RE: Custom Service Setup in Central

Susheel Nuguru — Thu, 15 Aug 2019 10:42:59 GMT

Hi Gerber,

[quote user=""]Is the ble_app_uart_c project a suitable template for adding code to recognize a custom service?[/quote]

You need to modify ble_nus_c.c so that it recognizes your customer UUID: For now you can see that it is designed to work with NUS_BASE_UUID. Also ble_nus_c_on_db_disc_evt is trying to match BLE_UUID_NUS_SERVICE so that it can lock itself to this service handle. NUS_C example gives a good starting template for you to figure how how initializng the central and locking to the service works.

[quote user=""]If yes, do I directly modify the ble_nus_c.c file to do this?[/quote]

That is correct.

[quote user=""]Which functions, header files, C files and defines specifically should I focus on when making modifications?[/quote]

in ble_nus_c_on_db_disc_evt to listen to your service handle instead of BLE_UUID_NUS_SERVICE
save all the handle values of all 5 characteristics you just discovered. The template example only saves two (BLE_UUID_NUS_RX_CHARACTERISTIC and BLE_UUID_NUS_TX_CHARACTERISTIC)
handle on_hvx if there are any notification enabled in any of your characteristics
ble_nus_c_init needs to be changed to discover your primary service instead of BLE_UUID_NUS_SERVICE
The reset of the functions in ble_nus_c.c are helpers to work with handles on BLE_UUID_NUS_RX_CHARACTERISTIC and BLE_UUID_NUS_TX_CHARACTERISTIC. If you want to handle your writes and reads differently, then you modify these helpers accordingly.

/Susheel