CC2755R10: Use of "Service changed"

Akihiko Fujinaka

Expert 3465 points

Part Number: CC2755R10

Tool/software:

Hello expert,

1. CC2755R10 can support "Service changed" ?

Our customer wants to change the GATT service and characteristics.

2. If above is possible, Is it required to disconnect the BLE connection to use the "Service Changed"?

Regards,

A.Fujinaka

2 months ago

0 Maxence Mathieu 2 months ago

TI__Expert 5000 points

Hi !

The F3 SDK API does not expose any function that allows to add one single characteristic. However it allow to add and remove entire services, by using the functions GATTServApp_RegisterService and GATTServApp_DeregisterService. These functions do not require the user to disconnect the BLE connection, but it does need a way to inform the central that the services have changed.

This can be done by using the service changed characteristic. The peripheral would change its GATT Services with the API functions mentioned above, and then send an indication to the service changed characteristic to inform the central. The central then needs to re-discover the GATT table, just as it does currently in the customer's firmware.

Kind regards,
Maxence

0 Akihiko Fujinaka 2 months ago in reply to Maxence Mathieu

TI__Expert 3465 points

Hello Maxence,

I understand that the F3 SDK API does not expose any function that allows to add one single characteristic

So, is it correct that if we want to change the configuration of characteristics, we need to follow this steps?

1. Delete the Service by GATTServApp_DeregisterService

2. Change the Characteristics configuration and re-register the Service by GATTServApp_RegisterService

Regards,

A.Fujinaka

0 Maxence Mathieu 2 months ago in reply to Akihiko Fujinaka

TI__Expert 5000 points

Hi,

Yes this is correct.

Kind regards,
Maxence

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CC2755R10: Use of "Service changed"