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CC2650: "maximum size of the data buffer = 27" restriction

Tayyaba Zainab
Prodigy 35 points
Part Number: CC2650
Other Parts Discussed in Thread: BLE-STACK

Hi there,
I am using cc2650 with Bluetooth v.4.0.
When I try to send a packet of 100 bytes my L2CAP layer is dividing the packet into chunks of 27 bytes and sending it fragment by fragment.When we are allowed to send ~260 bytes over the data channels then why there is this fragmentation? how can I resolve this? how can I send this whole packet at once (unfragmented)?
 

  • 0
    TI__Guru* 81711 points
    Hi Tayyaba,

    This is a limitation in the Bluetooth 4.0 Core Spec. If you want to send longer packets your device must support the Bluetooth 4.2 feature Data Length Extensions.

    The CC2650 device supports Bluetooth 4.2 and Data Length Extensions. Please download the latest version of the BLE-Stack (2.2.2) for CC2650 to use this feature. (link: www.ti.com/tool/ble-stack )