How does ENABLE NOTIFY work on the Peripheral side?

[daoms]

I'm playing the peripheral example hrs.

I find that when it received a enable notify(that is write cccd handle to 01 00) from the central, the code actually doesn't do anything.

So for writing cccd =1 is needed by SoftDevice or not? Which side's softdevice ,central or peripheral ?

If central doesn't write the cccd handle to 1, can peripheral still send the notification by sd_ble_gatts_hvx? can central receive this notification?

[Vidar Berg]

Hello,

The setting is updated in the Softdevice even if the write event is ignored by the app. The (optional) event is to let the application now if the client has updated the CCCD configuration.

sd_ble_gatts_hvx() will return with NRF_ERROR_INVALID_STATE if called when notifications are disabled.

[daoms]

That's reasonable, thanks.