I have many ESP32 devices distributed to my client but not easy to update the code manually. The best is to let let the Arduino to download(by instruction) the .bin file through http and update bythemself which is using OTA. Can any one give me code axample of
Thank you
Here are some links to tutorials that answer yours need.
Some Renzo Mischianti's tutorials.
"ESP32 self OTA update in HTTPS (SSL/TLS) with trusted self-signed certificate – 3" https://mischianti.org/esp32-self-ota-update-in-https-ssl-tls-with-trusted-self-signed-certificate-3/
"ESP32 firmware and filesystem update with FTP client – 2" https://mischianti.org/esp32-firmware-and-filesystem-update-with-ftp-client-2/
Another example could be the AutoConnect library for ESP8266/ESP32 In the section "OTA updates" -> "OTA using Update Server" https://hieromon.github.io/AutoConnect/otaupdate.html
And finally there are the Espressif Arduino-esp32 update library examples: https://github.com/espressif/arduino-esp32/tree/master/libraries/Update/examples
I have found the best answer here
#include <WiFi.h>
#include <HTTPClient.h>
#include <Update.h>
const char* ssid = "CGSB_2.4G";
const char* password = "xxx@";
const char* otaServer = "domain.com";
const char* otaFilePath = "/rnd/OTAWebUpdaterExampleCodeB.ino.bin";
const int BUTTON_PIN = 2;
void setup() {
Serial.begin(115200);
// Connect to Wi-Fi
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("Connected to WiFi");
pinMode(BUTTON_PIN, INPUT);
}
void loop() {
Serial.println("Waiting 5 seconds before starting OTA update...");
delay(5000); // Wait for 5 seconds
performOTAUpdate();
// Your main loop code here
}
void performOTAUpdate() {
Serial.println("Starting OTA update...");
// Construct the full URL for the firmware binary
String otaURL = String(otaServer) + otaFilePath;
// Begin HTTP client
HTTPClient http;
http.begin(otaURL);
// Start the update process
if (Update.begin(UPDATE_SIZE_UNKNOWN)) {
Serial.println("Downloading...");
// Start the download
int httpCode = http.GET();
if (httpCode == HTTP_CODE_OK) {
WiFiClient& stream = http.getStream();
uint8_t buffer[1024];
int bytesRead;
// Write the stream to the Update library in chunks
while ((bytesRead = stream.readBytes(buffer, sizeof(buffer))) > 0) {
if (Update.write(buffer, bytesRead) != bytesRead) {
Serial.println("Error during OTA update. Please try again.");
Update.end(false); // false parameter indicates a failed update
return;
}
}
// End the update process
if (Update.end(true)) {
Serial.println("OTA update complete. Rebooting...");
ESP.restart();
} else {
Serial.println("Error during OTA update. Please try again.");
Update.end(false); // false parameter indicates a failed update
}
} else {
Serial.println("Failed to download firmware.");
Update.end(false); // false parameter indicates a failed update
}
} else {
Serial.println("Failed to start OTA update.");
}
// End HTTP client
http.end();
}