is not set
+CONFIG_WINDOWS_CYGWIN=y
+# CONFIG_WINDOWS_UBUNTU is not set
+# CONFIG_WINDOWS_MSYS is not set
+# CONFIG_WINDOWS_OTHER is not set
+
+#
+# Build Configuration
+#
+# CONFIG_APPS_DIR="../apps"
+CONFIG_BUILD_FLAT=y
+# CONFIG_BUILD_2PASS is not set
+
+#
+# Binary Output Formats
+#
+# CONFIG_RRLOAD_BINARY is not set
+# CONFIG_INTELHEX_BINARY is not set
+# CONFIG_MOTOROLA_SREC is not set
+CONFIG_RAW_BINARY=y
+# CONFIG_UBOOT_UIMAGE is not set
+
+#
+# Customize Header Files
+#
+# CONFIG_ARCH_STDINT_H is not set
+# CONFIG_ARCH_STDBOOL_H is not set
+# CONFIG_ARCH_MATH_H is not set
+# CONFIG_ARCH_FLOAT_H is not set
+# CONFIG_ARCH_STDARG_H is not set
+# CONFIG_ARCH_DEBUG_H is not set
+
+#
+# Debug Options
+#
+CONFIG_DEBUG_ALERT=y
+# CONFIG_DEBUG_FEATURES is not set
+# CONFIG_ARCH_HAVE_STACKCHECK is not set
+# CONFIG_ARCH_HAVE_HEAPCHECK is not set
+CONFIG_DEBUG_SYMBOLS=y
+# CONFIG_ARCH_HAVE_CUSTOMOPT is not set
+CONFIG_DEBUG_NOOPT=y
+# CONFIG_DEBUG_FULLOPT is not set
+
+#
+# System Type
+#
+# CONFIG_ARCH_ARM is not set
+# CONFIG_ARCH_AVR is not set
+# CONFIG_ARCH_HC is not set
+# CONFIG_ARCH_MIPS is not set
+# CONFIG_ARCH_MISOC is not set
+# CONFIG_ARCH_RENESAS is not set
+# CONFIG_ARCH_RISCV is not set
+CONFIG_ARCH_SIM=y
+# CONFIG_ARCH_X86 is not set
+# CONFIG_ARCH_XTENSA is not set
+# CONFIG_ARCH_Z16 is not set
+# CONFIG_ARCH_Z80 is not set
+CONFIG_ARCH="sim"
+
+#
+# Simulation Configuration Options
+#
+CONFIG_HOST_X86_64=y
+# CONFIG_HOST_X86 is not set
+# CONFIG_SIM_M32 is not set
+# CONFIG_SIM_CYGWIN_DECORATED is not set
+# CONFIG_SIM_X8664_SYSTEMV is not set
+CONFIG_SIM_X8664_MICROSOFT=y
+# CONFIG_SIM_WALLTIME is not set
+# CONFIG_SIM_NETDEV is not set
+# CONFIG_SIM_FRAMEBUFFER is not set
+# CONFIG_SIM_SPIFLASH is not set
+# CONFIG_SIM_QSPIFLASH is not set
+
+#
+# Architecture Options
+#
+# CONFIG_ARCH_NOINTC is not set
+# CONFIG_ARCH_VECNOTIRQ is not set
+# CONFIG_ARCH_DMA is not set
+# CONFIG_ARCH_HAVE_IRQPRIO is not set
+# CONFIG_ARCH_L2CACHE is not set
+# CONFIG_ARCH_HAVE_COHERENT_DCACHE is not set
+# CONFIG_ARCH_HAVE_ADDRENV is not set
+# CONFIG_ARCH_NEED_ADDRENV_MAPPING is not set
+CONFIG_ARCH_HAVE_MULTICPU=y
+# CONFIG_ARCH_HAVE_VFORK is not set
+# CONFIG_ARCH_HAVE_MMU is not set
+# CONFIG_ARCH_HAVE_MPU is not set
+# CONFIG_ARCH_NAND_HWECC is not set
+# CONFIG_ARCH_HAVE_EXTCLK is not set
+CONFIG_ARCH_HAVE_POWEROFF=y
+# CONFIG_ARCH_HAVE_RESET is not set
+CONFIG_ARCH_STACKDUMP=y
+# CONFIG_ENDIAN_BIG is not set
+# CONFIG_ARCH_IDLE_CUSTOM is not set
+# CONFIG_ARCH_HAVE_RAMFUNCS is not set
+# CONFIG_ARCH_HAVE_RAMVECTORS is not set
+# CONFIG_ARCH_MINIMAL_VECTORTABLE is not set
+
+#
+# Board Settings
+#
+CONFIG_BOARD_LOOPSPERMSEC=51262
+# CONFIG_ARCH_CALIBRATION is not set
+
+#
+# Interrupt options
+#
+# CONFIG_ARCH_HAVE_INTERRUPTSTACK is not set
+# CONFIG_ARCH_HAVE_HIPRI_INTERRUPT is not set
+
+#
+# Boot options
+#
+# CONFIG_BOOT_RUNFROMEXTSRAM is not set
+CONFIG_BOOT_RUNFROMFLASH=y
+# CONFIG_BOOT_RUNFROMISRAM is not set
+# CONFIG_BOOT_RUNFROMSDRAM is not set
+# CONFIG_BOOT_COPYTORAM is not set
+
+#
+# Boot Memory Configuration
+#
+CONFIG_RAM_START=0x20400000
+CONFIG_RAM_SIZE=393216
+# CONFIG_ARCH_HAVE_SDRAM is not set
+
+#
+# Board Selection
+#
+CONFIG_ARCH_BOARD_SIM=y
+# CONFIG_ARCH_BOARD_CUSTOM is not set
+CONFIG_ARCH_BOARD="sim"
+
+#
+# Common Board Options
+#
+
+#
+# Board-Specific Options
+#
+# CONFIG_BOARD_CRASHDUMP is not set
+CONFIG_LIB_BOARDCTL=y
+CONFIG_BOARDCTL_POWEROFF=y
+# CONFIG_BOARDCTL_UNIQUEID is not set
+# CONFIG_BOARDCTL_TSCTEST is not set
+# CONFIG_BOARDCTL_GRAPHICS is not set
+# CONFIG_BOARDCTL_IOCTL is not set
+
+#
+# RTOS Features
+#
+CONFIG_DISABLE_OS_API=y
+# CONFIG_DISABLE_POSIX_TIMERS is not set
+# CONFIG_DISABLE_PTHREAD is not set
+# CONFIG_DISABLE_SIGNALS is not set
+# CONFIG_DISABLE_MQUEUE is not set
+# CONFIG_DISABLE_ENVIRON is not set
+
+#
+# Clocks and Timers
+#
+CONFIG_ARCH_HAVE_TICKLESS=y
+# CONFIG_SCHED_TICKLESS is not set
+CONFIG_USEC_PER_TICK=10000
+# CONFIG_SYSTEM_TIME64 is not set
+# CONFIG_CLOCK_MONOTONIC is not set
+# CONFIG_ARCH_HAVE_TIMEKEEPING is not set
+# CONFIG_JULIAN_TIME is not set
+CONFIG_START_YEAR=2014
+CONFIG_START_MONTH=3
+CONFIG_START_DAY=10
+CONFIG_MAX_WDOGPARMS=2
+CONFIG_PREALLOC_WDOGS=32
+CONFIG_WDOG_INTRESERVE=4
+CONFIG_PREALLOC_TIMERS=4
+
+#
+# Tasks and Scheduling
+#
+# CONFIG_SPINLOCK is not set
+# CONFIG_SMP is not set
+# CONFIG_INIT_NONE is not set
+CONFIG_INIT_ENTRYPOINT=y
+# CONFIG_INIT_FILEPATH is not set
+CONFIG_USER_ENTRYPOINT="nsh_main"
+CONFIG_RR_INTERVAL=200
+# CONFIG_SCHED_SPORADIC is not set
+CONFIG_TASK_NAME_SIZE=31
+CONFIG_MAX_TASKS=16
+# CONFIG_SCHED_HAVE_PARENT is not set
+CONFIG_SCHED_WAITPID=y
+
+#
+# Pthread Options
+#
+# CONFIG_PTHREAD_MUTEX_TYPES is not set
+CONFIG_PTHREAD_MUTEX_ROBUST=y
+# CONFIG_PTHREAD_MUTEX_UNSAFE is not set
+# CONFIG_PTHREAD_MUTEX_BOTH is not set
+CONFIG_NPTHREAD_KEYS=4
+# CONFIG_PTHREAD_CLEANUP is not set
+# CONFIG_CANCELLATION_POINTS is not set
+
+#
+# Performance Monitoring
+#
+# CONFIG_SCHED_CPULOAD is not set
+# CONFIG_SCHED_INSTRUMENTATION is not set
+
+#
+# Files and I/O
+#
+CONFIG_DEV_CONSOLE=y
+# CONFIG_FDCLONE_DISABLE is not set
+# CONFIG_FDCLONE_STDIO is not set
+CONFIG_SDCLONE_DISABLE=y
+CONFIG_NFILE_DESCRIPTORS=8
+CONFIG_NFILE_STREAMS=8
+CONFIG_NAME_MAX=32
+# CONFIG_PRIORITY_INHERITANCE is not set
+
+#
+# RTOS hooks
+#
+# CONFIG_BOARD_INITIALIZE is not set
+# CONFIG_SCHED_STARTHOOK is not set
+# CONFIG_SCHED_ATEXIT is not set
+# CONFIG_SCHED_ONEXIT is not set
+# CONFIG_SIG_EVTHREAD is not set
+
+#
+# Signal Numbers
+#
+CONFIG_SIG_SIGUSR1=1
+CONFIG_SIG_SIGUSR2=2
+CONFIG_SIG_SIGALARM=3
+CONFIG_SIG_SIGCONDTIMEDOUT=16
+CONFIG_SIG_SIGWORK=17
+
+#
+# POSIX Message Queue Options
+#
+CONFIG_PREALLOC_MQ_MSGS=4
+CONFIG_MQ_MAXMSGSIZE=32
+# CONFIG_MODULE is not set
+
+#
+# Work queue support
+#
+CONFIG_SCHED_WORKQUEUE=y
+CONFIG_SCHED_HPWORK=y
+CONFIG_SCHED_HPWORKPRIORITY=224
+CONFIG_SCHED_HPWORKPERIOD=50000
+CONFIG_SCHED_HPWORKSTACKSIZE=4096
+# CONFIG_SCHED_LPWORK is not set
+
+#
+# Stack and heap information
+#
+CONFIG_IDLETHREAD_STACKSIZE=4096
+CONFIG_USERMAIN_STACKSIZE=8192
+CONFIG_PTHREAD_STACK_MIN=256
+CONFIG_PTHREAD_STACK_DEFAULT=4096
+# CONFIG_LIB_SYSCALL is not set
+
+#
+# Device Drivers
+#
+CONFIG_DISABLE_POLL=y
+CONFIG_DEV_NULL=y
+# CONFIG_DEV_ZERO is not set
+# CONFIG_DEV_URANDOM is not set
+# CONFIG_DEV_LOOP is not set
+
+#
+# Buffering
+#
+# CONFIG_DRVR_WRITEBUFFER is not set
+# CONFIG_DRVR_READAHEAD is not set
+# CONFIG_RAMDISK is not set
+# CONFIG_CAN is not set
+# CONFIG_ARCH_HAVE_PWM_PULSECOUNT is not set
+# CONFIG_ARCH_HAVE_PWM_MULTICHAN is not set
+# CONFIG_PWM is not set
+# CONFIG_ARCH_HAVE_I2CRESET is not set
+CONFIG_I2C=y
+# CONFIG_I2C_SLAVE is not set
+# CONFIG_I2C_POLLED is not set
+# CONFIG_I2C_TRACE is not set
+CONFIG_I2C_DRIVER=y
+# CONFIG_ARCH_HAVE_SPI_CRCGENERATION is not set
+# CONFIG_ARCH_HAVE_SPI_CS_CONTROL is not set
+# CONFIG_ARCH_HAVE_SPI_BITORDER is not set
+CONFIG_SPI=y
+# CONFIG_SPI_SLAVE is not set
+CONFIG_SPI_EXCHANGE=y
+# CONFIG_SPI_CMDDATA is not set
+# CONFIG_SPI_CALLBACK is not set
+# CONFIG_SPI_HWFEATURES is not set
+# CONFIG_SPI_CS_DELAY_CONTROL is not set
+# CONFIG_SPI_DRIVER is not set
+# CONFIG_SPI_BITBANG is not set
+# CONFIG_I2S is not set
+
+#
+# Timer Driver Support
+#
+# CONFIG_TIMER is not set
+# CONFIG_ONESHOT is not set
+# CONFIG_RTC is not set
+# CONFIG_WATCHDOG is not set
+# CONFIG_TIMERS_CS2100CP is not set
+# CONFIG_ANALOG is not set
+# CONFIG_AUDIO_DEVICES is not set
+# CONFIG_VIDEO_DEVICES is not set
+# CONFIG_BCH is not set
+# CONFIG_INPUT is not set
+
+#
+# IO Expander/GPIO Support
+#
+# CONFIG_IOEXPANDER is not set
+# CONFIG_DEV_GPIO is not set
+
+#
+# LCD Driver Support
+#
+# CONFIG_LCD is not set
+# CONFIG_SLCD is not set
+
+#
+# LED Support
+#
+# CONFIG_RGBLED is not set
+# CONFIG_PCA9635PW is not set
+# CONFIG_NCP5623C is not set
+CONFIG_MMCSD=y
+CONFIG_MMCSD_NSLOTS=1
+# CONFIG_MMCSD_READONLY is not set
+CONFIG_MMCSD_MULTIBLOCK_DISABLE=y
+# CONFIG_MMCSD_MMCSUPPORT is not set
+CONFIG_MMCSD_HAVECARDDETECT=y
+# CONFIG_MMCSD_SPI is not set
+# CONFIG_ARCH_HAVE_SDIO is not set
+# CONFIG_SDIO_DMA is not set
+# CONFIG_ARCH_HAVE_SDIOWAIT_WRCOMPLETE is not set
+# CONFIG_MODEM is not set
+CONFIG_MTD=y
+
+#
+# MTD Configuration
+#
+# CONFIG_MTD_PARTITION is not set
+# CONFIG_MTD_SECT512 is not set
+# CONFIG_MTD_BYTE_WRITE is not set
+# CONFIG_MTD_PROGMEM is not set
+CONFIG_MTD_CONFIG=y
+# CONFIG_MTD_CONFIG_RAM_CONSOLIDATE is not set
+CONFIG_MTD_CONFIG_ERASEDVALUE=0xff
+
+#
+# MTD Device Drivers
+#
+# CONFIG_MTD_NAND is not set
+# CONFIG_RAMMTD is not set
+# CONFIG_FILEMTD is not set
+CONFIG_MTD_AT24XX=y
+# CONFIG_AT24XX_MULTI is not set
+CONFIG_AT24XX_SIZE=2
+CONFIG_AT24XX_ADDR=0x57
+CONFIG_AT24XX_EXTENDED=y
+CONFIG_AT24XX_EXTSIZE=160
+CONFIG_AT24XX_FREQUENCY=100000
+CONFIG_MTD_AT25=y
+CONFIG_AT25_SPIMODE=0
+CONFIG_AT25_SPIFREQUENCY=20000000
+# CONFIG_MTD_AT45DB is not set
+# CONFIG_MTD_IS25XP is not set
+# CONFIG_MTD_M25P is not set
+# CONFIG_MTD_MX25L is not set
+# CONFIG_MTD_S25FL1 is not set
+# CONFIG_MTD_N25QXXX is not set
+# CONFIG_MTD_SMART is not set
+# CONFIG_MTD_RAMTRON is not set
+# CONFIG_MTD_SST25 is not set
+# CONFIG_MTD_SST25XX is not set
+# CONFIG_MTD_SST26 is not set
+# CONFIG_MTD_SST39FV is not set
+# CONFIG_MTD_W25 is not set
+# CONFIG_EEPROM is not set
+CONFIG_NETDEVICES=y
+
+#
+# General Ethernet MAC Driver Options
+#
+# CONFIG_NETDEV_LOOPBACK is not set
+CONFIG_NETDEV_TELNET=y
+CONFIG_TELNET_RXBUFFER_SIZE=256
+CONFIG_TELNET_TXBUFFER_SIZE=256
+CONFIG_NETDEV_MULTINIC=y
+CONFIG_ARCH_HAVE_NETDEV_STATISTICS=y
+CONFIG_NETDEV_STATISTICS=y
+# CONFIG_NETDEV_LATEINIT is not set
+
+#
+# External Ethernet MAC Device Support
+#
+# CONFIG_NET_DM90x0 is not set
+# CONFIG_NET_CS89x0 is not set
+# CONFIG_ENC28J60 is not set
+# CONFIG_ENCX24J600 is not set
+# CONFIG_NET_SLIP is not set
