[Help]: Can't print even when char write is true

[shayant98]

Requirements

• [X] I've looked at the README 'Common Problems' section

Have you checked this problem on the example app?

Yes

FlutterBluePlus Version

1.32.4

Flutter Version

3.19.5

What OS?

Android

OS Version

14

Bluetooth Module

Zebra ZD621

What is your problem?

tried printing but keep getting

FlutterBluePlusException | writeCharacteristic | android-code: 3 | GATT_WRITE_NOT_PERMITTED

I hope someone can help me

Logs

I/flutter (29906):  Printer2Service | sendZPLCommands - Service: BluetoothService{remoteId: 00:07:4D:E4:DD:E2, serviceUuid: 1800, isPrimary: true, characteristics: [BluetoothCharacteristic{remoteId: 00:07:4D:E4:DD:E2, serviceUuid: 1800, secondaryServiceUuid: null, characteristicUuid: 2a00, descriptors: [], properties: CharacteristicProperties{broadcast: false, read: true, writeWithoutResponse: false, write: true, notify: false, indicate: false, authenticatedSignedWrites: false, extendedProperties: false, notifyEncryptionRequired: false, indicateEncryptionRequired: false}, value: []}, BluetoothCharacteristic{remoteId: 00:07:4D:E4:DD:E2, serviceUuid: 1800, secondaryServiceUuid: null, characteristicUuid: 2a01, descriptors: [], properties: CharacteristicProperties{broadcast: false, read: true, writeWithoutRespon
I/flutter (29906): se: false, write: true, notify: false, indicate: false, authenticatedSignedWrites: false, extendedProperties: false, notifyEncryptionRequired: false, indicateEncryptionRequired: false}, value: []}, BluetoothCharacteristic{remoteId: 00:07:4D:E4:DD:E2, serviceUuid: 1800, secondaryServiceUuid: null, characteristicUuid: 2a04, descriptors: [], properties: CharacteristicProperties{broadcast: false, read: true, writeWithoutResponse: false, write: false, notify: false, indicate: false, authenticatedSignedWrites: false, extendedProperties: false, notifyEncryptionRequired: false, indicateEncryptionRequired: false}, value: []}, BluetoothCharacteristic{remoteId: 00:07:4D:E4:DD:E2, serviceUuid: 1800, secondaryServiceUuid: null, characteristicUuid: 2aa6, descriptors: [], properties: CharacteristicProper
I/flutter (29906): ties{broadcast: false, read: true, writeWithoutResponse: false, write: false, notify: false, indicate: false, authenticatedSignedWrites: false, extendedProperties: false, notifyEncryptionRequired: false, indicateEncryptionRequired: false}, value: []}], includedServices: []}
D/[FBP-Android](29906): [FBP] onMethodCall: writeCharacteristic
E/[FBP-Android](29906): [FBP] onCharacteristicWrite:
E/[FBP-Android](29906): [FBP]   chr: 2a00
E/[FBP-Android](29906): [FBP]   status: GATT_WRITE_NOT_PERMITTED (3)
E/flutter (29906): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: FlutterBluePlusException | writeCharacteristic | android-code: 3 | GATT_WRITE_NOT_PERMITTED
E/flutter (29906): #0      BluetoothCharacteristic.write (package:flutter_blue_plus/src/bluetooth_characteristic.dart:216:9)
E/flutter (29906): <asynchronous suspension>
E/flutter (29906): #1      Printer2Service.sendZPLCommands (package:wms/services/printer2_service.dart:54:11)
E/flutter (29906): <asynchronous suspension>
E/flutter (29906): 

[chipweinberger]

this error code is returned by your ble device, not FBP. there is nothing we can do.

char.properties.write is not a guarantee. it's reported by the device and the device can lie.