diff --git a/ports/nrf/Makefile b/ports/nrf/Makefile
index ae2f895030f7e..563578d1030bf 100644
--- a/ports/nrf/Makefile
+++ b/ports/nrf/Makefile
@@ -6,7 +6,8 @@ $(error Invalid BOARD specified)
 endif
 
 # If SoftDevice is selected, try to use that one.
-SD ?=
+# Default to SD132 (exact version can be set with SOFTDEV_VERSION)
+SD ?= s132
 SD_LOWER = $(shell echo $(SD) | tr '[:upper:]' '[:lower:]')
 
 # TODO: Verify that it is a valid target.
diff --git a/ports/nrf/boards/feather52/README.md b/ports/nrf/boards/feather52/README.md
index d5e00262256a5..c98f54614ff61 100644
--- a/ports/nrf/boards/feather52/README.md
+++ b/ports/nrf/boards/feather52/README.md
@@ -55,6 +55,26 @@ To build a CircuitPython binary with default settings for the
 $ make BOARD=feather52 V=1
 ```
 
+#### REPL over BLE UART (AKA 'NUS')
+
+To build a CircuitPython binary that uses the Nordic UART Service (AKA 'NUS' or
+'BLEUART'), modify `/ports/nrf/bluetooth_conf.h` to have the following macro
+set to `1` in the `#elif (BLUETOOTH_SD == 132)` section:
+
+```
+#define MICROPY_PY_BLE_NUS              (1)
+```
+
+... then build as normal, via:
+
+```
+$ make BOARD=feather52 V=1
+```
+
+You can then connect over BLE UART using an application like Bluefruit LE
+Connect, available for Android, iOS and OS X, or any other application that
+supports the NUS service and allows you to send the corrent EOL sequence.
+
 ## Flashing binaries with `nrfutil`
 
 ### 1. **Update bootloader** to single-bank version
@@ -91,7 +111,7 @@ $ make BOARD=feather52 SERIAL=/dev/tty.SLAB_USBtoUART SOFTDEV_VERSION=5.0.0 boot
 The following command will package and flash the CircuitPython binary using the
 appropriate bootloader mentionned above.
 
-This command assumes you have already build a valid circuitpython
+This command assumes you have already built a valid circuitpython
 image, as described earlier in this readme.
 
 > The name of the serial port target will vary, depending on your OS.
@@ -100,11 +120,12 @@ image, as described earlier in this readme.
 $ make BOARD=feather52 SERIAL=/dev/tty.SLAB_USBtoUART dfu-gen dfu-flash
 ```
 
-If you built your CircuitPython binary with **BLE** support you will need to
-add the `SD=s132` flag as shown below:
+By default, CircuitPython will build with **BLE** support enabled using
+`SD=s132` and the `SOFTDEV_VERSION=2.0.1`. If you wish to specify a different
+SD family or version you can enter the optional fields as shown below:
 
 ```
-$ make BOARD=feather52 SERIAL=/dev/tty.SLAB_USBtoUART SD=s132 dfu-gen dfu-flash
+$ make BOARD=feather52 SERIAL=/dev/tty.SLAB_USBtoUART SD=s132 SOFTDEV_VERSION=5.0.0 dfu-gen dfu-flash
 ```
 
 ## Working with CircuitPython
diff --git a/ports/nrf/boards/feather52/custom_nrf52832_dfu_app_2.0.1.ld b/ports/nrf/boards/feather52/custom_nrf52832_dfu_app_2.0.1.ld
index 183822f92a81c..a1c128e377e2d 100644
--- a/ports/nrf/boards/feather52/custom_nrf52832_dfu_app_2.0.1.ld
+++ b/ports/nrf/boards/feather52/custom_nrf52832_dfu_app_2.0.1.ld
@@ -25,7 +25,7 @@ MEMORY
     FLASH_ISR   (rx) : ORIGIN = 0x0001c000, LENGTH = 0x001000 /* sector 0, 4 KiB */
     FLASH_TEXT  (rx) : ORIGIN = 0x0001d000, LENGTH = 0x03C000 /* APP - ISR, 240 KiB */
     FLASH_FATFS (r)  : ORIGIN = 0x00059000, LENGTH = 0x019000 /* File system 100KB KB */
-    RAM (xrw)        : ORIGIN = 0x200039c0, LENGTH = 0x0c640  /* 49.5 KiB, give 8KiB headroom for softdevice */
+    RAM (xrw)        : ORIGIN = 0x20003000, LENGTH = 0x0D000  /* 52 KiB, give 8KiB headroom for softdevice */
 }
 