+# CONFIG_NET_FTMAC100 is not set
+# CONFIG_PIPES is not set
+# CONFIG_PM is not set
+# CONFIG_POWER is not set
+# CONFIG_SENSORS is not set
+CONFIG_SERIAL=y
+# CONFIG_DEV_LOWCONSOLE is not set
+# CONFIG_SERIAL_REMOVABLE is not set
+CONFIG_SERIAL_CONSOLE=y
+# CONFIG_16550_UART is not set
+# CONFIG_UART_SERIALDRIVER is not set
+# CONFIG_UART0_SERIALDRIVER is not set
+# CONFIG_UART1_SERIALDRIVER is not set
+# CONFIG_UART2_SERIALDRIVER is not set
+# CONFIG_UART3_SERIALDRIVER is not set
+# CONFIG_UART4_SERIALDRIVER is not set
+# CONFIG_UART5_SERIALDRIVER is not set
+# CONFIG_UART6_SERIALDRIVER is not set
+# CONFIG_UART7_SERIALDRIVER is not set
+# CONFIG_UART8_SERIALDRIVER is not set
+# CONFIG_SCI0_SERIALDRIVER is not set
+# CONFIG_SCI1_SERIALDRIVER is not set
+# CONFIG_USART0_SERIALDRIVER is not set
+# CONFIG_USART1_SERIALDRIVER is not set
+# CONFIG_USART2_SERIALDRIVER is not set
+# CONFIG_USART3_SERIALDRIVER is not set
+# CONFIG_USART4_SERIALDRIVER is not set
+# CONFIG_USART5_SERIALDRIVER is not set
+# CONFIG_USART6_SERIALDRIVER is not set
+# CONFIG_USART7_SERIALDRIVER is not set
+# CONFIG_USART8_SERIALDRIVER is not set
+# CONFIG_OTHER_UART_SERIALDRIVER is not set
+# CONFIG_MCU_SERIAL is not set
+CONFIG_STANDARD_SERIAL=y
+# CONFIG_SERIAL_IFLOWCONTROL is not set
+# CONFIG_SERIAL_OFLOWCONTROL is not set
+# CONFIG_SERIAL_DMA is not set
+# CONFIG_ARCH_HAVE_SERIAL_TERMIOS is not set
+# CONFIG_PSEUDOTERM is not set
+# CONFIG_USBDEV is not set
+# CONFIG_USBHOST is not set
+# CONFIG_USBMISC is not set
+# CONFIG_HAVE_USBTRACE is not set
+# CONFIG_DRIVERS_WIRELESS is not set
+# CONFIG_DRIVERS_CONTACTLESS is not set
+
+#
+# System Logging
+#
+# CONFIG_ARCH_SYSLOG is not set
+# CONFIG_RAMLOG is not set
+# CONFIG_SYSLOG_INTBUFFER is not set
+# CONFIG_SYSLOG_TIMESTAMP is not set
+CONFIG_SYSLOG_SERIAL_CONSOLE=y
+# CONFIG_SYSLOG_CHAR is not set
+CONFIG_SYSLOG_CONSOLE=y
+# CONFIG_SYSLOG_NONE is not set
+# CONFIG_SYSLOG_FILE is not set
+# CONFIG_SYSLOG_CHARDEV is not set
+
+#
+# Networking Support
+#
+CONFIG_ARCH_HAVE_NET=y
+# CONFIG_ARCH_HAVE_PHY is not set
+CONFIG_NET=y
+# CONFIG_NET_PROMISCUOUS is not set
+
+#
+# Driver buffer configuration
+#
+CONFIG_NET_GUARDSIZE=2
+
+#
+# Data link support
+#
+# CONFIG_NET_MULTILINK is not set
+# CONFIG_NET_USER_DEVFMT is not set
+# CONFIG_NET_ETHERNET is not set
+CONFIG_NET_6LOWPAN=y
+# CONFIG_NET_LOOPBACK is not set
+# CONFIG_NET_TUN is not set
+# CONFIG_NET_USRSOCK is not set
+
+#
+# Network Device Operations
+#
+CONFIG_NETDEV_IOCTL=y
+CONFIG_NETDEV_PHY_IOCTL=y
+
+#
+# Internet Protocol Selection
+#
+# CONFIG_NET_IPv4 is not set
+CONFIG_NET_IPv6=y
+CONFIG_NET_IPv6_NCONF_ENTRIES=8
+CONFIG_NET_6LOWPAN_FRAG=y
+CONFIG_NET_6LOWPAN_FRAMELEN=127
+# CONFIG_NET_6LOWPAN_COMPRESSION_IPv6 is not set
+# CONFIG_NET_6LOWPAN_COMPRESSION_HC1 is not set
+CONFIG_NET_6LOWPAN_COMPRESSION_HC06=y
+CONFIG_NET_6LOWPAN_COMPRESSION_THRESHOLD=63
+CONFIG_NET_6LOWPAN_MAXADDRCONTEXT=1
+CONFIG_NET_6LOWPAN_MAXADDRCONTEXT_PREFIX_0_0=0xaa
+CONFIG_NET_6LOWPAN_MAXADDRCONTEXT_PREFIX_0_1=0xaa
+# CONFIG_NET_6LOWPAN_MAXADDRCONTEXT_PREINIT_1 is not set
+CONFIG_NET_6LOWPAN_RIMEADDR_SIZE=2
+CONFIG_NET_6LOWPAN_MAXAGE=20
+CONFIG_NET_6LOWPAN_MAX_MACTRANSMITS=4
+CONFIG_NET_6LOWPAN_MAXPAYLOAD=102
+CONFIG_NET_6LOWPAN_MTU=1294
+CONFIG_NET_6LOWPAN_TCP_RECVWNDO=102
+
+#
+# Socket Support
+#
+CONFIG_NSOCKET_DESCRIPTORS=8
+CONFIG_NET_NACTIVESOCKETS=16
+CONFIG_NET_SOCKOPTS=y
+# CONFIG_NET_SOLINGER is not set
+
+#
+# Raw Socket Support
+#
+# CONFIG_NET_PKT is not set
+
+#
+# Unix Domain Socket Support
+#
+# CONFIG_NET_LOCAL is not set
+
+#
+# TCP/IP Networking
+#
+CONFIG_NET_TCP=y
+# CONFIG_NET_TCP_NO_STACK is not set
+# CONFIG_NET_TCPURGDATA is not set
+# CONFIG_NET_TCP_REASSEMBLY is not set
+CONFIG_NET_TCP_CONNS=8
+CONFIG_NET_MAX_LISTENPORTS=20
+CONFIG_NET_TCP_READAHEAD=y
+CONFIG_NET_TCP_WRITE_BUFFERS=y
+CONFIG_NET_TCP_NWRBCHAINS=8
+CONFIG_NET_TCP_RECVDELAY=0
+CONFIG_NET_TCPBACKLOG=y
+# CONFIG_NET_SENDFILE is not set
+
+#
+# UDP Networking
+#
+CONFIG_NET_UDP=y
+# CONFIG_NET_UDP_NO_STACK is not set
+# CONFIG_NET_UDP_CHECKSUMS is not set
+CONFIG_NET_UDP_CONNS=8
+CONFIG_NET_BROADCAST=y
+# CONFIG_NET_RXAVAIL is not set
+CONFIG_NET_UDP_READAHEAD=y
+
+#
+# ICMPv6 Networking Support
+#
+# CONFIG_NET_ICMPv6 is not set
+
+#
+# IGMPv2 Client Support
+#
+# CONFIG_NET_IGMP is not set
+
+#
+# ARP Configuration
+#
+
+#
+# Network I/O Buffer Support
+#
+CONFIG_NET_IOB=y
+CONFIG_IOB_NBUFFERS=36
+CONFIG_IOB_BUFSIZE=196
+CONFIG_IOB_NCHAINS=8
+CONFIG_IOB_THROTTLE=8
+
+#
+# User-space networking stack API
+#
+# CONFIG_NET_ARCH_INCR32 is not set
+# CONFIG_NET_ARCH_CHKSUM is not set
+CONFIG_NET_STATISTICS=y
+
+#
+# Routing Table Configuration
+#
+# CONFIG_NET_ROUTE is not set
+CONFIG_NET_HOSTNAME="SAMV71-XULT"
+
+#
+# Crypto API
+#
+# CONFIG_CRYPTO is not set
+
+#
+# File Systems
+#
+
+#
+# File system configuration
+#
+# CONFIG_DISABLE_MOUNTPOINT is not set
+# CONFIG_FS_AUTOMOUNTER is not set
+# CONFIG_DISABLE_PSEUDOFS_OPERATIONS is not set
+# CONFIG_PSEUDOFS_SOFTLINKS is not set
+CONFIG_FS_READABLE=y
+CONFIG_FS_WRITABLE=y
+# CONFIG_FS_NAMED_SEMAPHORES is not set
+CONFIG_FS_MQUEUE_MPATH="/var/mqueue"
+# CONFIG_FS_RAMMAP is not set
+CONFIG_FS_FAT=y
+CONFIG_FAT_LCNAMES=y
+CONFIG_FAT_LFN=y
+CONFIG_FAT_MAXFNAME=32
+# CONFIG_FS_FATTIME is not set
+# CONFIG_FAT_FORCE_INDIRECT is not set
+# CONFIG_FAT_DMAMEMORY is not set
+# CONFIG_FAT_DIRECT_RETRY is not set
+# CONFIG_FS_NXFFS is not set
+# CONFIG_FS_ROMFS is not set
+# CONFIG_FS_TMPFS is not set
+# CONFIG_FS_SMARTFS is not set
+# CONFIG_FS_BINFS is not set
+CONFIG_FS_PROCFS=y
+# CONFIG_FS_PROCFS_REGISTER is not set
+
+#
+# Exclude individual procfs entries
+#
+# CONFIG_FS_PROCFS_EXCLUDE_PROCESS is not set
+# CONFIG_FS_PROCFS_EXCLUDE_UPTIME is not set
+# CONFIG_FS_PROCFS_EXCLUDE_MOUNTS is not set
+# CONFIG_FS_PROCFS_EXCLUDE_NET is not set
+# CONFIG_FS_PROCFS_EXCLUDE_MTD is not set
+# CONFIG_FS_UNIONFS is not set
+# CONFIG_FS_HOSTFS is not set
+
+#
+# Graphics Support
+#
+# CONFIG_NX is not set
+
+#
+# Memory Management
+#
+# CONFIG_MM_SMALL is not set
+CONFIG_MM_REGIONS=1
+# CONFIG_ARCH_HAVE_HEAP2 is not set
+# CONFIG_GRAN is not set
+
+#
+# Audio Support
+#
+# CONFIG_AUDIO is not set
+
+#
+# Wireless Support
+#
+CONFIG_WIRELESS=y
+CONFIG_WIRELESS_IEEE802154=y
+CONFIG_IEEE802154_LOOPBACK=y
+CONFIG_IEEE802154_LOOPBACK_HPWORK=y
+
+#
+# Binary Loader
+#
+# CONFIG_BINFMT_DISABLE is not set
+# CONFIG_BINFMT_EXEPATH is not set
+# CONFIG_NXFLAT is not set
+# CONFIG_ELF is not set
+CONFIG_BUILTIN=y
+# CONFIG_PIC is not set
+# CONFIG_SYMTAB_ORDEREDBYNAME is not set
+
+#
+# Library Routines
+#
+
+#
+# Standard C Library Options
+#
+
+#
+# Standard C I/O
+#
+# CONFIG_STDIO_DISABLE_BUFFERING is not set
+CONFIG_STDIO_BUFFER_SIZE=64
+CONFIG_STDIO_LINEBUFFER=y
+CONFIG_NUNGET_CHARS=2
+# CONFIG_NOPRINTF_FIELDWIDTH is not set
+# CONFIG_LIBC_FLOATINGPOINT is not set
+CONFIG_LIBC_LONG_LONG=y
+# CONFIG_LIBC_SCANSET is not set
+# CONFIG_EOL_IS_CR is not set
+# CONFIG_EOL_IS_LF is not set
+# CONFIG_EOL_IS_BOTH_CRLF is not set
+CONFIG_EOL_IS_EITHER_CRLF=y
+# CONFIG_MEMCPY_VIK is not set
+# CONFIG_LIBM is not set
+
+#
+# Architecture-Specific Support
+#
+CONFIG_ARCH_LOWPUTC=y
+# CONFIG_ARCH_ROMGETC is not set
+# CONFIG_LIBC_ARCH_MEMCPY is not set
+# CONFIG_LIBC_ARCH_MEMCMP is not set
+# CONFIG_LIBC_ARCH_MEMMOVE is not set
+# CONFIG_LIBC_ARCH_MEMSET is not set
+# CONFIG_LIBC_ARCH_STRCHR is not set
+# CONFIG_LIBC_ARCH_STRCMP is not set
+# CONFIG_LIBC_ARCH_STRCPY is not set
+# CONFIG_LIBC_ARCH_STRNCPY is not set
+# CONFIG_LIBC_ARCH_STRLEN is not set
+# CONFIG_LIBC_ARCH_STRNLEN is not set
+# CONFIG_LIBC_ARCH_ELF is not set
+
+#
+# stdlib Options
+#
+CONFIG_LIB_RAND_ORDER=1
+CONFIG_LIB_HOMEDIR="/"
+CONFIG_LIBC_TMPDIR="/tmp"
+CONFIG_LIBC_MAX_TMPFILE=32
+
+#
+# Program Execution Options
+#
+# CONFIG_LIBC_EXECFUNCS is not set
+CONFIG_POSIX_SPAWN_PROXY_STACKSIZE=2048
+CONFIG_TASK_SPAWN_DEFAULT_STACKSIZE=4096
+
+#
+# errno Decode Support
+#
+# CONFIG_LIBC_STRERROR is not set
+# CONFIG_LIBC_PERROR_STDOUT is not set
+
+#
+# memcpy/memset Options
+#
+# CONFIG_MEMSET_OPTSPEED is not set
+# CONFIG_LIBC_DLLFCN is not set
+# CONFIG_LIBC_MODLIB is not set
+# CONFIG_LIBC_WCHAR is not set
+# CONFIG_LIBC_LOCALE is not set
+
+#
+# Time/Time Zone Support
+#
+# CONFIG_LIBC_LOCALTIME is not set
+# CONFIG_TIME_EXTENDED is not set
+CONFIG_ARCH_HAVE_TLS=y
+
+#
+# Thread Local Storage (TLS)
+#
+# CONFIG_TLS is not set
+
+#
+# Network-Related Options
+#
+# CONFIG_LIBC_IPv4_ADDRCONV is not set
+CONFIG_LIBC_NETDB=y
+
+#
+# NETDB Support
+#
+# CONFIG_NETDB_HOSTFILE is not set
+CONFIG_NETDB_DNSCLIENT=y
+CONFIG_NETDB_DNSCLIENT_ENTRIES=8
+CONFIG_NETDB_DNSCLIENT_NAMESIZE=32
+CONFIG_NETDB_DNSCLIENT_LIFESEC=3600
+CONFIG_NETDB_DNSCLIENT_MAXRESPONSE=96
+# CONFIG_NETDB_RESOLVCONF is not set
+# CONFIG_NETDB_DNSSERVER_NOADDR is not set
+CONFIG_NETDB_DNSSERVER_IPv6=y
+CONFIG_NETDB_DNSSERVER_IPv6ADDR_1=0xfc00
+CONFIG_NETDB_DNSSERVER_IPv6ADDR_2=0x0000
+CONFIG_NETDB_DNSSERVER_IPv6ADDR_3=0x0000
+CONFIG_NETDB_DNSSERVER_IPv6ADDR_4=0x0000
+CONFIG_NETDB_DNSSERVER_IPv6ADDR_5=0x0000
+CONFIG_NETDB_DNSSERVER_IPv6ADDR_6=0x0000
+CONFIG_NETDB_DNSSERVER_IPv6ADDR_7=0x0000
+CONFIG_NETDB_DNSSERVER_IPv6ADDR_8=0x0001
+# CONFIG_LIBC_IOCTL_VARIADIC is not set
+CONFIG_LIB_SENDFILE_BUFSIZE=512
+
+#
+# Non-standard Library Support
+#
+# CONFIG_LIB_CRC64_FAST is not set
+# CONFIG_LIB_KBDCODEC is not set
+# CONFIG_LIB_SLCDCODEC is not set
+# CONFIG_LIB_HEX2BIN is not set
+
+#
+# Basic CXX Support
+#
+# CONFIG_C99_BOOL8 is not set
+# CONFIG_HAVE_CXX is not set
+
+#
+# Application Configuration
+#
+
+#
+# Built-In Applications
+#
+CONFIG_BUILTIN_PROXY_STACKSIZE=2048
+
+#
+# CAN Utilities
+#
+
+#
+# Examples
+#
+# CONFIG_EXAMPLES_CCTYPE is not set
+# CONFIG_EXAMPLES_CHAT is not set
+# CONFIG_EXAMPLES_CONFIGDATA is not set
+# CONFIG_EXAMPLES_DHCPD is not set
