diff --git a/software/firmware/source/SoftRF/src/driver/radio/nordic.cpp b/software/firmware/source/SoftRF/src/driver/radio/nordic.cpp
index ec23ca7aa..27d68e793 100644
--- a/software/firmware/source/SoftRF/src/driver/radio/nordic.cpp
+++ b/software/firmware/source/SoftRF/src/driver/radio/nordic.cpp
@@ -66,7 +66,8 @@ static bool nrf905_probe()
 
   SoC->SPI_begin();
 
-#if defined(ARDUINO) && !defined(RASPBERRY_PI) && !defined(ARDUINO_ARCH_MBED)
+#if defined(ARDUINO)           && !defined(RASPBERRY_PI) && \
+   !defined(ARDUINO_ARCH_MBED) && !defined(ARDUINO_ARCH_ZEPHYR)
   RadioSPI.setClockDivider(SPI_CLOCK_DIV2);
 #endif /* ARDUINO */
 
diff --git a/software/firmware/source/SoftRF/src/platform/nRF52.h b/software/firmware/source/SoftRF/src/platform/nRF52.h
index 3a4ae4116..deecd3f3e 100644
--- a/software/firmware/source/SoftRF/src/platform/nRF52.h
+++ b/software/firmware/source/SoftRF/src/platform/nRF52.h
@@ -16,13 +16,14 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#if defined(ARDUINO_ARCH_NRF52) || defined(ARDUINO_ARCH_NRF52840)
+#if defined(ARDUINO_ARCH_NRF52)  || defined(ARDUINO_ARCH_NRF52840) || \
+   (defined(ARDUINO_ARCH_ZEPHYR) && defined(NRF52840_XXAA))
 
 #ifndef PLATFORM_NRF52_H
 #define PLATFORM_NRF52_H
 
 #include <avr/dtostrf.h>
-#if !defined(ARDUINO_ARCH_MBED)
+#if !defined(ARDUINO_ARCH_MBED) && !defined(ARDUINO_ARCH_ZEPHYR)
 #include <pcf8563.h>
 #endif /* ARDUINO_ARCH_MBED */
 
@@ -53,7 +54,11 @@
 
 #define SerialOutput            Serial1
 #define USBSerial               Serial
+#if !defined(ARDUINO_ARCH_ZEPHYR)
 #define Serial_GNSS_In          Serial2
+#else
+#define Serial_GNSS_In          Serial1 /* TBD */
+#endif /* ARDUINO_ARCH_ZEPHYR */
 #define Serial_GNSS_Out         Serial_GNSS_In
 #define UATSerial               Serial1
 
@@ -258,7 +263,7 @@ struct rst_info {
 #define USE_OGN_ENCRYPTION
 #define ENABLE_ADSL
 #define ENABLE_PROL
-#if !defined(ARDUINO_ARCH_MBED)
+#if !defined(ARDUINO_ARCH_MBED) && !defined(ARDUINO_ARCH_ZEPHYR)
 #define USE_BLE_MIDI
 #define ENABLE_REMOTE_ID
 #define USE_EXT_I2S_DAC
@@ -277,6 +282,11 @@ struct rst_info {
 #define USE_ARDUINOBLE
 #define EXCLUDE_IMU
 #define EXCLUDE_BME280AUX
+#if defined(ARDUINO_ARCH_ZEPHYR)
+#define EXCLUDE_BLUETOOTH
+#define EXCLUDE_EEPROM
+#undef USE_NMEALIB
+#endif /* ARDUINO_ARCH_ZEPHYR */
 #endif /* ARDUINO_ARCH_MBED */
 //#define EXCLUDE_PMU
 
@@ -302,11 +312,11 @@ struct rst_info {
 extern Adafruit_NeoPixel strip;
 #endif /* EXCLUDE_LED_RING */
 
-#if !defined(PIN_SERIAL2_RX) && !defined(PIN_SERIAL2_TX)
+#if !defined(PIN_SERIAL2_RX) && !defined(PIN_SERIAL2_TX) && !defined(ARDUINO_ARCH_ZEPHYR)
 extern Uart Serial2;
 #endif
 
