# 209 questions

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## connection request to a known address

Hi guys, I want to ask if it is possible for a nrf51822 to connect to a Central ( my cell phone) without advertising. Let assume that my cell phone has nrf51822's MAC address from the first connection and it ... (more)

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## How can I measure the advertising intervals of a peripheral?

I would like to know how frequently my peripheral is sending advertising and data packets. I've tried using ble-sniffer-osx but it doesn't actually reveal any device names for some reason, so it's not trivial to use. Is ... (more)

31
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I found out answers for calculating data rate during connections, which depends upon connection interval, no of packets allowed in each connection and no of bytes in a single packet.

However, how can I calculate data rate applicable during sending ... (more)

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## setBeaconLayout on Android-Beacon Library

Has anyone successfully used the Android-Beacon Library to detect the nRF51822 Beacon on and Android application? I tried several different layouts but I just can't detect it.

public class MainActivity extends AppCompatActivity implements BeaconConsumer {

protected static final String TAG ...
(more)

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## nRF51822 - Connect without advertising

In short:

• Is it possible to connect a nRF51822 s110 peripheral from a central without the need for sending advertising packets (by peripheral)?
• If (hopefully) yes, what's the required steps (shure, the central must know the MAC)?

A stupid ... (more)

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## Is it possible to advertise more than 31 bytes of data using S140 SoftDevice version 5.0.0-3.alpha?

I'm using the with SDK version 13.1.0 along with S140 SoftDevice v 5.0.0-3.alpha and trying to utilize the Bluetooth 5 Extended Advertising feature.

The function ble_advdata_set() limits the data size to BLE_GAP_ADV_SR_MAX_LEN_DEFAULT which is ... (more)

33
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Can a BLE peripheral listen for scan requests or any commands from BLE central without making any advertisements? If this is possible, then it would save on the transmission power required for sending advertisements.

Also, can a BLE central send ... (more)

103
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## High power consumption after disconnect

Hi,

I've just hit a strange issue with SDK 12.1 on nRF52832.

Usually on BLE_GAP_EVT_DISCONNECTED, sd_ble_gap_adv_start gets called to start advertising and everything's great.

However, if I don't call sd_ble_gap_adv_start, advertising stops (as you'd expect ... (more)

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## Advertising with device_name Vs whitelisting

I am confused with whitelisting and advertising/scanning with device name

I have a peripheral and a central device, peripheral device is advertising with device name set as 'PERIPHERAL_DEVICE' and my central device is scanning for the name 'PERIPHERAL_DEVICE' (m_target_periph_name ... (more)

51
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1
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## MPU data in dynamic advertising packet

Hi friends...!

I want to put dynamically changing MPU data into the advertising packet. I am putting my accelerometer data into manufacturer specific data field of ble_advdata_t structure. but the problem is that the data is not changing with every ... (more)

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## DFU Service in scan response advertising data

Hi,

I am designing a BLE Device based on nRF51822, which broadcast three services : one home made service, the Battery Service, and the DFU service for the OTA update.

When the device is advertising, it is supposed to broacast the ... (more)

65
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## Beacon disconnects and stops transmitting after a period of time

Good Afternoon,

I hope someone can point me in the right direction.

We've customised an NRF51822 beacon and made it into a sensor but there seems to be an strange error, I'm a bit lost as to where ... (more)

78
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## How to make nrf51822 generate advertising one time(just one time) and then disable the advertising?

Hi dear all: The question as the title says, Thanks in advance !

127
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## how to set the advertising intervals to 30 seconds?

Hi,

I am using the nRF52-DK as a device like beacon encodded with the original code of "nRF5_SDK_13.0.0_04a0bfd\examples\ble_peripheral\ble_app_beacon. I want to change the advertising intervals to 30 seconds. However, the maximum advertising intervals is limited ... (more)

82
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## S140 - Non connectable advertising interval

Hi everyone!

