7,358 questions

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issues with writable characteristic

I have a service a writeable characteristic and I'm finding the following issues.

Characteristic is read/write, not variable length, size of 4, no read or write auth, no extended attributes (ie no reliable/long writes)

1. If I write ...
(more)

18
views
no
1

Changing the transmission power with every set of 3 advertising messages

Hi,

I would like to change the transmission power of the beacon kit so that I can switch back and forth between high and low tx powers for each set of advertising messages (3 messages sent on3 different channels). That ... (more)

20
views
no
2

nrf_gpio_pin_set() causes reset

I have a modem connected to some pins on an nRF51822 on a custom board. Two pins on the modem are active low. One is a reset pin, the other a VCC control. I want these pins on the Nordic ... (more)

52
views
1
vote
1

Programming nrf51822 with openOCD and STLink-v2 issues

I want to flash a firmware on my nrf51822 module I was trying an example from Nordic, I concatenated the bin file with the s110 file and it worked fine. Now, when I went ahead to flash the bin file ... (more)

15
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1

GATT client (ANCS example) : adding ANCS UUIDs on the client app

Hi,

I'm exploring the ANCS example with SD130 SDK 8.1.0 ...

The application acts as a GATT client to receive notification from GATT server on the iPhone. I see in the service_init function that the code calls 4 ... (more)

33
views
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1

SDK7 to SDK8.x.x migration guide

Is there any document that describes what has to be done in the App code to migrate from i.e. SDK v7.2 to the latest 8.1.1? I could not find it.

Ideally it would be nice to ... (more)

27
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1

Nrf51822 ESB doesnt provide optimum data rate

Hey, I use ESB protocol on nrf51822. I am using one Pipe currently I can achieve only 183 Kbps, I read that i can achieve 1Mbps data rate if we use ESB. I have few questions 1) Can we achieve ... (more)

22
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1

multiple packets per interval for s120

Hi,

Last year, I heard that nordic semi will release a SoftDevice for central that supports mulitple packets per interval time until June, 2015.

For now, I guess s120 ver 2.0 still supports only ONE Tx and/or Rx ... (more)

352
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1
vote
2

Input buffer connected in nrf_gpio_cfg_output() of the SDK

My understanding so far is that the input buffer of GPIO is disconnected by default and we can keep it disconnected for saving power when the pin is configured as output. Is there a reason why nrf_gpio_cfg_output() in the latest ... (more)

18
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1

Data Rate increase using wireless Protocols in nrf51822.

Hello, I just read this paper "High speed data streaming with nRF24L01 " where we can achieve 1.6 Mbps Data Rate in clean RF environment. I am currently using nrf51822 in my project. I want atleast 1 Mbps Data Rate ... (more)

10
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16bits to 128bits to 16bits convert problem

When discovering services using nrf51-ble-driver_win_0.4.1 driver, some ID are received with type BLE_UUID_TYPE_UNKNOWN. So I assume they are 128bits. I then retrieve the 128bits value (using sd_ble_gattc_read) and then register it using sd_ble_uuid_vs_add. This works fine and retrieve ... (more)

19
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1

No input and output capabilities, possible security

Hi BLE Developers,

I'm developing a BLE peripheral device using S110 softdevice which doesn't have any input or output capabilities and will communicate with smartphone. Just works pairing method doesn't satisfy for my project requirements. I don ... (more)

17
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1

I would like to use nRF2460 in my project (Hearing Aid for elder people).In that I need to transmit the data from a mic/line in to >30 receivers within a range of 100 yards.can I use nRF2460 ... (more)

22
views
1
vote
1

I am trying to make my NRF 51 advertise forever till someone connects. I have based myself on the ble_uart example where it uses fast advertising with 40 ms intervals for 180 seconds.

Now, I changed to slow advertising with ... (more)

16
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1
vote
1

The documentation for ble_evt_hdr_t says that the evt_len field is

Length in octets excluding this header.

However as far as I can tell it's actually the length in octets including the header.

Here's the code I'm using ... (more)

16
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1

Watchdog drv undeclared NRF_DRV_WDT_DEAFULT_CONFIG

Hello all,

When I try to implement the new watchdog driver it keeps saying that the NRF_DRV_WDT_DEAFULT_CONFIG is undeclared. What am I missing I have all the requered files included identical to the example.

//Configure WDT.
nrf_drv_wdt_config_t config = NRF_DRV_WDT_DEAFULT_CONFIG;
err_code ...
(more)

20
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1

Changes Required to make ibeacon connectbale

Hi, Can someone tell what and all changes are required to implement connectable nRF based Beacon with iOS8 based application. Regards, Raju

21
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1

S120 throughput

Hi to all!