+# CONFIG_EXAMPLES_DISCOVER is not set
+# CONFIG_EXAMPLES_ELF is not set
+# CONFIG_EXAMPLES_FSTEST is not set
+# CONFIG_EXAMPLES_FTPC is not set
+# CONFIG_EXAMPLES_FTPD is not set
+# CONFIG_EXAMPLES_HELLO is not set
+# CONFIG_EXAMPLES_HIDKBD is not set
+# CONFIG_EXAMPLES_IGMP is not set
+# CONFIG_EXAMPLES_JSON is not set
+# CONFIG_EXAMPLES_KEYPADTEST is not set
+# CONFIG_EXAMPLES_MEDIA is not set
+# CONFIG_EXAMPLES_MM is not set
+# CONFIG_EXAMPLES_MODBUS is not set
+# CONFIG_EXAMPLES_MOUNT is not set
+CONFIG_EXAMPLES_NETTEST=y
+CONFIG_EXAMPLES_NETTEST_STACKSIZE=4096
+CONFIG_EXAMPLES_NETTEST_PRIORITY=100
+CONFIG_EXAMPLES_NETTEST_LOOPBACK=y
+CONFIG_EXAMPLES_NETTEST_SERVER_STACKSIZE=4096
+CONFIG_EXAMPLES_NETTEST_SERVER_PRIORITY=100
+# CONFIG_EXAMPLES_NETTEST_PERFORMANCE is not set
+CONFIG_EXAMPLES_NETTEST_IPv6=y
+
+#
+# Target IPv6 address
+#
+#
+# Client IPv6 address
+#
+CONFIG_EXAMPLES_NETTEST_CLIENTIPv6ADDR_1=0xfe80
+CONFIG_EXAMPLES_NETTEST_CLIENTIPv6ADDR_2=0x0000
+CONFIG_EXAMPLES_NETTEST_CLIENTIPv6ADDR_3=0x0000
+CONFIG_EXAMPLES_NETTEST_CLIENTIPv6ADDR_4=0x0000
+CONFIG_EXAMPLES_NETTEST_CLIENTIPv6ADDR_5=0x1234
+CONFIG_EXAMPLES_NETTEST_CLIENTIPv6ADDR_6=0x0000
+CONFIG_EXAMPLES_NETTEST_CLIENTIPv6ADDR_7=0x0000
+CONFIG_EXAMPLES_NETTEST_CLIENTIPv6ADDR_8=0x0000
+CONFIG_EXAMPLES_NSH=y
+# CONFIG_EXAMPLES_NULL is not set
+# CONFIG_EXAMPLES_NX is not set
+# CONFIG_EXAMPLES_NXFFS is not set
+# CONFIG_EXAMPLES_NXHELLO is not set
+# CONFIG_EXAMPLES_NXIMAGE is not set
+# CONFIG_EXAMPLES_NXLINES is not set
+# CONFIG_EXAMPLES_NXTERM is not set
+# CONFIG_EXAMPLES_NXTEXT is not set
+# CONFIG_EXAMPLES_OSTEST is not set
+# CONFIG_EXAMPLES_PCA9635 is not set
+# CONFIG_EXAMPLES_POSIXSPAWN is not set
+# CONFIG_EXAMPLES_PPPD is not set
+# CONFIG_EXAMPLES_RFID_READUID is not set
+# CONFIG_EXAMPLES_RGBLED is not set
+# CONFIG_EXAMPLES_SENDMAIL is not set
+# CONFIG_EXAMPLES_SERIALBLASTER is not set
+# CONFIG_EXAMPLES_SERIALRX is not set
+# CONFIG_EXAMPLES_SERLOOP is not set
+# CONFIG_EXAMPLES_SLCD is not set
+# CONFIG_EXAMPLES_SMART is not set
+# CONFIG_EXAMPLES_SMART_TEST is not set
+# CONFIG_EXAMPLES_SMP is not set
+# CONFIG_EXAMPLES_STAT is not set
+# CONFIG_EXAMPLES_TCPECHO is not set
+# CONFIG_EXAMPLES_TELNETD is not set
+# CONFIG_EXAMPLES_TIFF is not set
+# CONFIG_EXAMPLES_TOUCHSCREEN is not set
+# CONFIG_EXAMPLES_UDP is not set
+# CONFIG_EXAMPLES_UDPBLASTER is not set
+# CONFIG_EXAMPLES_USBSERIAL is not set
+# CONFIG_EXAMPLES_WATCHDOG is not set
+# CONFIG_EXAMPLES_WEBSERVER is not set
+# CONFIG_EXAMPLES_XBC_TEST is not set
+
+#
+# File System Utilities
+#
+# CONFIG_FSUTILS_FLASH_ERASEALL is not set
+# CONFIG_FSUTILS_INIFILE is not set
+# CONFIG_FSUTILS_PASSWD is not set
+
+#
+# GPS Utilities
+#
+# CONFIG_GPSUTILS_MINMEA_LIB is not set
+
+#
+# Graphics Support
+#
+# CONFIG_TIFF is not set
+# CONFIG_GRAPHICS_TRAVELER is not set
+
+#
+# Interpreters
+#
+# CONFIG_INTERPRETERS_BAS is not set
+# CONFIG_INTERPRETERS_FICL is not set
+# CONFIG_INTERPRETERS_MICROPYTHON is not set
+# CONFIG_INTERPRETERS_MINIBASIC is not set
+# CONFIG_INTERPRETERS_PCODE is not set
+
+#
+# FreeModBus
+#
+# CONFIG_MODBUS is not set
+
+#
+# Network Utilities
+#
+# CONFIG_NETUTILS_CODECS is not set
+# CONFIG_NETUTILS_DISCOVER is not set
+# CONFIG_NETUTILS_ESP8266 is not set
+# CONFIG_NETUTILS_FTPC is not set
+# CONFIG_NETUTILS_JSON is not set
+CONFIG_NETUTILS_NETLIB=y
+# CONFIG_NETUTILS_NTPCLIENT is not set
+# CONFIG_NETUTILS_PPPD is not set
+# CONFIG_NETUTILS_SMTP is not set
+# CONFIG_NETUTILS_TELNETD is not set
+# CONFIG_NETUTILS_TFTPC is not set
+# CONFIG_NETUTILS_WEBCLIENT is not set
+# CONFIG_NETUTILS_WEBSERVER is not set
+# CONFIG_NETUTILS_XMLRPC is not set
+
+#
+# NSH Library
+#
+CONFIG_NSH_LIBRARY=y
+# CONFIG_NSH_MOTD is not set
+
+#
+# Command Line Configuration
+#
+CONFIG_NSH_READLINE=y
+# CONFIG_NSH_CLE is not set
+CONFIG_NSH_LINELEN=64
+# CONFIG_NSH_DISABLE_SEMICOLON is not set
+CONFIG_NSH_CMDPARMS=y
+CONFIG_NSH_MAXARGUMENTS=6
+CONFIG_NSH_ARGCAT=y
+CONFIG_NSH_NESTDEPTH=3
+# CONFIG_NSH_DISABLEBG is not set
+CONFIG_NSH_BUILTIN_APPS=y
+
+#
+# Disable Individual commands
+#
+# CONFIG_NSH_DISABLE_ADDROUTE is not set
+# CONFIG_NSH_DISABLE_BASENAME is not set
+# CONFIG_NSH_DISABLE_CAT is not set
+# CONFIG_NSH_DISABLE_CD is not set
+# CONFIG_NSH_DISABLE_CP is not set
+# CONFIG_NSH_DISABLE_CMP is not set
+CONFIG_NSH_DISABLE_DATE=y
+# CONFIG_NSH_DISABLE_DD is not set
+# CONFIG_NSH_DISABLE_DF is not set
+# CONFIG_NSH_DISABLE_DELROUTE is not set
+# CONFIG_NSH_DISABLE_DIRNAME is not set
+# CONFIG_NSH_DISABLE_ECHO is not set
+# CONFIG_NSH_DISABLE_EXEC is not set
+# CONFIG_NSH_DISABLE_EXIT is not set
+# CONFIG_NSH_DISABLE_FREE is not set
+# CONFIG_NSH_DISABLE_GET is not set
+# CONFIG_NSH_DISABLE_HELP is not set
+# CONFIG_NSH_DISABLE_HEXDUMP is not set
+# CONFIG_NSH_DISABLE_IFCONFIG is not set
+# CONFIG_NSH_DISABLE_IFUPDOWN is not set
+# CONFIG_NSH_DISABLE_KILL is not set
+# CONFIG_NSH_DISABLE_LOSETUP is not set
+CONFIG_NSH_DISABLE_LOSMART=y
+# CONFIG_NSH_DISABLE_LS is not set
+# CONFIG_NSH_DISABLE_MB is not set
+# CONFIG_NSH_DISABLE_MKDIR is not set
+# CONFIG_NSH_DISABLE_MKFATFS is not set
+# CONFIG_NSH_DISABLE_MKRD is not set
+# CONFIG_NSH_DISABLE_MH is not set
+# CONFIG_NSH_DISABLE_MOUNT is not set
+# CONFIG_NSH_DISABLE_MV is not set
+# CONFIG_NSH_DISABLE_MW is not set
+# CONFIG_NSH_DISABLE_NSLOOKUP is not set
+# CONFIG_NSH_DISABLE_POWEROFF is not set
+CONFIG_NSH_DISABLE_PRINTF=y
+# CONFIG_NSH_DISABLE_PS is not set
+# CONFIG_NSH_DISABLE_PUT is not set
+# CONFIG_NSH_DISABLE_PWD is not set
+# CONFIG_NSH_DISABLE_RM is not set
+# CONFIG_NSH_DISABLE_RMDIR is not set
+# CONFIG_NSH_DISABLE_SET is not set
+# CONFIG_NSH_DISABLE_SH is not set
+CONFIG_NSH_DISABLE_SHUTDOWN=y
+# CONFIG_NSH_DISABLE_SLEEP is not set
+# CONFIG_NSH_DISABLE_TIME is not set
+# CONFIG_NSH_DISABLE_TEST is not set
+# CONFIG_NSH_DISABLE_UMOUNT is not set
+# CONFIG_NSH_DISABLE_UNAME is not set
+# CONFIG_NSH_DISABLE_UNSET is not set
+# CONFIG_NSH_DISABLE_USLEEP is not set
+# CONFIG_NSH_DISABLE_WGET is not set
+# CONFIG_NSH_DISABLE_XD is not set
+CONFIG_NSH_MMCSDMINOR=0
+CONFIG_NSH_MMCSDSLOTNO=0
+
+#
+# Configure Command Options
+#
+# CONFIG_NSH_CMDOPT_DF_H is not set
+# CONFIG_NSH_CMDOPT_DD_STATS is not set
+CONFIG_NSH_CODECS_BUFSIZE=128
+CONFIG_NSH_CMDOPT_HEXDUMP=y
+CONFIG_NSH_PROC_MOUNTPOINT="/proc"
+CONFIG_NSH_FILEIOSIZE=512
+
+#
+# Scripting Support
+#
+# CONFIG_NSH_DISABLESCRIPT is not set
+# CONFIG_NSH_DISABLE_ITEF is not set
+# CONFIG_NSH_DISABLE_LOOPS is not set
+
+#
+# Console Configuration
+#
+CONFIG_NSH_CONSOLE=y
+# CONFIG_NSH_ALTCONDEV is not set
+CONFIG_NSH_ARCHINIT=y
+
+#
+# Networking Configuration
+#
+CONFIG_NSH_NETINIT=y
+# CONFIG_NSH_NETINIT_THREAD is not set
+
+#
+# IP Address Configuration
+#
+
+#
+# Target IPv6 address
+#
+CONFIG_NSH_IPv6ADDR_1=0xfe80
+CONFIG_NSH_IPv6ADDR_2=0x0000
+CONFIG_NSH_IPv6ADDR_3=0x0000
+CONFIG_NSH_IPv6ADDR_4=0x0000
+CONFIG_NSH_IPv6ADDR_5=0xabcd
+CONFIG_NSH_IPv6ADDR_6=0x0000
+CONFIG_NSH_IPv6ADDR_7=0x0000
+CONFIG_NSH_IPv6ADDR_8=0x0000
+
+#
+# Router IPv6 address
+#
+CONFIG_NSH_DRIPv6ADDR_1=0xfe80
+CONFIG_NSH_DRIPv6ADDR_2=0x0000
+CONFIG_NSH_DRIPv6ADDR_3=0x0000
+CONFIG_NSH_DRIPv6ADDR_4=0x0000
+CONFIG_NSH_DRIPv6ADDR_5=0x1234
+CONFIG_NSH_DRIPv6ADDR_6=0x0000
+CONFIG_NSH_DRIPv6ADDR_7=0x0000
+CONFIG_NSH_DRIPv6ADDR_8=0x0000
+
+#
+# IPv6 Network mask
+#
+CONFIG_NSH_IPv6NETMASK_1=0xffff
+CONFIG_NSH_IPv6NETMASK_2=0xffff
+CONFIG_NSH_IPv6NETMASK_3=0xffff
+CONFIG_NSH_IPv6NETMASK_4=0xffff
+CONFIG_NSH_IPv6NETMASK_5=0x0000
+CONFIG_NSH_IPv6NETMASK_6=0x0000
+CONFIG_NSH_IPv6NETMASK_7=0x0000
+CONFIG_NSH_IPv6NETMASK_8=0x0000
+# CONFIG_NSH_DNS is not set
+CONFIG_NSH_NOMAC=y
+CONFIG_NSH_SWMAC=y
+CONFIG_NSH_MACADDR=0xabcd
+CONFIG_NSH_MAX_ROUNDTRIP=20
+# CONFIG_NSH_LOGIN is not set
+# CONFIG_NSH_CONSOLE_LOGIN is not set
+
+#
+# NxWidgets/NxWM
+#
+
+#
+# Platform-specific Support
+#
+# CONFIG_PLATFORM_CONFIGDATA is not set
+
+#
+# System Libraries and NSH Add-Ons
+#
+# CONFIG_SYSTEM_CLE is not set
+# CONFIG_SYSTEM_CUTERM is not set
+# CONFIG_SYSTEM_FLASH_ERASEALL is not set
+# CONFIG_SYSTEM_FREE is not set
+# CONFIG_SYSTEM_HEX2BIN is not set
+# CONFIG_SYSTEM_HEXED is not set
+CONFIG_SYSTEM_I2CTOOL=y
+CONFIG_I2CTOOL_MINBUS=0
+CONFIG_I2CTOOL_MAXBUS=0
+CONFIG_I2CTOOL_MINADDR=0x03
+CONFIG_I2CTOOL_MAXADDR=0x77
+CONFIG_I2CTOOL_MAXREGADDR=0xff
+CONFIG_I2CTOOL_DEFFREQ=400000
+# CONFIG_SYSTEM_INSTALL is not set
+# CONFIG_SYSTEM_MDIO is not set
+# CONFIG_SYSTEM_NETDB is not set
+# CONFIG_SYSTEM_RAMTEST is not set
+CONFIG_READLINE_HAVE_EXTMATCH=y
+CONFIG_SYSTEM_READLINE=y
+CONFIG_READLINE_ECHO=y
+# CONFIG_READLINE_TABCOMPLETION is not set
+# CONFIG_READLINE_CMD_HISTORY is not set
+# CONFIG_SYSTEM_SUDOKU is not set
+# CONFIG_SYSTEM_SYSTEM is not set
+# CONFIG_SYSTEM_TEE is not set
+# CONFIG_SYSTEM_UBLOXMODEM is not set
+# CONFIG_SYSTEM_VI is not set
+# CONFIG_SYSTEM_ZMODEM is not set
diff --git a/configs/sim/sixlowpan/setenv.sh b/configs/sim/sixlowpan/setenv.sh
new file mode 100644
index 0000000000..65065ccc9b
--- /dev/null
+++ b/configs/sim/sixlowpan/setenv.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+# sim/sixlowpan/setenv.sh
+#
+#   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# 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 NuttX 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 OWNER 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.
+#
+
+if [ "$(basename $0)" = "setenv.sh" ] ; then
+  echo "You must source this script, not run it!" 1>&2
+  exit 1
+fi
+
+if [ -z ${PATH_ORIG} ]; then export PATH_ORIG=${PATH}; fi
+
+#export NUTTX_BIN=
+#export PATH=${NUTTX_BIN}:/sbin:/usr/sbin:${PATH_ORIG}
+
+echo "PATH : ${PATH}"
diff --git a/configs/sim/src/sim_boot.c b/configs/sim/src/sim_boot.c
index 826ca47f90..6e0be20777 100644
--- a/configs/sim/src/sim_boot.c
+++ b/configs/sim/src/sim_boot.c
@@ -42,22 +42,6 @@
 
