• State
  • Locked Locked
  • Replies 7 replies
  • Subscribers 51 subscribers
  • Views 692 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LAUNCHXL-CC26X2R1: basic ble example application; central role; gatt read error

Hannes Hugger
Prodigy 40 points

Part Number: LAUNCHXL-CC26X2R1

Hi,

I am using the basic ble example application on a CC26X2R1 Launchpad. I cofigured it to act in central role.

I managed to connect to the desired device.

I created the following function to read GATT characteristics:

But it doesn't return "SUCCESS". It always returns the error code 0x16 (blePending). 

can anyone tell me what my mistake is?

kind regards 

Hannes

  • 0
    TI__Mastermind 43400 points

    Hi Hannes,

    Can you share how you are calling the BleAppUtil_gattRead() function? I would like to see the context in which it is called in case that may be a factor here. Instead of calling the BLEAppUtil_getSelfEntity() earlier. Could you call it within the parameters? Something along these lines:

        status = GATT_ReadCharValue(connHandle, &req, BLEAppUtil_getSelfEntity());

    I would also ensure that the handle passed to the req variable is correct.

    Best Regards,

    Jan

  • 0 in reply to Jan
    Prodigy 40 points

    Thanks for your Answer!

    I am calling the BleAppUtil_gattRead() function within the event handler in app_pairing.c, when the event BLEAPPUTIL_PAIRING_STATE_BOND_SAVED occured (see picture below). I can imagine that this might be the problem but I didn't know where else to call it.

    regarding your other suggestions:

    I am sure that the handle passed to the req variable is correct, because it worked in a different programm before. I also tried calling BLEAppUtil_getSelfEntity() within the parameters as you recommended, but it didn't change anything.

  • 0 in reply to Hannes Hugger
    TI__Mastermind 43400 points

    Hi,

    No problem! Understood, thank you for the details. Could you try calling gattRead function using the BLEAppUtil_invokeFunctions() methods?

    These functions can be found in the BLEAppUtil_init.c file.

    Best Regards,

    Jan

  • 0 in reply to Jan
    Prodigy 40 points

    I tried using the invokeFunction methods but it didn't change anything. Calling GATT_readCharValue will still return the error code 0x16

  • 0 in reply to Hannes Hugger
    TI__Mastermind 43400 points

    Hi Hannes,

    We have released a GATT Client example on our ble_examples repo that implements GATT reads and GATT writes (alogn with notifications. Can you take a look at the example and see if it implements the desired functionality?

    Best Regards,

    Jan 

  • 0 in reply to Jan
    Prodigy 40 points

    It seems that it generally does. But in the documentation it says, that connecting to a GATT device which doesn't match the basic_ble_GATT_client Table will lead to errors. But i want to connect to a custom BLE device.

  • 0 in reply to Hannes Hugger
    TI__Mastermind 43400 points

    Hi Hannes,

    That is correct, by default the example will connect to another device that has the basic ble service. That said, you can use the code as a reference to see what is needed to be implemented on your side. I would recommend referencing the various GATT functions (GATT API Guide) as these provide means to identify which services a connected device has as well as which characteristics. It also allows you to find where in the GATT table a specific characteristic resides which can be used with the previously provided code to interact with a peers characteristics.

    Best Regards,

    Jan