diff --git a/Example_Sketches/4_9_ESP_NOW/4_9_ESP_NOW.ino b/Example_Sketches/4_9_ESP_NOW/4_9_ESP_NOW.ino
new file mode 100644
index 0000000..129d656
--- /dev/null
+++ b/Example_Sketches/4_9_ESP_NOW/4_9_ESP_NOW.ino
@@ -0,0 +1,114 @@
+/*
+    ESP-NOW Serial Example - Unicast transmission
+    Lucas Saavedra Vaz - 2024
+    Send data between two ESP32s using the ESP-NOW protocol in one-to-one (unicast) configuration.
+    Note that different MAC addresses are used for different interfaces.
+    The devices can be in different modes (AP or Station) and still communicate using ESP-NOW.
+    The only requirement is that the devices are on the same Wi-Fi channel.
+    Set the peer MAC address according to the device that will receive the data.
+
+    Example setup:
+    - Device 1: AP mode with MAC address F6:12:FA:42:B6:E8
+                Peer MAC address set to the Station MAC address of Device 2 (F4:12:FA:40:64:4C)
+    - Device 2: Station mode with MAC address F4:12:FA:40:64:4C
+                Peer MAC address set to the AP MAC address of Device 1 (F6:12:FA:42:B6:E8)
+
+    The device running this sketch will also receive and print data from any device that has its MAC address set as the peer MAC address.
+    To properly visualize the data being sent, set the line ending in the Serial Monitor to "Both NL & CR".
+*/
+
+#include "ESP32_NOW_Serial.h"
+#include "MacAddress.h"
+#include "WiFi.h"
+
+#include "esp_wifi.h"
+
+#define DEFAULT_MODE        WIFI_MODE_STA
+//#define DEFAULT_MODE        WIFI_MODE_AP
+#define DEFAULT_CHANNEL     1
+
+// Set the MAC address of the device that will receive the data
+const MacAddress macDev1({0x48, 0xE7, 0x29, 0x9A, 0xD6, 0x88});
+const MacAddress macDev2({0xE0, 0x5A, 0x1B, 0xD8, 0x8F, 0x14});
+
+const char * wifiApSsid = "SoftAP";
+const char * wifiApPassword = "Password";
+
+ESP_NOW_Serial_Class * nowSerial;
+
+void setup()
+{
+    int32_t channel;
+    wifi_interface_t interface;
+    MacAddress macLocal;
+    MacAddress macPeer;
+    wifi_mode_t mode;
+
+    Serial.begin(115200);
+    Serial.printf("\r\n");
+    Serial.printf("%s\r\n", __FILE__);
+
+    // Determine the WiFi mode
+    mode = WiFi.getMode();
+    if (mode == 0)
+    {
+        mode = DEFAULT_MODE;
+        if (mode == WIFI_MODE_AP)
+            WiFi.softAP(wifiApSsid, wifiApPassword);
+        else
+            WiFi.mode(mode);
+    }
+    Serial.printf("WiFi Mode: %s\r\n", (mode == WIFI_MODE_AP) ? "AP" : "Station");
+
+    // Determine the interface
+    interface = (mode == WIFI_MODE_AP) ? WIFI_IF_AP : WIFI_IF_STA;
+
+    // Determine the WiFi channel
+    channel = WiFi.channel();
+    if (channel == 0)
+    {
+        channel = DEFAULT_CHANNEL;
+        WiFi.setChannel(channel, WIFI_SECOND_CHAN_NONE);
+    }
+    Serial.printf("Channel: %d\r\n", channel);
+
+    // Start WiFi if not already running
+    while (!(WiFi.STA.started() || WiFi.AP.started()))
+    {
+        delay(100);
+    }
+
+    // Get the local MAC address
+    macLocal = (mode == WIFI_MODE_AP) ? WiFi.softAPmacAddress() : WiFi.macAddress();
