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Add device UUID prefix to BLE scan response and filter in scan callback
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ESP32 server: include 4-byte device UUID prefix as manufacturer data
(company 0xFFFF) in BLE scan response, allowing pre-connection filtering.

Android: check manufacturer data in ScanCallback.onScanResult before
connecting. Skips devices with non-matching UUID prefix, preventing
wasted connections to wrong SylDa devices. Backward compatible with
old firmware (proceeds if no manufacturer data present).
This commit is contained in:
eddy 2026-08-03 23:30:35 +02:00
commit 3cd4a6211d
3 changed files with 67 additions and 56 deletions
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8
src/main.cpp
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@ -445,10 +445,16 @@ void setup() {
NimBLEAdvertising *pAdvertising = NimBLEDevice::getAdvertising();
pAdvertising->setName("SylDa_Server");
pAdvertising->addServiceUUID(SERVICE_UUID);
NimBLEAdvertisementData scanResp;
scanResp.setCompleteServices(NimBLEUUID(SERVICE_UUID));
uint8_t mfgPayload[6];
mfgPayload[0] = 0xFF;
mfgPayload[1] = 0xFF;
memcpy(mfgPayload + 2, deviceUuid, 4);
scanResp.setManufacturerData(std::string((char*)mfgPayload, 6));
pAdvertising->setScanResponseData(scanResp);
pAdvertising->enableScanResponse(true);