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What causes GATT write to fail on different failure for same procedure like here?

Deep Mukherjee
Prodigy 135 points
Other Parts Discussed in Thread: CC2564, CC256XSTBTBLESW

We are trying to communicate with a third party BLE device using GATT and custom API.

The procedure we following is-

Step 1: Connect to device

Step 2: Search for specific custom UUID.

Step 3: Write command to charectistics if found.

Step 4: Read response back from the characteristics.

Step 5: Disconnect the device.

In any step failure we disconnect and wait for 10 - 180 seconds.

Now we are testing the above logic repeatedly.

1. Connection request some time responding with successful connection after 2-3 minutes.

2. I found once in few try, the write command is failing but different time with different reason-

What can possibly cause this kind of failure? Is there any known way to handle this other that resetting stack?

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  • 0
    TI__Guru* 85400 points
    Hi,

    Can you please confirm which device this is? Also, please confirm the API that is causing the above errors.

    Regards,
    Gigi Joseph.
  • 0 in reply to Joseph Gigi
    Prodigy 135 points
    This CC2564 chip working with one 3rd party BLE based sensor.
    Failure is coming from-
    ret_val = GATT_Write_Request(BluetoothStackID, LEContextInfo[LEConnectionIndex].ConnectionID, gSenseHandle, 2, (void *) Data, bt_GATT_ClientEventCallback, U8_BT_PARAM_STATUS_WRITE_REQ);

    The return value of this call.
  • 0 in reply to Deep Mukherjee
    TI__Guru* 85400 points
    Hi,

    Can you please confirm if this is the API that is indeed failing - or is it one of their application defined errors?
    Because as per the "GenericAttributeProfileAPI.pdf" document, GATT_Write_Request() returns the below errors:

    BTGATT_ERROR_INVALID_HANDLE_VALUE
    BTGATT_ERROR_INVALID_CONNECTION_ID
    BTGATT_ERROR_INSUFFICIENT_RESOURCES
    BTGATT_ERROR_NOT_INITIALIZED
    BTGATT_ERROR_INVALID_BLUETOOTH_STACK_ID
    BTGATT_ERROR_INVALID_PARAMETER

    These are between (-1000) and (-1013)

    Regards,
    Gigi Joseph.
  • 0 in reply to Joseph Gigi
    Prodigy 135 points
    I know I did not find the answers in pdf.
    This is the exact code running-
    /* Verify that we discovered the Device Name Handle. */
    /* Attempt to read the remote device name. */
    ret_val = GATT_Write_Request(BluetoothStackID, LEContextInfo[LEConnectionIndex].ConnectionID, gSenseHandle, 2, (void *) Data, bt_GATT_ClientEventCallback, U8_BT_PARAM_STATUS_WRITE_REQ);
    if (ret_val > 0)
    {
    //Success
    //Send check sensor request and move to next state
    printf("\n\r write success");
    }
    else
    {
    printf("\n\r Write Fail: %d",ret_val);
    }

    and the GATT_Write_Request is part of library so do not have any source code.
  • 0 in reply to Deep Mukherjee
    TI__Intellectual 2360 points

    Deep,

    Looking into it. Do you have any logs? Either air sniffer or HCI? Which Bluetopia SDK are you using? Which version?

    Thanks,
    Samuel

  • 0 in reply to Samuel
    Prodigy 135 points

    I do not have any sniffer with me. I can generate HCI log if you can guide me in this.

    The stack we are using is version 13, this is provided by stonestreet one for NXP processor. 

  • 0 in reply to Deep Mukherjee
    TI__Intellectual 2360 points

    Hi Deep,

    Please try to reproduce this issue on a TI-supported platform, such as the STM3240G-EVAL with a TI Bluetooth SDK (CC256XSTBTBLESW) and let me know if you are still having the issue.

    Thanks,
    Samuel