How do I clear the Attribute Table?

[JamesB7]

Hello,

There are functions such as sd_ble_gatts_service_add. But, how do I clear the Attribute Table to replace it with a new one? I want to do this switching at runtime, but I see no function at all to do anything but add to it.

Thanks!

James

[bjorn-spockeli]

HI James, 

the only way to clear the Attribute table is to uninitialize the BLE protocol stack and then reinitialize the BLE protocol stack and then add the new services/characteristics/descriptors using sd_ble_gatts_service/characteristic/descriptor _add(). 

Best regards 

Bjørn

[JamesB7]

Are all of the libraries coded to support this case properly (nrf_sdh_disable_request I assume), or would it be better to do it using NVIC_SystemReset? Thanks!

[bjorn-spockeli]

Yes,  nrf_sdh_disable_request() is the gentle way. You can also call sd_softdevice_disable() directly. Using one of the two former calls avoids a reset, but calling NVIC_SystemReset() is also an option, but then you would have to use a retained register or a flag stored in flash to decide how the ATT table should be populated.