My question is for engineers of Nordic. I need to apply NRF52840 as a "beacon". As there is no ready templates of beacons in nRF5_SDK_13.0.0-1alpha_055eef3, I took as a basis the template "ble_app_beacon_pca10040_S132" (NRF52832) and ported ... (more)

468
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## nRF52 DK - 20ms non connectable advertising interval

Hello, im experimenting around with the nRF52 DK (and nRF51 DK also)

Now I have following setup on nRF52 DK:

SoftDevice: s132 nRF52 v2.0.1

Applicatoin: Example Project from nRF SDK 11.0 (ble_app_beacon)

By the default the interval ... (more)

70
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1
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1

## Is it possible to know whether advertising packet is connectable or non connectable in Android?

Hi,

Is it possible to know which type of advertising packet is being advertised by the slave i.e whether it is a connectable or a non connectable advertising packet by the master device?

830
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## Device name too short?

When trying out the ble_app_hrs_freertos example in nRF5 SDK 11.0.0-2.alpha_bc3f6a0, I seem to only get 14-character long device name announcements.

This happens when using components/softdevice/s132/hex/s132_nrf52_2.0.0-7.alpha_softdevice.hex.

106
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1

## Advertising Bluetooth LE 128-bit vendor specific UUID

I am wondering what is the logic and magic behind using sdk API's to advertise vendor specific 128-bit service UUIDs. In the "Nordic UART Service" example (nus, SDK12.2.0) there is:

static ble_uuid_t                       m_adv_uuids[] = {{BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE}};  /**< Universally unique ...
(more)

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## Sometimes the android app(especially vivo phone)can not scan the device

The vivo phone sometimes cannot scan the device, There are two devices embedded same program. However,one of them can be scanned,the other one can not. The advertising packet shows as follows:

I can not find the wide difference ... (more)

81
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Hello, I am using an nrf51822 but have no success in advertising. I tried so far to load the ble_app_template from the peripheral examples where I' ve only changed

 #define APP_ADV_INTERVAL                10


I tried to load another ... (more)

103
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Hi,

Similar questions have already been posted but they don't seem to fit to my problem...

Basically I want to advertise 3 primary services, starting from the 'experimental_ble_app_blinky' example: the already provided lbs service and two new ones. For ... (more)

65
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## Is the advertising module removed from docs?

I am programming a beacon, first I had some problems using sd_ble_gap_adv_start() so I changed to ble_advertising_start().

Now I have a problem when compiling:

_build/nrf52832_xxaa_main.c.o: In function advertising_start':
/Users/.../pca10040/s132/armgcc/../../../main.c:388: undefined reference ...
(more)

52
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2

## Concurrent peripheral and advertising s110

Our nRF51822, S110 device uses concurrent advertising (iBeacons) when connected to the central. Our customer would like to have a variable tx power on the advertising packets only. Is there any way we could do this?

155
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2

I would like to hide BLE advertising from normal BLE scanner software. And only be able to see such advertising with dedicated scanner.

I was thinking of changing access address from 0x8E89BED6 to something else which would hopefully cause normal ... (more)

86
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## nrf51822 advertising packet not detected

Hi,

I would like to ask your support for a very unusual problem that I'm facing with a project based on nrf51822.

The board under test is based on nrf51822, SDK12.1, softdevice S130. The nordic example used for ... (more)

67
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1
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1

## eddystone different advertising interval for each slot

Hi!

I am working with experimental_ble_app_eddystone in SDK 12.2.0 for nRF52. I have seen that the firmware does not support using different advertising inteval for each slot of advertised packets.

Is it right or am I misunderstanding something ... (more)

191
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1
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2

Simple question:

• I successfully use ble_advertising_init () with adv_data, scan_data and adv_opts.
• I include manufacturer data via scan_data.p_manuf_specific_data = &manuf_data. This also works well

Now I want to change my advertising packet by dynamically altering one byte only in my manuf_data ...` (more)

203
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1
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1

## Advertise on one channel at a time - app_timer problem

Hi DevZone

I want to make a little beacon app, that advertises on channel 37 then waits 700 ms, advertises on channel 38, waits 700 and advertises on channel 39. The below is what i have implemented, yet it doesn ... (more)

155
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2
2

Hello, I've been trying to get directed advertising and auto-connection working on an NRF51822 peripheral.

I'm using SDK V11.0 with SD130 v2.0.1

This is the scenario I'd like to get working:

• Start normal (fast ...
(more)

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## Recent blog posts

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