GPRS Connection Problem

mcaglar · January 15, 2019, 10:39am

Hi all,

First of all, I must say that I am newbie on Open AT and embedded modules. Please accept my apologies if I ask stupid questions.

I am using Q2687H embedded modules and developing an application to connect remote server. I have some troubles with GPRS connection part of my code. All the settings are OK for APN and the other initial procedures (I think so ). When I download the app to the module to test if it works I got a problem. It gives me WIP_BEV_CONN_FAILED error first but when I remove and insert again the sim card it connects to GPRS.

You can see the related code snippets below:

Main:

void adl_main(adl_InitType_e InitType)
{
    switch (InitType)
    {
    case ADL_INIT_POWER_ON:
        break;

    case ADL_INIT_REBOOT_FROM_EXCEPTION:
        ATRSP("\r\nModem Start After Exception\r\n");
        break;

    case ADL_INIT_DOWNLOAD_SUCCESS:
        ATRSP("\r\nModem Start After DOTA OK\r\n");
        break;

    case ADL_INIT_DOWNLOAD_ERROR:
        ATRSP("\r\nModem Start After DOTA ERROR\r\n");
        break;

    case ADL_INIT_RTC:
        ATRSP("\r\nModem Start After RTC\r\n");
        break;
    }

	UART2_Enable();
	GPIO_Enable();
    adl_simSubscribe(Sim_Handler, (ascii *) SimPin);
}

Sim_Handler:

void Sim_Handler(u8 Event)
{
	switch (Event)
	{
	case ADL_SIM_EVENT_FULL_INIT:
		TRACE((1, "ADL_SIM_EVENT_FULL_INIT"));
		GPRS_Enable();
		break;
	case ADL_SIM_EVENT_PIN_WAIT:
		TRACE((1, "ADL_SIM_EVENT_PIN_WAIT"));
		break;
	case ADL_SIM_EVENT_PIN_OK:
		TRACE((1, "ADL_SIM_EVENT_PIN_OK"));
		break;
	case ADL_SIM_EVENT_INSERTED:
		TRACE((1, "ADL_SIM_EVENT_INSERTED"));
		break;
	case ADL_SIM_EVENT_REMOVED:
		TRACE((1, "ADL_SIM_EVENT_REMOVED"));
		break;
	case ADL_SIM_EVENT_PIN_ERROR:
		TRACE((1, "ADL_SIM_EVENT_PIN_ERROR"));
		break;
	case ADL_SIM_EVENT_PUK_WAIT:
		TRACE((1, "ADL_SIM_EVENT_PUK_WAIT"));
		break;
	case ADL_SIM_EVENT_PUK_ERROR:
		TRACE((1, "ADL_SIM_EVENT_PUK_ERROR"));
		break;
	case ADL_SIM_EVENT_FAILURE:
		TRACE((1, "ADL_SIM_EVENT_FAILURE"));
		break;
	case ADL_SIM_EVENT_NET_LOCK:
		TRACE((1, "ADL_SIM_EVENT_NET_LOCK"));
		break;
	case ADL_SIM_EVENT_LAST:
		TRACE((1, "ADL_SIM_EVENT_LAST"));
		break;
	default:
		TRACE((1, "default..."));
		break;
	}
}

GPRS_Enable:

void GPRS_Enable(void)
{
	TRACE (( 1, "GPRS_Enable" ));
    gprsIsValid = FALSE;
    gprsLed(FALSE);

    if (adl_gprsSubscribe(gprs_Handler) == OK)
    {
        s8RetVal = wip_bearerClose(gprs_bearer);
        s8RetVal = wip_netInit();

		if (s8RetVal < 0)
			TRACE((10, "ADL_SIM_EVENT_FULL_INIT : Bearer Close %d", s8RetVal));
		else
			TRACE((10, "ADL_SIM_EVENT_FULL_INIT : Bearer Closed"));

		s8RetVal = wip_bearerOpen(&gprs_bearer, "GPRS", gprsBearerHandler, NULL);

