Large POST request on ESP32 over SIM

Hey, bit of a pot shot putting it in here but anyways

My Microcontroller is an esp32-cam, and I am trying to currently write a function to send a POST request containing form data to my server.

I am using TinyGSM with a SIM7600 module.

so currently the jpegs being captured take up 100kb in RAM
this is 1/3 of the RAM, but thats fine.

The issue is sending this to the SIM module.
can only send 1kb over serial, so i have to chunk it into smaller sizes when sending it
i.e

        String head = "--PotWatcher\r\nContent-Disposition: form-data; name=\"image\"; filename=\"PotWatcherImage.jpg\"\r\nContent-Type: image/jpeg\r\n\r\n";
        String tail = "\r\n--PotWatcher--\r\n";
        // Make a HTTP GET request:
        Serial.println("Performing HTTP POST request...");
        client.print(String("POST ") + resource + " HTTP/1.1\r\n");
        client.print(String("Host: ") + host + "\r\n");
        client.print(String("Authorization: ") + uuid + "\r\n");
        client.println("Connection: Keep-Alive");
        client.println("Content-Length: " + String(length));
        client.println("Content-Type: multipart/form-data;boundary=PotWatcher");
        client.println();
        client.print(head);

        uint8_t *fbBuf = payload;
        for (size_t n = 0; n < length; n = n + PACKET_SIZE)
        {
            if (n + PACKET_SIZE < length)
            {
                client.write(fbBuf, PACKET_SIZE);
                fbBuf += PACKET_SIZE;
            }
            else if (length % PACKET_SIZE > 0)
            {
                size_t remainder = length % PACKET_SIZE;
                client.write(fbBuf, remainder);
            }
        }

        client.print(tail);

        String head = "--PotWatcher\r\nContent-Disposition: form-data; name=\"image\"; filename=\"PotWatcherImage.jpg\"\r\nContent-Type: image/jpeg\r\n\r\n";
        String tail = "\r\n--PotWatcher--\r\n";
        // Make a HTTP GET request:
        Serial.println("Performing HTTP POST request...");
        client.print(String("POST ") + resource + " HTTP/1.1\r\n");
        client.print(String("Host: ") + host + "\r\n");
        client.print(String("Authorization: ") + uuid + "\r\n");
        client.println("Connection: Keep-Alive");
        client.println("Content-Length: " + String(length));
        client.println("Content-Type: multipart/form-data;boundary=PotWatcher");
        client.println();
        client.print(head);

        uint8_t *fbBuf = payload;
        for (size_t n = 0; n < length; n = n + PACKET_SIZE)
        {
            if (n + PACKET_SIZE < length)
            {
                client.write(fbBuf, PACKET_SIZE);
                fbBuf += PACKET_SIZE;
            }
            else if (length % PACKET_SIZE > 0)
            {
                size_t remainder = length % PACKET_SIZE;
                client.write(fbBuf, remainder);
            }
        }

        client.print(tail);

        String head = "--PotWatcher\r\nContent-Disposition: form-data; name=\"image\"; filename=\"PotWatcherImage.jpg\"\r\nContent-Type: image/jpeg\r\n\r\n";
        String tail = "\r\n--PotWatcher--\r\n";
        // Make a HTTP GET request:
        Serial.println("Performing HTTP POST request...");
        client.print(String("POST ") + resource + " HTTP/1.1\r\n");
        client.print(String("Host: ") + host + "\r\n");
        client.print(String("Authorization: ") + uuid + "\r\n");
        client.println("Connection: Keep-Alive");
        client.println("Content-Length: " + String(length));
        client.println("Content-Type: multipart/form-data;boundary=PotWatcher");
        client.println();
        client.print(head);

        uint8_t *fbBuf = payload;
        for (size_t n = 0; n < length; n = n + PACKET_SIZE)
        {
            if (n + PACKET_SIZE < length)
            {
                client.write(fbBuf, PACKET_SIZE);
                fbBuf += PACKET_SIZE;
            }
            else if (length % PACKET_SIZE > 0)
            {
                size_t remainder = length % PACKET_SIZE;
                client.write(fbBuf, remainder);
            }
        }

        client.print(tail);

        String head = "--PotWatcher\r\nContent-Disposition: form-data; name=\"image\"; filename=\"PotWatcherImage.jpg\"\r\nContent-Type: image/jpeg\r\n\r\n";
        String tail = "\r\n--PotWatcher--\r\n";
        // Make a HTTP GET request:
        Serial.println("Performing HTTP POST request...");
        client.print(String("POST ") + resource + " HTTP/1.1\r\n");
        client.print(String("Host: ") + host + "\r\n");
        client.print(String("Authorization: ") + uuid + "\r\n");
        client.println("Connection: Keep-Alive");
        client.println("Content-Length: " + String(length));
        client.println("Content-Type: multipart/form-data;boundary=PotWatcher");
        client.println();
        client.print(head);

        uint8_t *fbBuf = payload;
        for (size_t n = 0; n < length; n = n + PACKET_SIZE)
        {
            if (n + PACKET_SIZE < length)
            {
                client.write(fbBuf, PACKET_SIZE);
                fbBuf += PACKET_SIZE;
            }
            else if (length % PACKET_SIZE > 0)
            {
                size_t remainder = length % PACKET_SIZE;
                client.write(fbBuf, remainder);
            }
        }

        client.print(tail);

the issue with this is that if one of the

.write()

.write()

.write()

.write()'s fails (which usually 1 does) i have no way of knowing until i get either a response from the server, or a timeout.

An example of this would be

https://cdn.discordapp.com/attachments/244238376167800832/1043504972156915792/image.png

at this stage i am unsure on what to do.

I can safely send post requests that contain little to no data (i.e for one of them i send the GPS lat and long and that works fine)

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Large POST request on ESP32 over SIM

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