event form read request

RE: event form read request

Shimon_nohayo — Thu, 22 Oct 2020 08:46:03 GMT

Great, happy I could assist.

RE: event form read request

ref — Wed, 21 Oct 2020 21:31:52 GMT

Hi Shimon,

Sorry for multiple posts. I just found what the problem was. I make a mistake when I copied Vidar's example. I copied the whole example and it worked.

Thanks again for your help.

Sincerely,

Reza

RE: event form read request

ref — Wed, 21 Oct 2020 20:35:34 GMT

Hi Shimon,

Thanks for you reply. I used the following to set the security open:

add_char_params.char_props.read = 1;
add_char_params.char_props.notify = 1;
add_char_params.is_defered_read = 1;

add_char_params.cccd_write_access = SEC_OPEN;
add_char_params.read_access = SEC_OPEN;

Basically, I followed Vidar's example code (above). The example seems very simple but I get the error below:

Error when calling 'reduceApp': Cannot read property 'toUppedCase' of null

I appreciate any comment.

Thanks,

Reza

RE: event form read request

Shimon_nohayo — Mon, 19 Oct 2020 07:14:41 GMT

Hi Reza,

Sorry for the late response

In the service init did you add:

// Initialize CUS Service init structure to zero.
cus_init.evt_handler = on_cus_evt;

BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cus_init.custom_value_char_attr_md.cccd_write_perm);
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cus_init.custom_value_char_attr_md.read_perm);
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cus_init.custom_value_char_attr_md.write_perm);

err_code = ble_cus_init(&m_cus, &cus_init);
APP_ERROR_CHECK(err_code);
}

RE: event form read request

ref — Thu, 15 Oct 2020 18:51:11 GMT

Sorry Vidar , I messed the name.

RE: event form read request

ref — Thu, 15 Oct 2020 18:41:05 GMT

Hi Shimon,

I have a similar problem of getting an event for a read request. Searching for answer I ran into this post. I followed your recommendation above and modified my code based on the example you provided. Unfortunately, I didn't work out for me. As soon as I add this line: add_char_params.is_defered_read = 1; the NRF_connect freezes for a few seconds and then gives me "Gatt timeout error". If I remove this line, everything works well, except I won't get any event for my read requests. I was wondering if you have any comments.

I really appreciate any help.

Thanks,

Reza

RE: event form read request

ipshiv — Tue, 12 Mar 2019 06:44:06 GMT

Good day! Do you have an example for read event on gatt client side?

I used S130 and this code worked fine:

                    ble_uuid_t m_uuid;
    				m_uuid.type = BLE_UUID_TYPE_VENDOR_BEGIN;
    				m_uuid.uuid = LGS_UUID_TYPE_CHAR;

    				ble_gattc_handle_range_t handle_range;
    				handle_range.start_handle = 0x0001;
    				handle_range.end_handle = 0xFFFF;

    				NRF_LOG_INFO("Reading....\n");
    				ret_code_t err_code = sd_ble_gattc_char_value_by_uuid_read(m_ble_lgs_c.conn_handle,
    						&m_uuid, &handle_range);
    				APP_ERROR_CHECK(err_code);

and in ble_evt_handler

case BLE_GATTC_EVT_CHAR_VAL_BY_UUID_READ_RSP: {

		
		uint8_t * ble_data_ptr =
				p_ble_evt->evt.gattc_evt.params.char_val_by_uuid_read_rsp.handle_value->p_value;
		printf("0x%x\t", *ble_data_ptr);
		printf("0x%x\r\n", *(ble_data_ptr + 1));

	}

When I migrate to S132 this part crashes with fatal error

RE: event form read request

Shimon_nohayo — Fri, 18 Jan 2019 13:38:38 GMT

Thanks - very helpful

RE: event form read request

Vidar Berg — Fri, 18 Jan 2019 13:00:06 GMT

Hi Shimon,

Normal read requests are handled without application interaction. If you want to receive an event you need to enable authorization like you indicated (MSC). Below is a diff showing the changes needed to enable this in the ble_app_blinky_example.

devzone.nordicsemi.com/.../auth_5F00_read.diff

If anything is unclear, let me know.

Vidar