SPWF01S Nagle

[mbuczek]

Posted on November 23, 2016 at 15:58

Hi,

how can I configure/deactivate the Nagle-Algorithm in SPWF01S?

Thanks!

MBU

[Gerardo GALLUCCI]

Posted on November 23, 2016 at 16:13

Hi Michael,

Nagle is enabled by default, and cannot be disabled.

jerry

[mbuczek]

Posted on November 23, 2016 at 16:35

Hi Jerry!

thanks for the quick response!

Is there any chance to transmit the desired amount of bytes, flush the buffer?

[Gerardo GALLUCCI]

Posted on November 23, 2016 at 17:15

It's not possible to explicitly flush the TCP output buffer, but AT+S.SOCKW algorithm takes care of ''more data'' flag:

- if there aren't more data to transfer, flush the buffer;

- if there are more data to transfer, wait and enqueue the buffer.

Threshold to flush/enqueue is around 730 bytes (1 MSS).

Example:

- SOCKW(500 bytes): send(500) + flush

- SOCKW(1000 bytes): send(730) + enqueue + send(270) + flush

Hope helps you

jerry

[mbuczek]

Posted on November 23, 2016 at 18:16

I use the socket server, when I'm connected, the wifi-module is in data-mode. I can not use the ''AT+S. SOCKW'' command...any other idea?

[Gerardo GALLUCCI]

Posted on November 23, 2016 at 18:32

Same behavior:

- buffer full: ''more data''

- buffer not full: flush

buffer size: 1024 - sizeof(escape_sequence)

note: use flowcontrol to avoid data loss

j