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PRIVACY :LE Create Connection Command | Cypress Semiconductor

PRIVACY :LE Create Connection Command

Summary: 1 Reply, Latest post by VAVC on 02 Apr 2016 06:44 AM PDT
Verified Answers: 0
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amina.tahiri_1619866's picture
2 posts

I am evaluating the CY5676A PRoC BLE 256KB Module in HCI mode. I am trying to create connection by using Private Addresses.

I do before advertising with these parameters :

 @13:41:26.316 <+    13 msec> TED command
   raw = [0x01, 0x06, 0x20, 0x0F, 0xCC, 0x00, 0xCC, 0x00, 0x01, 0x02, 0x02, 0x80, 0x95, 0x19, 0x29, 0x49, 0x80, 0x07, 0x00]
   Parameter Total Length = 0xF
   Advertising_Interval_Min = 0xCC
   Advertising_Interval_Max = 0xCC
   Advertising_Type = 0x1 (ADV_DIRECT_IND)
   Own_Address_Type = 0x2 (Public Identity Address)
   Direct_Address_Type = 0x2 (Public Identity Address)
   Direct_Address = 0x804929199580
   Advertising_Channel_Map = 0x7 (ch 37|ch 38|ch 39)
   Advertising_Filter_Policy = 0x0 (Allow Scan Request from Any, Allow Connect Request from Any)
 @13:41:26.335 <+    19 msec> TED event
   raw = [0x04, 0x0E, 0x04, 0x01, 0x06, 0x20, 0x00]
   Event Code = 0xE (HCI_COMMAND_COMPLETE)
   Parameter Total Length = 0x4
   Num_HCI_Command_Packets = 0x1
   Command_Opcode = 0x2006 (HCI_LE_SET_ADVERTISING_PARAMETERS)
   Status = 0x0 (Success)  

After i do the scan with these parameters :

 @13:41:26.392 <+    10 msec> DUT command
   raw = [0x01, 0x0B, 0x20, 0x07, 0x01, 0x10, 0x00, 0x10, 0x00, 0x02, 0x00]
   Parameter Total Length = 0x7
   LE_Scan_Type = 0x1 (Active scanning)
   LE_Scan_Interval = 0x10
   LE_Scan_Window = 0x10
   Own_Address_Type = 0x2 (Public Identity Address)
   Scanning_Filter_Policy = 0x0 (Accept all advertisement packets)

but the connection complete is missing for this type of advertising?

 @13:41:26.463 <+     0 msec> DUT command
   raw = [0x01, 0x0D, 0x20, 0x19, 0x10, 0x00, 0x10, 0x00, 0x00, 0x02, 0x80, 0x95, 0x19, 0x29, 0x49, 0x80, 0x02, 0x64, 0x00, 0x64, 0x00, 0x00, 0x00, 0x80, 0x0C, 0xFF, 0xFF, 0xFF, 0xFF]
   Parameter Total Length = 0x19
   LE_Scan_Interval = 0x10
   LE_Scan_Window = 0x10
   Initiator_Filter_Policy = 0x0 (White list is not used)
   Peer_Address_Type = 0x2 (Public Identity Address)
   Peer_Address = 0x804929199580
   Own_Address_Type = 0x2 (Public Identity Address)
   Conn_Interval_Min = 0x64
   Conn_Interval_Max = 0x64
   Conn_Latency = 0x0
   Supervision_Timeout = 0xC80
   Minimum_CE_Length = 0xFFFF
   Maximum_CE_Length = 0xFFFF
 @13:41:26.479 <+    16 msec> DUT event
   raw = [0x04, 0x0F, 0x04, 0x00, 0x01, 0x0D, 0x20]
   Event Code = 0xF (HCI_COMMAND_STATUS)
   Parameter Total Length = 0x4
   Status = 0x0 (Success)
   Num_HCI_Command_Packets = 0x1
   Command_Opcode = 0x200D (HCI_LE_CREATE_CONNECTION)
 @13:41:36.480 Marker
   Type = ERROR
   Text = HCI timeout waiting for event HCI_LE_META


Is it possible to create connection with  privacy and advertising type is ADV_DIRECT_IND?

VAVC's picture
Cypress Employee
506 posts



Check these things:


1)As you are using resolvable private address with the local IRK, the address of the peripheral when advertising would be different

to 0x804929199580. 

2)On the central ise before initiating the connection request , first try to scan for the peripheral and see whether you can see any direct adv packet or not. If you are not getting there may be two issue

a) as peripheral is doing HIGH DC direct advertisement it would stop advertisement after 1.024ms. So if we start scanning /initate connection request after 1.204ms it may see the adv packet/establish the connection. 

So better start scanning first and then start direct adv to see the adv packet. in case if you don't see the adv packet , then give the address in the reverse order. i.e LSB first 

it should definitely see the adv packet.


3) IN the connection request, as you are providing the public address of the peripheral, it won't establish the connection unless the both the devices have bonded before or the central has the IRK that is used by the peripheral. 





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