CCS/CC2640R2F: Data Length Extension

Hello Moin,

I will assign your question to one of our experts.

In the meantime, can you please indicate what SDK and what project are you using?

Thanks,

Luis

Hello Luis,

I am using Project Zero, and the SDK Version is 3.20.0.21

Hi Moin,

Data Length Extension (DLE) has to be supported and activated on both sides of the communication.
Do you know which Bluetooth Low Energy version the Android phone uses? Do you know if DLE is supported by the Android phone?

I would recommend to take some BLE sniffer traces to verify:

• which BLE versions are used
• if the DLE request is properly sent
• if the DLE request is accepted
• the length of the PDU exchanged

I hope this will help,

Best regards,

Hello Clement,

I will check whether the BLE Scanner android app supports the DLE>

Also, as you recommended I will also go through the BLE scanner.

Can you guide me on how to use BLE sniffer?

Thanks and regards,

Moin

Hi Moin,

You may want to review our debugging guide to learn how to use our BLE Sniffer.

Regards,

Hello Clement,

I just wanted to ask whether or not do I need to use the cc2540 dongle to sniff the packets?

Hi,

You can use the BLE sniffer you want. I linked you to a BLE sniffer based on CC2652 / CC1352 devices but you can use a BLE sniffer based on CC2540 too :)

For other questions related to BLE sniffing please open a new thread.

Regards,

Hi Clement,

Can you please confirm that what I have done in the transmitting end (in programming terms) is correct?

uint16_t cxnHandle; //Request max supported size
uint16_t requestedPDUSize = 50;
uint16_t requestedTxTime = 422;
GAPRole_GetParameter(GAPROLE_CONNHANDLE, &cxnHandle); //This API is documented in hci.h
HCI_LE_SetDataLenCmd(cxnHandle, requestedPDUSize, requestedTxTime);

Is this enough to be done at the transmitting end? I am using the project zero application.

Regards,

Moin shaikh

Hi Moin,

Your code seems ok. It would be nice to have the sniffer traces mentioned earlier and verify if the request is accepted by the central device.

Best regards,

I have been experiencing trouble installing and running the Wireshark and smartrfsniffer. Even though I am installing both in their respective default locations, rfsniffer pops a message saying that I do not have Wireshark installed.

I am following https://dev.ti.com/tirex/content/simplelink_cc2640r2_sdk_4_30_00_08/docs/blestack/ble_user_guide/html/ble-stack-3.x-guide/debugging-index.html#packet-sniffer

Can you help me out?

Hi Moin,

Please open a new thread to discuss the issues related to Wireshark and smartrfsniffer.

Thanks!

Hi,

Sorry for wrong click on "TI thinks resolved". This won't change the way I handle the thread.

Moin Shaikh said:

is there any other way to very the packets? Any mobile application?

Nothing I know about - I usually point people to Ellisys products. I'll let you review this.

Kind regards,