Question about read operation

RE: Question about read operation

ilkobg — Tue, 15 Jan 2019 12:58:13 GMT

Hello,

Is there another way to update the data for a read-only characteristic, without using read authorization?

For example, is it possible when giving the characteristic initial values, to provide a pointer to a strucure which holds the data. You will update this structure and the data will be up to date when the characteristic is read.

RE: Question about read operation

Joe Merten — Wed, 28 May 2014 12:02:53 GMT

The function to be called is named sd_ble_gatts_rw_authorize_reply()

RE: Question about read operation

kchuva — Thu, 05 Dec 2013 14:19:33 GMT

Dear Ole Morten, why reason to this implementation of SoftDevice? If I want to Read value which changes in unknown time I can read it only With Authorization. So, I will spend more time to read one characteristic. Why Read Without Authorization Event don't pass to Application layer?

RE: Question about read operation

Ole Morten — Mon, 29 Jul 2013 12:36:01 GMT

Done. Didn't notice it was posted with an anonymous user. Thanks!

RE: Question about read operation

Ole Morten — Mon, 29 Jul 2013 12:26:04 GMT

No problem. Feel free to accept the answer, so that it's easier to find for others. :-)

RE: Question about read operation

Artem Zemlyanukhin — Mon, 29 Jul 2013 12:24:13 GMT

ok, thanks for response!

RE: Question about read operation

Ole Morten — Mon, 29 Jul 2013 12:10:47 GMT

Once you have enabled authorization for a characteristic, all reads will be authorized, so this shouldn't be a problem.

RE: Question about read operation

Artem Zemlyanukhin — Thu, 25 Jul 2013 08:22:40 GMT

Hi,

Thank you for answer. I saw 'Message Sequence Chart' for GATTS Read Request with Authorization.

As I understand I have no way of knowing about Read request without Authorization was processed?

Best regards, Artem Zemlyanukhin

RE: Question about read operation

Carles — Wed, 24 Jul 2013 21:01:16 GMT

Hi there,

Yes, you can.

You can use the authorization mechanism on any particular attribute to achieve this. Set the read authorization bit (rd_auth in ble_gatts_attr_md_t) when adding your characteristic to the attribute table and you will get a BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST event every time a remote peer tries to read that characteristic, and you can reply by calling the sd_ble_rw_authorize_reply() with the value you want.

Refer to the SoftDevice documentation for further details.

Regards,

Carles