Sort by » date activity ▼ answers views votes

# 153 questions

Tagged
• x
26
views
no
1

## Beacon and Central

Good afternoon.

I have 2 boards NRF51:

• One as beacon (SDK 9), use example code "nRF51_SDK_9.0.0\examples\ble_peripheral\ble_app_beacon".

• The other as central (SDK10, softdevice s130), use example code "nRF5_SDK_10.0.0\examples\ble_central\ble_app_uart_c" to read beacons ...

(more)

14
views
no
no

## NRF HRS peripheral to NRF HRS central

I am trying to get a NRF HRS central (ble_app_hrs_c) to make a connection to a NRF HRS peripheral (ble_app_hrs). However, the peripheral does not show up whenever the central scans for HRS device(s). Meanwhile, the HRS peripheral appears ... (more)

35
views
1
vote
1

## How to use ble_app_uart_c for custom UUID service?

Hello!

We're using the SDK 12.1 ble_app_uart_c as an example for a nRF52 DK as Central application. Instead of using ble_app_uart example for peripheral device, we created a new custom service based on ble_app_template example for our peripheral ... (more)

12
views
no
no

## ble central transmit data to ble peripheral interval?

I download the example of multilink central (S130) into nrf51822 .The central transmit 20 bytes to peripheral interval 50ms sometimes will reset.Anybody know the bluetooth to send and receive the largest interval?

24
views
1
vote
1

## Central Scan and Peripherial Slave latency

I keep having problems like frequent disconnects (reason 0x08 = BLE_HCI_CONNECTION_TIMEOUT) and NRF_FAULT_ID_SD_ASSERT on my NRF52832 (tested with S132 v3.1.0 and V5.0.0-alpha1) with the central scanner enabled, that vanish when switching the slave latency on the peripherial ... (more)

48
views
1
vote
2

## Is it possible to Connect Multiple centrals to single peripheral nrf51 dk?

I want my nrf51422 dk acting as peripheral should able to connect multiple mobile phones near to it. How I can achieve this?

46
views
no
1

## Communication between nrf52

hi, i was looking for example of two nrf52 communication. One is central of course and other one is peripheral. But i have following doubts. 1. If one is central then how peripheral device will connect to central? Are we ... (more)

27
views
1
vote
1

## BLE Central Server multiple Peripheral Clients

I need to have a Central device physically connected (via UART) to a sensor. Data is collected from the sensor and sent to a number of Peripheral devices which use the data to perform a task.

So far I have ... (more)

35
views
3
1

## In BLE role, does Service or characteristic exists on Central?

I'm aware of GATT's Profile, Service and Characteristic. And also, for GATT_Server, GATT_Client it can be Central or Peripheral. (As I manually set it.)

And also, the Bluetooth Communication Sequence goes like this.

1. Central try for Peripheral Search ...
(more)

119
views
2
1

## BLE Central disconnect after exactly 65.5 sec

Hi,

I'm having a problem at the moment with code based on Espruino on nrf52.

I connect as follows:

  ble_gap_scan_params_t     m_scan_param;
memset(&m_scan_param, 0, sizeof(m_scan_param));
m_scan_param.active       = 1;            // Active scanning set.
m_scan_param.interval     = MSEC_TO_UNITS(100, UNIT_0_625_MS); // Scan interval ...
(more)

487
views
2
1

## NRF52 ble_db_discovery failed to initialize correctly when repeats the service discovery

Hi

We are using NRF52 and SDK 11 and S132.

The nrf52 acts as a central and selectively connects to the closest phones (ios) that are acting as a pheripheral. For this purpose we have 4 characteristics (TX, RX, RSSI ... (more)

50
views
1
vote
1

## Receiving internal error on securing BLE link [closed]

At the moment I am working on a project that uses the nRF52328 acting as both a peripheral and central to connect 3 separate devices intermittently. I am storing their bonding information. A current problem I have now is that ... (more)

62
views
1
vote
1

## Strange behavior in central device using nrf51822 [closed]

Hi, I'm using a nRF51822 as a observer/scanner for Eddystone beacons. This device is intended to scan up to 16 beacons, but under certain conditions (unknown at this moment) the scanner becomes unresponsive and keeps "broadcasting" one of ... (more)

37
views
no
1

## S132 central find service with 128bit uuid

Hi, I'm trying to modify one of the examples (the hrs_relay) to find my custom service to identify the device uniquely. I know I need to add the 128bit uuid using and then use that handle, but am getting ... (more)

30
views
no
no

## BLE HR C Example - Repeated BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION

Hi,

I am attempting to run the examples of BLE HRS C and BLE HRS Peripherals from the SDK. Getting to the connected state works (discovery and notifications as well) just fine. But the two seem to always disconnect after ... (more)

64
views
no
no

## What might cause HardFault on sd_nvic_critical_region_enter

I have an nrf51822AC chip connected to another ARM based processor which provides a CAN interface. The two are connected via the UART and we are using the ble_connectivity software in connection with the S120 softdevice on the nrf51.

