test.ino

String setJsonString(int counts) {
  String jsonS = "{\n";
  jsonS += "\"homeMobileCountryCode\": 234,\n"; // this is a real UK MCC
  jsonS += "\"homeMobileNetworkCode\": 27,\n";  // and a real UK MNC
  jsonS += "\"radioType\": \"gsm\",\n";         // for gsm
  jsonS += "\"carrier\": \"Vodafone\",\n";      // associated with Vodafone
  jsonS += "\"wifiAccessPoints\": [\n";
  for (int j = 0; j < counts; ++j)
  {
    jsonS += "{\n";
    jsonS += "\"macAddress\" : \"";
    jsonS += (WiFi.BSSIDstr(j));
    jsonS += "\",\n";
    jsonS += "\"signalStrength\": ";
    jsonS += WiFi.RSSI(j);
    jsonS += "\n";
    if (j < counts - 1)
    {
      jsonS += "},\n";
    }
    else
    {
      jsonS += "}\n";
    }
  }
  jsonS += ("]\n");
  jsonS += ("}\n");
  return jsonS;
}