SCAN NAME FILTER not work when NAME has NULL(\x00) in ADV packet.

[embedholic]

Hi,

If i use SCAN_NAME_FILTER, the function nrf_ble_scan_filter_set's 3rd argument is null-terminated string.

But HM-10 send FULL NAME including null(0x00) characters and size including null chars.

"HMSoft" is delivered in ADV packet.

len = 14

type=0x09

"HMSoft\x00\x00\x00\x00"

In nordic source

FILE : ble_advdata.c

FUNCTION :ble_advdata_name_find

parsed_name_lne include null characters. So

it returns false.

Which is problem ?

a) adv packet includes null characters and length include null characters

b) nordic nrf_ble_scan_filter_set with NAME_FILLTER that treats name as null-terminated string.

Thanks..

[Sigurd]

Hi,

How are you setting the advertising name ?

Like this ?

#define DEVICE_NAME                     "HMSoft\n\n\n\n" 

If you are doing that, then set the target name like this:

static char const m_target_periph_name[] = "HMSoft\n\n\n\n";     /**< Name of the device we try to connect to. This name is searched in the scan report data*/

[embedholic]

not '\n'l but '\x00 (value 0x00)..

The HM-10 (long time best seller BLE) send name in advertising packet with null characters included.

m_target_periph_name[]  = "HMSoft\x00\x00\x00\x00"; will not work.

"HMSoft\x00\x00\x00\x00" is equal "HMSoft"

[Sigurd]

Does m_target_periph_name[]  = "HMSoft\x00\x00\x00\x00\n"; work ?

[embedholic]

It will not work. The problem is

>> nrf_ble_scan_filter_set(&m_scan, SCAN_NAME_FILTER, m_target_periph_name);

function nrf_blescan_filter_set get the name only without length of the name array.

The function can not know whether how many null characters are included in name.

Name from advertisement message has null characters and length include the null-charaters.

See below source.

the name compare not using strcmp but memcmp and length check is included.

I have changed to strcmp and it works ok now.

FIle : cble_advdata.c

Function : ble_advdata_name_find

#if 0
if ( (data_offset != 0)
&& (parsed_name_len != 0)
&& (strlen(p_target_name) == parsed_name_len)
&& (memcmp(p_target_name, p_parsed_name, parsed_name_len) == 0))
{
return true;
}
#else
if ( (data_offset != 0)
&& (parsed_name_len != 0)
// && (strlen(p_target_name) == parsed_name_len)
&& (strcmp(p_target_name, p_parsed_name) == 0))
{
return true;
}
#endif // by holic