RE: Setting up Bluetooth exchanges message "0x0100" - why?

bjorn-spockeli — Wed, 02 May 2018 14:50:56 GMT

Miriam: The ble_app_uart examples uses two characteristics TX and RX to exchange information, data from the central to the peripheral is written to the peripherals RX characteristic. Data from the peripheral is notified from the TX characteristic to the central

The handle 0x0E corresponds to the UART RX characteristic, the handle 0x0B corresponds to the UART TX characteristic and 0x0C corresponds to the CCCD of the TX characteristic

Q1: The handle 0x0C corresponds to the CCCD of the UART TX characteristic, i.e. notification is being enabled.

Q2: Yes, from the central side you could not enable notifications, but then the peripheral would not be able to send the data to the central. THe central would then have to "poll" the peripherals TX characteristic by reading it regurarly to see if there is any new data.

Q3: All BLE events passed on from the SoftDevice will go through on_ble_evt(ble_evt_t * p_ble_evt) in main.c

Q4: Take a look at the Message Sequence Charts for the S130 v2.0.1 SoftDevice, here is the link to the Infocenter page.