RE: nRF52 ble to ble transfer continuous data for

joshu2991 — Fri, 30 Oct 2020 05:09:11 GMT

Hi, I would like to update this ticket and provide the information I used to resolve my question, so that if anyone else requires it they can help with my response.

I ended up using characteristics to be able to send and receive information with a cell phone and used the nRF52832 as a peripheral. For the number sequence I simply created a counter and send the data via a characteristic with the function:

static void on_write(ble_os_t * p_our_service, ble_evt_t const * p_ble_evt)

I hope this serves someone else, the characteristics method is a very effective and continuous method. Have a very good day!

RE: nRF52 ble to ble transfer continuous data for

joshu2991 — Fri, 14 Aug 2020 15:12:07 GMT

Thank you Simon! I must read and try with all this information that you have kindly given me, I thank you for all the attention.

Have a very good day!

RE: nRF52 ble to ble transfer continuous data for

Simon — Fri, 14 Aug 2020 15:06:05 GMT

If the nRF52832 is the GATT server and the phone is the GATT client (read about the roles here) the way to send data to the phone, is through notifications, and that is done through the call sd_ble_gatts_hvx(). The function ble_nus_data_send() (nRF5_SDK_17.0.0_9d13099\components\ble\ble_services\ble_nus\ble_nus.c) is an abstraction layer on top of that, which will notify to the TX characteristic of the NUS Service. So ble_nus_data_send() should be the best option for you, if: You want to use the NUS service (which seems like a good choice regarding your end goal) and if nRF52832 is a server.

This function can not be used for receiving data, only notifying data to the client

You should not use ble_nus_data_send() in on_ble_evt(..). To reach your end goal of sending a value every 10 seconds, you should make some kind of timer and run it every 10 seconds instead.

Yes, this should be possible. You should not worry about adding any delay, as the SofDevice will handle the scheduling.

If the nRF52832 is the server and the phone is the client, the WRITE operation needs to be used. To receive the WRITEs on the server (nrf52832), you need to set up an observer function with NRF_SDH_BLE_OBSERVER() and look for the BLE_GATTS_EVT_WRITE events. However, in the ble_app_uart example, this is done and you will receive the writes in the function nRF5_SDK_17.0.0_9d13099\examples\ble_peripheral\ble_app_uart\main.c-->nus_data_handler()

I would recommend you to check out the sample nRF5_SDK_17.0.0_9d13099\examples\ble_peripheral\ble_app_uart and go through the steps under Testing, which demonstrates how you can send data forth and back between a phone (using nRF Connect) and an nRF52832.

These tutorials may also be useful:

Best regards,

Simon