 #include "sim.h"
 
-/****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
-
-/****************************************************************************
- * Private Types
- ****************************************************************************/
-
-/****************************************************************************
- * Private Data
- ****************************************************************************/
-
-/****************************************************************************
- * Private Functions
- ****************************************************************************/
-
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
diff --git a/configs/sim/src/sim_bringup.c b/configs/sim/src/sim_bringup.c
index 8f0d85c078..8dd0f75bdd 100644
--- a/configs/sim/src/sim_bringup.c
+++ b/configs/sim/src/sim_bringup.c
@@ -47,6 +47,7 @@
 #include <nuttx/board.h>
 #include <nuttx/clock.h>
 #include <nuttx/timers/oneshot.h>
+#include <nuttx/wireless/ieee802154/ieee802154_loopback.h>
 
 #include "up_internal.h"
 #include "sim.h"
@@ -139,5 +140,15 @@ int sim_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_IEEE802154_LOOPBACK
+  /* Initialize and register the IEEE802.15.4 MAC network loop device */
+
+  ret = ieee8021514_loopback();
+  if (ret < 0)
+    {
+      _err("ERROR: ieee8021514_loopback() failed: %d\n", ret);
+    }
+#endif
+
   return OK;
 }
diff --git a/include/nuttx/net/ip.h b/include/nuttx/net/ip.h
index c7b606078b..84df352074 100644
--- a/include/nuttx/net/ip.h
+++ b/include/nuttx/net/ip.h
@@ -547,7 +547,7 @@ bool net_ipv6addr_maskcmp(const net_ipv6addr_t addr1,
 
