NUS example - sd_ble_gatts_hvx returns error number 0x3003

[MANGO]

SoftDevice : S110 7.1

SDK 7.2

Example : experimental_ble_app_uart

Using IAR 7.1

Using nRFGo Studio 1.19.0

Board : PCA10001 V 2.0.0 (Rev. 2 MCU)

Test device : Nexus 5 (Android 5.1.1) and iPhone 6+ (iOS 8.4)

Toolbox App Version : 1.14.1 (at Nexus 5) & 2.1 (at iPhone 6+)

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When using the example, I added some codes.

I added a timer and the timer handler sends message to the connected centrals every 3 seconds.

This is the value of m_nus after when I set the NUS's RX Characteristic to "NOTIFY"

(using Master Panel Control App).

After connecting with the central, it works.

However, after a minute or so, ble_nus_send_string returned BLE_ERROR_INVALID_ATTR_HANDLE.

In other words, sd_ble_gatts_hvx returned BLE_ERROR_INVALID_ATTR_HANDLE 0x3003.

When it returns this error code, the value of m_nus was like this.

What could be the reason?

Added : 23, July, 2015 : Like this?

Before)

The peripheral sends string "S" to the central using a timer interrupt.

The duration is 1 second.

After)

-Regards, Mango922

[Susheel Nuguru]

looking into SDK7.2\components\softdevice\s110\headers\ble_err.h

#define BLE_ERROR_INVALID_ATTR_HANDLE    (NRF_ERROR_STK_BASE_NUM+0x003) /**< Invalid attribute handle. */

seems like the p_hvx_params used in sd_ble_gatts_hvs has invalid handle in it. have you changed anything in this code or using it as it is? Just adding timer should not effect this unless the timer handler is trying to do and HVX before the handle is initialized.

[MANGO]

I modified ble_hrs.c. Execpt that, I didn't made a change.

Then what could be the reason for this?

Is there a chance that I made a pointer operation and changed some values of m_nus?

(Also, I apologize for writing the wrong error type. I edited it.)

[Susheel Nuguru]

Did you compare if the contents of m_nus and hvx_params when it succeeds and when it failed. can you also show the contents of hvx_params like you did with m_nus.

[Susheel Nuguru]

They clearly seem to be different handles p_nus->service_handle p_nus->tx_handles p_nus->rx_handles these cannot change for a characteristic, seems like memory corruption

[MANGO]

Hmm... This sounds like a big trouble...

Can you recommend me some analyzing tech for this?