c# - Bluetooth Low Energy connection parameters update - device or windows causing HRESULT: 0x80070005 (E_ACCESSDENIED))? -

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i'm trying write gap service (0x180) characteristics , 0x2a04

whenever try writing 0x2a04 (connection parameters) or 0x0200 (device name), 

    var devices = await windows.devices.enumeration.deviceinformation.findallasync(gattdeviceservice.getdeviceselectorfromshortid(0x1800));     var service = await gattdeviceservice.fromidasync(devices[0].id);      var gapdata = service.getcharacteristics(new guid("00002a04-0000-1000-8000-00805f9b34fb"))[0];     var raw = await gapdata.readvalueasync();      byte[] conparas = new byte[raw.value.length];     datareader.frombuffer(raw.value).readbytes(conparas);     //i can breakpoint , verify read works fine      var status = await gapdata.writevalueasync(conparas.asbuffer());

and call writevalueasync(), program breaks on line , exception is

an exception of type 'system.unauthorizedaccessexception' occurred in mscorlib.dll not handled in user code

additional information: access denied. (exception hresult: 0x80070005 (e_accessdenied))

i'm not quite sure level of stack parameters being refused - don't know if parameters reaching ble device. however, can write other gatt services , read gap characteristics, believe device.

can see fool proof method discover problem coming from?

thanks thomas

i had problem before. seems microsoft doesn't writing gap.

i recommend structure gatt.xml contains "name" , "appearance" services in gap (only these 2 services) , put remaining characteristics underneath custom service or standard one.

if try writing characteristic write enabled beneath custom service should work.

summary: can't write characteristics under gap.

reference: restructuring gatt.xml of device fixed same problem me.

additional details: these "access denied" errors want check that: 1) have package manifest capabilities manually edited include services gatt.xml has. have specify custom services , standard services alike. 2) gatt.xml correctly structured. 3) caracteristic trying write exists/the device paired to.

cheers, togepi


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