photon_udp_test

// UDP Port used for two way communication
unsigned int localPort = 8888;

UDP udp;

const size_t maxPacketSize = 256;
uint8_t packetBuffer[maxPacketSize];
IPAddress ip(192,168,178,20); // ip of the computer running photontest.py

uint32_t last;
uint32_t count = 0;
const uint32_t interval = 20000;

void send_count(IPAddress& ip, int port){
  udp.beginPacket(ip, port);
  String countstr(count, DEC);
  countstr.getBytes(&packetBuffer[0], maxPacketSize);
  size_t count_length = countstr.length();
  packetBuffer[count_length] = ' ';
  udp.write(&packetBuffer[0], count_length+1);
  udp.endPacket();
}

void setup() {
    Serial.begin(9600);
    udp.begin(localPort);
    last = millis();
}

void loop() {
  auto now = millis();
  // not wrap around safe but that only happens every 50 days
  // and this is a simple hack
  if(now - last >= interval) {
    last = now;
    send_count(ip, 8888);
    count++;
  }

}