M66 Gets stuck on SSL certi write

Technical Subjects
1

I am using OPEN CPU API RIL_QSSL_CERTIFICATE_WRITE_FILE() to write a certificate. however the problem i am facing is it randomly stucks the M66 though i have watchdog in place it wont reset until i do apower reset. Following is the implementation of the API.
s32 RIL_SSL_QSSLCERTIFICATE_WRITE(u8 timeout)
{
s32 ret = RIL_AT_SUCCESS;
s32 errCode = RIL_AT_FAILED;
char strAT[200];

 Ql_memset(strAT, 0, sizeof(strAT));
 write_flag= 1;
 Ql_sprintf(strAT, "AT+QSECWRITE=\"NVRAM:CA0\",%d,%d\n",CA_CERT_LEN,timeout);
 ret = Ql_RIL_SendATCmd(strAT,Ql_strlen(strAT),ATResponse_SSL_handler_CERTIFICATE_WRITE,&errCode,0);
 APP_DEBUG("<-- Send AT:%s, ret = %d -->\r\n",strAT, ret);
 if (ret != RIL_AT_SUCCESS)
 {
	if (RIL_AT_FAILED == errCode)
	{
		return ret;
	} 
	else 
	{
	   return errCode;
	}
 }

 Ql_memset(strAT, 0, sizeof(strAT));
 write_flag= 2;
 Ql_sprintf(strAT, "AT+QSECWRITE=\"NVRAM:CC0\",%d,%d\n",CL_CERT_LEN,timeout);
 ret = Ql_RIL_SendATCmd(strAT,Ql_strlen(strAT),ATResponse_SSL_handler_CERTIFICATE_WRITE,&errCode,0);
 APP_DEBUG("<-- Send AT:%s, ret = %d -->\r\n",strAT, ret);
 if (ret != RIL_AT_SUCCESS)
 {
	if (RIL_AT_FAILED == errCode)
	{
		return ret;
	} 
	else 
	{
	   return errCode;
	}
 }

 Ql_memset(strAT, 0, sizeof(strAT));
 write_flag= 3;
 Ql_sprintf(strAT, "AT+QSECWRITE=\"NVRAM:CK0\",%d,%d\n",CK_CERT_LEN,timeout);
 ret =Ql_RIL_SendATCmd(strAT,Ql_strlen(strAT),ATResponse_SSL_handler_CERTIFICATE_WRITE,&errCode,0);
 APP_DEBUG("<-- Send AT:%s, ret = %d -->\r\n",strAT, ret);
 if (ret != RIL_AT_SUCCESS)
 {
	if (RIL_AT_FAILED == errCode)
	{
		return ret;
	} 
	else 
	{
	   return errCode;
	}
 }
 return RIL_AT_SUCCESS;

}

static s32 ATResponse_SSL_handler_CERTIFICATE_WRITE(char* line, u32 len, void* userdata)
{
char* pHead = NULL;
pHead = Ql_RIL_FindString(line, len, “CONNECT”);
if (pHead)
{
Ql_Sleep(1000);//Do not move
Ql_RIL_WriteDataToCore((u8*)cert, Ql_strlen(cert));
if (write_flag == 1)
{
Ql_RIL_WriteDataToCore((u8*)CA_CERT, CA_CERT_LEN);
}
else if (write_flag == 2)
{
Ql_RIL_WriteDataToCore((u8*)CL_CERT, CL_CERT_LEN);
}
else if (write_flag == 3)
{
Ql_RIL_WriteDataToCore((u8*)CK_CERT, CK_CERT_LEN);
}
return RIL_ATRSP_CONTINUE; // wait for OK
}
pHead = Ql_RIL_FindString(line, len, “OK”);
if (pHead)
{
return RIL_ATRSP_SUCCESS;
}

pHead = Ql_RIL_FindString(line, len, "ERROR");
if (pHead)
{
	if (userdata != NULL)
	{
		*((s32*)userdata) = RIL_AT_FAILED;
	}
	return RIL_ATRSP_FAILED;
}
pHead = Ql_RIL_FindString(line, len, "+CME ERROR:");
if (pHead)
{
	if (userdata != NULL)
	{
		Ql_sscanf(line, "%*[^: ]: %d[^\r\n]", (s32*)userdata);
	}
	return RIL_ATRSP_FAILED;
}
return RIL_ATRSP_CONTINUE;	// Just wait for the specified results above

}

My observation is it never returns after sending ret=Ql_RIL_SendATCmd(strAT,Ql_strlen(strAT),ATResponse_SSL_handler_CERTIFICATE_WRITE,&errCode,0);
The reason i am suspecting this beacause APP_DEBUG("<-- Send AT:%s, ret = %d -->\r\n",strAT, ret); is never printed on QCOMM. Just before it stucks somewhere. Ideally watchdog should reset the module

2

Dear Heman

What is the SDK version you are using?

You are now the problem is the watchdog didn’t feed the dog but the module didn’t restart properly? Can you be sure that the dog is not fed in any other code?