Hi.
I’ll send you an email.
Regards,
Sara

There is a little disadvantage of the email solution, it needs internet.
If we do not find an answer for my original question, then I will go for this email solution.
Thank you very much!
Peter
PS: Should I send you my whole sketch or publish it here in the comments?

Hi.
Can you be a little more specific?
Do you get any errors in the Serial Monitor?
Regards,
Sara

The code in this tutorial is working perfect as long the file on the sd card ist tiny. If the download takes too long, it is not working. Have googled several days now and found two proposals. One proposal is telling to increase the timeout, but it is not working for me.The second one is telling to set a flag and complete the download in the main loop. But I have not found a line of code which is doing that.

Proposal 1: These lines are in the setup:
server.on(“/d”, HTTP_GET, [](AsyncWebServerRequest *request) {
request->client()->setRxTimeout(60000);
request->send(SD, “/day1.csv”, “text/csv”);
});

Proposal 2: These lines are in the setup:

server.on(“/d”, HTTP_GET, [](AsyncWebServerRequest *request) {

downloadflag = 1;
});


But what should I write in the loop? A simple request->send is not working. The compile is saying: “Compilation error: ‘request’ was not declared in this scope”

void loop() {
if (downloadFlag == 1) {

request->send(SD, "/tag" + tag + ".csv", "text/csv");

});
downloadFlag = 0;


}

}

Any help is welcome and I am happy to send somethiing via paypal.

Sunny greetings from Freiburg, Black Forest, Germany
Peter

Hi.
That’s probably not the isssue.
You should have more information about the error, not just that warning.

Can you share more info?

Regards,

Sara

Compilation error: exit status 1

I´m sure that only one sd-card library is installed. What went wrong?

Desperately waiting for an answer
Andreas

// Reconnect microSD card
void connSDCard(){
if(!SD.exists(dataPath)){
Serial.println(“File not accessible”);
SD.begin();
Serial.println(“Reconnected SD card “);
}
return;
}

It no longer fails after a file view: but the delete still fails :

HTTP: Deleting data file Deleting file: /data.txt
– delete failed
Saving data: Wed 25/12/2024 09:09:47, 22.5, 47.2, 1018.8
Appending to file: /data.txt
File not accessible
Reconnected SD card
Failed to open file for appending
Saving data: Wed 25/12/2024 09:10:50, 22.5, 47.2, 1018.7
Appending to file: /data.txt
File not accessible
Reconnected SD card
Failed to open file for appending

The web page is now not displayed, but I can still ping the server.
On removing the sd card the delete has indeed failed.
At this point the server displays a blank page.
(now replaced the sd card)
Following a reset

Connecting to WiFi …..connected
192.168.1.57
SD Card Type: SDHC
SD Card Size: 3768MB
File already exists
Saving data: Wed 25/12/2024 03:33:19, 21.4, 50.8, 1016.7
Appending to file: /data.txt
Failed to open file for appending (web page not displayed)

Connecting to WiFi ……connected
192.168.1.57
SD Card Type: SDHC
SD Card Size: 3768MB
File already exists
Saving data: Wed 25/12/2024 03:34:41, 21.3, 50.9, 1016.7
Appending to file: /data.txt
Message appended (web page now displayed)

My best guess is that the error relates to access to the sd card.

Another issue is that the amount of data that is shown is limited.
Could it be that the data transfer is interrupted when a new reading is taken?