Wake on button press, connect with master and transmit button state

RE: Wake on button press, connect with master and transmit button state

Sigurd — Mon, 08 Jul 2024 19:23:15 GMT

[quote user="Roger D"]Why can't I successfully send data to the Client unless I wait for at least 750msec? Thanks much for your time.[/quote]

The central would potentially need to do a service discovery first, and also if you are sending this as a notification, the central would need to enable the CCCD for the notification.

RE: Wake on button press, connect with master and transmit button state

Roger D — Sat, 29 Jun 2024 23:33:57 GMT

Thanks for your comments. I have successfully implemented pairing and bonding and my connection time is reduced. That's a good thing.

A follow up question:

I previously asked:

3. Any suggestions on how to transmit the button press event byte to the central?

You stated:

Maybe you can use the Queue library for this. Queue the button presses, and when you get the connected event, and/or are ready to send the data, you get the button presses from the queue, and then send the data.

When I attempt to transmit data to the client in the connected event no data is sent (as per sniffer). When I start a Timer in the Connected Event and load it with a value that gives a 700msec time out and then call

 send_data_to_client(uint32_t cmd)

within the Timer event handler, no data is sent to the client. When I load the timer with a value that gives a 750msec time out, data is successfully sent to the Client.

Why can't I successfully send data to the Client unless I wait for at least 750msec? Thanks much for your time.

Connected Event based on ble_peripheral_hrs:

#define TILT_UP 1

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            printf("Connected.\n ");
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
            err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
            APP_ERROR_CHECK(err_code);

            send_data_to_client(TILT_UP); // this doesn't work here

        break;
_______________________________________________________

Transmit packet to client sub:

void send_data_to_client(uint32_t cmd)
{
    ret_code_t      err_code;
    uint16_t        heart_rate;

    heart_rate = (uint16_t)cmd;

    err_code = ble_hrs_heart_rate_measurement_send(&m_hrs, heart_rate);
    if ((err_code != NRF_SUCCESS) &&
        (err_code != NRF_ERROR_INVALID_STATE) &&
        (err_code != NRF_ERROR_RESOURCES) &&
        (err_code != NRF_ERROR_BUSY) &&
        (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
       )
    {
        APP_ERROR_HANDLER(err_code);
    }
}

sss

RE: Wake on button press, connect with master and transmit button state

AMarch — Mon, 20 May 2024 12:59:39 GMT

I asked a similar question and was directed to an older project , which will probably need updating to use the new SDK 17.0.2.
GitHub - NordicPlayground/solar_sensor_beacon

That said, all new development is going to be in the nRF Connect SDK (I am a little sad about that myself, but ...progress must move forward). The quicker you try to translate this into the newer code, the happier you may be.
A M

RE: Wake on button press, connect with master and transmit button state

Sigurd — Mon, 13 May 2024 11:29:34 GMT

Hi!

[quote user=""]1. Is there anyway to get around the negotiation time? Does connecting to a previously paired device cut down on the negotiation time? Current negotiation time is too long to meet my requirements.[/quote]

If you bond to the device, you can skip doing e.g. service discovery each time you connect. Also you control both sides of the BLE link, so any connection interval negotiation, etc., is fully up to you.

[quote user=""]

2. I searched examples, nothing. Do you know of any example code?

3. Any suggestions on how to transmit the button press event byte to the central?

[/quote]

Maybe you can use the Queue library for this. Queue the button presses, and when you get the connected event, and/or are ready to send the data, you get the button presses from the queue, and then send the data.

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/lib_queue.html

PS: If this is a new project, I recommend using nRF Connect SDK.

https://www.nordicsemi.com/Products/Development-software/nRF-Connect-SDK

RE: Wake on button press, connect with master and transmit button state

Hakon — Fri, 10 May 2024 12:46:23 GMT

Hello,

most of the staff is away for vacation, so there will be some delays in response time. Thank you for your patience.