How to transmit dynamic sensor datas on nrf52832 BLE?

RE: How to transmit dynamic sensor datas on nrf52832 BLE?

Einar Thorsrud — Mon, 26 Oct 2020 10:00:47 GMT

Hi,

Yes, this post in the thread you linked to shows how you can update advertising data.

RE: How to transmit dynamic sensor datas on nrf52832 BLE?

faithself — Fri, 23 Oct 2020 15:21:53 GMT

I find the ticket: https://devzone.nordicsemi.com/f/nordic-q-a/57324/confusion-about-new-style-of-manufacturer-specific-data-updating#permalink=532250. The solution is use two different advertise initialization with same contents except user-defined manufactor field.

RE: How to transmit dynamic sensor datas on nrf52832 BLE?

faithself — Fri, 23 Oct 2020 14:10:33 GMT

SDK is nRF5_SDK_17.0.2_d674dde, no permanent field at all.

ret_code_t ble_advertising_advdata_update(ble_advertising_t * const p_advertising,
ble_advdata_t const * const p_advdata,
ble_advdata_t const * const p_srdata)

RE: How to transmit dynamic sensor datas on nrf52832 BLE?

faithself — Fri, 23 Oct 2020 13:27:42 GMT

Thanks for reply. I want to advertise data that changes periodly, I create a 100ms timer to do it, I've implemented it with advertising manufactor field, and as you said, it needs stop and re-start the advertising, and sometime it triggers fatal error when I use nrf connect app to connect it. I'm very interesting in ble_advertising_advdata_update(), would you show me an example? I don't know what the adverting module is. I thinjk it can't be advertising_init() then advertising_start(). I want to advertise date continuously.

RE: How to transmit dynamic sensor datas on nrf52832 BLE?

Einar Thorsrud — Fri, 23 Oct 2020 12:24:46 GMT

Hi,

The RSSI is the power of the signal at the receiver end. That is not part of the advertising packet, but is status information you get in the receiver. (The Tx power level is sometimes part of the advertising packet, but then this is constant, so that the receiver can use that together with the RSSI to estimate distance.)

I think it would be good to look more specifically at what you want to achieve, which is not entierly clear to me. Can you clarify what you want to achieve? Is it to advertise data that changes regularly (i.e. update the advertising data regularly)? If so then you can set up an advertiser, and update the advertising data whenever you want by calling ble_advertising_advdata_update() if using the advertising module. You can also update it without using the advertising module but then you need to either alternate between two buffers, or stop and re-start the advertising after updating the data.