ESP32 SendPhoto example - no photos sent

[henkbb36org]

I am trying the Echobot example in order to learn how to send photos from the ESP32-CAM using UniversalTelegramBot 1.3 and the latest Arduino IDE. After uploading the sketch it runs and I see response when sending the /start, /flash and /photo command using my bot. However, when sending the /photo command I see the response "Sending" and "Done!" in the serial monitor but I don't receive a photo. When I add a "Serial.println(fb->len);" to the sendImage function I can see there is data, so the photo capture function seems to work. Any ideas? I am trying this sketch: https://github.com/witnessmenow/Universal-Arduino-Telegram-Bot/tree/master/examples/ESP32/SendPhoto/ESP32-Cam/

[henkjannl]

Same here, I also tried the /ESP32/SendPhoto/PhotoFromSD/ example but I get the same result with an M5stack and SD card:

• SD Card is working fine
• File is found on the SD card
• Uploading the bytes takes a while
• Serial port reports success
• Text message before and after the photo is sent well, so channel is open

I tried the same thing with SPIFFS instead of SD with the same result. Tried small (<4kb) and large photo's, JPG and PNG, but no result. Help would be very much appreciated.

[henkbb36org]

Hi Henk Jan, I couldn't solve it and I have switched to using the AscynchTelegram library. It has a working example using a bot. With these two functions from the example I can send a photo using a file from SPIFFS that was captured as a screenshot:

bool checkPhoto( fs::FS &fs ) { File f_pic = fs.open( FILE_PHOTO ); unsigned int pic_sz = f_pic.size(); return ( pic_sz > 100 ); }

void capturePhotoSaveSpiffs( void ) { camera_fb_t * fb = NULL; // pointer bool ok = 0; // Boolean indicating if the picture has been taken correctly

SPIFFS.remove(FILE_PHOTO); do { // Take a photo with the camera Serial.println("Taking a photo...");

fb = esp_camera_fb_get();
if (!fb) {
  Serial.println("Camera capture failed");
  return;
}
// Photo file name
Serial.printf("Picture file name: %s\n", FILE_PHOTO);
File file = SPIFFS.open(FILE_PHOTO, FILE_WRITE);

// Insert the data in the photo file
if (!file) {
  Serial.println("Failed to open file in writing mode");
}
else {
  file.write(fb->buf, fb->len); // payload (image), payload length
  Serial.print("The picture has been saved in ");
  Serial.print(FILE_PHOTO);
  Serial.print(" - Size: ");
  Serial.print(file.size());
  Serial.println(" bytes");
}
// Close the file
file.close();
esp_camera_fb_return(fb);

// check if file has been correctly saved in SPIFFS
ok = checkPhoto(SPIFFS);

} while ( !ok ); }

[henkjannl]

Wow thanks very much, I want to be able to send logfiles from my room thermostat to my computer over Telegram and I was kind of stuck since non of the examples worked. Thanks for the hint I will certainly check out this library.

[maxpicklez]

I had similar issues using an ESP32-cam AITHINKER with the Universal Telegram Bot from within Arduino Studio. I downloaded the latest master and it still didn't work. I realized that I was missing :

client.setCACert(TELEGRAM_CERTIFICATE_ROOT);

after my WiFi.Begin(SSID, WPA2);

After adding that line everything worked like a charm for me. I love this library. :+1:

[Stepyon]

I have the same issue, photo just doesn't arrive with any settings I tried to modify, nothing helped, text messages arrive without problem, images don't.