B4A Library SD EscPos Printer (Lan,USB, Bluetooth SPP, BLE)

Star-Dust · Aug 23, 2022

This library allows you to print with thermal printers compatible with the ESC POS language in 4 different communication channels (USB, Bluetooth SPP, BLE, LAN)
you can download the ble3 library from here

The DEMO version prints one minute every 2. The full version of the library will be issued to those making a donation (Contact me in private before making a donation)

WARNING: Make sure the library meets all your needs, is compatible with the printer you need to use.

For ESC/POS B4J version see Here
For ESC/POS B4i version see Here
For ZEBRA printer see Here

Those who want a different version, such as LAN, USB, NFC please contact me privately.

OS	Bluetooth SPP	BLE (Beacon)	USB	LAN / WIFI	RS 232	NFC
Android	x	x	x	x
iOs		x		x (on request)
Window	x		x (on request)	x (on request)

To print a PDF with ESC/POS see

[B4X] [B4Xpages] PDF to Image (B4XBitmap)

I often needed to turn a PDF into an image, most of the time to have it printed on a thermal printer. I was looking for simple and cross-platform methods. This is an example that allows you to get an image with Windows / Android / iOs from a PDF file NB. For Windows it is necessary to...

www.b4x.com

SD_EscPosPrinter

Author: Star-Dust
Version: 1.09

BLE_Printer
- Events:
  - BLEoff
  - Connected (services As List)
  - Disconnected
  - ImageWriteComplete
  - PrinterFound (Name As String, ID As String)
  - StateChanged (msg As String)
  - WriteComplete (Characteristic As String, Success As Boolean)
- Fields:
  - CharatteristicName As String
  - Charset As String
  - currentState As Int
  - ServiceName As String
- Functions:
  - AddTab (ArrayTab As Int()) As String
    Add Tab
    eg. PrinterBLE.AddTab(Array As Byte(100,150,121))
  - Beep (Times As Byte, SecondsDurate As Byte) As String
    .Printer.Beep(1..9,1..9)
  - CenterJustify As String
    after this command calls SendBufferToPrinter
  - Class_Globals As String
  - Connect (ID As String) As String
  - Disconnect As String
  - Initialize (CallBack As Object, EventName As String) As String
    Initializes the object. You can add parameters to this method if needed.
  - InitializePrinter As String
  - IsInitialized As Boolean
    Verifica se l'oggetto sia stato inizializzato.
  - LeftJustify As String
    after this command calls SendBufferToPrinter
  - PrintBitmap (bmp As Bitmap)
  - RightJustify As String
    after this command calls SendBufferToPrinter
  - ScanPrinter As String
  - SetCodePage (Code As Byte) As String
    es. Printer.SetCodePage(06) for umlauts char
  - Write (Text As String) As String
    Write (Print) a Text
  - Write_ArrayByte (B As Byte()) As String
    Write (Send to Printer) a Array of Byte
    eg. PrinterBLE.Write_ArrayByte(Array As Byte(0x1D,150,23))
    eg. PrinterBLE.Write_ArrayByte("Text".GetBytes("UTF8"))
  - WriteBarCode (Code As String) As String
  - WriteBarCode2D (Code As String) As String
  - WriteLine (Text As String) As String
    Write (Print) a Text + CHLF
  - WriteList (list As List) As String
    Write (Print) a List
- Properties:
  - CodeTable
    es. printer.setCodeTable(Encoding.Code_WPC1252)
    aftet this command calls SendBufferToPrinter
  - isConnect As Boolean [read only]
  - isScanning As Boolean [read only]
  - Spacing
    after setSpacing command calls SendBufferToPrinter
BT_Printer
Note: AddPermission(android.permission.ACCESS_COARSE_LOCATION)
- Events:
  - BluetoothIsDisabled
  - ConnectedToPrint (Success As Boolean)
  - DataReceived (Buffer() As Byte)
  - DisconnectToPrint (Mac As String)
  - DiscoveryComplete (Printers As Map)
  - DiscoveryFinished
  - DiscoveryNewPrinter (PrintedFound As Map, DeviceClass As Int)
