ERROR_INVALID_PARAM error while trying to add characteristics

[Ranajyoti Chakraborti]

Hi I have this piece of code which works in SDK 12 but when I port it to SDK 15 the sd_ble_gatts_characteristic_add function would fail with an error code of 7. No change seems to be working. Any help is appreciated,.

uint32_t                    err_code;
	ble_gatts_char_md_t 		char_md;
	ble_gatts_attr_md_t 		cccd_md;
	ble_gatts_attr_t    		attr_char_value;
	ble_uuid_t          		char_uuid;
	ble_gatts_attr_md_t 		attr_md;

	NRF_LOG_INFO("Resetting Characteristics security\r\n")
	memset(&cccd_md, 0, sizeof(ble_gatts_char_md_t));

	cccd_md.vloc = BLE_GATTS_VLOC_STACK;
	/*
	 * The access must be open for both read and write for
	 * the Client Characteristic Configuration descriptor
	 */
	BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
	BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm);

	NRF_LOG_INFO("Resetting Characteristics\r\n")
	memset(&char_md, 0, sizeof(ble_gatts_char_md_t));

	char_md.char_props.read   = 1;
	char_md.char_props.notify = 1;
	char_md.char_props.write = 1;
	char_md.p_char_user_desc  = NULL;
	char_md.p_char_pf         = NULL;
	char_md.p_user_desc_md    = NULL;
	char_md.p_cccd_md         = &cccd_md;
	char_md.p_sccd_md         = NULL;

	char_uuid.uuid = UUID_CHAR_0_0;
	char_uuid.type = p_service->uuid_type;

	NRF_LOG_INFO("Resetting Attribute\r\n")
	memset(&attr_md, 0, sizeof(ble_gatts_attr_md_t));

	BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
	BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);

	attr_md.vloc    = BLE_GATTS_VLOC_USER;

	NRF_LOG_INFO("Resetting value\r\n")
	memset(&attr_char_value, 0, sizeof(ble_gatts_attr_t));

	attr_char_value.p_uuid    = &char_uuid;
	attr_char_value.p_attr_md = &attr_md;
	attr_char_value.init_len  = MAX_CHANNELS * SAMPLES_IN_BUFFER;
	attr_char_value.init_offs = 0;
	attr_char_value.max_len   = MAX_CHANNELS * SAMPLES_IN_BUFFER;
	attr_char_value.p_value   = m_char_buf;

	NRF_LOG_INFO("Adding new characteristics\r\n")
	err_code = sd_ble_gatts_characteristic_add(p_service->service_handle,
											   &char_md,
											   &attr_char_value,
											   &p_service->char_handles);
	APP_ERROR_CHECK(err_code);
	NRF_LOG_INFO("Added new characteristics\r\n");

[Marjeris Romero]

Hi,

ERROR_INVALID_PARAM means that you have supply some invalid parameter(s) to the sd_ble_gatts_characteristic_add function. The service handle, Vendor Specific UUIDs, lengths, and permissions need to adhere to the constraints. Try to debug your project and check if these parameters all meet the constrains for sd_ble_gatts_characteristic_add.

You should also read the migration guides in the infocenter to migrate from SDK12 to SDK13, from SDK13 to SDK14, and from SDK14 to SDK15, when migrating a project from SDK12 to SDK15. But maybe the easiest way will be to try to start from scratch following a guide for adding characteristics in SDK15.

If you want you can also upload your project so I can take a look at it, since I cannot see anything wrong in the code snippet you attached above.

Best Regards,

Marjeris

[Ranajyoti Chakraborti]

Hi msromero

Very sorry for the confusion. Finally figured out the issue. I was calling the add characteristics function after the ble_dis_init. So softdevice was trying to add the characteristics to DIS. Moved the call before that and works like a charm. Sorry for the stupidity. Please close the issue if it is needed and thanks as always.

[Marjeris Romero]

Hi Ranajyoti,

Nice to hear that the problem is fixed. And don't worry, we are here to help

Ranajyoti Chakraborti said:

I can send you the project but cannot upload the project in public domain. So is there a way to upload the project?

If you have any more questions and want to upload a project some other time so we can review it and give you guidance you can do that by marking a question as a "private support ticket".

Happy to help and hope you have a nice day.

Best Regards,

Marjeris