 #define net_is_addr_loopback(a) \
   ((a)[0] == 0 && (a)[1] == 0 && (a)[2] == 0 && (a)[3] == 0 && \
-   (a)[4] == 0 && (a)[5] == 0 && (a)[6] == 0 && (a)[7] == 0x0001)
+   (a)[4] == 0 && (a)[5] == 0 && (a)[6] == 0 && (a)[7] == HTONS(0x0001))
 
 /****************************************************************************
  * Name: net_is_addr_unspecified
@@ -569,7 +569,7 @@ bool net_ipv6addr_maskcmp(const net_ipv6addr_t addr1,
  *
  ****************************************************************************/
 
-#define net_is_addr_mcast(a) (((a)[0] & 0xff00) == 0xff00)
+#define net_is_addr_mcast(a) (((a)[0] & HTONS(0xff00)) == HTONS(0xff00))
 
 /****************************************************************************
  * Name: net_is_addr_linklocal_allnodes_mcast
@@ -580,8 +580,8 @@ bool net_ipv6addr_maskcmp(const net_ipv6addr_t addr1,
  ****************************************************************************/
 
 #define net_is_addr_linklocal_allnodes_mcast(a) \
-  ((a)[0] == 0xff02 && (a)[1] == 0 && (a)[2] == 0 && (a)[3] == 0 && \
-   (a)[4] == 0      && (a)[5] == 0 && (a)[6] == 0 && (a)[7] == 0x0001)
+  ((a)[0] == HTONS(0xff02) && (a)[1] == 0 && (a)[2] == 0 && (a)[3] == 0 && \
+   (a)[4] == 0 && (a)[5] == 0 && (a)[6] == 0 && (a)[7] == HTONS(0x0001))
 
 /****************************************************************************
  * Name: net_is_addr_linklocal_allrouters_mcast
@@ -592,8 +592,8 @@ bool net_ipv6addr_maskcmp(const net_ipv6addr_t addr1,
  ****************************************************************************/
 
 #define net_is_addr_linklocal_allrouters_mcast(a) \
-  ((a)[0] == 0xff02 && (a)[1] == 0 && (a)[2] == 0 && (a)[3] == 0 && \
-   (a)[4] == 0      && (a)[5] == 0 && (a)[6] == 0 && (a)[7] == 0x0002)
+  ((a)[0] == HTONS(0xff02) && (a)[1] == 0 && (a)[2] == 0 && (a)[3] == 0 && \
+   (a)[4] == 0 && (a)[5] == 0 && (a)[6] == 0 && (a)[7] == HTOS(0x0002))
 
 /****************************************************************************
  * Name: net_is_addr_linklocal
@@ -603,7 +603,7 @@ bool net_ipv6addr_maskcmp(const net_ipv6addr_t addr1,
  *
  ****************************************************************************/
 
-#define net_is_addr_linklocal(a) ((a)[0] == 0xfe80)
+#define net_is_addr_linklocal(a) ((a)[0] == HTONS(0xfe80))
 
 /****************************************************************************
  * Name: net_ipaddr_mask
diff --git a/include/nuttx/wireless/ieee802154/ieee802154_loopback.h b/include/nuttx/wireless/ieee802154/ieee802154_loopback.h
new file mode 100644
index 0000000000..d1952df24f
--- /dev/null
+++ b/include/nuttx/wireless/ieee802154/ieee802154_loopback.h
@@ -0,0 +1,73 @@
+/****************************************************************************
+ * include/nuttx/net/ieee802154.h
+ *
+ *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Includes some definitions that a compatible with the LGPL GNU C Library
+ * header file of the same name.
+ *
+ * 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 NuttX 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 OWNER 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.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_WIRELESS_IEEE802154_IEEE802154_LOOPBACK_H
+#define __INCLUDE_NUTTX_WIRELESS_IEEE802154_IEEE802154_LOOPBACK_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#ifdef CONFIG_IEEE802154_LOOPBACK
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: ieee8021514_loopback
+ *
+ * Description:
+ *   Initialize and register the Ieee802.15.4 MAC loopback network driver.
+ *
+ * Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   OK on success; Negated errno on failure.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int ieee8021514_loopback(void);
+
+#endif /* CONFIG_IEEE802154_LOOPBACK */
+#endif /* __INCLUDE_NUTTX_WIRELESS_IEEE802154_IEEE802154_LOOPBACK_H */
diff --git a/net/devif/devif_poll.c b/net/devif/devif_poll.c
index 4a5d325d43..235c58bcf2 100644
--- a/net/devif/devif_poll.c
+++ b/net/devif/devif_poll.c
@@ -45,6 +45,7 @@
 #include <nuttx/clock.h>
 #include <nuttx/net/netconfig.h>
 #include <nuttx/net/netdev.h>
+#include <nuttx/net/net.h>
 
 #include "devif/devif.h"
 #include "arp/arp.h"
@@ -55,6 +56,21 @@
 #include "icmp/icmp.h"
 #include "icmpv6/icmpv6.h"
 #include "igmp/igmp.h"
+#include "sixlowpan/sixlowpan.h"
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+enum devif_packet_type
+{
+  DEVIF_PKT = 0,
+  DEVIF_ICMP,
+  DEVIF_IGMP,
+  DEVIF_TCP,
+  DEVIF_UDP,
+  DEVIF_ICMP6
+};
 