  - DiscoveryNoDeviceFound
  - ErrorDiscovery
  - ListPrinterAssociated (ListNameAndMac As Map)
  - SendingError (Mac As String)
  - SendTerminated
- Fields:
  - Charset As String
  - Const_AUDIO_VIDEO As Int
  - Const_COMPUTER As Int
  - Const_HEALTH As Int
  - Const_IMAGING As Int
  - Const_MISC As Int
  - Const_NETWORKING As Int
  - Const_PERIPHERAL As Int
  - Const_PHONE As Int
  - Const_TOY As Int
  - Const_UNCATEGORIZED As Int
  - Const_WEARABLE As Int
- Functions:
  - AddBuffer_ArrayByte (B As Byte()) As String
  - AddBuffer_BarCode (Code As String) As String
  - AddBuffer_BarCode2D (Code As String) As String
  - AddBuffer_Bitmap (Bmp As Bitmap, ShiftLeft As Int) As String
  - AddBuffer_BitmapAlternativeCoding (Bmp As Bitmap) As String
  - AddBuffer_List_Write (list As List) As String
  - AddBuffer_List_WriteLine (list As List) As String
  - AddBuffer_Tab (ArrayTab As Int()) As String
  - AddBuffer_Write (Text As String) As String
  - AddBuffer_WriteLine (Text As String) As String
  - AddPrintDefineImage As String
  - Beep (Times As Byte, SecondsDurate As Byte) As String
    .Printer.Beep(1..9,1..9)
  - CenterJustify As String
    after this command calls SendBufferToPrinter
  - Class_Globals As String
  - ClearBuffer As String
  - Connected As Boolean
  - ConnectFromMac (Mac As String) As String
  - DefineImage (Image As Bitmap)
  - Disconnect As String
  - flushAllAndClose
  - Initialize (CallBack As Object, EventName As String) As String
    Initializes the object. You can add parameters to this method if needed.
  - InitializePrinter As String
  - IsInitialized As Boolean
    Verifica se l'oggetto sia stato inizializzato.
  - LeftJustify As String
    after this command calls SendBufferToPrinter
  - Preview As Bitmap
  - ResetPreViewWidth (NewWidth As Int) As String
  - RightJustify As String
    after this command calls SendBufferToPrinter
  - SearchFromAssociatedPrinter As String
  - SearchNewPrinter As String
    select --------------------------------------------
  - SendBufferToPrinter
  - SetCodePage (Code As Byte) As String
    es. Printer.SetCodePage(06) for umlauts char
  - WriteBarCode (Code As String) As String
    send to print immediately, do not preview - Not available in the demo version
  - WriteBarCode2D (Code As String) As String
    send to print immediately, do not preview - Not available in the demo version
  - WriteBitmap (Bmp As Bitmap) As String
    send to print immediately, do not preview - Not available in the demo version
  - WriteByte (Data As Byte()) As String
    send to print immediately, do not preview - Not available in the demo version
  - WriteText (Text As String) As String
    send to print immediately, do not preview - Not available in the demo version
- Properties:
  - CodeTable
    es. printer.setCodeTable(Encoding.Code_WPC1252)
    aftet this command calls SendBufferToPrinter
  - Spacing
    after setSpacing command calls SendBufferToPrinter
ESC_POS
Code module
Subs in this code module will be accessible from all modules.
- Fields:
  - BoldOff As String
  - BoldOn As String
  - cn_PDF417 As String
  - cn_QRcode As String
  - CutPaper As String
  - CutPartialPaper As String
  - CutTotalPaper As String
  - Demo As Boolean
  - DoubleOff As String
  - DoubleOn As String
  - FontA_Bold As String
  - FontA_DoubleHight As String
  - FontA_DoubleWide As String
  - FontA_DoubleWideHeight As String
  - FontA_Normal As String
  - FontB_Bold As String
  - FontB_DoubleHeight As String
  - FontB_DoubleWide As String
  - FontB_DoubleWideHeight As String
  - FontB_Normal As String
  - Horizzontal As String
  - InitializePrinter As String
  - ItalicFontOff As String
  - ItalicFontOn As String