		if (s8RetVal < 0 && s8RetVal != -27)
			TRACE((10, "ADL_SIM_EVENT_FULL_INIT : Bearer Open %d", s8RetVal));
		else
			s8RetVal = wip_bearerSetOpts(gprs_bearer, WIP_BOPT_GPRS_CID,  1, WIP_BOPT_GPRS_APN, APN_Name,  WIP_BOPT_LOGIN,  APN_Username, WIP_BOPT_PASSWORD,  APN_Password,  WIP_BOPT_END);

		if (s8RetVal < 0)
			TRACE((10, "ADL_SIM_EVENT_FULL_INIT : Bearer SetOpts %d", s8RetVal));
		else
			s8RetVal = wip_bearerStart(gprs_bearer);

		if (s8RetVal < 0)
			TRACE((10, "ADL_SIM_EVENT_FULL_INIT : Bearer Start %d", s8RetVal));
		else
			TRACE((10, "ADL_SIM_EVENT_FULL_INIT : Bearer Started %d", s8RetVal));
		
		wm_sprintf(rsp, "status:%d\r\n", s8RetVal);
		ATRSP(rsp);
    }
    else
    {
        ATRSP("\r\nInit error\r\n");
        TRACE((1, "GPRS init error"));
    }
}

gprsBearerHandler:

void gprsBearerHandler(wip_bearer_t br, s8 event, void *ctx)
{
    ascii RspStr[128];
    ascii dns1Str[16], dns2Str[16];
    wip_in_addr_t ip, dns1, dns2;
    s8 errcode = 0;
    u8 gprsCID;

    if (br != gprs_bearer)
        return;

    switch (event)
    {
		case WIP_BEV_IP_CONNECTED:
			TRACE((10, "gprs_bearer: WIP_BEV_IP_CONNECTED"));
			//Get Bearer Info
			s8RetVal = wip_bearerGetOpts(br, WIP_BOPT_IP_ADDR, &ip, WIP_BOPT_IP_DNS1, &dns1, WIP_BOPT_IP_DNS2, &dns2, WIP_BOPT_END);

			if (s8RetVal < 0)
				TRACE((10, "WIP_BEV_IP_CONNECTED : GetOpts %d", s8RetVal));

			wip_inet_ntoa(ip, ipStr, sizeof(ipStr));
			wip_inet_ntoa(dns1, dns1Str, sizeof(dns1Str));
			wip_inet_ntoa(dns2, dns2Str, sizeof(dns2Str));
			wm_sprintf(RspStr, "\r\nGPRS: CONNECTED IP=%s DNS1=%s DNS2=%s\r\n",ipStr, dns1Str, dns2Str);
			gprsIsValid = TRUE;
			gprsLed(TRUE);
			TRACE((10, "WIP_BEV_IP_CONNECTED"));
			ATRSP(RspStr);
			break;

		case WIP_BEV_IP_DISCONNECTED:
			TRACE((10, "gprs_bearer: WIP_BEV_IP_DISCONNECTED"));
			gprsIsValid = FALSE;
			break;

		case WIP_BEV_STOPPED:
			TRACE((10, "gprs_bearer: WIP_BEV_STOPPED"));
			s8RetVal = wip_bearerClose(br);

			if (s8RetVal < 0)
				TRACE((12, "WIP_BEV_STOPPED : Stop %d", s8RetVal));

			gprsIsValid = FALSE;
			gprs_bearer = NULL;
			break;

		case WIP_BEV_CONN_FAILED:
			TRACE((10, "gprs_bearer: WIP_BEV_CONN_FAILED"));
			ATRSP("\r\n+WIPSTART: FAILED\r\n");
			s8RetVal = wip_bearerGetOpts(br, WIP_BOPT_GPRS_CID, &gprsCID, WIP_BOPT_ERROR, &errcode, WIP_BOPT_END);

			if (s8RetVal < 0)
				TRACE((10, "WIP_BEV_CONN_FAILED : GetOpts %d", s8RetVal));

			wm_sprintf(RspStr, "CID:%d\r\n", gprsCID);
			ATRSP(RspStr);
			wm_sprintf(RspStr, "Error Code:%d\r\n", errcode);
			ATRSP(RspStr);
			TRACE((10, "gprs_bearer: CID: %d Error Code: %d", gprsCID, errcode));
			wip_bearerClose(br);

			if (s8RetVal < 0)
				TRACE((10, "WIP_BEV_CONN_FAILED : Close %d", s8RetVal));

			gprsIsValid = FALSE;
			gprs_bearer = NULL;
			break;

		default:
			TRACE((10, "gprs_bearer: DEFAULT"));
			wm_sprintf(RspStr, "wip_bearer Code: %d\r\n", event);
			ATRSP(RspStr);
			break;
    }
}

