Re: [lwip-users] lwip hangs after >12 hours of work

[Patrick Klos]

I know it's a long shot, but I'm gonna go off on a tangent and ask how your system does elapsed timing?

Bottom line: check that your timers aren't rolling over.  If you happen to have a 100 kHz clock and use it to time things with 32 bit unsigned integers, it'll roll over in about 12 hours (well, 11.93 hours to be more precise).  I've seen such odd timing related issues several times in the last few months, so I thought I'd mention it.

If that doesn't shed any light, a few follow up questions:

1. Is it always the same exact amount of time (give or take a little)?? (if yes, answer #2)
   
2. If you start the system, but don't start the connection for 30 minutes, does the system stop after the amount of time the system was up or the amount of time that the connection was up?
3. How many characters have been transmitted and received during that timeframe?
   

Good luck hunting!

Patrick Klos
Klos Technologies, Inc.

On 3/25/2020 7:06 PM, Artem Moroz wrote:

Hi, All!

I have STM32F7 board with lwip 2.0.3 running PPOS connection with SIMCOM
modem. I am attaching my lwipopts.h file.  lwipopts.h
<http://lwip.100.n7.nabble.com/file/t2270/lwipopts.h>   After some (long)
period of  time when modem fails to transmit data, the PPOS connection seems
to be "hung". It does nothing. No retries. I've tried to simulate the
behavior by dropping connection on counter variable, but it does restore. 

I have the following output function which shows error "MDM tx timeout end"
and then "MDM tx send failed" two times and then gets not invoked. 

static u32_t ppp1_output_cb(ppp_pcb *pcb, u8_t *data, u32_t len, void *ctx)
{
	//printf("ppp1_o len %d begin\n", len);
	osEvent evt={0};
	do
	{
		evt = osMessageGet(msgLwipTxUartHandle, 0);

	} while(evt.status == osEventMessage);

	if (!g_bModemNetworkInited)
	{
		printf("MDM tx not inited end\r\n");
		return len;
	}

	if (g_bModemSendFailed)
	{
		printf("MDM tx send failed\r\n");
		return len;
	}

	osSemaphoreWait(semModemHandle, osWaitForever);
	HAL_UART_Transmit_DMA(g_pUartModem, data, len);
	osSemaphoreRelease(semModemHandle);

//	static int nSent = 0;
//
//	if (nSent < 200)
//	{
//	nSent++;
	evt = osMessageGet(msgLwipTxUartHandle, 500);
	if (evt.status == osEventMessage)
	{
		//printf("MDM tx len %lu\n", len);
		return len;
	}
//	}
//	else
//	{
//		osDelay(500);
//
//	}

	g_bModemSendFailed = 1;
	printf("MDM tx timeout end\r\n");
	//pppapi_close(pcb, 1);

	return len;
}

What may be the problem? How can I trace it down?





--
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