sd_ble_gatts_hvx returns 13313 (rarely)

[Daniel Reisfeld]

Hi,

sd_ble_gatts_hvx returns 13313 in some rare cases involving the phone is far from the nrf52840.

My questions:

1. What this return code means?

2. What is the recommended way to recuperate when it happens?

3. Is there a way to avoid it?

Please advise,

Daniel

[Andy]

Daniel Reisfeld said:

1. What this return code means?

It means the system attributes are missing. You can see that in the documentation.

Daniel Reisfeld said:

2. What is the recommended way to recuperate when it happens?

Just do this:

err_code = sd_ble_gatts_hvx(conn_handle, &hvx_params);

if (err_code == BLE_ERROR_GATTS_SYS_ATTR_MISSING) {
	err_code = sd_ble_gatts_sys_attr_set(conn_handle, NULL, 0, 0);
	APP_ERROR_CHECK(err_code);
	
	// Try again
	err_code = sd_ble_gatts_hvx(conn_handle, &hvx_params);
}

Daniel Reisfeld said:

3. Is there a way to avoid it?

Set the system attributes beforehand.

[Daniel Reisfeld]

Andy,

This results in return code 8.

I haven't found relevant documentation.

Please advise,

Daniel

[Andy]

What results in error code 8 (invalid state)?

The documentation is here:

sd_ble_gatts_hvx() and sd_ble_gatts_sys_attr_set().

[WrightLin.Avnet]

Hi Andy:

Sorry to ask here, but do you have any idea about the situation that error code 8 was feedback from  sd_ble_gatts_sys_attr_set() in BLE connected event?