How to Write Without Response when transmitting from NUS Central Sample

[James.Buel]

Hi,

Is it possible to use write without response when sending data from NUS Central app?

I'm using NCS SDK v1.50

I replaced in nus_client.c:

err = bt_gatt_write(nus_c->conn, &nus_c->rx_write_params);

with

err = bt_gatt_write_without_response(nus_c->conn,nus_c->handles.rx, data, len, false);

and receive following output when try to send:

[00:00:08.968,872] [1;33m<wrn> central_uart: NUS send timeout[0m
[00:00:08.968,872] [1;33m<wrn> central_uart: Failed to send data over BLE connection(err -69)[0m
[00:00:09.118,988] [1;33m<wrn> central_uart: NUS send timeout[0m

Thanks!

[Jørgen Holmefjord]

Hi,

Error -69 means "Operation already in progress". Have you called the function more than once?

It is possible that the error comes from this section, if you get an error on the first call.

Best regards,
Jørgen