Fix for missed scan response data (BLEScan). #4358
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This is a fix for missing scan responses after a first successfull scan. While running the BLE_scan.ino sketch with wantDuplicates=false, i got only one result with correct advertising and scan response length (31,26): pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks(), false); pBLEScan->start(scanTime, false); ... [W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 26, addr type: 1 All following calls to start() just returned the advertising data without scan response data: pBLEScan->start(scanTime, false); [W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 0, addr type: 1 With "wantDuplicates=true" i got: pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks(), true); pBLEScan->start(scanTime, false); [W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 26, addr type: 1 [W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 26, addr type: 1 [W][BLEScan.cpp:73] handleGAPEvent(): ESP_GAP_SEARCH_INQ_CMPL_EVT Devices found: 1 Scan done! pBLEScan->start(scanTime, false); [W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 0, addr type: 1 [W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 0 + 26, addr type: 1 [W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 0, addr type: 1 [W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 0 + 26, addr type: 1 Explicitly initializing m_scan_params.scan_duplicate of BLEScan solves this issue (In my case the un-initialized value was m_scan_params.scan_duplicate == 1073599044).
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This is a fix for missing scan responses after a first successfull scan.
While running the BLE_scan.ino sketch with wantDuplicates=false, i got
only one result with correct advertising and scan response length (31,26):
pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks(), false);
pBLEScan->start(scanTime, false);
...
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 26, addr type: 1
All following calls to start() just returned the advertising data without
scan response data:
pBLEScan->start(scanTime, false);
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 0, addr type: 1
With "wantDuplicates=true" i got:
pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks(), true);
pBLEScan->start(scanTime, false);
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 26, addr type: 1
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 26, addr type: 1
[W][BLEScan.cpp:73] handleGAPEvent(): ESP_GAP_SEARCH_INQ_CMPL_EVT
Devices found: 1
Scan done!
pBLEScan->start(scanTime, false);
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 0, addr type: 1
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 0 + 26, addr type: 1
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 0, addr type: 1
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 0 + 26, addr type: 1
Explicitly initializing m_scan_params.scan_duplicate of BLEScan solves
this issue (In my case the un-initialized value was
m_scan_params.scan_duplicate == 1073599044).