Exposing the IP and MAC address of a Spark Core using Spark.variable()

ip_and_mac_vars.ino

char ipString[16];
char macString[18];

void setup() {
  Spark.variable("ip", ipString, STRING);
  Spark.variable("mac", macString, STRING);

  byte mac[6];
  Network.macAddress(mac);
  sniprintf(macString, 18, "%02x:%02x:%02x:%02x:%02x:%02x",
      mac[5], mac[4], mac[3], mac[2], mac[1], mac[0]);
}

void loop() {
  IPAddress ip = Network.localIP();
  sniprintf(ipString, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
}