Many thanks for the advice.
It seems that the MRK1000 is scanning the broadcast addresses of the subnets for a period of time, then it increments the first octet of the IP address.
It is the only thing in the subnet. I’m a Network Security bod by trade, and can confirm that there is only one node in that subnet, the MKR1000, only it’s MAC address appears in the firewall arp table, (for that interface).
As well as, packet captures have all this detail in their headers, when I look at the SYN packets heading out.
currently it’s sending SYN’s to 197.255.255.255, 198.255.255.255, 200,255.255.255
Not too sure why it skipped 199.255.255.255
I’m 100% sure that this has nothing to do with ThingSpeak.
I’m stating to suspect that the issue is in the underlying code, or it’s been exposed to something that has corrupted it. I’m guessing that there is malware in the wild for these?
As for the code that this device is running:-
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>
#include <WiFi101.h>
#define BMP_SCK 13
#define BMP_MISO 12
#define BMP_MOSI 11
#define BMP_CS 10
//Hardware pin definitions
int UVOUT = A0; //Output from the sensor
int REF_3V3 = A1; //3.3V power on the Arduino board
// Used for BMP2800
Adafruit_BMP280 bme; // I2C
int BMP280T1 = 0;
int BMP280P1 = 0;
// Local Network Settings
char ssid = “OOO”;
char pass = “********”;
int status = WL_IDLE_STATUS;
// Initialize the Wifi client library
WiFiClient client;
// ThingSpeak Settings
char server = “api.thingspeak.com”;
String writeAPIKey = “********************”; // Exeter Street
unsigned long lastConnectionTime = 0; // track the last connection time
const unsigned long postingInterval = 30L * 1000L; // post data every 30 seconds
// declare Voids
void ReadUV();
void setup() {
Serial.begin(9600);
Serial.println(“BMP280 Villetta Sensor-01”);
Serial.println(“v0.1 - 20160602”);
if (!bme.begin()) {
Serial.println(“Could not find a valid BMP280 sensor, check wiring!”);
while (1);
}
// Setup for UV sensor
pinMode(UVOUT, INPUT);
pinMode(REF_3V3, INPUT);
// attempt to connect to Wifi network:
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network:
status = WiFi.begin(ssid, pass);
// wait 10 seconds for connection:
delay(10000);
}
// you’re connected now, so print out the data:
Serial.println(“You’re connected to the network”);
// printCurrentNet();
// printWifiData();
}
void loop() {
// if interval time has passed since the last connection,
// then connect again and send data
if (millis() - lastConnectionTime > postingInterval) {
// ReadSensors();
ReadUV();
httpRequest();
}
}
void httpRequest() {
Serial.println(“Collecting Data to send”);
// read analog pin 0
int sensorValue = analogRead(0);
// read Wi-Fi signal strength (rssi)
long rssi = WiFi.RSSI();
// read temperature
String BMP280T1 = String(bme.readTemperature());
// read pressure
String BMP280P1 = String(bme.readPressure() / 100.0F);
// read UV
// int uvLevel = averageAnalogRead(UVOUT);
// int refLevel = averageAnalogRead(REF_3V3);
//Use the 3.3V power pin as a reference to get a very accurate output value from sensor
// float outputVoltage = 3.3 / refLevel * uvLevel;
// float uvIntensity = mapfloat(outputVoltage, 0.99, 2.9, 0.0, 15.0);
Serial.print("MP8511 output: ");
Serial.print(uvLevel);
Serial.print(" MP8511 voltage: ");
Serial.print(outputVoltage);
Serial.print(" UV Intensity (mW/cm^2): ");
Serial.println(uvIntensity);
// show the values to the serial port - more for debug than anything else
Serial.println(“Data to be sent to ThingSpeak:-”);
Serial.println(rssi);
Serial.println(BMP280T1);
Serial.println(BMP280P1);
Serial.println(uvLevel);
Serial.println(uvIntensity);
Serial.println(“Sending data to ThingSpeak”);
// create data string to send to ThingSpeak
// String data = String(“field1=” + String(rssi, DEC) + “&field2=” + String(rssi, DEC));
String data = String(“field1=” + String(rssi, DEC) + “&field2=” + (BMP280T1) + “&field3=” + (BMP280P1) + “&field4=” + (uvLevel) + “&field5=” + (uvIntensity));
// close any connection before sending a new request
client.stop();
// POST data to ThingSpeak
if (client.connect(server, 80)) {
client.println(“POST /update HTTP/1.1”);
client.println(“Host: api.thingspeak.com”);
client.println(“Connection: close”);
client.println(“User-Agent: ArduinoWiFi/1.1”);
client.println("X-THINGSPEAKAPIKEY: "+writeAPIKey);
client.println(“Content-Type: application/x-www-form-urlencoded”);
client.print(“Content-Length: “);
client.print(data.length());
client.print(”\n\n”);
client.print(data);
// note the last connection time
lastConnectionTime = millis();
}
}
/*
void ReadSensors() {
Serial.println(“Reading BMP280”);
Serial.print(“Temperature = “);
Serial.print(bme.readTemperature());
// BMP280T1 = (bme.readTemperature());
String BMP280T1 = String(bme.readTemperature());
Serial.println(” *C”);
Serial.print(“Pressure = “);
Serial.print(bme.readPressure());
String BMP280P1 = String(bme.readPressure());
Serial.println(” Pa”);
Serial.println(“BMP280 Values”);
}
void ReadUV()
{
int uvLevel = averageAnalogRead(UVOUT);
int refLevel = averageAnalogRead(REF_3V3);
//Use the 3.3V power pin as a reference to get a very accurate output value from sensor
float outputVoltage = 3.3 / refLevel * uvLevel;
float uvIntensity = mapfloat(outputVoltage, 0.99, 2.9, 0.0, 15.0);
Serial.print("MP8511 output: ");
Serial.print(uvLevel);
Serial.print(" MP8511 voltage: ");
Serial.print(outputVoltage);
Serial.print(" UV Intensity (mW/cm^2): ");
Serial.print(uvIntensity);
Serial.println();
delay(100);
}
int averageAnalogRead(int pinToRead)
{
byte numberOfReadings = 8;
unsigned int runningValue = 0;
for(int x = 0 ; x < numberOfReadings ; x++)
runningValue += analogRead(pinToRead);
runningValue /= numberOfReadings;
return(runningValue);
}
float mapfloat(float x, float in_min, float in_max, float out_min, float out_max)
{
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
