diff --git a/configs/mikroe-stm32f4/nxlines/defconfig b/configs/mikroe-stm32f4/nxlines/defconfig
index 16460c044e..0787a86fb7 100644
--- a/configs/mikroe-stm32f4/nxlines/defconfig
+++ b/configs/mikroe-stm32f4/nxlines/defconfig
@@ -34,6 +34,7 @@ CONFIG_LCD=y
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
 CONFIG_MM_REGIONS=2
+CONFIG_MQ_MAXMSGSIZE=64
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
 CONFIG_NSH_ARCHINIT=y
@@ -42,6 +43,8 @@ CONFIG_NSH_FILEIOSIZE=512
 CONFIG_NSH_LIBRARY=y
 CONFIG_NSH_LINELEN=64
 CONFIG_NSH_READLINE=y
+CONFIG_NX_BLOCKING=y
+CONFIG_NX_MULTIUSER=y
 CONFIG_NX=y
 CONFIG_NXFONT_SERIF22X28B=y
 CONFIG_NXTK_BORDERCOLOR1=0x8410
diff --git a/configs/nucleo-f303re/nxlines/defconfig b/configs/nucleo-f303re/nxlines/defconfig
index 0e7151ab16..2148384e7c 100644
--- a/configs/nucleo-f303re/nxlines/defconfig
+++ b/configs/nucleo-f303re/nxlines/defconfig
@@ -12,18 +12,19 @@ CONFIG_ARCH="arm"
 CONFIG_BOARD_LOOPSPERMSEC=6522
 CONFIG_CAN=y
 CONFIG_DISABLE_POLL=y
-CONFIG_EXAMPLES_NXLINES_EXTERNINIT=y
 CONFIG_EXAMPLES_NXLINES=y
 CONFIG_IDLETHREAD_STACKSIZE=2048
 CONFIG_INTELHEX_BINARY=y
 CONFIG_LCD_SSD1351=y
 CONFIG_LCD=y
-CONFIG_LIB_BOARDCTL=y
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
 CONFIG_MM_REGIONS=2
+CONFIG_MQ_MAXMSGSIZE=64
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
+CONFIG_NX_BLOCKING=y
+CONFIG_NX_MULTIUSER=y
 CONFIG_NX=y
 CONFIG_NXFONT_MONO5X8=y
 CONFIG_PREALLOC_MQ_MSGS=4
diff --git a/configs/open1788/nxlines/defconfig b/configs/open1788/nxlines/defconfig
index 7adff75ce6..aa0f37367c 100644
--- a/configs/open1788/nxlines/defconfig
+++ b/configs/open1788/nxlines/defconfig
@@ -29,8 +29,11 @@ CONFIG_MAX_WDOGPARMS=2
 CONFIG_MM_REGIONS=2
 CONFIG_MMCSD_SDIO=y
 CONFIG_MMCSD=y
+CONFIG_MQ_MAXMSGSIZE=64
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
+CONFIG_NX_BLOCKING=y
+CONFIG_NX_MULTIUSER=y
 CONFIG_NX=y
 CONFIG_NXFONT_SANS23X27=y
 CONFIG_NXFONT_SANS28X37B=y
diff --git a/configs/samv71-xult/mxtxplnd/defconfig b/configs/samv71-xult/mxtxplnd/defconfig
index 4e511e762c..f539f422fd 100644
--- a/configs/samv71-xult/mxtxplnd/defconfig
+++ b/configs/samv71-xult/mxtxplnd/defconfig
@@ -44,6 +44,7 @@ CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
 CONFIG_MMCSD_MULTIBLOCK_DISABLE=y
 CONFIG_MMCSD_SDIO=y
+CONFIG_MQ_MAXMSGSIZE=64
 CONFIG_MTD_AT24XX=y
 CONFIG_MTD_AT25=y
 CONFIG_MTD_CONFIG=y
@@ -55,6 +56,8 @@ CONFIG_NSH_BUILTIN_APPS=y
 CONFIG_NSH_FILEIOSIZE=512
 CONFIG_NSH_LINELEN=64
 CONFIG_NSH_READLINE=y
+CONFIG_NX_BLOCKING=y
+CONFIG_NX_MULTIUSER=y
 CONFIG_NX=y
 CONFIG_NXFONT_SANS23X27=y
 CONFIG_PREALLOC_MQ_MSGS=4
diff --git a/configs/sim/nxlines/defconfig b/configs/sim/nxlines/defconfig
index d439f90122..67a0e13898 100644
--- a/configs/sim/nxlines/defconfig