So ... (more)

118
views
no
2

## RSSI measurement for each peripheral s130 or 132

Hi, I want to get the RSSI for each peripheral that is connected to an nRF52 when it is operating as a multi-link central to multiple peripherals. Helpful hints? Sample code?

Thanks!

69
views
no
1

## Central role with high Bandwidth problem

Hi,

I am using a custom board with a nrf51422, SDK11, S130 v2.0.1 with central role.

I have made changes on the code to change from MID bandwidth to High. I added the following code to the ble_stack_init ... (more)

33
views
2
1

## What to choose to that project - peripheral or central?

Just a beginners question. I've read about central, peripheral, client, server, but i am still not sure how to choose. I use nrf51822

I want to create a beacon that has two buttons called "1" and "2". If somebody ... (more)

51
views
no
1

## BLE Nano printing

I am using the example ble central devices from the SDK 8.1. The example provided prints out to pin 19 (the on-board LED). I wanted to change the functionality to print to an external LED that was attached to ... (more)

29
views
1
vote
1

## white list for central

Hello dear Nordic team,

we want to implement a white list to our central device in the production process. Bonding while producing is not an option for us.

Therefore we have an idea and I would like to know if ... (more)

54
views
no
1

## Consecutive reading for each connection event?

Hi,

As I know that one reading operation requires 2 connection events: First - ATT Read Request Second - ATT Read Response

My question is: Is it possible to send the next ATT Read Request in the same ... (more)

89
views
no
1

## Central - use public address

Hi. I'm new to Nordic BLE devices. Using the nrf51-DK. I have a peripheral device (non-Nordic) which I want to connect to from a Nordic central (S130) using the public address. It seems that by default the address used ... (more)

44
views
no
1

## is the tx power configurable for nrf51422 rev 3 with ble

we use nrf51422, rev 3, sd 130 1.0.0, with ble central functionality and we look for a example to set the tx-power as high as possible.

55
views
2
1

## NRF51822 IRAM1 Settings (multilinkCentral Projects)

Hi, Im using Nrf51422 DK board. When I try the ble_app_multilink_central example in the SDK12, it works on the DK board. But it does not work in NRF51822. (NRF51822 QFAA)

I tried the settings on this link but it ... (more)

83
views
no
no

## Need assistance with nRF52 firmware

Hi there,

We've had our own custom controller made, based on nRF52 (Rigado BMD-300 module).

In the last half of January we'll have a baseline firmware working, but we need someone to continue the work on extended functionality ... (more)

85
views
no
no

## Characteristics when connecting a peripheral to central

Hi, I have a peripheral device which has buttons that connects to a central device which is the NRF52 board. When the peripheral device is connected and buttons are inputted, the characteristics of the button are not displayed on the ... (more)

37
views
1
vote
no

## multilink central send byte packets

Hi, I use Multilink Central and Experimental_ble_app_blinky examples.

Multilink Central sends only 1 byte. I want to send more. Blinky does not work when I change the code. MultiLink will send 10 bytes and it will get Blinky.

What should ... (more)

247
views
1
vote
2

## How to change from BLE central to peripheral mode by buttons

Hi, I was wondering how to change from central mode of the NRF52 board to peripheral mode and from peripheral mode to central mode by pressing the input buttons on the board. For example, button 1 would enable the central ... (more)

92
views
no
1

## sd_ble_gap_connect NRF_ERROR_INVALID_PARAM whitelist

Hi every one.

I am developing on S130 SDK 11 and I try to use whitelist connection for optimisation. I have currently a working project which scan for 1 sec for any BLE and then try to connect each one ... (more)

#### Statistics

• Total users: 17051
• Latest user: Jaxon Clement
• Resolved questions: 8868
• Unanswered questions: 2386
• Total questions: 20786

## Recent blog posts

• ### Getting started with Nordic's Secure DFU bootloader, a step by step guide

Posted 2017-03-20 17:13:52 by Hung Bui
• ### From Nordic UART Service to MicroPython using PolyMCU and Gattlib

Posted 2017-02-27 16:40:00 by Olivier
• ### Throughput and long range demo

Posted 2017-02-28 16:48:25 by Ole Bauck
• ### nRF52840 long range demo

Posted 2017-02-14 12:46:03 by Ole Bauck
• ### Setup and Running the OpenMesh DFU on the nRF52 DK v2.0

Posted 2017-02-06 22:33:25 by martindavidb

## Recent questions

• ### what kinds of flag Do I set, when I use sdk13 in keil-c debug mode

Posted 2017-03-24 10:41:29 by Vincent
• ### The peak current of nRF52832

Posted 2017-03-24 10:16:17 by Stanley
• ### multiple definition of `SPI1_TWI1_IRQHandler'

Posted 2017-03-24 10:03:43 by ashare
• ### Questions about BLE multirole LESC

Posted 2017-03-24 09:50:09 by Fabien Comte
• ### can i put my nrf51822 in sleep mode..?

Posted 2017-03-24 07:54:34 by iqbalpalemad