diff --git a/boards.txt b/boards.txt
index 31c50cfa..b6dec4e8 100644
--- a/boards.txt
+++ b/boards.txt
@@ -275,6 +275,54 @@ Gnat-L082CZ.menu.opt.o3=Fastest
 Gnat-L082CZ.menu.opt.o3.build.flags.optimize=-O3
 Gnat-L082CZ.menu.opt.o3.build.flags.ldspecs=
 
+# Arduino MKRWAN 1300
+# ---------------------------------------
+mkrwan.name=Arduino MKRWAN 1300
+mkrwan.vid.0=0x0483
+mkrwan.pid.0=0x374b
+
+mkrwan.upload.tool=stm32flash
+mkrwan.upload.protocol=
+mkrwan.upload.maximum_size=196608
+mkrwan.upload.maximum_data_size=20480
+mkrwan.upload.use_1200bps_touch=false
+mkrwan.upload.wait_for_upload_port=false
+mkrwan.upload.native_usb=false
+
+mkrwan.build.mcu=cortex-m0plus
+mkrwan.build.f_cpu=32000000L
+mkrwan.build.board=STM32L0_B_L072Z_LRWAN1
+mkrwan.build.arch=stm32l0
+mkrwan.build.core=arduino
+mkrwan.build.vid=0x0483
+mkrwan.build.pid=0x374b
+mkrwan.build.did=0xffff
+mkrwan.build.extra_flags=-DSTM32L072xx -march=armv6-m -mthumb -mabi=aapcs -mfloat-abi=soft -fsingle-precision-constant
+mkrwan.build.ldscript=linker_scripts/STM32L072CZ_FLASH.ld
+mkrwan.build.openocdscript=openocd_scripts/b-l072z-lrwan1.cfg
+mkrwan.build.variant=B-L072Z-LRWAN1
+mkrwan.build.variant_system_libs="-L{runtime.platform.path}/system/STM32L0xx/Lib" "-L{runtime.platform.path}/system/CMSIS/Lib" -lstm32l072xx -larm_cortexM0l_math
+mkrwan.build.variant_system_include="-I{runtime.platform.path}/system/CMSIS/Include" "-I{runtime.platform.path}/system/CMSIS/Device/ST/STM32L0xx/Include" "-I{runtime.platform.path}/system/STM32L0xx/Include" 
+
+mkrwan.menu.speed.32=32 MHz
+mkrwan.menu.speed.32.build.f_cpu=32000000L
+mkrwan.menu.speed.16=16 MHz (No USB)
+mkrwan.menu.speed.16.build.f_cpu=16000000L
+mkrwan.menu.speed.4=4.2 MHz (No USB)
+mkrwan.menu.speed.4.build.f_cpu=4200000L
+
+mkrwan.menu.opt.os=Smallest Code
+mkrwan.menu.opt.os.build.flags.optimize=-Os
+mkrwan.menu.opt.os.build.flags.ldspecs=--specs=nano.specs
+mkrwan.menu.opt.o1=Fast
+mkrwan.menu.opt.o1.build.flags.optimize=-O1
+mkrwan.menu.opt.o1.build.flags.ldspecs=
+mkrwan.menu.opt.o2=Faster
+mkrwan.menu.opt.o2.build.flags.optimize=-O2
+mkrwan.menu.opt.o2.build.flags.ldspecs=
+mkrwan.menu.opt.o3=Fastest
+mkrwan.menu.opt.o3.build.flags.optimize=-O3
+mkrwan.menu.opt.o3.build.flags.ldspecs=
 
 # ST B-L072Z-LRWAN1
 # ---------------------------------------
diff --git a/cores/arduino/Uart.h b/cores/arduino/Uart.h
index 622845d4..a94cc634 100644
--- a/cores/arduino/Uart.h
+++ b/cores/arduino/Uart.h
@@ -29,6 +29,7 @@
 #pragma once
 
 #include "HardwareSerial.h"
+#include "Callback.h"
 
