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Set scan_duplicate in BLE scan params (#4126)

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This value is uninitialised and as such can be a random (and invalid) value. It's needs to be set per the espressif documentation here:

https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/bluetooth/esp_gap_ble.html#_CPPv4N21esp_ble_scan_params_t14scan_duplicateE

This PR sets it to DUPLICATE_DISABLE. Chosen as this is needed to ensure all scan data is populated in the scan callback, per this comment in the IDF:

https://github.com/espressif/esp-idf/blob/master/components/bt/host/bluedroid/stack/btm/btm_ble_gap.c#L3591

"//if scan duplicate is enabled, the adv packet without scan response is allowed to report to higher layer"

We **don't** want it to report to the higher layer (ie BLEScan.cpp) **unless** it has the active scan response.

Seems to resolve #3770 #3677 and possibly others.
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buxtronix 2020-10-01 20:45:45 +10:00 committed by GitHub
parent 80e9e42c3b
commit 4f48caca2c
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libraries/BLE/src/BLEScan.cpp
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@ -25,6 +25,7 @@ BLEScan::BLEScan() {
m_scan_params.scan_type = BLE_SCAN_TYPE_PASSIVE; // Default is a passive scan.
m_scan_params.own_addr_type = BLE_ADDR_TYPE_PUBLIC;
m_scan_params.scan_filter_policy = BLE_SCAN_FILTER_ALLOW_ALL;
m_scan_params.scan_duplicate = BLE_SCAN_DUPLICATE_DISABLE;
m_pAdvertisedDeviceCallbacks = nullptr;
m_stopped = true;
m_wantDuplicates = false;