 /* produce a link error if there is not this amount of RAM for these sections */
diff --git a/ports/nrf/boards/feather52/examples/ble_scan.py b/ports/nrf/boards/feather52/examples/ble_scan.py
new file mode 100644
index 0000000000000..9cacbe6f42872
--- /dev/null
+++ b/ports/nrf/boards/feather52/examples/ble_scan.py
@@ -0,0 +1,26 @@
+from ubluepy import Scanner, constants
+
+def display_scan_results(scan_entries):
+    for e in scan_entries:
+        print("ADDR:  ", e.addr())
+        print("TYPE:  ", e.addr_type())
+        print("RSSI:  ", e.rssi())
+
+        # Parse the contents of the advertising packet
+        scan = e.getScanData()
+        if scan:
+            for s in scan:
+                # Convert byte array to hex format string
+                hex = ' '.join('0x%02X' % b for b in s[2])
+                # Display enum value and hex string together
+                print('\t{}: {}'.format(s[1], hex))
+
+        # Line break between record sets
+        print("")
+
+# Scan 1s for advertising devices in range
+s = Scanner()
+scan_res = s.scan(1000)
+
+# Display the scan results
+display_scan_results(scan_res)
diff --git a/ports/nrf/drivers/bluetooth/ble_uart.c b/ports/nrf/drivers/bluetooth/ble_uart.c
index cc829750cd7cb..069d71589ba53 100644
--- a/ports/nrf/drivers/bluetooth/ble_uart.c
+++ b/ports/nrf/drivers/bluetooth/ble_uart.c
@@ -30,6 +30,7 @@
 #include "ble_uart.h"
 #include "ringbuffer.h"
 #include "hal/hal_time.h"
+#include "lib/utils/interrupt_char.h"
 
 #if MICROPY_PY_BLE_NUS
 
@@ -105,6 +106,10 @@ int mp_hal_stdin_rx_chr(void) {
     return (int)byte;
 }
 
+bool mp_hal_stdin_any(void) {
+  return !isBufferEmpty(mp_rx_ring_buffer);
+}
+
 void mp_hal_stdout_tx_strn(const char *str, size_t len) {
     uint8_t *buf = (uint8_t *)str;
     size_t send_len;
@@ -141,6 +146,7 @@ STATIC void gap_event_handler(mp_obj_t self_in, uint16_t event_id, uint16_t conn
     } else if (event_id == 17) {         // disconnect event
         self->conn_handle = 0xFFFF;      // invalid connection handle
         m_connected = false;
+        ble_uart_advertise();
     }
 }
 
@@ -153,7 +159,14 @@ STATIC void gatts_event_handler(mp_obj_t self_in, uint16_t event_id, uint16_t at
             m_cccd_enabled = true;
         } else if (ble_uart_char_rx.handle == attr_handle) {
             for (uint16_t i = 0; i < length; i++) {
-                bufferWrite(mp_rx_ring_buffer, data[i]);
+                #if MICROPY_KBD_EXCEPTION
+                if (data[i] == mp_interrupt_char) {
+                    mp_keyboard_interrupt();
+                } else
+                #endif
+                {
+                    bufferWrite(mp_rx_ring_buffer, data[i]);
+                }
             }
         }
     }
diff --git a/ports/nrf/mpconfigport.h b/ports/nrf/mpconfigport.h
index 7e23486adbc0c..6530bb28a23b0 100644
--- a/ports/nrf/mpconfigport.h
+++ b/ports/nrf/mpconfigport.h
@@ -273,8 +273,8 @@ extern const struct _mp_obj_module_t ble_module;
     { MP_ROM_QSTR     (MP_QSTR_utime           ), MP_ROM_PTR(&mp_module_utime)      }, \
     MUSIC_MODULE \
     RANDOM_MODULE \
-    /*BLE_MODULE \
-    UBLUEPY_MODULE \*/
+    BLE_MODULE \
+    UBLUEPY_MODULE \
 
 
 #define MICROPY_PORT_BUILTIN_MODULE_WEAK_LINKS \
diff --git a/ports/nrf/supervisor/serial.c b/ports/nrf/supervisor/serial.c
index 465c8394c5f0c..51e61bce7cc1d 100644
--- a/ports/nrf/supervisor/serial.c
+++ b/ports/nrf/supervisor/serial.c
@@ -32,15 +32,18 @@
 #include "pins.h"
 #include "hal_uart.h"
 
+#if (MICROPY_PY_BLE_NUS)
+#include "ble_uart.h"
+#endif
+
 void serial_init(void) {
-//  uart_init0();
-//
-//  mp_obj_t args[2] = {
-//      MP_OBJ_NEW_SMALL_INT(0),
-//      MP_OBJ_NEW_SMALL_INT(115200),
-//  };
-//  MP_STATE_PORT(pyb_stdio_uart) = machine_hard_uart_type.make_new((mp_obj_t)&machine_hard_uart_type, MP_ARRAY_SIZE(args), 0, args);
 
+#if MICROPY_PY_BLE_NUS
+    ble_uart_init0();
+    while (!ble_uart_enabled()) {
+        ;
+    }
+#else
   hal_uart_init_t param =
   {
       .id           = 0,
@@ -56,6 +59,7 @@ void serial_init(void) {
   };
 
   hal_uart_init( UART_BASE(0), &param);
+#endif
 }
 
 
diff --git a/tools/build_adafruit_bins.sh b/tools/build_adafruit_bins.sh
index 4c5be2c85a131..cf4b48bd22dc9 100755
--- a/tools/build_adafruit_bins.sh
+++ b/tools/build_adafruit_bins.sh
@@ -47,7 +47,7 @@ fi
 for board in $boards; do
     mkdir -p bin/$board/
     if [ $board == "feather52" ]; then
-        cp ports/nrf/build-$board/firmware.bin bin/$board/adafruit-circuitpython-$board-$version.bin
+        cp ports/nrf/build-$board-s132/firmware.bin bin/$board/adafruit-circuitpython-$board-$version.bin
         (( exit_status = exit_status || $? ))
     else
         cp ports/atmel-samd/build-$board/firmware.bin bin/$board/adafruit-circuitpython-$board-$version.bin