 /****************************************************************************
  * Public Data
@@ -68,6 +84,78 @@ systime_t g_polltime;
  * Private Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Function: devif_packet_conversion
+ *
+ * Description:
+ *   Generic output conversion hook.  Only needed for IEEE802.15.4 for now
+ *   is a point where support for other conversions may be provided.
+ *
+ *   TCP output comes through three different mechansims.  Either from:
+ *
+ *   1. TCP socket output.  For the case of TCP output to an
+ *      IEEE802.15.4, the TCP output is caught in the socket
+ *      send()/sendto() logic and and redirected to 6loWPAN logic.
+ *   2. TCP output from the TCP state machine.  That will occur
+ *      during TCP packet processing by the TCP state meachine.
+ *   3. TCP output resulting from TX or timer polling
+ *
+ *   Cases 2 is handled here.  Logic here detected if (1) an attempt
+ *   to return with d_len > 0 and (2) that the device is an
+ *   IEEE802.15.4 MAC network driver. Under those conditions, 6loWPAN
+ *   logic will be called to create the IEEE80215.4 frames.
+ *
+ * Assumptions:
+ *   The network is locked.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_NET_6LOWPAN
+static void devif_packet_conversion(FAR struct net_driver_s *dev,
+                                    enum devif_packet_type pkttype)
+{
+#ifdef CONFIG_NET_MULTILINK
+  /* Handle the case where multiple link layer protocols are supported */
+
+  if (dev->d_len > 0 && dev->d_lltype == NET_LL_IEEE802154)
+#else
+  if (dev->d_len > 0)
+#endif
+    {
+      if (pkttype == DEVIF_TCP)
+        {
+          FAR struct ipv6_hdr_s *ipv6 = (FAR struct ipv6_hdr_s *)dev->d_buf;
+
+          /* This packet came from a response to TCP polling and is directed
+           * to an IEEE802.15.4 device using 6loWPAN.  Verify that the outgoing
+           * packet is IPv6 with TCP protocol.
+           */
+
+          if (ipv6->vtc ==  IPv6_VERSION && ipv6->proto == IP_PROTO_TCP)
+            {
+              /* Let 6loWPAN convert IPv6 TCP output into IEEE802.15.4 frames. */
+
+              sixlowpan_tcp_send(dev);
+            }
+          else
+            {
+              nerr("ERROR: IPv6 version or protocol error.  Packet dropped\n");
+              nerr("       IP version: %02x proocol: %u\n",
+                   ipv6->vtc, ipv6->proto);
+            }
+        }
+      else
+        {
+          nerr("ERROR: Non-TCP packet dropped.  Packet type: %u\n", pkttype);
+        }
+
+      dev->d_len = 0;
+    }
+}
+#else
+# define devif_packet_conversion(dev,pkttype)
+#endif /* CONFIG_NET_6LOWPAN */
+
 /****************************************************************************
  * Function: devif_poll_pkt_connections
  *
@@ -95,6 +183,10 @@ static int devif_poll_pkt_connections(FAR struct net_driver_s *dev,
 
       pkt_poll(dev, pkt_conn);
 
+      /* Perform any necessary conversions on outgoing packets */
+
+      devif_packet_conversion(dev, DEVIF_PKT);
+
       /* Call back into the driver */
 
       bstop = callback(dev);
@@ -120,6 +212,10 @@ static inline int devif_poll_icmp(FAR struct net_driver_s *dev,
 
   icmp_poll(dev);
 
+  /* Perform any necessary conversions on outgoing packets */
+
+  devif_packet_conversion(dev, DEVIF_ICMP);
+
   /* Call back into the driver */
 
   return callback(dev);
@@ -142,6 +238,10 @@ static inline int devif_poll_icmpv6(FAR struct net_driver_s *dev,
 
   icmpv6_poll(dev);
 
+  /* Perform any necessary conversions on outgoing packets */
+
+  devif_packet_conversion(dev, DEVIF_ICMP6);
+
   /* Call back into the driver */
 
   return callback(dev);
@@ -168,6 +268,10 @@ static inline int devif_poll_igmp(FAR struct net_driver_s *dev,
 
   igmp_poll(dev);
 
+  /* Perform any necessary conversions on outgoing packets */
+
+  devif_packet_conversion(dev, DEVIF_IGMP);
+
   /* Call back into the driver */
 
   return callback(dev);
@@ -201,6 +305,10 @@ static int devif_poll_udp_connections(FAR struct net_driver_s *dev,
 
       udp_poll(dev, conn);
 
+      /* Perform any necessary conversions on outgoing packets */
+
+      devif_packet_conversion(dev, DEVIF_UDP);
+
       /* Call back into the driver */
 
       bstop = callback(dev);
@@ -237,6 +345,10 @@ static inline int devif_poll_tcp_connections(FAR struct net_driver_s *dev,
 
       tcp_poll(dev, conn);
 
+      /* Perform any necessary conversions on outgoing packets */
+
+      devif_packet_conversion(dev, DEVIF_TCP);
+
       /* Call back into the driver */
 
       bstop = callback(dev);
@@ -277,6 +389,10 @@ static inline int devif_poll_tcp_timer(FAR struct net_driver_s *dev,
 
       tcp_timer(dev, conn, hsec);
 
+      /* Perform any necessary conversions on outgoing packets */
+
+      devif_packet_conversion(dev, DEVIF_TCP);
+
       /* Call back into the driver */
 
       bstop = callback(dev);
diff --git a/net/devif/ipv6_input.c b/net/devif/ipv6_input.c
index d55b0739ad..24be107a47 100644
--- a/net/devif/ipv6_input.c
+++ b/net/devif/ipv6_input.c
@@ -261,24 +261,29 @@ int ipv6_input(FAR struct net_driver_s *dev)
         tcp_ipv6_input(dev);
 
 #ifdef CONFIG_NET_6LOWPAN
-        /* TCP output comes through two different mechansims.  Either from:
+        /* TCP output comes through three different mechansims.  Either from:
          *
          *   1. TCP socket output.  For the case of TCP output to an
          *      IEEE802.15.4, the TCP output is caught in the socket
          *      send()/sendto() logic and and redirected to 6loWPAN logic.
-         *   2. TCP output from the TCP state machine.  That will pass
-         *      here and can be detected if d_len > 0.  It will be redirected
-         *      to 6loWPAN logic here.
+         *   2. TCP output from the TCP state machine.  That will occur
+         *      during TCP packet processing by the TCP state meachine.
+         *   3. TCP output resulting from TX or timer polling
+         *
+         * Cases 2 is handled here.  Logic here detected if (1) an attempt
+         * to return with d_len > 0 and (2) that the device is an
+         * IEEE802.15.4 MAC network driver. Under those conditions, 6loWPAN
+         * logic will be called to create the IEEE80215.4 frames.
          */
 
 #ifdef CONFIG_NET_MULTILINK
-       /* Handle the case where multiple link layer protocols are supported */
+        /* Handle the case where multiple link layer protocols are supported */
 
-       if (dev->d_len > 0 && dev->d_lltype == CONFIG_NET_6LOWPAN)
+        if (dev->d_len > 0 && dev->d_lltype == CONFIG_NET_6LOWPAN)
 #else
-       if (dev->d_len > 0)
+        if (dev->d_len > 0)
 #endif
-         {
+          {
             /* Let 6loWPAN handle the TCP output */
 
             sixlowpan_tcp_send(dev);
@@ -286,7 +291,7 @@ int ipv6_input(FAR struct net_driver_s *dev)
             /* Drop the packet in the d_buf */
 
             goto drop;
-         }
+          }
 #endif /* CONFIG_NET_6LOWPAN */
         break;
 #endif /* NET_TCP_HAVE_STACK */
diff --git a/net/procfs/netdev_statistics.c b/net/procfs/netdev_statistics.c
index 80154c91fa..d7673507b7 100644
--- a/net/procfs/netdev_statistics.c
+++ b/net/procfs/netdev_statistics.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * net/procfs/netdev_statistics.c
  *
- *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +47,7 @@
 #include <netinet/ether.h>
 
 #include <nuttx/net/netdev.h>
+#include <nuttx/net/sixlowpan.h>
 
 #include "netdev/netdev.h"
 #include "utils/utils.h"
@@ -106,6 +107,9 @@ static const linegen_t g_linegen[] =
 static int netprocfs_linklayer(FAR struct netprocfs_file_s *netfile)
 {
   FAR struct net_driver_s *dev;
+#ifdef CONFIG_NET_6LOWPAN
+  FAR struct ieee802154_driver_s *ieee;
+#endif
   FAR const char *status;
   int len = 0;
 
@@ -142,6 +146,30 @@ static int netprocfs_linklayer(FAR struct netprocfs_file_s *netfile)
         break;
 #endif
 
+#ifdef CONFIG_NET_6LOWPAN
+      case NET_LL_IEEE802154:
+        {
+          ieee = (FAR struct ieee802154_driver_s *)dev;
+
+#if CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 2
+          len += snprintf(&netfile->line[len], NET_LINELEN - len,
+                          "%s\tLink encap:6loWPAN HWaddr %02x:%02x",
+                          dev->d_ifname,
+                          ieee->i_nodeaddr.u8[0], ieee->i_nodeaddr.u8[1]);
+#else /* CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 8 */
+          len += snprintf(&netfile->line[len], NET_LINELEN - len,
+                          "%s\tLink encap:6loWPAN HWaddr "
+                          "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
+                          dev->d_ifname,
+                          ieee->i_nodeaddr.u8[0], ieee->i_nodeaddr.u8[1],
+                          ieee->i_nodeaddr.u8[2], ieee->i_nodeaddr.u8[3],
+                          ieee->i_nodeaddr.u8[4], ieee->i_nodeaddr.u8[5],
+                          ieee->i_nodeaddr.u8[6], ieee->i_nodeaddr.u8[7]);
+#endif
+        }
+        break;
+#endif
+
 #ifdef CONFIG_NET_LOOPBACK
       case NET_LL_LOOPBACK:
         len += snprintf(&netfile->line[len], NET_LINELEN - len,
@@ -184,6 +212,26 @@ static int netprocfs_linklayer(FAR struct netprocfs_file_s *netfile)
                   "%s\tLink encap:Ethernet HWaddr %s at %s\n",
                   dev->d_ifname, ether_ntoa(&dev->d_mac), status);
 
+#elif defined(CONFIG_NET_6LOWPAN)
+  ieee = (FAR struct ieee802154_driver_s *)dev;
+
+#if CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 2
+  len += snprintf(&netfile->line[len], NET_LINELEN - len,
+                  "%s\tLink encap:6loWPAN HWaddr %02x:%02x at %s",
+                  dev->d_ifname,
+                  ieee->i_nodeaddr.u8[0], ieee->i_nodeaddr.u8[1],
+                  status);
+#else /* CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 8 */
+  len += snprintf(&netfile->line[len], NET_LINELEN - len,
+                  "%s\tLink encap:6loWPAN HWaddr "
+                  "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x at %s",
+                  dev->d_ifname,
+                  ieee->i_nodeaddr.u8[0], ieee->i_nodeaddr.u8[1],
+                  ieee->i_nodeaddr.u8[2], ieee->i_nodeaddr.u8[3],
+                  ieee->i_nodeaddr.u8[4], ieee->i_nodeaddr.u8[5],
+                  ieee->i_nodeaddr.u8[6], ieee->i_nodeaddr.u8[7],
+                  status);
+#endif
 #elif defined(CONFIG_NET_LOOPBACK)
   len += snprintf(&netfile->line[len], NET_LINELEN - len,
                   "%s\tLink encap:Local Loopback at %s\n",
diff --git a/net/sixlowpan/sixlowpan.h b/net/sixlowpan/sixlowpan.h
index c9f54154b5..05ce9496c9 100644
--- a/net/sixlowpan/sixlowpan.h
+++ b/net/sixlowpan/sixlowpan.h
@@ -110,15 +110,20 @@ ssize_t psock_6lowpan_tcp_send(FAR struct socket *psock, FAR const void *buf,
  * Function: sixlowpan_tcp_send
  *
  * Description:
- *   TCP output comes through two different mechansims.  Either from:
+ *   TCP output comes through three different mechansims.  Either from:
  *
  *   1. TCP socket output.  For the case of TCP output to an
  *      IEEE802.15.4, the TCP output is caught in the socket
  *      send()/sendto() logic and and redirected to psock_6lowpan_tcp_send().
  *   2. TCP output from the TCP state machine.  That will occur
- *      during TCP packet processing by the TCP state meachine.  It
- *      is detected there when ipv6_tcp_input() returns with d_len > 0. This
- *      will be redirected here.
+ *      during TCP packet processing by the TCP state meachine.
+ *   3. TCP output resulting from TX or timer polling
+ *
+ *   Cases 2 and 3 will be handled here.  Logic in ipv6_tcp_input(),
+ *   devif_poll(), and devif_timer() detect if (1) an attempt to return with
+ *   d_len > 0 and (2) that the device is an IEEE802.15.4 MAC network
+ *   driver. Under those conditions, this function will be called to create
+ *   the IEEE80215.4 frames.
  *
  * Parameters:
  *   dev - An instance of nework device state structure
diff --git a/net/sixlowpan/sixlowpan_hc06.c b/net/sixlowpan/sixlowpan_hc06.c
index 270c6f6885..5caee4b838 100644
--- a/net/sixlowpan/sixlowpan_hc06.c
+++ b/net/sixlowpan/sixlowpan_hc06.c
@@ -455,7 +455,8 @@ void sixlowpan_compresshdr_hc06(FAR struct ieee802154_driver_s *ieee,
   uint8_t iphc1;
   uint8_t tmp;
 
