Remotely Updating Arduino mega Sketch using enc28j60 ethernet Module

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1

Hello,

I'am still new to arduino and i am currently working on a project that is gonna be included in my thesis. I am using an Arduino Mega 2560 hooked to an enc28j60 ethernet Module. It send every 5 mins a json file to the cloud. The project will be shipped to another country and i am asking if there is a way to update the arduino sketch using ethernet connection. There is no SD card slot , so basically an arduino mega hooked to an enc28j60. Is there a way to update the sketch or this is impossible.

Thanks.

2

yes

3

I have put the .bin file on the cloud but I always get status Code -1, I think the sketch doesn't find the file somehow

4

it is an example. modify it as you need. it looks for a bin file named update-v1.bin in the doc root of the webserver

5

I have modified it and I have put the path of the bin file yet I only got statusCode -1. I tried to print the body of the response but I got an empty line. Somehow using postman I tried testing the Get Method and I got the bin file back but I don't know why on the Arduino IDE it Stops at that point

6

the code doesn't run in Arduino IDE. it runs on the Arduino.

maybe show here your test sketch

7

this is the sketch that i am using:
#include <EthernetENC.h>
#include <ArduinoOTA.h> // only for InternalStorage
#include <Ethernet.h>
#include <ArduinoHttpClient.h>
#include <EthernetClientSecure.h>

const short VERSION = 1;

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

#ifdef ARDUINO_SAM_ZERO // M0
#define Serial SerialUSB
#endif

const char* SERVER = "212.24.108.195"; // must be string for HttpClient
const unsigned short SERVER_PORT = 5001;
const char* URL = "https://2ii5.l.time4vps.cloud/webUI/update.bin"; // fixed URL for update file
const unsigned long CHECK_INTERVAL = 5000;

static unsigned long previousMillis;

void handleSketchDownload() {
unsigned long currentMillis = millis();

if (currentMillis - previousMillis < CHECK_INTERVAL)
return;
previousMillis = currentMillis;

EthernetClientSecure transport;
transport.setInsecure();

HttpClient client(transport, SERVER, SERVER_PORT);

Serial.print("Check for update file ");
Serial.println(URL);

client.get(URL);
Serial.println(client.get(URL));
Serial.println(client.responseBody());

int statusCode = client.responseStatusCode();
Serial.print("Update status code: ");
Serial.println(statusCode);
if (statusCode != 200) {
client.stop();
return;
}

long length = client.contentLength();
if (length == HttpClient::kNoContentLengthHeader) {
client.stop();
Serial.println("Server didn't provide Content-length header. Can't continue with update.");
return;
}
Serial.print("Server returned update file of size ");
Serial.print(length);
Serial.println(" bytes");

if (!InternalStorage.open(length)) {
client.stop();
Serial.println("There is not enough space to store the update. Can't continue with update.");
return;
}
byte b;
while (length > 0) {
if (!client.readBytes(&b, 1)) // reading a byte with timeout
break;
InternalStorage.write(b);
length--;
}
InternalStorage.close();
client.stop();
if (length > 0) {
Serial.print("Timeout downloading update file at ");
Serial.print(length);
Serial.println(" bytes. Can't continue with update.");
return;
}

Serial.println("Sketch update apply and reset.");
Serial.flush();
InternalStorage.apply(); // this doesn't return
}

void setup() {

Serial.begin(115200);
while (!Serial);

Serial.print("Sketch version ");
Serial.println(VERSION);

Serial.println("Initialize Ethernet with DHCP:");
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
while (true);
}
Serial.println("Ethernet connected");
}

void loop() {
// check for updates
handleSketchDownload();

// add your normal loop code below ...
}

8

ArduinoHttpClient doesn't take a whole URL. server and port are provided in begin.

https doesn't work with Ethernet or EthernetENC

9

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