-#if !defined(ARDUINO_ARCH_MBED)
+#if !defined(ARDUINO_ARCH_MBED) && !defined(ARDUINO_ARCH_ZEPHYR)
 extern PCF8563_Class *rtc;
 #endif /* ARDUINO_ARCH_MBED */
 extern const char *nRF52_Device_Manufacturer, *nRF52_Device_Model, *Hardware_Rev[];
diff --git a/software/firmware/source/SoftRF/src/system/SoC.cpp b/software/firmware/source/SoftRF/src/system/SoC.cpp
index 73d76c1db..0f0705e28 100644
--- a/software/firmware/source/SoftRF/src/system/SoC.cpp
+++ b/software/firmware/source/SoftRF/src/system/SoC.cpp
@@ -34,7 +34,8 @@ byte SoC_setup()
   SoC = &STM32_ops;
 #elif defined(__ASR6501__) || defined(ARDUINO_ARCH_ASR650X)
   SoC = &PSoC4_ops;
-#elif defined(ARDUINO_ARCH_NRF52) || defined(ARDUINO_ARCH_NRF52840)
+#elif defined(ARDUINO_ARCH_NRF52) || defined(ARDUINO_ARCH_NRF52840) || \
+     (defined(ARDUINO_ARCH_ZEPHYR) && defined(NRF52840_XXAA))
   SoC = &nRF52_ops;
 #elif defined(HACKRF_ONE)
   SoC = &LPC43_ops;
diff --git a/software/firmware/source/SoftRF/src/system/SoC.h b/software/firmware/source/SoftRF/src/system/SoC.h
index 6e3a1a3d8..f43559481 100644
--- a/software/firmware/source/SoftRF/src/system/SoC.h
+++ b/software/firmware/source/SoftRF/src/system/SoC.h
@@ -140,7 +140,8 @@ extern const SoC_ops_t STM32_ops;
 #if defined(__ASR6501__) || defined(ARDUINO_ARCH_ASR650X)
 extern const SoC_ops_t PSoC4_ops;
 #endif
-#if defined(ARDUINO_ARCH_NRF52) || defined(ARDUINO_ARCH_NRF52840)
+#if defined(ARDUINO_ARCH_NRF52) || defined(ARDUINO_ARCH_NRF52840) || \
+   (defined(ARDUINO_ARCH_ZEPHYR) && defined(NRF52840_XXAA))
 extern const SoC_ops_t nRF52_ops;
 #endif
 #if defined(HACKRF_ONE)
diff --git a/software/firmware/source/libraries/Adafruit_BMP280_Library/Adafruit_BMP280.h b/software/firmware/source/libraries/Adafruit_BMP280_Library/Adafruit_BMP280.h
index b758b7799..b7f76eb43 100644
--- a/software/firmware/source/libraries/Adafruit_BMP280_Library/Adafruit_BMP280.h
+++ b/software/firmware/source/libraries/Adafruit_BMP280_Library/Adafruit_BMP280.h
@@ -30,7 +30,8 @@
       defined(ARDUINO_ARCH_SAMD)    || defined(ARDUINO_ARCH_AVR)      || \
       defined(ARDUINO_ARCH_RP2040)  || defined(HACKRF_ONE)            || \
       defined(ARDUINO_ARCH_RENESAS) || defined(ARDUINO_ARCH_SILABS)   || \
-      defined(ARDUINO_ARCH_CH32))   || defined(ARDUINO_ARCH_RP2350)
+      defined(ARDUINO_ARCH_CH32)    || defined(ARDUINO_ARCH_RP2350)   || \
+      defined(ARDUINO_ARCH_ZEPHYR))
 #include <Adafruit_Sensor.h>
 #endif
 
diff --git a/software/firmware/source/libraries/OGN/manchester.h b/software/firmware/source/libraries/OGN/manchester.h
index fcaeb03a0..e6b793fcb 100644
--- a/software/firmware/source/libraries/OGN/manchester.h
+++ b/software/firmware/source/libraries/OGN/manchester.h
@@ -6,7 +6,8 @@
    (defined(ARDUINO_ARCH_RP2040)   && defined(ARDUINO_ARCH_MBED))  || \
    (defined(ARDUINO_ARCH_NRF52840) && defined(ARDUINO_ARCH_MBED))  || \
     defined(ARDUINO_ARCH_RENESAS)  || defined(ARDUINO_ARCH_SAMD)   || \
-    defined(ARDUINO_ARCH_SILABS)   || defined(ARDUINO_ARCH_CH32)
+    defined(ARDUINO_ARCH_SILABS)   || defined(ARDUINO_ARCH_CH32)   || \
+    defined(ARDUINO_ARCH_ZEPHYR)
 #include <avr/pgmspace.h>
 #endif
 
diff --git a/software/firmware/source/libraries/libmodes/src/mode-s.c b/software/firmware/source/libraries/libmodes/src/mode-s.c
index ecd9b8686..64450aa31 100644
--- a/software/firmware/source/libraries/libmodes/src/mode-s.c
+++ b/software/firmware/source/libraries/libmodes/src/mode-s.c
@@ -46,7 +46,8 @@
 
 static mag_t maglut[129*129];
 
