Unable to print on TD-2125NWB using Bluetooth

[PrimaelQuemerais]

Hello,

I'm trying to print labels from an iPad using Bluetooth on the TD-2125NWB but consistently get a ERROR_COMMUNICATION_ERROR message. Everything works perfectly when using the same printer over WIFI.

I have also tested the Brother Print SDK demo app which works both with WIFI and Bluetooth.

Here is the code I use to connect to the printer and print a file :

List<BluetoothPrinter> printers = await Printer().getBluetoothPrinters([
  Model.TD_2120N.getName(),
  Model.TD_2125N.getName(),
  Model.TD_2125NWB.getName(),
  Model.TD_2130N.getName(),
]);

Printer printer = Printer();
PrinterInfo printInfo = PrinterInfo();
printInfo.printerModel = printers.first.model;
printInfo.printMode = PrintMode.FIT_TO_PAGE;
printInfo.isAutoCut = false;
printInfo.port =  Port.BLUETOOTH;
printInfo.macAddress = printers.first.macAddress;
printInfo.binCustomPaper = _customPaperFromModel();
printInfo.printQuality = PrintQuality.HIGH_RESOLUTION;
printInfo.rjDensity = 8;

printer.setPrinterInfo(printInfo);

PrinterStatus status = await printer.printFile(testFile.path);

Output :

flutter: Received Result: {labelType: -1, maxOfBatteryResidualQuantityLevel: -1, labelId: -1, isACConnected: {id: -1, name: Unknown}, batteryResidualQuantityLevel: -1, isBatteryMounted: {id: -1, name: Unknown}, batteryLevel: -1, errorCode: {name: ERROR_COMMUNICATION_ERROR, id: -1}}
flutter: ERROR_COMMUNICATION_ERROR

Any idea how to fix this?

[CodeMinion]

Hi @PrimaelQuemerais ,

Thanks for reaching out about this. Unfortunately I don't have any of those printers to be able to test, so could I bother you try a few things for me and let me know the result?

• When searching for the printer just include the TD-2125NWB and see if you still get the same error.
• Before printing over BT ensure that under settings in the device the printer appears as "Connected" in the Bluetooth list, if not tap it to connect.

Thanks in advance,

[PrimaelQuemerais]

Hi @CodeMinion,

I'm now getting a new error :

I/BluetoothAdapter(14631): cancelDiscovery
I/BluetoothSocket(14631): connect() for device XX:XX:XX:XX:C0:B8 called by pid: 14631
I/gralloc4(14631): register: id=4340000012c, handle:0xb40000797d060700, vaddr=0x7979752000
D/BluetoothSocket(14631): close() this: XX:XX:XX:XX:C0:B8, channel: 1, mSocketIS: android.net.LocalSocketImpl$SocketInputStream@81764ed, mSocketOS: android.net.LocalSocketImpl$SocketOutputStream@f045f22, mSocket: android.net.LocalSocket@250db3 impl:android.net.LocalSocketImpl@5658f70 fd:java.io.FileDescriptor@e9262e9, mSocketState: CONNECTED
D/BluetoothSocket(14631): close() this: XX:XX:XX:XX:C0:B8, channel: 1, mSocketIS: android.net.LocalSocketImpl$SocketInputStream@81764ed, mSocketOS: android.net.LocalSocketImpl$SocketOutputStream@f045f22, mSocket: null, mSocketState: CLOSED
D/BluetoothSocket(14631): close() this: XX:XX:XX:XX:C0:B8, channel: 1, mSocketIS: android.net.LocalSocketImpl$SocketInputStream@81764ed, mSocketOS: android.net.LocalSocketImpl$SocketOutputStream@f045f22, mSocket: null, mSocketState: CLOSED
I/flutter (14631): Received Result: {isBatteryMounted: {name: Unknown, id: -1}, labelId: 65535, maxOfBatteryResidualQuantityLevel: -1, labelType: 65535, errorCode: {name: ERROR_NOT_SAME_MODEL, id: -1}, isACConnected: {name: Unknown, id: -1}, batteryLevel: -1, batteryResidualQuantityLevel: -1}
I/flutter (14631): ERROR_NOT_SAME_MODEL

In the Android settings I paired the printer but it is unable to connect, clicking the connect button doesn't do anything, no error message either. I reckon the first time I paired the device it told me "This device requires an app to function"

Let me know if I can run more tests to help

[PrimaelQuemerais]

Okay I got it to work.

What confused me is the modelName returned by the Bluetooth search function is not the same as for Wifi, and since I used this to determine which model I'm dealing with it didn't work.

Wifi returns Brother TD-2125NWB whereas Bluetooth returns TD-2125NWB_5452

[CodeMinion]

Glad you to it to work @PrimaelQuemerais. That's correct, for some printers the Bluetooth name includes the first octect of the Bluetooth MAC of the printer.

Apologies for the confusion, the connected step was meant for iOS devices.

[PrimaelQuemerais]

Ah right I switched devices in the middle of my test, I will test again with the iPad by perhaps the issue also came from me passing the wrong model to the printer