Several questions about sparkfun nrf52840 BLE connections

[BMG]

Hello Nordic,

I have several questions regarding the BLE connection. I have 2 sparkfun nRF52840 boards and an android phone (android 6.0).

This is my scenario:

    - the android phone connects to nRF1 and transmits some data .

    - then, nRF1 connects to nRF2 and transmits also some data.

    - at the final, nRF2 connects to android phone and transmits other data.

Can you help me, please, telling how to solve this circle of connections? I don't think that my phone supports peripheral mode. So, if my phone can be only in the central mode, that means that the boards have to be in peripheral mode, but being in peripheral, the boards can't talk to each other or do you have an example in the SDK to be able to do this?

Thank you.

[BMG]

Hi,

I'm flashing using the USB cable and running some adafruit commands from terminal.

I want to find out where in the code of ble_app_uart (peripheral), I write something to the central so that is called BLE_NUS_C_EVT_NUS_TX_EVT in central (ble_app_uart_c).  I really need this information because I want to do the same in ble_app_multiperipheral.

[Simonr]

Hi

I suggest you take a look at the ble_app_uart (peripheral) and ble_app_uart_c (central) examples for a better look at how the Nordic UART service works and how it should be handled, etc. as the documentation explains it better than I'm able to in a single comment.

Best regards,

Simon

[Simonr]

Hi

In that case, there must be something wrong in your ble_nus_data_send() function. If you have an extra nRF5x DK you can sniff the connection, to see if the data is sent at all, and what exactly happens to it using our nRFSniffer for Bluetooth LE.

Best regards,

Simon

[BMG]

Yes, you're right.

I don't have an extra nRF5x DK, but I know that on ble_app_uart, sending a string from peripheral to central has no problem.

I verified better in ble_nus_data_send() and I get NRF_ERROR_NOT_FOUND from sd_ble_gatts_value_get(). 

I saw that this error means Attribute not found, but I really don't know how to solve it because in ble_app_uart, I don't have this problem

[Simonr]

Okay, I think this is due to the connection handles not being handled correctly. In the on_connected() function in main of the original multiperipheral example, where nrf_ble_qwr_conn_handle_assign() is called in this example, the connection handle is an array. You can see how this connection handle is used in the led_status_send_to_all() function. This is how the connection handle should be sent into ble_nusdata_send() in your example as well.

Best regards,

Simon