RE: Sending configuration data from central to peripheral

Simon — Thu, 09 May 2019 11:35:29 GMT

There are roughly two ways of sending data between two devices in a BLE GATT connection. Depending on the direction of the data flow, the method differ. When sending data from a client to a server, a write is performed, and you are updating the values of a characteristic in the servers GATT table. When sending data from a server to a client, a notification is send, and you are notifying the client about a change in the GATT table.

Take a look at the ble_app_uart_c (central) example to see how a write is perfomed.

It is done in: uart_event_handle(..)-->ble_nus_c_string_send(.)-->sd_ble_gattc_write(..)

The last function is the one of interest to you.

Best regards,

Simon