optionalManufacturerData property
A list of manufacturer codes that a device may or may not have.
NOTE:* You NEED to define a manufacturer's code in either the filters or optionalManufacturerData if you want to be able to get its data.
NOTE: Some manufacturer data is on a block list, and is thus not available. The complete blocklist can be found here: https://github.com/WebBluetoothCG/registries/blob/master/manufacturer_data_blocklist.txt
Implementation
external List<int> get optionalManufacturerData;