Add ESP-NOW Arduino library

CMakeLists.txt

@@ -83,6 +83,7 @@ set(ARDUINO_ALL_LIBRARIES
   DNSServer
   EEPROM
   ESP_I2S
+  ESP_NOW
   ESP_SR
   ESPmDNS
   Ethernet
@@ -126,6 +127,10 @@ set(ARDUINO_LIBRARY_DNSServer_SRCS libraries/DNSServer/src/DNSServer.cpp)
 set(ARDUINO_LIBRARY_EEPROM_SRCS libraries/EEPROM/src/EEPROM.cpp)
 
 set(ARDUINO_LIBRARY_ESP_I2S_SRCS libraries/ESP_I2S/src/ESP_I2S.cpp)
+
+set(ARDUINO_LIBRARY_ESP_NOW_SRCS 
+  libraries/ESP_NOW/src/ESP32_NOW.cpp
+  libraries/ESP_NOW/src/ESP32_NOW_Serial.cpp)
 
 set(ARDUINO_LIBRARY_ESP_SR_SRCS 
   libraries/ESP_SR/src/ESP_SR.cpp

libraries/ESP_NOW/examples/ESP_NOW_Serial/ESP_NOW_Serial.ino

@@ -0,0 +1,107 @@
+/*
+    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.
+    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"
+
+// 0: AP mode, 1: Station mode
+#define ESPNOW_WIFI_MODE_STATION 0
+
+// Channel to be used by the ESP-NOW protocol from 1 to 13
+#define ESPNOW_WIFI_CHANNEL 1
+
+#if ESPNOW_WIFI_MODE_STATION // ESP-NOW using WiFi Station mode
+#define ESPNOW_WIFI_IF   WIFI_IF_STA
+#define GET_IF_MAC       WiFi.macAddress
+
+// Station mode MAC addresses of the devices in the network
+// Device 1 - F4:12:FA:42:B6:E8
+const MacAddress mac1({0xF4, 0x12, 0xFA, 0x42, 0xB6, 0xE8});
+// Device 2 - F4:12:FA:40:64:4C
+const MacAddress mac2({0xF4, 0x12, 0xFA, 0x40, 0x64, 0x4C});
+#else // ESP-NOW using WiFi AP mode
+#define ESPNOW_WIFI_IF   WIFI_IF_AP
+#define GET_IF_MAC       WiFi.softAPmacAddress
+
+// AP mode MAC addresses of the devices in the network
+// Device 1 - F6:12:FA:42:B6:E8
+const MacAddress mac1({0xF6, 0x12, 0xFA, 0x42, 0xB6, 0xE8});
+// Device 2 - F6:12:FA:40:64:4C
+const MacAddress mac2({0xF6, 0x12, 0xFA, 0x40, 0x64, 0x4C});
+#endif
+
+ESP_NOW_Serial_Class *esp_now_serial;
+
+void setup() {
+    MacAddress current_mac;
+
+    Serial.begin(115200);
+
+    Serial.print("WiFi Mode: ");
+
+    #if ESPNOW_WIFI_MODE_STATION
+    Serial.println("STA");
+    WiFi.mode(ESPNOW_WIFI_MODE);
+    esp_wifi_set_channel(ESPNOW_WIFI_CHANNEL, WIFI_SECOND_CHAN_NONE);
+    #else
+    Serial.println("AP");
+    WiFi.softAP(WiFi.getHostname(), NULL, ESPNOW_WIFI_CHANNEL, 1);
+    #endif
+
+    Serial.print("Channel: ");
+    Serial.println(ESPNOW_WIFI_CHANNEL);
+
+    String mac = GET_IF_MAC();
+    Serial.print("MAC Address: ");
+    current_mac.fromString(mac);
+    Serial.println(mac);
+
+    WiFi.disconnect();
+
+    if (current_mac == mac1)
+    {
+        Serial.println("I'm the Device 1\n");
+        // Pass the MAC address of the other device to the ESP_NOW_Serial_Class
+        esp_now_serial = new ESP_NOW_Serial_Class(mac2, ESPNOW_WIFI_CHANNEL, ESPNOW_WIFI_IF);
+    }
+    else if (current_mac == mac2)
+    {
+        Serial.println("I'm the Device 2\n");
+        // Pass the MAC address of the other device to the ESP_NOW_Serial_Class
+        esp_now_serial = new ESP_NOW_Serial_Class(mac1, ESPNOW_WIFI_CHANNEL, ESPNOW_WIFI_IF);
+    }
+    else
+    {
+        Serial.println("Unknown MAC address. Please update the mac addresses in the sketch\n");
+        while(1);
+    }
+
+    // Start the ESP-NOW communication
+    Serial.println("ESP-NOW communication starting...");
+    esp_now_serial->begin(115200);
+    Serial.println("You can now send data between the devices using the Serial Monitor\n");
+}
+
+void loop() {
+    while (esp_now_serial->available() > 0)
+    {
+        Serial.write(esp_now_serial->read());
+    }
+
+    while (Serial.available() && esp_now_serial->availableForWrite())
+    {
+        if (esp_now_serial->write(Serial.read()) <= 0)
+        {
+            Serial.println("Failed to send data");
+            break;
+        }
+    }
+
+    delay(1);
+}

libraries/ESP_NOW/library.properties

@@ -0,0 +1,9 @@
+name=ESP_NOW
+version=1.0.0
+author=me-no-dev
+maintainer=P-R-O-C-H-Y
+sentence=Library for ESP_NOW
+paragraph=Supports ESP32 Arduino platforms.
+category=Sensor
+url=https://github.com/espressif/arduino-esp32/
+architectures=esp32