WL1835MOD: How to set up custom services and characteristics for BLE GATT?

Hi Jesus,

Attached is a offline copy of the WL18xx demo guide:

/cfs-file/__key/communityserver-discussions-components-files/968/TI_5F00_Bluetooth_5F00_Stack_5F00_for_5F00_WL18xx_5F002D005F00_Demo_5F00_Guide.pdf

Also attached is the GATM guide, in case you need that as well.

/cfs-file/__key/communityserver-discussions-components-files/968/WL18xx_5F00_TI_5F00_Bluetooth_5F00_Stack_5F00_GATM_5F00_Demo_5F00_App.pdf

As for creating a custom GATT service, I suggest you take a look at the SPPLE_PM demo. That demo implements SPP as a custom service over GATT, and you can adapt the functionality shown in the SPPLE demo to perform your own custom functionality. The demo guide is attached.

/cfs-file/__key/communityserver-discussions-components-files/968/WL18xx_5F00_TI_5F00_Bluetooth_5F00_Stack_5F00_SPPLE_5F00_PM_5F00_Demo_5F00_App.pdf

You shouldn't need to perform any modification of the BTS file loaded by the Bluetopia stack. Modification of the BTS file is generally only needed if you have certain startup requirements such as a specific RF power table. For your custom GATT service, modifying the application code directly is sufficient.

Regards,

Michael

Hello Michael,

Thank you for your reply; however, this isn't quite what I am looking for.  Further investigation within LinuxSPPLE_PM.c revealed that ConfigureSPPLE uses a  custom service for SPPLE as you mentioned.  What I would like to know is how to create my own service and characteristics.  Furthermore, it was found that there exists two commands that appear to do what is needed:  CreateSDPRecord and AddSDPAttribute. 

Is there a in-depth guide as to how to use these commands to make the desired services and characteristics?

Hi,

For BLE services, simply advertising with GATT advertisements is sufficient. SDP is not needed, and as such in the BLE examples in the SDK the CreateSDPRecord functions are only dummy sample functions.

I suggest you take a look at the remaining BLE samples that setup custom services for more guidance. For example, the LinuxHOHM example is also built on top of the generic GATT example.

Regards,

Michael

Michael,

I will look into what you have suggested and I will get back with my findings.  I do have a question, where can I find updated and online documentation about the various Bluetopia applications?  Most of the documentation I have come across has been removed.

Regards,

Jesus

Hi Jesus,

The online documentation is currently being migrated away from the decommissioned wiki. While this effort is being performed, I can fetch and provide offline copies of the Bluetopia documentation.

Is there a specific example, profile, or document that you are looking for?

Regards,
Michael