diff --git a/examples/TCP/EthernetModbusServerLED/EthernetModbusServerLED.ino b/examples/TCP/EthernetModbusServerLED/EthernetModbusServerLED.ino
index bedc2b7..06f6590 100644
--- a/examples/TCP/EthernetModbusServerLED/EthernetModbusServerLED.ino
+++ b/examples/TCP/EthernetModbusServerLED/EthernetModbusServerLED.ino
@@ -14,6 +14,9 @@
 
 #include <SPI.h>
 #include <Ethernet.h>
+#if defined(ARDUINO_ARCH_ZEPHYR)
+#include <ZephyrServer.h>
+#endif
 
 #include <ArduinoRS485.h> // ArduinoModbus depends on the ArduinoRS485 library
 #include <ArduinoModbus.h>
@@ -26,7 +29,11 @@ byte mac[] = {
 };
 IPAddress ip(192, 168, 1, 177);
 
+#if defined(ARDUINO_ARCH_ZEPHYR)
+ZephyrServer ethServer(502);
+#else
 EthernetServer ethServer(502);
+#endif
 
 ModbusTCPServer modbusTCPServer;
 
@@ -81,8 +88,12 @@ void setup() {
 
 void loop() {
   // listen for incoming clients
+#if defined(ARDUINO_ARCH_ZEPHYR)
+  EthernetClient client = ethServer.accept();
+#else
   EthernetClient client = ethServer.available();
-  
+#endif
+
   if (client) {
     // a new client connected
     Serial.println("new client");
diff --git a/examples/TCP/WiFiModbusClientToggle/WiFiModbusClientToggle.ino b/examples/TCP/WiFiModbusClientToggle/WiFiModbusClientToggle.ino
index 0322c89..ba8884e 100644
--- a/examples/TCP/WiFiModbusClientToggle/WiFiModbusClientToggle.ino
+++ b/examples/TCP/WiFiModbusClientToggle/WiFiModbusClientToggle.ino
@@ -12,8 +12,12 @@
 */
 
 #include <SPI.h>
+#if defined(ARDUINO_ARCH_ZEPHYR)
+#include <WiFi.h>
+#else
 #include <WiFiNINA.h> // for MKR WiFi 1010
 // #include <WiFi101.h> // for MKR1000
+#endif
 
 #include <ArduinoRS485.h> // ArduinoModbus depends on the ArduinoRS485 library
 #include <ArduinoModbus.h>
diff --git a/examples/TCP/WiFiModbusServerLED/WiFiModbusServerLED.ino b/examples/TCP/WiFiModbusServerLED/WiFiModbusServerLED.ino
index 60276c0..27f0f0d 100644
--- a/examples/TCP/WiFiModbusServerLED/WiFiModbusServerLED.ino
+++ b/examples/TCP/WiFiModbusServerLED/WiFiModbusServerLED.ino
@@ -12,8 +12,13 @@
 */
 
 #include <SPI.h>
+#if defined(ARDUINO_ARCH_ZEPHYR)
+#include <WiFi.h>
+#include <ZephyrServer.h>
+#else
 #include <WiFiNINA.h> // for MKR WiFi 1010
 // #include <WiFi101.h> // for MKR1000
+#endif
 
 #include <ArduinoRS485.h> // ArduinoModbus depends on the ArduinoRS485 library
 #include <ArduinoModbus.h>
@@ -28,7 +33,11 @@ const int ledPin = LED_BUILTIN;
 
 int status = WL_IDLE_STATUS;
 
+#if defined(ARDUINO_ARCH_ZEPHYR)
+ZephyrServer wifiServer(502);
+#else
 WiFiServer wifiServer(502);
+#endif
 
 ModbusTCPServer modbusTCPServer;
 
@@ -74,8 +83,12 @@ void setup() {
 
 void loop() {
   // listen for incoming clients
+#if defined(ARDUINO_ARCH_ZEPHYR)
+  WiFiClient client = wifiServer.accept();
+#else
   WiFiClient client = wifiServer.available();
-  
+#endif
+
   if (client) {
     // a new client connected
     Serial.println("new client");
diff --git a/library.properties b/library.properties
index 84aace6..4a82667 100644
--- a/library.properties
+++ b/library.properties
@@ -6,6 +6,6 @@ sentence=Use Modbus equipment with your Arduino.
 paragraph=Using TCP or RS485 shields, like the MKR 485 Shield. This library depends on the ArduinoRS485 library.
 category=Communication
 url=https://www.arduino.cc/en/ArduinoModbus/ArduinoModbus
-architectures=megaavr,samd,mbed_nano,mbed_portenta,mbed_opta
+architectures=megaavr,samd,mbed_nano,mbed_portenta,mbed_opta,zephyr,zephyr_main,zephyr_contrib
 includes=ArduinoModbus.h
 depends=ArduinoRS485
diff --git a/src/ModbusClient.cpp b/src/ModbusClient.cpp
index bf4b329..b7dc982 100644
--- a/src/ModbusClient.cpp
+++ b/src/ModbusClient.cpp
@@ -411,7 +411,7 @@ const char* ModbusClient::lastError()
     return NULL;
   }
 
-  return modbus_strerror(errno); 
+  return modbus_strerror(errno);
 }
 
 void ModbusClient::setTimeout(unsigned long ms)
diff --git a/src/libmodbus/modbus-private.h b/src/libmodbus/modbus-private.h
index 79e7b93..663df70 100644
--- a/src/libmodbus/modbus-private.h
+++ b/src/libmodbus/modbus-private.h
@@ -20,6 +20,7 @@ struct timeval {
     uint32_t tv_usec;
 };
 #else
+# include <sys/select.h>
 # include <sys/time.h>
 #endif
 #else
diff --git a/src/libmodbus/modbus.c b/src/libmodbus/modbus.c
index 3afeb3b..2bf59e7 100644
--- a/src/libmodbus/modbus.c
+++ b/src/libmodbus/modbus.c
@@ -25,6 +25,7 @@
 #ifndef DEBUG
 #define printf(...) {}
 #define fprintf(...) {}
+#define vfprintf(...) {}
 #endif
 #endif