RE: Sending data from central to peripheral

PW — Thu, 12 Mar 2020 09:44:54 GMT

Thanks for the hint. In fact I mixed attriibutes and additionally I used data structures "write_params_t" and "tx_message_t" wrongly. After a bit longer analyze your links and "ble_app_uart" I handled with my problem. I adapted "ble_app_blinky" to my needs and everything works fine :)

Best regards,

RE: Sending data from central to peripheral

Simon — Tue, 10 Mar 2020 10:52:18 GMT

I think you are mixing the CCCD attribute with the LED Button attribute. You should not modify the length of the CCCD, since this is not where the data is actually being sent. The CCCD is used by the GATT client to control what packets the GATT server can send to it, and any characteristics which have notifications or indications enabled will have a CCCD associated with it. Since the CCCD can only be equal to either 0x00, 0x01 (notification) or 0x02 (indication), it doesn't make sense to make it larger than 2 (BLE_CCCD_VALUE_LEN).

These links may be helpful:

Best regards,

Simon