JsonUdpBeacon.ino

#include <ArduinoJson.h>
#include <Ethernet.h>
#include <SPI.h>

byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress remoteIp(192, 168, 0, 108);  // <- EDIT!!!!
unsigned short remotePort = 8888;
unsigned short localPort = 8888;
EthernetUDP udp;

void setup() {
  // Initialize serial port
  Serial.begin(9600);
  while (!Serial) continue;

  // Initialize Ethernet libary
  if (!Ethernet.begin(mac)) {
    Serial.println(F("Failed to initialize Ethernet library"));
    return;
  }

  // Enable UDP
  udp.begin(localPort);
}

void loop() {
  // Allocate a temporary JsonDocument
  // Use arduinojson.org/v6/assistant to compute the capacity.
  StaticJsonDocument<500> doc;

  // Create the "analog" array
  JsonArray analogValues = doc.createNestedArray("analog");
  for (int pin = 0; pin < 6; pin++) {
    // Read the analog input
    int value = analogRead(pin);

    // Add the value at the end of the array
    analogValues.add(value);
  }

  // Create the "digital" array
  JsonArray digitalValues = doc.createNestedArray("digital");
  for (int pin = 0; pin < 14; pin++) {
    // Read the digital input
    int value = digitalRead(pin);

    // Add the value at the end of the array
    digitalValues.add(value);
  }

  // Log
  Serial.print(F("Sending to "));
  Serial.print(remoteIp);
  Serial.print(F(" on port "));
  Serial.println(remotePort);
  serializeJson(doc, Serial);

  // Send UDP packet
  udp.beginPacket(remoteIp, remotePort);
  serializeJson(doc, udp);
  udp.println();
  udp.endPacket();

  // Wait
  delay(10000);
}