Streamlib.h crashes with 10Ko strings

[francissawt]

Hello everyone!

I have to send a long string (>10 000 char) through my ENC28J60 with ESP8266. Streamlib.h is a great library for sending streams (link). But here it is impossible due to calculation duration, the software WDT makes a reset.

I have already put a yield() inside :

size_t BufferedPrint::write(const uint8_t *buf, size_t length)
{ 
   yield(); 
   for (size_t...

Helped a lot but did not solved. Still crashing while writting.

How can it be improved?

Thanks in advance!

PS: my code is

const size_t BUFFER_SIZE = 128;
char html_buff[BUFFER_SIZE];
BufferedPrint message(client, html_buff, sizeof(html_buff));
message.print(F(HTML_STRING));

with HTML_STRING the 10Ko string.

[J-M-L]

are you a running a web server and need to serve a large page ? have you considered chunked transfer encoding?

[francissawt]

Replacing BufferedPrint by ChunkedPrint was indeed suffiscent.

Maybe I did not get what BufferedPrint print was doing, I thought it used a small buffer to send data, obviously that's what ChunkedPrint print is doing.

Thanks!

[Juraj]

ChunkedPrint extends BufferedPrint and changes the output to http chunked transfer encoding. size of the chunks is the size of the provided buffer.
I don't see how it helped.

do you use lwip_enc28j60 library?

[francissawt]

I am using EthernetENC.h. Do you think lwip_enc28j60 library could be more reliable?

In my further development I look forward HTTPS libraries, which require ESP32.

I took a look at the lwip libraries from khoih-prog. Hard to pick up the right one. I think this one should do the work, together with Streamlib to chunk streams.

[Juraj]

use lwip_enc28j60