CCS/CC2640R2F: CC2640R2 - IPHONE 7 issue with 3rd connection

Hi Shri,

Can you use the Heap Manager to check the heap status when the connection fails? software-dl.ti.com/.../

Hi Marie,

Thanks for the reply..

As per the discussion with TI support team, we have compiled latest production stack V1.50.00.58 - Multi Role project. In that also we are facing the same issue. I will check the heap manager and ping you asap.

Why we cant able to connect with more than 2 - IPHONE7 But we are able to connect with 4 - IPHONE6.

Do we need to change any parameter for this ?

Could you able to tell me what will be the exact problem ?

Thanks,

Hi Shri,

While you are checking on the heap usage as requested by Marie, please see this section of our BLE SW User Guide:
"RAM Considerations when using DLE"
software-dl.ti.com/.../data-length-extensions.html

It's possible your heap is getting consumed by the iPhone 7's DLE request. You can disable the DLE feature by following the procedure in the aforementioned user guide.

Looking forward to your heap usage report.

Best wishes

Hi,

I have enabled HEAPMGR_METRICS macro, as mentioned in the document. We flashed and trying to connect with the same 3 IPHONE-7 NRF tool.

One phone is getting connected without any problem. But the second IPHONE-7 are sending the Establish link request and connection is done but its not asking for any MTU_SIZE_EXCHANGE and not asking for service UUID.

When we are continuously trying to connect this case. Some time the Second IPHONE-7 will get the SUUID and get connected after (4 to 5) seconds. But Third IPHONE-7 is not asking for the MTU_SIZE_EXCHANGE / SUUID.

Did i need to enable anything else for the heap manager ?

Thanks for your support. We are in final stage of production. Kindly support us asap.

Hi Shri,

You have to enable the HEAPMGR_METRICS predefine in the predefined compiler symbols. (Project -> Properties -> Build -> ARM Compiler -> Predefined Symbols.)

If you want to disable DLE in your device you can use HCI_EXT_SetLocalSupportedFeaturesCmd():

// featSet is an array of bytes representing features supported
// of the Device. Clear DLE Feature bit
CLR_FEATURE_FLAG( featSet[0], LL_FEATURE_DATA_PACKET_LENGTH_EXTENSION );
HCI_EXT_SetLocalSupportedFeaturesCmd( featSet );

Hi Marie,

I have checked the app code of Multi-Role and found that, This sections are already defined (as USE_LL_CONN_PARAM_UPDATE macro is not defined).

switch (command_complete->cmdOpcode)
{
case HCI_LE_READ_LOCAL_SUPPORTED_FEATURES:
{
if (pktStatus == SUCCESS)
{
uint8_t featSet[8];

// get current feature set from received event (bits 1-9 of
// the returned data
memcpy( featSet, &command_complete->pReturnParam[1], 8 );

// Clear bit 1 of byte 0 of feature set to disable LL
// Connection Parameter Updates
CLR_FEATURE_FLAG( featSet[0], LL_FEATURE_CONN_PARAMS_REQ );

// Update controller with modified features
HCI_EXT_SetLocalSupportedFeaturesCmd( featSet );
}
}
break;

default:
//do nothing
break;
}
----------------------------------------------------------X--------------------------------------------------------------------X------------------------------------------

You have to enable the HEAPMGR_METRICS predefine in the predefined compiler symbols. (Project -> Properties -> Build -> ARM Compiler -> Predefined Symbols.)

YES, this also done.

Still we cant able to connect with 3rd IPHONE-7.

Thanks,

Hi Shri,

Out of curiosity, did you try disabling the DLE by fixing the TX & RX sizes @ 27 bytes as per the procedure I posted in the link above?

Best wishes

Hi JSX,

We tried to connecct with disabled DLE as you suggested.
Still the third connection is showing the same scenario...
DLE disable: Is it required to be configured for each connection or once at device initialization is enough?

FYI:
stack in use: simplelink_cc2640r2_sdk_1_50_00_58

We are using default HostTest project with following Predefined Symbols added/modified in App project:
MAX_PDU_SIZE=60
MAX_NUM_PDU=20
GATT_DB_OFF_CHIP
MAX_NUM_BLE_CONN=5
CC2640R2_LAUNCHXL // Custom target board chipset is CC2640R2FRSM, tried same with Launchpad XL. Hope, it doesn't matter.
xPOWER_SAVING // in stack project also this is redefined to disable POWER_SAVING feature.


Please reply...

Hello Arun,

Please provide or confirm the code addition to disable DLE follows our documented procedure in the BLE User Guide:

If you are still having issues,  please capture and attach a BLE air sniffer log showing the non-paired iPhone 7 connection.

Best wishes

Hi Arun,

With the NOTIFY method, the concept is to transmit several packets in one connection event to transmit more data per connection event/interval. Using this method you can transmit more than 20 bytes per connection event, but still only 20 bytes per packet.

(Note that iPhone limits the number of packets per connection event, which undermines this method.)