doc/Connection_Parameter.md


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42


    Contents⊕
  
  
  Direct-BT
  Default Connection Parameter
  
  Server
  Client
  
  
Direct-BT Default
Connection Parameter
Server

BTAdapter::setDefaultConnParam():

const uint16_t conn_min_interval = 8; // 10ms
const uint16_t conn_max_interval = 40; // 50ms
const uint16_t conn_latency = 0;
const uint16_t supervision_timeout = 50; // 500ms
status = adapter->setDefaultConnParam(conn_min_interval,
conn_max_interval, conn_latency, supervision_timeout);

BTAdapter::startAdvertising()

static const uint16_t adv_interval_min=160; // x0.625 = 100ms -
default is 640 -> 400ms
static const uint16_t adv_interval_max=480; // x0.625 = 300ms -
default is 640 -> 400ms
static const AD_PDU_Type adv_type=AD_PDU_Type::ADV_IND;
static const uint8_t adv_chan_map=0x07;
static const uint8_t filter_policy=0x00;
eir.setConnInterval(8, 12); // 10ms - 15ms


Client

BTAdapter::startDiscovery():

static DiscoveryPolicy discoveryPolicy =
DiscoveryPolicy::PAUSE_CONNECTED_UNTIL_READY; // default value
static bool le_scan_active = true; // default value
static const uint16_t le_scan_interval = 24; // 15ms, default
value
static const uint16_t le_scan_window = 24; // 15ms, default
value
static const uint8_t filter_policy = 0; // default value
adapter->startDiscovery( discoveryPolicy, le_scan_active,
le_scan_interval, le_scan_window, filter_policy );

BTDevice::connectLE():

static const uint16_t le_scan_interval = 24; // 15ms, default
value
static const uint16_t le_scan_window = 24; // 15ms, default
value
uint16_t conn_interval_min = (uint16_t)8; // 10ms
uint16_t conn_interval_max = (uint16_t)12; // 15ms
const uint16_t conn_latency = (uint16_t)0;
const uint16_t supervision_timeout = (uint16_t)
getHCIConnSupervisorTimeout(conn_latency, (int) ( conn_interval_max *
1.25 ) /* ms */);
device->connectLE(le_scan_interval, le_scan_window,
conn_interval_min, conn_interval_max, conn_latency,
supervision_timeout);