Using Flutter to connect and write to Bluetooth Devices

Question

I'm new with Flutter and am just trying to make this work.

Am using Flutter Blue https://pub.dartlang.org/packages/flutter_blue

It connects though, just this issue when writing.

But when writing i'm receiving this message. Not sure what I am doing wrong though.

here's my code..

onPressed: () {
                  print("HEY write pressed");
                  var fff1 = new Guid("0000fff1-0000-1000-8000-00805f9b34fb");
                  var fffa = new Guid("0000fffa-0000-1000-8000-00805f9b34fb");
                  BluetoothCharacteristic characteristic = new BluetoothCharacteristic(uuid: fffa, serviceUuid: fff1, descriptors: null, properties: null);
                  _writeCharacteristic(characteristic);
               },

PlatformException(locateCharacteristic, service could not be located on the device, null)

I've tried following this post. Flutter Blue Read characteristic UUID

In production I would probably save the UUID as variables, but the effect should be similar..

If anyone has any guidance or tips that would be super welcome.

Taym95 · Accepted Answer · 2019-05-28 13:48:48Z

1

Your code is right but the device you want to connect to doesnt contain this service :var fff1 = new Guid("0000fff1-0000-1000-8000-00805f9b34fb");

Check which services exist in the device you want to connect to.

answered May 28, 2019 at 13:48

Taym95

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1 Comment

Kamil Over a year ago

No it is not a reason. flutter_blue has not the best exception handling. I have same problem with service taken from device, its weird because when i got chars with id f.e. 0x0 one second later my app tells that there is no this char on device.

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