 #define UART_RX_BUFFER_SIZE 64
 #define UART_TX_BUFFER_SIZE 64
diff --git a/libraries/STM32L0/examples/MKRWANBridge/MKRWANBridge.ino b/libraries/STM32L0/examples/MKRWANBridge/MKRWANBridge.ino
new file mode 100644
index 00000000..10e296b8
--- /dev/null
+++ b/libraries/STM32L0/examples/MKRWANBridge/MKRWANBridge.ino
@@ -0,0 +1,79 @@
+/*
+  MKRWAN Bridge
+  This sketch needs to be flashed on a MKR WAN 1300 to allow using the board as an STM32L0 target.
+  Once flashed using Arduino SAMD core, select Arduino MKRWAN 1300 target from STM32L0 core.
+
+  This example code is in the public domain.
+*/
+
+int baud = 115200;
+uint8_t parity = 0;
+
+void setup() {
+  Serial.begin(baud);
+  pinMode(LED_BUILTIN, OUTPUT);
+}
+
+char rx_buf[512];
+char tx_buf[512];
+
+int rx = 0;
+int tx = 0;
+
+void doStuff() {
+  if (Serial.baud() != baud) {
+    baud = Serial.baud();
+    if (baud == 2400) {
+      digitalWrite(LORA_BOOT0, HIGH);
+      pinMode(LORA_BOOT0, OUTPUT);
+      digitalWrite(LORA_BOOT0, HIGH);
+      pinMode(LORA_RESET, OUTPUT);
+      digitalWrite(LORA_RESET, HIGH);
+      delay(100);
+      digitalWrite(LORA_RESET, LOW);
+      delay(100);
+      digitalWrite(LORA_RESET, HIGH);
+      Serial2.begin(115200, SERIAL_8E1);
+      while (Serial2.available()) {
+        Serial2.read();
+      }
+      digitalWrite(LED_BUILTIN, HIGH);
+    } else {
+      Serial2.begin(baud, SERIAL_8N1);
+      pinMode(LORA_BOOT0, OUTPUT);
+      digitalWrite(LORA_BOOT0, LOW);
+      pinMode(LORA_RESET, OUTPUT);
+      digitalWrite(LORA_RESET, HIGH);
+      delay(100);
+      digitalWrite(LORA_RESET, LOW);
+      delay(100);
+      digitalWrite(LORA_RESET, HIGH);
+      digitalWrite(LED_BUILTIN, LOW);
+    }
+  }
+}
+
+void loop() {
+
+  doStuff();
+
+  while (Serial.available()) {      // If anything comes in Serial (USB),
+    tx_buf[tx++] = Serial.read();   // read it and send it out Serial1 (pins 0 & 1)
+  }
+
+  if (tx > 0) {
+    Serial2.write(tx_buf, tx);
+    tx = 0;
+  }
+
+  while (Serial2.available()) {      // If anything comes in Serial (USB),
+    rx_buf[rx++] = Serial2.read();   // read it and send it out Serial1 (pins 0 & 1)
+  }
+
+  if (rx > 0) {
+    Serial.write(rx_buf, rx);
+    rx = 0;
+  }
+
+
+}
diff --git a/platform.txt b/platform.txt
index 9dcaea51..8f9b847e 100644
--- a/platform.txt
+++ b/platform.txt
@@ -141,3 +141,18 @@ tools.stm32l0_openocd.program.pattern="{path}/{cmd}" {program.verbose} -s "{runt
 tools.stm32l0_openocd.erase.params.verbose=-d3
 tools.stm32l0_openocd.erase.params.quiet=-d0
 tools.stm32l0_openocd.erase.pattern=
+
+# STM32FLASH
+tools.stm32flash.cmd=stm32flash
+tools.stm32flash.path={runtime.platform.path}/tools/windows
+tools.stm32flash.path.macosx={runtime.platform.path}/tools/macosx
+tools.stm32flash.path.linux={runtime.platform.path}/tools/linux
+tools.stm32flash.upload.params.verbose=-v
+tools.stm32flash.upload.params.quiet=
+tools.stm32flash.upload.pattern="{path}/{cmd}" {serial.port} -e 512 -b 2400 -w "{build.path}/{build.project_name}.dfu"
+tools.stm32flash.program.params.verbose=-v
+tools.stm32flash.program.params.quiet=
+tools.stm32flash.program.pattern="{path}/{cmd}" {serial.port} -e 512 -b 2400 -w "{build.path}/{build.project_name}.dfu"
+tools.stm32flash.erase.params.verbose=-v
+tools.stm32flash.erase.params.quiet=
+tools.stm32flash.erase.pattern="{path}/{cmd}" {serial.port} -e 512 -b 2400
\ No newline at end of file
diff --git a/tools/linux/stm32flash b/tools/linux/stm32flash
new file mode 100755
index 00000000..c7b527e5
Binary files /dev/null and b/tools/linux/stm32flash differ
diff --git a/tools/macosx/stm32flash b/tools/macosx/stm32flash
new file mode 100755
index 00000000..64aab557
Binary files /dev/null and b/tools/macosx/stm32flash differ
diff --git a/tools/windows/stm32flash.exe b/tools/windows/stm32flash.exe
new file mode 100755
index 00000000..3caabd11
Binary files /dev/null and b/tools/windows/stm32flash.exe differ