-#if (defined(ENERGIA_ARCH_CC13X2) || defined(ARDUINO_ARCH_SILABS)) && !defined(M_PI)
+#if (defined(ENERGIA_ARCH_CC13X2)  ||  defined(ARDUINO_ARCH_SILABS) || \
+     defined(ARDUINO_ARCH_ZEPHYR)) && !defined(M_PI)
 #define M_PI                  3.14159265358979323846
 #endif /* ENERGIA_ARCH_CC13X2 */
 #else
diff --git a/software/firmware/source/libraries/nRF905/nRF905.cpp b/software/firmware/source/libraries/nRF905/nRF905.cpp
index 1e58af3f0..49eb7c811 100644
--- a/software/firmware/source/libraries/nRF905/nRF905.cpp
+++ b/software/firmware/source/libraries/nRF905/nRF905.cpp
@@ -15,7 +15,7 @@
     !defined(ARDUINO_ARCH_ASR650X) && !defined(ARDUINO_ARCH_ASR6601)  && \
     !defined(ARDUINO_ARCH_RP2040)  && !defined(ARDUINO_ARCH_RENESAS)  && \
     !defined(ARDUINO_ARCH_SILABS)  && !defined(ARDUINO_ARCH_CH32)     && \
-    !defined(ARDUINO_ARCH_RP2350)
+    !defined(ARDUINO_ARCH_RP2350)  && !defined(ARDUINO_ARCH_ZEPHYR)
 
 #include <avr/io.h>
 #include <avr/interrupt.h>
@@ -32,6 +32,7 @@
     defined(ARDUINO_ARCH_SAMD)    || defined(ARDUINO_ARCH_RP2040)   || \
     defined(ARDUINO_ARCH_RENESAS) || defined(ARDUINO_ARCH_SILABS)   || \
     defined(ARDUINO_ARCH_CH32)    || defined(ARDUINO_ARCH_RP2350)   || \
+    defined(ARDUINO_ARCH_ZEPHYR)  || \
    (defined(ARDUINO_ARCH_STM32) && defined(ARDUINO_WisDuo_RAK3172_Evaluation_Board))
 #define _BV(bit) (1 << (bit))
 #endif /* ENERGIA_ARCH_CC13XX || ENERGIA_ARCH_CC13X2 || ARDUINO_ARCH_NRF52 */
@@ -190,7 +191,7 @@ void nRF905_init()
     !defined(ARDUINO_ARCH_ASR650X) && !defined(ARDUINO_ARCH_ASR6601) && \
     !defined(ARDUINO_ARCH_RP2040)  && !defined(ARDUINO_ARCH_RENESAS) && \
     !defined(ARDUINO_ARCH_SILABS)  && !defined(ARDUINO_ARCH_MBED)    && \
-    !defined(ARDUINO_ARCH_RP2350)
+    !defined(ARDUINO_ARCH_RP2350)  && !defined(ARDUINO_ARCH_ZEPHYR)
 	SPI.setClockDivider(SPI_CLOCK_DIV2);
 #endif /* RASPBERRY_PI */
 #else
diff --git a/software/firmware/source/libraries/nRF905/nRF905_config.h b/software/firmware/source/libraries/nRF905/nRF905_config.h
index 5120281f9..33e6bfc7f 100644
--- a/software/firmware/source/libraries/nRF905/nRF905_config.h
+++ b/software/firmware/source/libraries/nRF905/nRF905_config.h
@@ -29,7 +29,8 @@
     defined(ARDUINO_ARCH_ASR650X)  || defined(ARDUINO_ARCH_ASR6601) || \
     defined(ARDUINO_ARCH_RP2040)   || defined(ARDUINO_ARCH_RENESAS) || \
     defined(ARDUINO_ARCH_SILABS)   || defined(ARDUINO_ARCH_CH32)    || \
-    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)
+    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)  || \
+    defined(ARDUINO_ARCH_ZEPHYR)
 #define NRF905_INTERRUPTS	0
 #else
 #define NRF905_INTERRUPTS	1
@@ -58,7 +59,8 @@
     defined(ARDUINO_ARCH_ASR650X)  || defined(ARDUINO_ARCH_ASR6601) || \
     defined(ARDUINO_ARCH_RP2040)   || defined(ARDUINO_ARCH_RENESAS) || \
     defined(ARDUINO_ARCH_SILABS)   || defined(ARDUINO_ARCH_CH32)    || \
-    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)
+    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)  || \
+    defined(ARDUINO_ARCH_ZEPHYR)
 #define NRF905_AM_SW		1
 #else
 #define NRF905_AM_SW		0
@@ -77,7 +79,8 @@
     defined(ARDUINO_ARCH_ASR650X)  || defined(ARDUINO_ARCH_ASR6601) || \
     defined(ARDUINO_ARCH_RP2040)   || defined(ARDUINO_ARCH_RENESAS) || \
     defined(ARDUINO_ARCH_SILABS)   || defined(ARDUINO_ARCH_CH32)    || \
-    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)
+    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)  || \
+    defined(ARDUINO_ARCH_ZEPHYR)
 #define NRF905_COLLISION_AVOID	0
 #else
 #define NRF905_COLLISION_AVOID	1
@@ -204,7 +207,8 @@
 
