Periodic Advertising Synchronization (sync)#

This class provides periodic advertising synchronization feature.

When this feature is used, it is recommended to enable event le_gap_extended_scan_response which contains useful information for establishing a synchronization.

sync commands#

sync_close#

This command can be used to close a synchronization with periodic advertising or cancel an ongoing synchronization establishment procedure.

Command#

Response#

• 0: success

• Non-zero: an error occurred

For other values refer to the Error codes

API#

/* Function */  
struct gecko_msg_sync_close_rsp_t *gecko_cmd_sync_close(uint8 sync);  
  
/* Response id */  
gecko_rsp_sync_close_id  
  
/* Response structure */  
struct gecko_msg_sync_close_rsp_t  
{  
  uint16 result  
}  

Events generated#

sync_open#

This command can be used to establish a synchronization with a periodic advertising from the specified advertiser and begin receiving periodic advertising packets. Note that synchronization establishment can only occur when scanning is enabled. While scanning is disabled, no attempt to synchronize will take place.

The application should decide skip and timeout values based on the periodic advertising interval provided by the advertiser. It is recommended to set skip and timeout at the values that allow a few receiving attempts. Periodic advertising intervals are reported in event le_gap_extended_scan_response.

Command#

• Range: 0x06 to 0xFFFF

• Unit: 10 ms

• Time range: 100 ms ms to 163.84 s

9-14 | bd_addr | address | Address of the advertiser
15 | uint8 | address_type | Advertiser address type. Values:

• 0: Public address

• 1: Random address

Response#

• 0: success

• Non-zero: an error occurred

For other values refer to the Error codes
6 | uint8 | sync | Handle that will be assigned to the periodic advertising synchronization once the synchronization will be established. This handle is valid only if the result code of this response is 0 (zero).

API#

/* Function */  
struct gecko_msg_sync_open_rsp_t *gecko_cmd_sync_open(uint8 adv_sid, uint16 skip, uint16 timeout, bd_addr address, uint8 address_type);  
  
/* Response id */  
gecko_rsp_sync_open_id  
  
/* Response structure */  
struct gecko_msg_sync_open_rsp_t  
{  
  uint16 result,  
  uint8 sync  
}  

Events generated#

sync events#

sync_opened#

This event indicates a synchronization has been opened.

Event#

• 0: Public address

• 1: Random address

13 | uint8 | adv_phy | The advertiser PHY. Value:

• 1: LE 1M PHY

• 2: LE 2M PHY

• 4: LE Coded PHY

14-15 | uint16 | adv_interval | The periodic advertising interval. Value in units of 1.25 ms

• Range: 0x06 to 0xFFFF

• Time range: 7.5 ms to 81.92 s

16-17 | uint16 | clock_accuracy | The advertiser clock accuracy.

API#

/* event id*/  
gecko_evt_sync_opened_id  
  
/* event structure*/  
struct gecko_msg_sync_opened_evt_t  
{  
  uint8 sync,  
  uint8 adv_sid,  
  bd_addr address,  
  uint8 address_type,  
  uint8 adv_phy,  
  uint16 adv_interval,  
  uint16 clock_accuracy  
}  

sync_closed#

This event indicates sync lost or a sync establishment procedure was cancelled.

Event#

• 0: success

• Non-zero: an error occurred

For other values refer to the Error codes
6 | uint8 | sync | Periodic advertising synchronization handle

API#

/* event id*/  
gecko_evt_sync_closed_id  
  
/* event structure*/  
struct gecko_msg_sync_closed_evt_t  
{  
  uint16 reason,  
  uint8 sync  
}  

sync_data#

This event reports a received periodic advertising packet.

Event#

• Valid value range: -127 to 126

• Value 127: information unavailable

6 | int8 | rssi | Signal strength indicator (RSSI) in the latest received packet. Units: dBm

• Range: -127 to +20

7 | uint8 | data_status | Data completeness:

• 0: Data complete

• 2: Data incomplete, data truncated, no more to come

8 | uint8array | data | Periodic ddvertising data

API#

/* event id*/  
gecko_evt_sync_data_id  
  
/* event structure*/  
struct gecko_msg_sync_data_evt_t  
{  
  uint8 sync,  
  int8 tx_power,  
  int8 rssi,  
  uint8 data_status,  
  uint8array data  
}  

sync enumerations#

sync_advertiser_clock_accuracy#

These values indicate what is the advertiser clock accuracy in a periodic advertising synchronization.

Enumerations#