characteristic write

[fanqh]

How to add characteristic write only in peripheral server

and how to know the char was write

[MartinBL]

Hi. I'm not sure if I quite understand what you mean. If you want to apply "write-only" permissions to your characteristic you can set the relevant bits in the GATT Characteristic Properties before you call sd_ble_gatts_characteristic_add(). Have a look at the examples in our SDKs.

When your characteristic is written to you will get a BLE_GATTS_EVT_WRITE event from the Softdevice with this data.