Communicate in BLE with NRF52 using Android

RE: Communicate in BLE with NRF52 using Android

Hung Bui — Thu, 21 Jan 2016 07:59:00 GMT

Hi Vivien,

Please have a look at our examples the nRF5 SDK v.11. For example the experimental_ble_app_blinky where you can turn off and on an LED using an app (nRF Blinky) You can find the app source code here.

Note that we don't call sd_ble_gatts_value_get() to get the value of the characteristic to change the LED state but we catch the BLE_GATTS_EVT_WRITE event to change the LED state.

RE: Communicate in BLE with NRF52 using Android

Vivien — Wed, 20 Jan 2016 17:51:06 GMT

Hi Hung, Thanks again four your help and your time. For the moment, I'm able to write on a characteristic of the card using an external Android app called : BLE Scanner. I'm writting on the characteristic : "Device Name" under the service "Generic Access Service". Now I would like to compare this value with another value and then turn on a LED on the board. The point is I don't know how to call the function "sd_ble_gatts_value_get()" in the main file (especially the attribute tu use : conn_handle & handle). Do you have an example of this function ?

Thanks again for your time.

RE: Communicate in BLE with NRF52 using Android

Hung Bui — Wed, 20 Jan 2016 10:14:45 GMT

@Vivien: You don't have to access RAM directly to get the char value. You can call sd_ble_gatts_value_get() to get the value of a characteristic.

RE: Communicate in BLE with NRF52 using Android

Vivien — Wed, 20 Jan 2016 09:00:14 GMT

Hi Hung,

Thanks for your advice, I'll take a look in the RAM if I can retrieve my value.

RE: Communicate in BLE with NRF52 using Android

Hung Bui — Tue, 19 Jan 2016 09:45:00 GMT

Hi Vivien,

Please have a look at our example apps, such as the nRF UART app or the nRF Toolbox app. You can find how to do a write on a characteristic. The value of a BLE characteristic is stored in the Attribute table on RAM (could be in the Stack's RAM area or in the application's RAM area)