Edit: I’ve added the Trace logs as following;

Timestamp	Id	Level	Message
2019/01/15;14:15:59:111 - 001	ADL	1	Binary header at 00260000
2019/01/15;14:15:59:111 - 002	ADL	1	Let’s Begin
2019/01/15;14:15:59:111 - 003	ADL	13	UART2 FCM Available
2019/01/15;14:15:59:127 - 001	ADL	13	FCM2 HANDLE RESULT: 0
2019/01/15;14:15:59:127 - 002	ADL	1	LED GPIO Subscribe OK
2019/01/15;14:15:59:127 - 003	ADL	1	GPIO OK
2019/01/15;14:15:59:127 - 004	ADL	1	ADL_SIM_EVENT_INSERTED
2019/01/15;14:15:59:127 - 005	ADL	13	UART2 is in DATA mode
2019/01/15;14:15:59:860 - 001	ADL	1	ADL_SIM_EVENT_PIN_OK
2019/01/15;14:16:04:291 - 001	ADL	1	ADL_SIM_EVENT_FULL_INIT
2019/01/15;14:16:04:291 - 002	ADL	1	GPRS_Enable
2019/01/15;14:16:04:291 - 003	ADL	10	ADL_SIM_EVENT_FULL_INIT : Bearer Closed
2019/01/15;14:16:04:291 - 004	ADL	10	ADL_SIM_EVENT_FULL_INIT : Bearer Start -27
2019/01/15;14:16:04:291 - 005	ADL	12	gprs_handler: Embedded : Event receive 25 CID: 1
2019/01/15;14:16:04:306 - 001	ADL	12	gprs_handler: ADL_GPRS_EVENT_SETUP_OK
2019/01/15;14:16:04:306 - 002	ADL	12	gprs_handler: Embedded : Event receive 25 CID: 1
2019/01/15;14:16:04:306 - 004	ADL	12	gprs_handler: Embedded : Event receive 23 CID: 1
2019/01/15;14:16:04:306 - 005	ADL	12	gprs_handler: ADL_GPRS_EVENT_ACTIVATE_KO : CID 1
2019/01/15;14:16:04:337 - 001	ADL	10	gprs_bearer: WIP_BEV_CONN_FAILED
2019/01/15;14:16:04:337 - 002	ADL	10	gprs_bearer: CID: 1 Error Code: -36
2019/01/15;14:16:18:268 - 001	ADL	1	ADL_SIM_EVENT_REMOVED
2019/01/15;14:16:19:750 - 001	ADL	1	ADL_SIM_EVENT_INSERTED
2019/01/15;14:16:20:655 - 001	ADL	1	ADL_SIM_EVENT_PIN_OK
2019/01/15;14:16:25:257 - 001	ADL	1	ADL_SIM_EVENT_FULL_INIT
2019/01/15;14:16:25:273 - 001	ADL	1	GPRS_Enable
2019/01/15;14:16:25:273 - 002	ADL	10	ADL_SIM_EVENT_FULL_INIT : Bearer Closed
2019/01/15;14:16:25:273 - 003	ADL	10	ADL_SIM_EVENT_FULL_INIT : Bearer Start -27
2019/01/15;14:16:25:273 - 004	ADL	12	gprs_handler: Embedded : Event receive 25 CID: 1
2019/01/15;14:16:25:273 - 005	ADL	12	gprs_handler: ADL_GPRS_EVENT_SETUP_OK
2019/01/15;14:16:25:288 - 001	ADL	12	gprs_handler: Embedded : Event receive 25 CID: 1
2019/01/15;14:16:25:288 - 002	ADL	12	gprs_handler: ADL_GPRS_EVENT_SETUP_OK
2019/01/15;14:16:26:255 - 001	ADL	12	gprs_handler: Embedded : Event receive 27 CID: 1
2019/01/15;14:16:26:255 - 002	ADL	12	gprs_handler: ADL_GPRS_EVENT_ME_ATTACH
2019/01/15;14:16:26:271 - 001	ADL	12	gprs_handler: Embedded : Event receive 27 CID: 1
2019/01/15;14:16:26:271 - 002	ADL	12	gprs_handler: ADL_GPRS_EVENT_ME_ATTACH
2019/01/15;14:16:27:737 - 001	ADL	12	gprs_handler: Embedded : Event receive 16 CID: 1
2019/01/15;14:16:27:737 - 002	ADL	12	gprs_handler: ADL_GPRS_EVENT_ANSWER_OK_FROM_EXT
2019/01/15;14:16:27:753 - 001	ADL	12	gprs_handler: Embedded : Event receive 16 CID: 1
2019/01/15;14:16:27:753 - 002	ADL	12	gprs_handler: ADL_GPRS_EVENT_ANSWER_OK_FROM_EXT
2019/01/15;14:16:27:769 - 001	ADL	12	gprs_handler: Embedded : Event receive 16 CID: 1
2019/01/15;14:16:27:769 - 002	ADL	12	gprs_handler: ADL_GPRS_EVENT_ANSWER_OK_FROM_EXT
2019/01/15;14:16:27:769 - 003	ADL	10	gprs_bearer: WIP_BEV_IP_CONNECTED
2019/01/15;14:16:27:769 - 004	ADL	10	WIP_BEV_IP_CONNECTED