 #elif defined(ARDUINO_ARCH_SAMD)    || defined(ARDUINO_ARCH_RP2040) || \
       defined(ARDUINO_ARCH_RENESAS) || defined(ARDUINO_ARCH_SILABS) || \
-      defined(ARDUINO_ARCH_CH32)    || defined(ARDUINO_ARCH_RP2350)
+      defined(ARDUINO_ARCH_CH32)    || defined(ARDUINO_ARCH_RP2350) || \
+      defined(ARDUINO_ARCH_ZEPHYR)
 
 // TBD
 #define TRX_EN    0   // Enable/standby pin
@@ -347,7 +351,8 @@
     defined(ARDUINO_ARCH_ASR650X)  || defined(ARDUINO_ARCH_ASR6601) || \
     defined(ARDUINO_ARCH_RP2040)   || defined(ARDUINO_ARCH_RENESAS) || \
     defined(ARDUINO_ARCH_SILABS)   || defined(ARDUINO_ARCH_CH32)    || \
-    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)
+    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)  || \
+    defined(ARDUINO_ARCH_ZEPHYR)
 #define NRF905_FREQ			868400000UL
 #else
 #define NRF905_FREQ			433200000UL
@@ -364,7 +369,8 @@
     defined(ARDUINO_ARCH_ASR650X)  || defined(ARDUINO_ARCH_ASR6601) || \
     defined(ARDUINO_ARCH_RP2040)   || defined(ARDUINO_ARCH_RENESAS) || \
     defined(ARDUINO_ARCH_SILABS)   || defined(ARDUINO_ARCH_CH32)    || \
-    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)
+    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)  || \
+    defined(ARDUINO_ARCH_ZEPHYR)
 #define NRF905_BAND			NRF905_BAND_868
 #else
 #define NRF905_BAND			NRF905_BAND_433
@@ -415,7 +421,8 @@
     defined(ARDUINO_ARCH_ASR650X)  || defined(ARDUINO_ARCH_ASR6601) || \
     defined(ARDUINO_ARCH_RP2040)   || defined(ARDUINO_ARCH_RENESAS) || \
     defined(ARDUINO_ARCH_SILABS)   || defined(ARDUINO_ARCH_CH32)    || \
-    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)
+    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)  || \
+    defined(ARDUINO_ARCH_ZEPHYR)
 #define NRF905_ADDR_SIZE	NRF905_ADDR_SIZE_3
 //#define NRF905_ADDR_SIZE	NRF905_ADDR_SIZE_2
 #else
@@ -430,7 +437,8 @@
     defined(ARDUINO_ARCH_ASR650X)  || defined(ARDUINO_ARCH_ASR6601) || \
     defined(ARDUINO_ARCH_RP2040)   || defined(ARDUINO_ARCH_RENESAS) || \
     defined(ARDUINO_ARCH_SILABS)   || defined(ARDUINO_ARCH_CH32)    || \
-    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)
+    defined(ARDUINO_ARCH_NRF52840) || defined(ARDUINO_ARCH_RP2350)  || \
+    defined(ARDUINO_ARCH_ZEPHYR)
 #define NRF905_PAYLOAD_SIZE	24
 #else
 #define NRF905_PAYLOAD_SIZE	32 //NRF905_MAX_PAYLOAD
diff --git a/software/firmware/source/libraries/nmealib/src/local.h b/software/firmware/source/libraries/nmealib/src/local.h
index f7f54b0d4..11214f236 100644
--- a/software/firmware/source/libraries/nmealib/src/local.h
+++ b/software/firmware/source/libraries/nmealib/src/local.h
@@ -4,7 +4,7 @@
 
 #if !defined(ENERGIA_ARCH_CC13XX) && !defined(ENERGIA_ARCH_CC13X2)   && \
     !defined(ARDUINO_ARCH_NRF52)  && !defined(ARDUINO_ARCH_NRF52840) && \
-    !defined(ARDUINO_ARCH_SAMD)
+    !defined(ARDUINO_ARCH_SAMD)   && !defined(ARDUINO_ARCH_ZEPHYR)
 #include <pgmspace.h>
 #if defined(ARDUINO_ARCH_ESP32)
 #include "esp_idf_version.h"
@@ -19,7 +19,7 @@
 #else
 #include <avr/pgmspace.h>
 #if defined(ARDUINO_ARCH_NRF52) || defined(ARDUINO_ARCH_NRF52840) || \
-    defined(ARDUINO_ARCH_SAMD)
+    defined(ARDUINO_ARCH_SAMD)  || defined(ARDUINO_ARCH_ZEPHYR)
 #define	_AND		,
 #define	_CONST		const
 #define	_EXFUN(name, proto)		name proto