S132 Attribute Table Size

RE: S132 Attribute Table Size

bjorn-spockeli — Thu, 29 Sep 2016 10:59:51 GMT

Happy to help ;) I would appreciate if you could mark the answer as correct(click the check mark in the circle tot he left of the answer).

RE: S132 Attribute Table Size

oneguy — Thu, 29 Sep 2016 10:58:21 GMT

Thanks :-)

RE: S132 Attribute Table Size

bjorn-spockeli — Thu, 29 Sep 2016 10:40:10 GMT

Yes, you are correct. The attribute table will not increase in size after you have added all your services and characteristics.

RE: S132 Attribute Table Size

oneguy — Thu, 29 Sep 2016 10:36:27 GMT

Hi Bjørn,

Thank you - that's how I have done it.

Please confirm: Once I have finished calling sd_ble_gatts_service_add and sd_ble_gatts_characteristic_add the attribute table has grown to its final size and will never expand again?

Regards Matthias

RE: S132 Attribute Table Size

bjorn-spockeli — Thu, 29 Sep 2016 09:10:28 GMT

Hi Matthias,

I am afraid that there is no way to calculate the attribute size for a given number of services and characteristics( the internal build-up of the attribute table is "hidden" in the SoftDevice, which is not public information).

You will get the NRF_ERROR_NO_MEM error when you add services and characteristics with sd_ble_gatts_service_add and sd_ble_gatts_characteristic_add and the attribute table size is to small. Thus, finding the correct attribute is a process of trail and error, i.e. increase the attribute table size until you dont get any errors.

-Bjørn