Advertise fast for at least 30 secs then slow down
On power up, advertise aggressively for at least 30 seconds then switch to a longer interval to conserve battery life. This fast/slow pattern is designed to balance connection response time and battery life. When a disconnect event is received restart the fast/slow pattern. When a failed connect event is received, restart the fast/slow pattern. When the screen is activated and ble is not connected, restart the fast/slow pattern. This pattern is consistent with Apple's BLE developer standards (QA 1931).
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@ -122,6 +122,15 @@ void NimbleController::StartAdvertising() {
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adv_params.conn_mode = BLE_GAP_CONN_MODE_UND;
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adv_params.disc_mode = BLE_GAP_DISC_MODE_GEN;
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/* fast advertise for 30 sec */
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if (fastAdvCount < 15) {
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adv_params.itvl_min = 32;
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adv_params.itvl_max = 47;
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fastAdvCount++;
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} else {
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adv_params.itvl_min = 1636;
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adv_params.itvl_max = 1651;
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}
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fields.flags = BLE_HS_ADV_F_DISC_GEN | BLE_HS_ADV_F_BREDR_UNSUP;
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fields.uuids128 = &dfuServiceUuid;
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@ -139,7 +148,7 @@ void NimbleController::StartAdvertising() {
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rc = ble_gap_adv_rsp_set_fields(&rsp_fields);
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ASSERT(rc == 0);
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rc = ble_gap_adv_start(addrType, NULL, 5000, &adv_params, GAPEventCallback, this);
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rc = ble_gap_adv_start(addrType, NULL, 2000, &adv_params, GAPEventCallback, this);
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ASSERT(rc == 0);
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}
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@ -163,6 +172,7 @@ int NimbleController::OnGAPEvent(ble_gap_event* event) {
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alertNotificationClient.Reset();
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connectionHandle = BLE_HS_CONN_HANDLE_NONE;
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bleController.Disconnect();
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fastAdvCount = 0;
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StartAdvertising();
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} else {
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connectionHandle = event->connect.conn_handle;
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@ -181,6 +191,7 @@ int NimbleController::OnGAPEvent(ble_gap_event* event) {
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alertNotificationClient.Reset();
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connectionHandle = BLE_HS_CONN_HANDLE_NONE;
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bleController.Disconnect();
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fastAdvCount = 0;
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StartAdvertising();
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break;
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@ -72,6 +72,10 @@ namespace Pinetime {
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uint16_t connHandle();
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void NotifyBatteryLevel(uint8_t level);
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void RestartFastAdv() {
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fastAdvCount = 0;
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}
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private:
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static constexpr const char* deviceName = "InfiniTime";
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Pinetime::System::SystemTask& systemTask;
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@ -94,6 +98,7 @@ namespace Pinetime {
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uint8_t addrType; // 1 = Random, 0 = PUBLIC
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uint16_t connectionHandle = BLE_HS_CONN_HANDLE_NONE;
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uint8_t fastAdvCount = 0;
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ble_uuid128_t dfuServiceUuid {
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.u {.type = BLE_UUID_TYPE_128},
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@ -233,6 +233,9 @@ void SystemTask::Work() {
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displayApp.PushMessage(Pinetime::Applications::Display::Messages::UpdateBatteryLevel);
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heartRateApp.PushMessage(Pinetime::Applications::HeartRateTask::Messages::WakeUp);
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if (!bleController.IsConnected())
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nimbleController.RestartFastAdv();
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isSleeping = false;
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isWakingUp = false;
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isDimmed = false;
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