code.ino

String json = String("{\"count\":" + String(count) + "}");

int stringLength;
if (count < 10) {
  stringLength = 13;
} else if (count < 100) {
  stringLength = 14;
} else if (count < 1000) {
  stringLength = 15;
} else {
  stringLength = 16;
}

char input[stringLength];
json.toCharArray(input, stringLength);
int inputLen = sizeof(input);
int encodedLen = base64_enc_len(inputLen);

char encoded[encodedLen];
base64_encode(encoded, input, inputLen); 

String encodedString = String(encoded);
if (count < 10) {
  String morphed = encodedString.substring(0, encodedString.length() - 5) + String("=");
  Particle.publish("magnetPass", morphed);
} else if (count < 100) {
  String morphed = encodedString.substring(0, encodedString.length() - 4);
  Particle.publish("magnetPass", morphed);
} else if (count < 1000) {
  String morphed = encodedString.substring(0, encodedString.length() - 2) + String("==");
  Particle.publish("magnetPass", morphed);
} else {
  String morphed = encodedString.substring(0, encodedString.length() - 5) + String("=");
  Particle.publish("magnetPass", morphed);
}