I have few questions about throughput when using s120:

1. What is the max number of packets that could be send/received in one connection interval when using S120? (s120 specification, chapter 13 says 1tx/1rx, Hung Bui ...
(more)

2
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Setting "Custom Data" in nRF51-ble-bcast-mesh

I am using BLE_Gateway example defined in nRF51-ble-bcast-mesh to create an rbc_mesh over 2 nRF51422 devices. For now, I am just testing it out on 2 nRF51422; I will set up more devices to create the mesh later.

Now, using ... (more)

24
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1

How to handle characteristic data?

Hello,

For me, at the moment there are two things unclear. With the help of some Nordic examples, I was able to add a Service with 3 characteristics to the used S120 BLE stack. Im able to connect to ... (more)

89
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1

Transmitting 6 packets

Hi there,

I am trying to send six 20 byte packets per connection interval. Is changing the length of charecteristic simply

attr_char_value.init_len     = sizeof(uint8_t)*20;
attr_char_value.max_len      = sizeof(uint8_t)*20;


and then also the gatts value length to

gatts_value ...
(more)

15
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1

S130 stack : app acts as GATT client and server

Hi,

I need to implement an application who acts like a GATT client and gets notification from a GATT Server (on smartphone) and then sends the information to a GATT Client acting as GATT server. I think that it could ... (more)

30
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1
vote
1

nRF51422QFAA+S310 DFU implement problem

Hi All,

I try to implement the DFU funtion in my module, but the message return is “Not Supported”.

Thanks.

Vic

From reference the "nRF51_Series_Compatibility_Matrix_v2.1", I choose my development environment ... (more)

7
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Static Passkey with PCA10028 board and UART example

Dear Nordic Developers

I'm using ble_app_uart example with PCA10028 development board. SDK version is 8.0.0. I'm trying to program the PCA10028 board for having a static passkey. Below you can see my modified and added code ... (more)

18
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1

ble_app_uart

Hi,

Which peripherals and related interrupts are used in ble_app_uart example provided in the SDK?

81
views
1
vote
2

App timer limit

Hi, I'm using a simple timer with interval set using "APP_TIMER_TICKS(1.4, APP_TIMER_PRESCALER)" alongside softdevice. Now i'm trying to get it to go faster but it would advertise for at most 3 seconds and then the system ... (more)

50
views
1
vote
2

Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

Hello,

I'm trying to do some simple printfs to hyerperterminal as a way to debug my code. I have used the uart example init code but nothing prints:

void init_uart(void)
{
uint32_t err_code;
const app_uart_comm_params_t comm_params =
{
RX_PIN_NUMBER,
TX_PIN_NUMBER,
RTS_PIN_NUMBER ...
(more)

42
views
no
1

Basic UART over BLE?

I'm trying to enable basic commands with my device. Ideally I have a terminal open on a mac running nodejs or use the UART subapp in the nRF Toolbox App, type a special command character then press transfer.

There ... (more)

15
views
1
vote
1

DFU using IAR Embedded Workbench

Hi,

I am developing a glucose application. I need to implement DFU along with it. I am using IAR Embedded Workbench as development platform. Could you please guide us through as to how to go about this?

Thanks

16
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Flashing an hex file to Red Bear Lab BLE Nano (nRF51822) from command line

I am using the eclipse/gcc toolchain as explained in this tutorial. I am able to generate and flash my application code and softdevice separately using hex format.

I am using the flash and flash_softdevice` targets defined in the makefiles ... (more)

Statistics

• Total users: 4991
• Latest user: vored1965
• Resolved questions: 3489
• Total questions: 7358

Recent blog posts

• Parse MQTT message in Wireshark for IoT test

Posted 2015-05-26 04:06:12 by Jun Qing ZOU

Posted 2015-05-25 10:09:29 by Jun Qing ZOU
• Workaround needed for TWI driver (nrf_drv_twi) in SDK v8.1 (TWI_COUNT missing)

Posted 2015-05-20 13:40:08 by Hung Bui
• Programming the nRF51822 Beacon Kit with the nRF51DK

Posted 2015-05-07 16:13:39 by Fredrik Sundt Brynhildsvoll
• Common FAQ on DFU

Posted 2015-05-15 19:46:33 by Hung Bui

Recent questions

• issues with writable characteristic

Posted 2015-05-30 11:17:29 by RK
• SDK7 to SDK8.x.x migration guide

Posted 2015-05-29 22:16:14 by Pektusin
• Changing the transmission power with every set of 3 advertising messages

Posted 2015-05-29 22:05:34 by Sarah
• GATT client (ANCS example) : adding ANCS UUIDs on the client app

Posted 2015-05-29 17:34:42 by ppatierno
• nrf_gpio_pin_set() causes reset

Posted 2015-05-29 16:48:04 by Eliot Stock