+++ b/configs/sim/nxlines/defconfig
@@ -25,14 +25,16 @@ CONFIG_HAVE_CXX=y
 CONFIG_HOST_WINDOWS=y
 CONFIG_IDLETHREAD_STACKSIZE=8192
 CONFIG_MAX_TASKS=16
-CONFIG_MQ_MAXMSGSIZE=48
+CONFIG_MQ_MAXMSGSIZE=64
 CONFIG_NSH_ARCHINIT=y
 CONFIG_NSH_FATDEVNO=2
 CONFIG_NSH_LIBRARY=y
 CONFIG_NSH_READLINE=y
 CONFIG_NSH_ROMFSDEVNO=1
 CONFIG_NSH_ROMFSETC=y
+CONFIG_NX_BLOCKING=y
 CONFIG_NX_KBD=y
+CONFIG_NX_MULTIUSER=y
 CONFIG_NX_XYINPUT_MOUSE=y
 CONFIG_NX=y
 CONFIG_NXFONT_SANS23X27=y
@@ -40,6 +42,7 @@ CONFIG_NXFONT_SANS28X37B=y
 CONFIG_NXTK_BORDERCOLOR1=0x005a96bd
 CONFIG_NXTK_BORDERCOLOR2=0x00233a49
 CONFIG_NXTK_BORDERCOLOR3=0x00f8f8f8
+CONFIG_PREALLOC_MQ_MSGS=4
 CONFIG_PTHREAD_STACK_DEFAULT=8192
 CONFIG_SCHED_ONEXIT=y
 CONFIG_SCHED_WAITPID=y
diff --git a/configs/stm32f4discovery/nxlines/defconfig b/configs/stm32f4discovery/nxlines/defconfig
index 601e8f901c..cd7d9c8b60 100644
--- a/configs/stm32f4discovery/nxlines/defconfig
+++ b/configs/stm32f4discovery/nxlines/defconfig
@@ -32,13 +32,16 @@ CONFIG_LCD=y
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
 CONFIG_MM_REGIONS=2
+CONFIG_MQ_MAXMSGSIZE=64
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
 CONFIG_NSH_FILEIOSIZE=512
 CONFIG_NSH_LIBRARY=y
 CONFIG_NSH_LINELEN=64
 CONFIG_NSH_READLINE=y
+CONFIG_NX_BLOCKING=y
 CONFIG_NX_KBD=y
+CONFIG_NX_MULTIUSER=y
 CONFIG_NX_XYINPUT_MOUSE=y
 CONFIG_NX=y
 CONFIG_NXFONT_SANS22X29B=y
diff --git a/configs/zp214xpa/nxlines/defconfig b/configs/zp214xpa/nxlines/defconfig
index 0d038f49f5..4b6f28e26c 100644
--- a/configs/zp214xpa/nxlines/defconfig
+++ b/configs/zp214xpa/nxlines/defconfig
@@ -14,7 +14,6 @@ CONFIG_DISABLE_POLL=y
 CONFIG_EXAMPLES_NXLINES_BORDERCOLOR=0x01
 CONFIG_EXAMPLES_NXLINES_BORDERWIDTH=4
 CONFIG_EXAMPLES_NXLINES_BPP=1
-CONFIG_EXAMPLES_NXLINES_EXTERNINIT=y
 CONFIG_EXAMPLES_NXLINES_LINECOLOR=0x01
 CONFIG_EXAMPLES_NXLINES_LINEWIDTH=4
 CONFIG_EXAMPLES_NXLINES=y
@@ -22,11 +21,13 @@ CONFIG_IDLETHREAD_STACKSIZE=2048
 CONFIG_LCD_MAXCONTRAST=255
 CONFIG_LCD_UG2864AMBAG01=y
 CONFIG_LCD=y
-CONFIG_LIB_BOARDCTL=y
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
+CONFIG_MQ_MAXMSGSIZE=64
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
+CONFIG_NX_BLOCKING=y
+CONFIG_NX_MULTIUSER=y
 CONFIG_NX_WRITEONLY=y
 CONFIG_NX=y
 CONFIG_NXFONT_MONO5X8=y
diff --git a/libnx/nxmu/nxmu_sendserver.c b/libnx/nxmu/nxmu_sendserver.c
index 65266a659c..2072ad2894 100644
--- a/libnx/nxmu/nxmu_sendserver.c
+++ b/libnx/nxmu/nxmu_sendserver.c
@@ -86,7 +86,7 @@ int nxmu_sendserver(FAR struct nxfe_conn_s *conn, FAR const void *msg,
   ret = _MQ_SEND(conn->cwrmq, msg, msglen, NX_SVRMSG_PRIO);
   if (ret < 0)
     {
-      gerr("ERROR: _MQ_SEND failed: %d\n", _MQ_ERRNO(rer));
+      gerr("ERROR: _MQ_SEND failed: %d\n", _MQ_GETERRNO(ret));
     }
 
   return ret;