How to send Large data in POST in Tiva C Series

Bhavesh Patel

Hi,

I am using CCS v6.1.0.00104 and TivaWare_C_Series-2.1.1.71 on EK-TM4C1294XL on Windiws 8 64 bit.

Currently I am doing POST Request to local server with I2C sensor data taken from Launchpad. I have taken enet_weather example as base and checking the limit how much data can be sent in one POST Command.

I inecrease MAX_LENGTH to 16KBytes. I observed that when Payload in gs_Enet.pcRequest is going more than 8192 bytes it is not able to send data.

I increased TCP_WND to 16K, TCP_MSS to 4096 and TCP_SND_BUF as (4 * TCP_MSS), but than tcp_write() in starts giving error as -1(ERR_MEM). I even tried to increase parameter size more and it started giving compilation error because of Low memory.

Can you please let me know how to resolve this? My server is not allowing TCP Socket Connection. So Socket APIs are not helping. Attached is lwipopts.h file. LwIP version is 1.4.1

Thanks,
Bhavesh

lwipopts.h

over 9 years ago

0 Amit Ashara over 9 years ago

TI__Guru**** 244400 points

Hello Bhavesh

The Transmit buffer size in the EMAC controller has a maximum value of 8KB. That is why it is not allowing large transfer size.

Regards
Amit

0 Bhavesh Patel over 9 years ago in reply to Amit Ashara

Expert 1435 points

Hi Ashish,

Is there a way we can increase limit from 8K to 32K? Because for 8K adding Network latency to send Payload, it is taking around 6 sec. If I have to send large payload (requirement is to send 100K at every 1 min), it will be a cumbersome task and will not be able to send that much data.

Thanks,
Bhavesh

0 Amit Ashara over 9 years ago in reply to Bhavesh Patel

TI__Guru**** 244400 points

Hello Bhavesh.

None, that I have used and am aware of. If other forum members have done so, then you ma have to wait for such information.

Regards
Amit

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How to send Large data in POST in Tiva C Series