-  ninfodumpbuffer("IPv6 before compression", ipv6, sizeof(ipv6_hdr_s));
+  ninfodumpbuffer("IPv6 before compression", (FAR const uint8_t *)ipv6,
+                  sizeof(struct ipv6_hdr_s));
 
   g_hc06ptr = g_rimeptr + 2;
 
diff --git a/net/sixlowpan/sixlowpan_input.c b/net/sixlowpan/sixlowpan_input.c
index b89af933d8..5ee8b49017 100644
--- a/net/sixlowpan/sixlowpan_input.c
+++ b/net/sixlowpan/sixlowpan_input.c
@@ -470,7 +470,8 @@ copypayload:
     }
 #endif /* CONFIG_NET_6LOWPAN_FRAG */
 
-  ninfodumpbuffer("IPv6 header", IPv6BUF(ieee->i_dev), IPv6_HDRLEN)
+  ninfodumpbuffer("IPv6 header", (FAR const uint8_t *)IPv6BUF(&ieee->i_dev),
+                  IPv6_HDRLEN);
   return OK;
 }
 
diff --git a/net/sixlowpan/sixlowpan_internal.h b/net/sixlowpan/sixlowpan_internal.h
index c6a83480d9..4e8fc75d77 100644
--- a/net/sixlowpan/sixlowpan_internal.h
+++ b/net/sixlowpan/sixlowpan_internal.h
@@ -243,7 +243,8 @@
  */
 
 #define SIXLOWPAN_IS_IID_16BIT_COMPRESSABLE(a) \
-  ((((a)[4]) == 0x0000) && (((a)[5]) == 0x00ff) && (((a)[6]) == 0xfe00))
+  ((((a)[4]) == 0x0000) && (((a)[5]) == HTONS(0x00ff)) && \
+   (((a)[6]) == 0xfe00))
 
 /* Check whether the 9-bit group-id of the compressed multicast address is
  * known. It is true if the 9-bit group is the all nodes or all routers
@@ -265,27 +266,27 @@
 #define SIXLOWPAN_IS_MCASTADDR_COMPRESSABLE(a) \
   ((a)[1] == 0 && (a)[2] == 0 && (a)[3] == 0 && \
    (a)[4] == 0 && (a)[5] == 0 && (a)[6] == 0 && \
-   ((a)[7] == 0x0001 || (a)[7] == 0x0002))
+   ((a)[7] == HTONS(0x0001) || (a)[7] == HTONS(0x0002)))
 
 /* FFXX:0000:0000:0000:0000:00XX:XXXX:XXXX */
 
 #define SIXLOWPAN_IS_MCASTADDR_COMPRESSABLE48(a) \
   ((a)[1] == 0 && (a)[2] == 0 && (a)[3] == 0 && \
-   (a)[4] == 0 && (((a)[5] & 0xff00) == 0))
+   (a)[4] == 0 && (((a)[5] & HTONS(0xff00)) == 0))
 
 /* FFXX:0000:0000:0000:0000:0000:00XX:XXXX */
 
 #define SIXLOWPAN_IS_MCASTADDR_COMPRESSABLE32(a) \
   ((a)[1] == 0 && (a)[2] == 0 && (a)[3] == 0 && \
-   (a)[4] == 0 && (a)[5] == 0 && ((a)[6] & 0xff00) == 0)
+   (a)[4] == 0 && (a)[5] == 0 && ((a)[6] & HTONS(0xff00)) == 0)
 
 /* FF02:0000:0000:0000:0000:0000:0000:00XX */
 
 #define SIXLOWPAN_IS_MCASTADDR_COMPRESSABLE8(a) \
-  ((((a)[0] & 0x00ff) == 0x0002) && \
+  ((((a)[0] & HTONS(0x00ff)) == HTONS(0x0002)) && \
    (a)[1] == 0 && (a)[2] == 0 && (a)[3] == 0 && \
    (a)[4] == 0 && (a)[5] == 0 && (a)[6] == 0 && \
-   (((a)[7] & 0xff00) == 0x0000))
+   (((a)[7] & HTONS(0xff00)) == 0x0000))
 
 /* General helper macros ****************************************************/
 
diff --git a/net/sixlowpan/sixlowpan_tcpsend.c b/net/sixlowpan/sixlowpan_tcpsend.c
index 2b0ce15cb3..7beceee5c5 100644
--- a/net/sixlowpan/sixlowpan_tcpsend.c
+++ b/net/sixlowpan/sixlowpan_tcpsend.c
@@ -155,6 +155,8 @@ ssize_t psock_6lowpan_tcp_send(FAR struct socket *psock, FAR const void *buf,
   uint16_t iplen;
   int ret;
 
+  ninfo("buflen %lu\n", (unsigned long)buflen);
+
   DEBUGASSERT(psock != NULL && psock->s_crefs > 0);
   DEBUGASSERT(psock->s_type == SOCK_STREAM);
 
@@ -249,7 +251,8 @@ ssize_t psock_6lowpan_tcp_send(FAR struct socket *psock, FAR const void *buf,
   net_ipv6addr_hdrcopy(ipv6tcp.ipv6.srcipaddr,  conn->u.ipv6.laddr);
   net_ipv6addr_hdrcopy(ipv6tcp.ipv6.destipaddr, conn->u.ipv6.raddr);
 
-  ninfo("IPv6 length: %d\n", ((int)ipv6->len[0] << 8) + ipv6->len[1]);
+  ninfo("IPv6 length: %d\n",
+        ((int)ipv6tcp.ipv6.len[0] << 8) + ipv6tcp.ipv6.len[1]);
 
 #ifdef CONFIG_NET_STATISTICS
   g_netstats.ipv6.sent++;
@@ -289,7 +292,7 @@ ssize_t psock_6lowpan_tcp_send(FAR struct socket *psock, FAR const void *buf,
   ipv6tcp.tcp.tcpchksum   = 0;
   ipv6tcp.tcp.tcpchksum   = ~sixlowpan_tcp_chksum(&ipv6tcp, buf, buflen);
 
-  ninfo("Outgoing TCP packet length: %d bytes\n", iplen + IOPv6_HDRLEN);
+  ninfo("Outgoing TCP packet length: %d bytes\n", iplen + IPv6_HDRLEN);
 
 #ifdef CONFIG_NET_STATISTICS
   g_netstats.tcp.sent++;
@@ -332,15 +335,20 @@ ssize_t psock_6lowpan_tcp_send(FAR struct socket *psock, FAR const void *buf,
  * Function: sixlowpan_tcp_send
  *
  * Description:
- *   TCP output comes through two different mechansims.  Either from:
+ *   TCP output comes through three different mechansims.  Either from:
  *
  *   1. TCP socket output.  For the case of TCP output to an
  *      IEEE802.15.4, the TCP output is caught in the socket
  *      send()/sendto() logic and and redirected to psock_6lowpan_tcp_send().
  *   2. TCP output from the TCP state machine.  That will occur
- *      during TCP packet processing by the TCP state meachine.  It
- *      is detected there when ipv6_tcp_input() returns with d_len > 0. This
- *      will be redirected here.
+ *      during TCP packet processing by the TCP state meachine.
+ *   3. TCP output resulting from TX or timer polling
+ *
+ *   Cases 2 and 3 will be handled here.  Logic in ipv6_tcp_input(),
+ *   devif_poll(), and devif_timer() detect if (1) an attempt to return with
+ *   d_len > 0 and (2) that the device is an IEEE802.15.4 MAC network
+ *   driver. Under those conditions, this function will be called to create
+ *   the IEEE80215.4 frames.
  *
  * Parameters:
  *   dev - An instance of nework device state structure
@@ -359,6 +367,8 @@ void sixlowpan_tcp_send(FAR struct net_driver_s *dev)
 
   /* Double check */
 
+  ninfo("d_len %u\n", dev->d_len);
+
   if (dev != NULL && dev->d_len > 0)
     {
       FAR struct ipv6_hdr_s *ipv6hdr;
@@ -383,10 +393,10 @@ void sixlowpan_tcp_send(FAR struct net_driver_s *dev)
           size_t hdrlen;
 
           hdrlen = IPv6_HDRLEN + TCP_HDRLEN;
-          if (hdrlen < dev->d_len)
+          if (hdrlen > dev->d_len)
             {
               nwarn("WARNING: Packet to small:  Have %u need >%u\n",
-                  dev->d_len, hdrlen);
+                    dev->d_len, hdrlen);
             }
           else
             {
diff --git a/net/sixlowpan/sixlowpan_udpsend.c b/net/sixlowpan/sixlowpan_udpsend.c
index 61fbe3b237..53c7ead6ce 100644
--- a/net/sixlowpan/sixlowpan_udpsend.c
+++ b/net/sixlowpan/sixlowpan_udpsend.c
@@ -263,7 +263,8 @@ ssize_t psock_6lowpan_udp_sendto(FAR struct socket *psock,
   net_ipv6addr_hdrcopy(ipv6udp.ipv6.srcipaddr,  to6->sin6_addr.in6_u.u6_addr16);
   net_ipv6addr_hdrcopy(ipv6udp.ipv6.destipaddr, conn->u.ipv6.raddr);
 
-  ninfo("IPv6 length: %d\n", ((int)ipv6->len[0] << 8) + ipv6->len[1]);
+  ninfo("IPv6 length: %d\n",
+        ((int)ipv6udp.ipv6.len[0] << 8) + ipv6udp.ipv6.len[1]);
 
 #ifdef CONFIG_NET_STATISTICS
   g_netstats.ipv6.sent++;
diff --git a/net/sixlowpan/sixlowpan_utils.c b/net/sixlowpan/sixlowpan_utils.c
index fae33fe207..7dd4e9e35c 100644
--- a/net/sixlowpan/sixlowpan_utils.c
+++ b/net/sixlowpan/sixlowpan_utils.c
@@ -116,7 +116,7 @@ void sixlowpan_ipfromrime(FAR const struct rimeaddr_s *rime,
                           net_ipv6addr_t ipaddr)
 {
   memset(ipaddr, 0, sizeof(net_ipv6addr_t));
-  ipaddr[0] = 0xfe80;
+  ipaddr[0] = HTONS(0xfe80);
 
   /* We consider only links with IEEE EUI-64 identifier or IEEE 48-bit MAC
    * addresses.  NOTE: that CONFIG_NET_6LOWPAN_RIMEADDR_SIZE may be 2 or
@@ -128,7 +128,7 @@ void sixlowpan_ipfromrime(FAR const struct rimeaddr_s *rime,
    */
 
   memcpy(&ipaddr[4], rime, CONFIG_NET_6LOWPAN_RIMEADDR_SIZE);
-  ipaddr[4] ^= 0x0200;
+  ipaddr[4] ^= HTONS(0x0200);
 }
 
