CC2642R: Need to receive events from BLE stack on connection start and connection end event

Mehul Dalal

Part Number: CC2642R

Hello,

I am using "GapAdv_create()" and callback as a parameter in it to receive advertising module related events "GAP_EVT_ADV_START" and "GAP_EVT_ADV_END".

I would like to register for similar events for connections start and end.

Let me know which document i need to refer or any example in order to understand the same.

over 3 years ago

0 Ammar N over 3 years ago

TI__Mastermind 25810 points

Hey Mehul,

I'm assuming you're working with the latest SDK, but the below should apply to previous SDKs too.

Here are some references to our SimpleLink Academy Modules, which you will find helpful moving forward: https://dev.ti.com/tirex/explore/node?node=AAqqwhkEV.0hRKMj.vsvTA__pTTHBmu__LATEST

Here's a link to our User's Guide for more in depth documentation on the BLE5 stack: https://dev.ti.com/tirex/content/simplelink_cc13x2_26x2_sdk_4_30_00_54/docs/ble5stack/ble_user_guide/html/ble-stack-5.x-guide/index-cc13x2_26x2.html

If you take a look at gap.h, you'll find the below API that you can use to register for connection event callbacks:

extern bStatus_t Gap_RegisterConnEventCb(pfnGapConnEvtCB_t cb,
                                         GAP_CB_Action_t action,
                                         uint16_t connHandle);

0 Mehul Dalal over 3 years ago in reply to Ammar N

Expert 2140 points

Hello Ammar,

I am not sure if this is a correct callback I can register for. In the example Simple Peripheral project, this API used for calling the callback which has "Pointer to report describing the connection event Gap_ConnEventRpt_t *pReport".

So, I believe that I can not get CONNECTION START event from this callback. Here is the function header of this callback in gap.h:

/**
* GAP Callback function pointer type for Connection Event notifications.
*
* When registered via @ref Gap_RegisterConnEventCb, this callback will return
* a pointer to a @ref Gap_ConnEventRpt_t from the controller after each
* connection event
*/
typedef void (*pfnGapConnEvtCB_t)

Can you tell me how I can get CONNECT START event from the BLE stack?

0 YiKai Chen over 3 years ago

Guru 735455 points

Using simple_peripheral as example, I suppose check "case GAP_LINK_ESTABLISHED_EVENT:" and "case GAP_LINK_TERMINATED_EVENT:" in SimplePeripheral_processGapMessage to know device get connected and disconnected.

0 Mehul Dalal over 3 years ago in reply to YiKai Chen

Expert 2140 points

I do know about these events and being meant for a scenario when the connection is established and disconnection.

What I want is to have CONNECTION START and CONNECTION END event which gets repeated for every connection interval.

0 Ammar N over 3 years ago in reply to Mehul Dalal

TI__Mastermind 25810 points

Hey Mehul,

To be clear, when you mean CONNECTION START/END, you are referring to the start/end of each single connection event and not the initial connection and disconnection (please correct me if I'm wrong).

If the above suggestion doesn't provide what's needed, you can also try using the HCI_EXT_ConnEventNoticeCmd event to register for the CONNECTION END callback.

https://dev.ti.com/tirex/content/simplelink_cc13x2_26x2_sdk_4_30_00_54/docs/ble5stack/ble_user_guide/doxygen/ble/html/group___h_c_i.html#ga48c34bf7059b2e104e4756256572a9a1

0 Mehul Dalal over 3 years ago in reply to Ammar N

Expert 2140 points

HI Ammar,

You are right. I am looking for START and END event for each connection interval. The earlier suggested method did not work as well.

The suggested HCI_EXT_ConnEventNoticeCmd() appears to give event from the stack when Connection event ends. How to get Connection Start event?

Mehul

0 Ammar N over 3 years ago in reply to Mehul Dalal

TI__Mastermind 25810 points

Hey Mehul,

The BLE stack doesn't return a callback by at the beginning of a connection event. May I ask why you need this functionality? Perhaps I can help meet your requirement in a different way.

0 Mehul Dalal over 3 years ago in reply to Ammar N

Expert 2140 points

Hi Ammar,

In our design, we need to perform certain timing related operations when CONNECTION START is received. This is very much required for our design.

Mehul

0 Ammar N over 3 years ago in reply to Mehul Dalal

TI__Mastermind 25810 points

Hey Mehul,

Let me look into this further to ensure there's nothing I've missed and I will follow up soon.

0 Ammar N over 3 years ago in reply to Ammar N

TI__Mastermind 25810 points

Hey Mehul,

Unfortunately, I was unable to find a way to receive a callback before the connection event starts. There are potential workarounds by setting a callback when the device boots, but there's no way to know the reason the device has woken up. Some more info here: https://e2e.ti.com/support/wireless-connectivity/bluetooth/f/538/t/417853?Synchronize-task-to-LE-Connection-Event-using-CC2640

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CC2642R: Need to receive events from BLE stack on connection start and connection end event