Could anyone give me a suggestion about the problem?

Note: ATRSP is a simple function to send string to TMConsole.

Thanks in advance.

Best regards

MÇ.

jyijyi · January 15, 2019, 10:58am

Does this problem happen to sample application like tcp client?

mcaglar · January 15, 2019, 11:14am

Hi again @jyijyi

I didn’t try it yet. I will try and let you know.

By the way, is everything OK with my code?

Thanks.

MÇ.

jyijyi · January 15, 2019, 11:30am

Seems ok but better compare with sample code.

mcaglar · January 16, 2019, 7:46am

Hi @jyijyi,

I’ve tested a TCP Client Sample application and it worked. It seems the promblem is in my code

Best regards.

MÇ.

jyijyi · January 16, 2019, 7:59am

probably the root cause you didn´t check AT+CREG?..
seems you just wait for SIM full init, but there is a chance that it is not yet registered to the network.

mcaglar · January 16, 2019, 8:08am

Hi @jyijyi

Thanks for your reply.

So, you mean that I should check “AT+CREG?” and “ADL_SIM_EVENT_FULL_INIT” both together and then GPRS_Enable right?

Best regards.

MÇ.

jyijyi · January 16, 2019, 8:19am

correct.
I remember the TCP client sample code also did the same thing.

mcaglar · January 16, 2019, 8:32am

Hi @jyijyi

Thank you very much. I will try and post the result.

Best regards.

MÇ.

mcaglar · January 18, 2019, 2:33pm

Hi @jyijyi

I am sorry, I forgot to post the result

I’ve used the gprs sample codes and it worked. So I can connect to the GPRS network now. After that I’ve added some more code to SET and CLEAR the GPRS LED indicator on the device as following:

To define section:

#define GPIO_LED	2
adl_ioDefs_t GPRSLED_PORT = ADL_IO_GPIO | 2;
adl_ioDefs_t LedGpioConfig[GPIO_LED] = { ADL_IO_GPIO | 1 | ADL_IO_DIR_OUT | ADL_IO_LEV_LOW, ADL_IO_GPIO | 2 | ADL_IO_DIR_OUT | ADL_IO_LEV_LOW };
s32 LedGpioHandle;

