sd_ble_gatts_hvx() returns NRF_ERROR_INVALID_STATE (error code 8)

[armin]

Hi

Try to send characteristic notification by invoking sd_ble_gatts_hvx() with the following parameters:

	uint32_t err_code = NRF_SUCCESS;
	ble_gatts_hvx_params_t params;

	memset(&params, 0, sizeof(params));
	params.type = BLE_GATT_HVX_NOTIFICATION;
	params.handle = GetValueHandle();
	params.p_data = pData;
	params.offset = 0;
	params.p_len = &length;

	if (srv::ble::ConnectionHandleInvalid != mrBleInterface.GetConnectionHandle())
	{
		err_code = sd_ble_gatts_hvx(mrBleInterface.GetConnectionHandle(), &params);
		assert(err_code == NRF_SUCCESS);
	}

Unfortunately, the error code 8 NRF_ERROR_INVALID_STATE occurs. The connection is established and bonding is completed. ( checked by the DM_EVT_LINK_SECURED event from the device manager)

Do you have any suggestion what "invalid state" coulde be?

Thanks for your help.

BR Armin

[kkmoua]

I have a similar issue as this. Using the Master Control Panel application on my Android device to connect to my nRF51822 module (acting as the GATT server), I have implemented the Device Manager onto my BLE module and am able to bond the phone and device. I then set notifications enabled onto my custom service through the phone, and start sending notifications from my module by pressing a key on my keyboard (UART communication). This works fine but once I disconnect with the phone and try to reconnect, it shows on the Master Control Panel that notifications are still enabled and that I don't have to write and set the CCCD value of the same characteristic value I was notifying before disconnection. However when I start sending notifications, it is displayed on my terminal that I am getting the NRF_ERROR_INVALID_STATE event. If the device manager is suppose to manage bonds, how come the CCCD value is set back to 0 on my module?

[Pål Håland]

Have you tried reading the CCCD value manually from the control panel? If you disconnect and connect it does not automatically read back all the values again. If you call the sd_ble_gatts_sys_attr_set, then you need to provide the values you received from the sd_ble_gatts_sys_attr_get when disconnecting.