CC3200 fails to auto-connect to wlan after hibernate

Peter Archer

Other Parts Discussed in Thread: CC3200

My CC3200 Launchpad fals to auto-connect back to the wlan after it comes out of hibernation. The connection policy was set to Auto + SmartConfig. If I manually reset the device while waiting for the auto-connect it will work perfectly.

I terminate the wlan connection and stop the NWP device with a 5 second (5000 ms) delay prior to starting hibernation.

I can successfully config it with my iPhone during this 2 minute wait period.

Here is a snap of pressing reset. Obviously the profile and connection policy is still set OK. There is something in the NWP that is treating a hibernation restart differently to a normal restart

This seems to make the hibernation feature pretty useless unless the customer is always handy with his smart phone app whenever hibernation occurs :-)

Peter

over 11 years ago

0 Jitendra Gupta over 11 years ago

TI__Guru 70190 points

Peter,

Can you please confirm the following-

- Profile is not get deleted (sl_WlanProfileDel) anywhere in the code flow.

- Set wlan policy (sl_WlanPolicySet) with 'SL_CONNECTION_POLICY(1, 0, 0, 0, 1)' policy. (you may have done this)

- After device is coming up from hibernate,try to check wlan policy (sl_WlanPolicyGet). Is this same which has been set to device?

Regards,

Jitendra

0 Peter Archer over 11 years ago in reply to Jitendra Gupta

Intellectual 330 points

I think with your first two bullets, if either were the case it wouldn't work when I press "Reset".

I will do a PolicyGet on restart from hibernate and post what I see. It may be Monday before I get to that though

Thanks

Peter

0 Jitendra Gupta over 11 years ago in reply to Peter Archer

TI__Guru 70190 points

Hi Peter,

I have tried the same scenario here, where application does-

1. If reset cause not hibernate

a. sl_start

b. policy set to Auto+Smartconfg (SL_CONNECTION_POLICY(1, 0, 0, 0, 1)) while calling wl_WlanPolicySet

c. reset NWP (sl_stop + sl_start) to let network policy come in effect.

2. This is common either device comes up from hibernate/reboot

a. sl_start (after this start Wi-Fi Starter application 1st time)

b. Loop till connect and IP_acquire event arrives.

c. after connect to an AP, send some TCP/UDP packet to any pre-defined client

d. AP disconnect and switch off the NWP (sl_stop)

3. Goto hibernate with wake time set.

It works here for multiple iteration in hibernate case.

Check your steps in case you are missing something and inform us.

Regards,

Jitendra

0 Peter Archer over 11 years ago in reply to Jitendra Gupta

Intellectual 330 points

Jiendra

Well step 2b is the problem:

The IP acquire event never arrives after hibernate. If I power cycle or press the reset button it works flawlessly

Everything else listed I do. It all basically copied from your wlan_station demo code.

I've tried:

1. On hibernation restart I've tried reenabling/reestablishing Connection Policy and DHCP, doing a SOCReset and delaying 30 seconds before doing sl_start, all to no avail.

Peter

0 Peter Archer over 11 years ago in reply to Peter Archer

Intellectual 330 points

Issue is solved

The code I have in the WLAB_Start function is:

	VOGW_Console_Log ("<<< Wireless Lan recovery started >>>");
	status = sl_Start(0,0, 0);				// start the WLan
	sysStatus |= VOGW_WLAN_STARTED;

	if (status != ROLE_STA) {

and over in the WLAN_Event handler:

oid SimpleLinkWlanEventHandler(SlWlanEvent_t *wlanEvent) {
	int		i;
	char	msg[50];

	if (!(sysStatus & VOGW_WLAN_STARTED))
		return;

    switch(wlanEvent->Event) {
        case SL_WLAN_CONNECT_EVENT:
        	sysStatus |= VOGW_WLAN_CONNECTED;

The Fix is:

	sysStatus |= VOGW_WLAN_STARTED;
	status = sl_Start(0,0, 0);			// start the WLan
	if (status != ROLE_STA) {

WLAN_STARTED flag is to ensure that spurious WLAN events are discarded unless the WLAN is started. Howerver on a hibernation restart, the WLAN connected event is received before the WLAN_STARTED flag is set. Setting the flag immediately before, rather than immediately after issuing the sl_start solved the problem

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CC3200 fails to auto-connect to wlan after hibernate