`write(withResponse: true)` does not return response

[mikolak]

write[Characteristic](withResponse: true) does not return response, which should be passed as value from the native clients.

Proposal: separate write into writeWithResponse and writeWithoutResponse, make writeWithResponse return CharacteristicWithResponse or `Uint8List.

[jobfeikens]

Isn't this intended behavior? WriteWithResponse means the peripheral sends back an ack (0x13) after writing to make sure the write request worked.

[mikolak]

Server might return a different response which would be swallowed.