The related functions:

void gprsLed(bool state)
{
	if (state)
		adl_ioWriteSingle(LedGpioHandle, &GPRSLED_PORT, TRUE);
	else
		adl_ioWriteSingle(LedGpioHandle, &GPRSLED_PORT, FALSE);
}

void GPIO_Enable(void)
{
	LedGpioHandle = adl_ioSubscribe(GPIO_LED, (adl_ioDefs_t *) LedGpioConfig, 0, 0, 0);
	if (LedGpioHandle > 0)
		TRACE((1, "LED GPIO Subscribe ==> OK"));
	else
		TRACE((1, "LED GPIO Subscribe FAILED --> %d", LedGpioHandle));
}

These codes working very well. I am turning on the LED when I got the “WIP_BEV_IP_CONNECTED” event and turning it off when I got the “ADL_GPRS_EVENT_ME_DETACH” or “ADL_GPRS_EVENT_ME_UNREG” events.

Then I wanted to use the GSM network time and write it to RTC time. I’ve write the following code

in Main:

//To subscribe to WIND 15 message
s16 s16RetVal =	adl_atUnSoSubscribe("+WIND: 15", (adl_atUnSoHandler_t) Wind15Handler);

and the WIND handler is:

bool Wind15Handler(adl_atUnsolicited_t *paras)
{
	TRACE((4, "-> (GSM Time) Enter."));

    adl_atUnSoUnSubscribe("+WIND: 15", (adl_atUnSoHandler_t) Wind15Handler);
    //TRACE((4, paras->StrData));
    wm_strGetParameterString(TimeUnmodified, paras->StrData, 7);
	TRACE((4, TimeUnmodified));
    adl_rtcTime_t  RTCTime;
    ascii atCmd[30];

    // YYYYMMDD HHMMSS
    RTCTime.Year = 2000 + wm_atoi(parseString(TimeUnmodified,0,2));
    RTCTime.Month = wm_atoi(parseString(TimeUnmodified,3,2));
    RTCTime.Day = wm_atoi(parseString(TimeUnmodified,6,2));
    RTCTime.Hour = wm_atoi(parseString(TimeUnmodified,9,2)) + 3;
    RTCTime.Minute = wm_atoi(parseString(TimeUnmodified,12,2));
    RTCTime.Second = wm_atoi(parseString(TimeUnmodified,15,2));
    adl_rtcSetTime (&RTCTime );
    wm_sprintf(atCmd, "\r\nGSM Time: \"%02d/%02d/%02d,%02d:%02d:%02d\"\r\n", RTCTime.Year - 2000, RTCTime.Month, RTCTime.Day, RTCTime.Hour, RTCTime.Minute, RTCTime.Second);
    TRACE((4, atCmd));
    ATRSP(atCmd);
    adl_atCmdCreate(atCmd, FALSE, (adl_atRspHandler_t) NULL, NULL);
	return TRUE;
}

Edit: The Output: GSM Time: "19/01/18,16:52:08"

YES, it is working. Everything is perfect till here.

I said “… till here” because I could not be able to use both of the functions together (turning on-off the GPRS LED and getting GSM network time). When I comment out one of them the other one is working. It is so strange to me. I am confused

Do you have any idea?

Thanks in advance.

Best regards.

MÇ.

jyijyi · January 18, 2019, 3:10pm

Network time should not be related to gprs.
You can try to get the network time first, then start the gprs.

mcaglar · January 21, 2019, 10:16am

I mean “GSM Network Time”. Sorry my bad.

jyijyi · January 21, 2019, 1:37pm

Can you receive event WIP_BEV_IP_CONNECTED after wind: 15 ?

mcaglar · January 22, 2019, 11:39am

Hi @jyijyi

Their times are very close. I mean the “WIP_BEV_IP_CONNECTED” and “+WIND: 15” message times. But I get the “+WIND: 15” message first.

Best regards.

MÇ.

jyijyi · January 22, 2019, 12:53pm

Since you can receive both event, Do you mean the problem is from adl_ioWriteSingle()?

mcaglar · January 22, 2019, 12:57pm

Hi @jyijyi

Thanks for your reply.

I will work on this later. This issue has not high priority at this moment.

I will post the result when I done it.

Best regards.

MÇ.

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