+    Serial.printf("MAC Address: %s\r\n", macLocal.toString().c_str());
+
+    // Determine the peer MAC address
+    macPeer = (macLocal == macDev1) ? macDev2 : macDev1;
+
+    // Create the ESPNow serial object
+    nowSerial = new ESP_NOW_Serial_Class(macPeer, channel, interface);
+
+    // Start the ESP-NOW communication
+    Serial.println("ESP-NOW communication starting...");
+    nowSerial->begin(115200);
+    Serial.println("You can now send data to the peer device using the Serial Monitor.\n");
+}
+
+void loop()
+{
+    while (nowSerial->available())
+    {
+        Serial.write(nowSerial->read());
+    }
+
+    while (Serial.available() && nowSerial->availableForWrite())
+    {
+        if (nowSerial->write(Serial.read()) <= 0)
+        {
+          Serial.println("Failed to send data");
+          break;
+        }
+    }
+
+    delay(1);
+}
diff --git a/Example_Sketches/4_9_ESP_NOW/makefile b/Example_Sketches/4_9_ESP_NOW/makefile
new file mode 100644
index 0000000..5c4c15f
--- /dev/null
+++ b/Example_Sketches/4_9_ESP_NOW/makefile
@@ -0,0 +1,179 @@
+######################################################################
+# makefile
+#
+# Builds the example
+######################################################################
+
+##########
+# Source files
+##########
+
+EXAMPLE_SKETCH=4_9_ESP_NOW
+
+EXECUTABLES += example
+
+PARTITION_CSV_FILE=RTKEverywhere
+
+ifeq ($(OS),Windows_NT)
+# Windows NT utilities
+CLEAR=cls
+COPY=copy
+DELETE=rmdir /s
+DIR_LISTING=dir
+TERMINAL_APP=
+TERMINAL_PORT="COM3"
+TERMINAL_PARAMS=
+
+# Windows NT generic paths
+USER_DIRECTORY_PATH=C:\Users\$(USERNAME)
+ARDUINO_LIBRARY_PATH=$(USER_DIRECTORY_PATH)\Documents\Arduino\libraries
+HOME_BOARD_PATH=$(USER_DIRECTORY_PATH)\AppData\Local\Arduino15\packages\esp32
+PATCH_SRC_PATH=Patch\
+
+# Windows NT patch source paths
+PARTITION_SRC_PATH=..\$(PARTITION_CSV_FILE).csv
+PATCH_SRC_PATH=Patch\
+
+# Windows NT patch destination paths
+BLE_PATCH_DST_PATH=$(ARDUINO_LIBRARY_PATH)\ESP32_BleSerial\src\
+MBED_LIB_DEST_PATH=$(HOME_BOARD_PATH)\tools\esp32-arduino-libs\${{ env.ESP_IDF }}\esp32/lib\
+PARTITION_DST_PATH=$(HOME_BOARD_PATH)\hardware\esp32\$(ESP_CORE_VERSION)\tools\partitions\$(PARTITION_CSV_FILE).csv
+
+else
+# Linux utilities
+CLEAR=clear
+COPY=cp
+DELETE=rm -Rf
+DIR_LISTING=ls
+TERMINAL_APP=minicom
+#TERMINAL_PORT="/dev/ttyACM1"
+TERMINAL_PORT="/dev/ttyUSB0"
+TERMINAL_PARAMS=-b 115200 -8 < /dev/tty
+
+# Linux generic paths
+USER_DIRECTORY_PATH=~
+ARDUINO_LIBRARY_PATH=$(USER_DIRECTORY_PATH)/Arduino/libraries
+ESP_IDF_PATH=$(HOME_BOARD_PATH)/tools/esp32-arduino-libs
+HOME_BOARD_PATH=$(USER_DIRECTORY_PATH)/.arduino15/packages/esp32
+
+# Linux patch source paths
+PARTITION_SRC_PATH=../$(PARTITION_CSV_FILE).csv
+PATCH_SRC_PATH=Patch/
+
+# Linux patch destination paths
+BLE_PATCH_DST_PATH=$(ARDUINO_LIBRARY_PATH)/ESP32_BleSerial/src/
+MBED_LIB_DEST_PATH=$(ESP_IDF_PATH)/$(ESP_IDF_VERSION)/esp32/lib/
+PARTITION_DST_PATH=$(HOME_BOARD_PATH)/hardware/esp32/$(ESP_CORE_VERSION)/tools/partitions/$(PARTITION_CSV_FILE).csv
+
+endif
+
+##########
+# Buid all the sources - must be first
+##########
+
+.PHONY: all
+