 /****************************************************************************
@@ -174,10 +174,10 @@ bool sixlowpan_ismacbased(const net_ipv6addr_t ipaddr,
   FAR const uint8_t *rimeptr = rime->u8;
 
 #if CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 2
-  return ((ipaddr[4] == (GETINT16(rimeptr, 0) ^ 0x0200)) &&
+  return ((ipaddr[4] == htons((GETINT16(rimeptr, 0) ^ 0x0200))) &&
            ipaddr[5] == 0 && ipaddr[6] == 0 && ipaddr[7] == 0);
 #else /* CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 8 */
-  return ((ipaddr[4] == (GETINT16(rimeptr, 0) ^ 0x0200)) &&
+  return ((ipaddr[4] == htons((GETINT16(rimeptr, 0) ^ 0x0200))) &&
            ipaddr[5] == GETINT16(rimeptr, 2) &&
            ipaddr[6] == GETINT16(rimeptr, 4) &&
            ipaddr[7] == GETINT16(rimeptr, 6));
diff --git a/net/tcp/tcp_finddev.c b/net/tcp/tcp_finddev.c
index ef6ae8f0d2..e3cf0b3288 100644
--- a/net/tcp/tcp_finddev.c
+++ b/net/tcp/tcp_finddev.c
@@ -250,7 +250,6 @@ int tcp_local_ipv6_device(FAR struct tcp_conn_s *conn)
 #else
   return tcp_find_ipv6_device(conn, NULL);
 #endif
-
 }
 #endif /* CONFIG_NET_IPv6 */
 
diff --git a/wireless/ieee802154/Kconfig b/wireless/ieee802154/Kconfig
index 7cc144f54a..90d20d07d6 100644
--- a/wireless/ieee802154/Kconfig
+++ b/wireless/ieee802154/Kconfig
@@ -45,29 +45,6 @@ config IEEE802154_LOOPBACK
 	---help---
 		Add support for the IEEE802154 6loWPAN Loopback test device.
 
-if IEEE802154_LOOPBACK
-
-choice
-	prompt "Work queue"
-	default IEEE802154_LOOPBACK_LPWORK if SCHED_LPWORK
-	default IEEE802154_LOOPBACK_HPWORK if !SCHED_LPWORK && SCHED_HPWORK
-	depends on SCHED_WORKQUEUE
-	---help---
-		Work queue support is required to use the loopback driver.  If the
-		low priority work queue is available, then it should be used by the
-		loopback driver.
-
-config IEEE802154_LOOPBACK_HPWORK
-	bool "High priority"
-	depends on SCHED_HPWORK
-
-config IEEE802154_LOOPBACK_LPWORK
-	bool "Low priority"
-	depends on SCHED_LPWORK
-
-endchoice # Work queue
-endif # IEEE802154_LOOPBACK
-
 config IEEE802154_LOOPBACK
 	bool "IEEE802154 6loWPAN Loopback"
 	default n
@@ -99,4 +76,4 @@ config IEEE802154_LOOPBACK_LPWORK
 endchoice # Work queue
 endif # IEEE802154_LOOPBACK
 
-endif # IEEE802154
+endif # WIRELESS_IEEE802154
diff --git a/wireless/ieee802154/mac802154_loopback.c b/wireless/ieee802154/mac802154_loopback.c
index 5bbd6f5beb..1f8dc4e8c3 100644
--- a/wireless/ieee802154/mac802154_loopback.c
+++ b/wireless/ieee802154/mac802154_loopback.c
@@ -53,11 +53,8 @@
 #include <nuttx/wqueue.h>
 #include <nuttx/net/net.h>
 #include <nuttx/net/ip.h>
-#include <nuttx/net/loopback.h>
-
-#ifndef CONFIG_NET_LOOPBACK
-#  include <nuttx/net/sixlowpan.h>
-#endif
+#include <nuttx/net/sixlowpan.h>
+#include <nuttx/wireless/ieee802154/ieee802154_loopback.h>
 
 #ifdef CONFIG_IEEE802154_LOOPBACK
 
@@ -110,14 +107,6 @@ struct lo_driver_s
 static struct lo_driver_s g_loopback;
 static uint8_t g_iobuffer[CONFIG_NET_6LOWPAN_MTU + CONFIG_NET_GUARDSIZE];
 
-#ifndef CONFIG_NET_LOOPBACK
-static const net_ipv6addr_t g_lo_ipv6addr   =
-{
-  HTONS(0), HTONS(0), HTONS(0), HTONS(0),
-  HTONS(0), HTONS(0), HTONS(0), HTONS(1)
-};
-#endif
-
 /****************************************************************************
  * Private Function Prototypes
  ****************************************************************************/
@@ -173,6 +162,22 @@ static int lo_txpoll(FAR struct net_driver_s *dev)
   FAR struct iob_s *iob;
   int ret;
 
+  if (dev->d_len > 0 || priv->lo_ieee.i_framelist != NULL)
+    {
+      ninfo("d_len: %u i_framelist: %p\n",
+            dev->d_len, priv->lo_ieee.i_framelist);
+
+      /* The only two valid settings are:
+       *
+       * 1. Nothing to send:
+       *    dev->d_len == 0 && priv->lo_ieee.i_framelist == NULL
+       * 2. Outgoing packet has been converted to IEEE802.15.4 frames:
+       *    dev->d_len == 0 && priv->lo_ieee.i_framelist != NULL
+       */
+
+      DEBUGASSERT(dev->d_len == 0 && priv->lo_ieee.i_framelist != NULL);
+    }
+
   /* Remove the queued IOBs from driver structure */
 
   head = priv->lo_ieee.i_framelist;
@@ -309,6 +314,11 @@ static void lo_poll_expiry(int argc, wdparm_t arg, ...)
 {
   FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)arg;
 
+  if (!work_available(&priv->lo_work))
+    {
+      nwarn("WARNING: lo_work NOT available\n");
+    }
+
   /* Schedule to perform the interrupt processing on the worker thread. */
 
   work_queue(LPBKWORK, &priv->lo_work, lo_poll_work, priv, 0);
@@ -335,14 +345,22 @@ static int lo_ifup(FAR struct net_driver_s *dev)
 {
   FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private;
 
-#if CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 2
-  ninfo("Bringing up: Rime %02x:%02x PANID=%04x\n",
-        dev->d_ipv6addr[0], dev->d_ipv6addr[1], priv->lo_ieee.i_panid);
-#elif CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 8
-  ninfo("Bringing up: Rime %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x PANID=%04x\n",
+  ninfo("Bringing up: IPv6 %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
         dev->d_ipv6addr[0], dev->d_ipv6addr[1], dev->d_ipv6addr[2],
         dev->d_ipv6addr[3], dev->d_ipv6addr[4], dev->d_ipv6addr[5],
-        dev->d_ipv6addr[6], dev->d_ipv6addr[7], priv->lo_ieee.i_panid);
+        dev->d_ipv6addr[6], dev->d_ipv6addr[7]);
+
+#if CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 2
+  ninfo("             Node: %02x:%02x PANID=%04x\n",
+         priv->lo_ieee.i_nodeaddr.u8[0], priv->lo_ieee.i_nodeaddr.u8[1],
+         priv->lo_ieee.i_panid);
+#else /* CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 8 */
+  ninfo("             Node: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x PANID=%04x\n",
+         priv->lo_ieee.i_nodeaddr.u8[0], priv->lo_ieee.i_nodeaddr.u8[1],
+         priv->lo_ieee.i_nodeaddr.u8[2], priv->lo_ieee.i_nodeaddr.u8[3],
+         priv->lo_ieee.i_nodeaddr.u8[4], priv->lo_ieee.i_nodeaddr.u8[5],
+         priv->lo_ieee.i_nodeaddr.u8[6], priv->lo_ieee.i_nodeaddr.u8[7],
+         priv->lo_ieee.i_panid);
 #endif
 
   /* Set and activate a timer process */
@@ -374,6 +392,8 @@ static int lo_ifdown(FAR struct net_driver_s *dev)
 {
   FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private;
 
+  ninfo("IP up: %u\n", priv->lo_bifup);
+
   /* Cancel the TX poll timer and TX timeout timers */
 
   wd_cancel(priv->lo_polldog);
@@ -405,6 +425,8 @@ static void lo_txavail_work(FAR void *arg)
 {
   FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)arg;
 
+  ninfo("IP up: %u\n", priv->lo_bifup);
+
   /* Ignore the notification if the interface is not yet up */
 
   net_lock();
@@ -446,6 +468,8 @@ static int lo_txavail(FAR struct net_driver_s *dev)
 {
   FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private;
 
+  ninfo("Available: %u\n", work_available(&priv->lo_work));
+
   /* Is our single work structure available?  It may not be if there are
    * pending interrupt actions and we will have to ignore the Tx
    * availability action.
@@ -482,6 +506,14 @@ static int lo_txavail(FAR struct net_driver_s *dev)
 #if defined(CONFIG_NET_IGMP) || defined(CONFIG_NET_ICMPv6)
 static int lo_addmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac)
 {
+#if CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 2
+  ninfo("MAC: %02x:%02x\n",
+         mac[0], mac[1]);
+#else /* CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 8 */
+  ninfo("MAC: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
+         mac[0], mac[1], mac[2], mac[3], mac[4], mac[5], mac[6], mac[7]);
+#endif
+
   /* There is no multicast support in the loopback driver */
 
   return OK;
@@ -509,6 +541,14 @@ static int lo_addmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac)
 #ifdef CONFIG_NET_IGMP
 static int lo_rmmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac)
 {
+#if CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 2
+  ninfo("MAC: %02x:%02x\n",
+         mac[0], mac[1]);
+#else /* CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 8 */
+  ninfo("MAC: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
+         mac[0], mac[1], mac[2], mac[3], mac[4], mac[5], mac[6], mac[7]);
+#endif
+
   /* There is no multicast support in the loopback driver */
 
   return OK;
@@ -520,14 +560,13 @@ static int lo_rmmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac)
  ****************************************************************************/
 
 /****************************************************************************
- * Function: localhost_initialize
+ * Function: ieee8021514_loopback
  *
  * Description:
- *   Initialize the Ethernet controller and driver
+ *   Initialize and register the Ieee802.15.4 MAC loopback network driver.
  *
  * Parameters:
- *   intf - In the case where there are multiple EMACs, this value
- *          identifies which EMAC is to be initialized.
+ *   None
  *
  * Returned Value:
  *   OK on success; Negated errno on failure.
@@ -536,11 +575,13 @@ static int lo_rmmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac)
  *
  ****************************************************************************/
 
-int localhost_initialize(void)
+int ieee8021514_loopback(void)
 {
   FAR struct lo_driver_s  *priv;
   FAR struct net_driver_s *dev;
 
+  ninfo("Initializing\n");
+
   /* Get the interface structure associated with this interface number. */
 
   priv = &g_loopback;
@@ -570,12 +611,6 @@ int localhost_initialize(void)
 
   (void)netdev_register(&priv->lo_ieee.i_dev, NET_LL_IEEE802154);
 
-  /* Set the local loopback IP address */
-
-  net_ipv6addr_copy(dev->d_ipv6addr, g_lo_ipv6addr);
-  net_ipv6addr_copy(dev->d_ipv6draddr, g_lo_ipv6addr);
-  net_ipv6addr_copy(dev->d_ipv6netmask, g_ipv6_alloneaddr);
-
   /* Put the network in the UP state */
 
   dev->d_flags = IFF_UP;