sd_ble_gatts_characteristic_add,argument p_cccd_md

[volanda]

Hi,

In SDK nRf51-SDK_9.0.0.2e23562, I call sd_ble_gatts_characteristic_add().

I set the p_cccd_md read_perm as BLE_SEC_MODE1LV2 or BLE_SEC_MODE1LV3, and set write_perm as BLE_SEC_MODE1LV1.

sd_ble_gatts_characteristic_add() return 7,it means argument Invaid.

But I set p_cccd_md read_perm as BLE_SEC_MODE1LV1 , and set write_perm as BLE_SEC_MODE1LV1.sd_ble_gatts_characteristic_add() return success.

And I set p_cccd_md read_perm as BLE_SEC_MODE1LV2 ,and set write_perm as BLE_SEC_NOACCESS.

sd_ble_gatts_characteristic_add() also return success.

I don not konw why

[Petter Myhre]

Per spec the CCCD should be readable with no authentication and authorization, that's probably why the first returns invalid argument. See this.

For the third I'm not sure, but it doesn't make much sense to have a CCCD that you can't write to.