+all: $(EXECUTABLES)
+
+##########
+# Add ESP32 board support
+##########
+
+.PHONY: arduino-config
+
+arduino-config:
+	arduino-cli config init --overwrite --additional-urls "https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json,https://espressif.github.io/arduino-esp32/package_esp32_dev_index.json"
+
+##########
+# Build an example
+##########
+
+.PHONY: example
+
+example:	build/esp32.esp32.esp32/$(EXAMPLE_SKETCH).ino.bin
+
+DEBUG_LEVEL=none
+#DEBUG_LEVEL=debug
+PSRAM=disabled
+#PSRAM=enabled
+
+build/esp32.esp32.esp32/$(EXAMPLE_SKETCH).ino.bin:	$(EXAMPLE_SKETCH).ino   *.ino   makefile
+	$(CLEAR)
+	arduino-cli compile --fqbn "esp32:esp32:esp32":DebugLevel=$(DEBUG_LEVEL),PSRAM=$(PSRAM) $< \
+		--warnings default \
+		--build-property build.partitions=$(PARTITION_CSV_FILE) \
+		--build-property upload.maximum_size=6291456 \
+		--build-property "compiler.cpp.extra_flags=-MMD -c \"-DPOINTPERFECT_TOKEN=$(POINTPERFECT_TOKEN)\" \"-DFIRMWARE_VERSION_MAJOR=$(FIRMWARE_VERSION_MAJOR)\" \"-DFIRMWARE_VERSION_MINOR=$(FIRMWARE_VERSION_MINOR)\" \"-DENABLE_DEVELOPER=$(ENABLE_DEVELOPER)\"" \
+		--export-binaries
+
+##########
+# Upload the example
+##########
+
+ESPTOOL_PATH=~/Arduino/hardware/espressif/esp32/tools/esptool
+#UPLOAD_SPEED=460800
+UPLOAD_SPEED=921600
+BOOT_LOADER_PATH=~/SparkFun/SparkFun_RTK_Firmware_Uploader/RTK_Firmware_Uploader/resource
+
+.PHONY: upload
+
+upload:	build/esp32.esp32.esp32/$(EXAMPLE_SKETCH).ino.bin
+	python3 $(ESPTOOL_PATH)/esptool.py \
+        --chip   esp32 \
+        --port   $(TERMINAL_PORT) \
+        --baud   $(UPLOAD_SPEED) \
+        --before   default_reset \
+        --after   hard_reset \
+        write_flash \
+        --flash_mode dio \
+        --flash_freq 80m \
+        --flash_size detect \
+        --compress \
+         0x1000   $(BOOT_LOADER_PATH)/RTK_Surveyor.ino.bootloader.bin \
+         0x8000   $(BOOT_LOADER_PATH)/RTK_Surveyor_Partitions_16MB.bin \
+         0xe000   $(BOOT_LOADER_PATH)/boot_app0.bin \
+        0x10000   $<
+	$(TERMINAL_APP) -D $(TERMINAL_PORT) $(TERMINAL_PARAMS)
+
+TERMINAL_PORT_2=/dev/ttyUSB1
+
+.PHONY: upload2
+
+upload2:	build/esp32.esp32.esp32/$(EXAMPLE_SKETCH).ino.bin
+	python3 $(ESPTOOL_PATH)/esptool.py \
+        --chip   esp32 \
+        --port   $(TERMINAL_PORT_2) \
+        --baud   $(UPLOAD_SPEED) \
+        --before   default_reset \
+        --after   hard_reset \
+        write_flash \
+        --flash_mode dio \
+        --flash_freq 80m \
+        --flash_size detect \
+        --compress \
+         0x1000   $(BOOT_LOADER_PATH)/RTK_Surveyor.ino.bootloader.bin \
+         0x8000   $(BOOT_LOADER_PATH)/RTK_Surveyor_Partitions_16MB.bin \
+         0xe000   $(BOOT_LOADER_PATH)/boot_app0.bin \
+        0x10000   $<
+	$(TERMINAL_APP) -D $(TERMINAL_PORT_2) $(TERMINAL_PARAMS)
+
+##########
+# Terminal
+##########
+
+.PHONY: terminal
+
+terminal:
+	$(TERMINAL_APP) -D $(TERMINAL_PORT) $(TERMINAL_PARAMS)
+
+.PHONY: terminal2
+
+terminal2:
+	$(TERMINAL_APP) -D $(TERMINAL_PORT_2) $(TERMINAL_PARAMS)
+
+##########
+# Clean up the example
+##########
+
+clean:
+	$(DELETE) build