  - NoUnderline As String
  - QueryErrorCauses As String
  - QueryOfflineCauses As String
  - QueryPaperStatus As String
  - QueryPrinterStatus As String
  - Underline1 As String
  - Underline2 As String
  - Vertical As String
- Functions:
  - feed (lines As Int) As String
  - Process_Globals As String
Encoding
Code module
Subs in this code module will be accessible from all modules.
- Fields:
  - CharSet_Chinese As String
  - CharSet_ChineseS As String
  - CharSet_DOS_Latin_1 As String
  - CharSet_IBM_PC As String
  - CharSet_ISO8859 As String
  - CharSet_UTF8 As String
  - CharSet_Windows1252 As String
  - Code_PC437 As Int
  - Code_PC850 As Int
  - Code_PC857 As Int
  - Code_PC858 As Int
  - Code_PC860 As Int
  - Code_PC863 As Int
  - Code_PC865 As Int
  - Code_PC866 As Int
  - Code_WPC1252 As Int
- Functions:
  - Process_Globals As String
LAN_Printer
- Events:
  - Connected (Success As Boolean)
  - DataReceived (Data() As Byte)
  - Diconnected
  - ErrorTrasmission
- Fields:
  - Charset As String
- Functions:
  - AddTab (ArrayTab As Int()) As String
    Add Tab
    eg. PrinterBLE.AddTab(Array As Byte(100,150,121))
  - Beep (Times As Byte, SecondsDurate As Byte) As String
    .Printer.Beep(1..9,1..9)
  - CenterJustify As String
    after this command calls SendBufferToPrinter
  - Class_Globals As String
  - Connect (Host As String, Port As Int) As String
  - Disconnect As String
  - Initialize (CallBack As Object, EventName As String) As String
    Initializes the object. You can add parameters to this method if needed.
  - InitializePrinter As String
  - IsInitialized As Boolean
    Verifica se l'oggetto sia stato inizializzato.
  - LanConnection_Connected (Successful As Boolean) As String
  - LeftJustify As String
    after this command calls SendBufferToPrinter
  - PrintBitmap (bmp As Bitmap) As String
  - RightJustify As String
    after this command calls SendBufferToPrinter
  - SetCodePage (Code As Byte) As String
    es. Printer.SetCodePage(06) for umlauts char
  - Write (Text As String) As String
    Write (Print) a Text
  - Write_ArrayByte (B As Byte()) As String
    Write (Send to Printer) a Array of Byte
    eg. PrinterBLE.Write_ArrayByte(Array As Byte(0x1D,150,23))
    eg. PrinterBLE.Write_ArrayByte("Text".GetBytes("UTF8"))
  - WriteBarCode (Code As String) As String
  - WriteBarCode2D (Code As String) As String
  - WriteLine (Text As String) As String
    Write (Print) a Text + CHLF
  - WriteList (list As List) As String
    Write (Print) a List
- Properties:
  - CodeTable
    es. printer.setCodeTable(Encoding.Code_WPC1252)
    aftet this command calls SendBufferToPrinter
  - Spacing
    after setSpacing command calls SendBufferToPrinter
RS_Printer
- Fields:
  - Charset As String
- Functions:
  - AddTab (ArrayTab As Int()) As String
    Add Tab
    eg. PrinterBLE.AddTab(Array As Byte(100,150,121))
  - Beep (Times As Byte, SecondsDurate As Byte) As String
    .Printer.Beep(1..9,1..9)
  - CenterJustify As String
    after this command calls SendBufferToPrinter
  - Class_Globals As String
  - Connect (SerialDevOutput As String) As String
    es. Connect("/dev/ttyAMA1")
    es. Connect("/dev/ttyS0")
  - Disconnect As String
  - Initialize (CallBack As Object, EventName As String) As String
    Initializes the object. You can add parameters to this method if needed.
  - InitializePrinter As String
  - IsInitialized As Boolean
    Verifica se l'oggetto sia stato inizializzato.
  - LeftJustify As String
    after this command calls SendBufferToPrinter
  - PrintBitmap (bmp As Bitmap) As String
  - RightJustify As String
    after this command calls SendBufferToPrinter
  - SetCodePage (Code As Byte) As String
    es. Printer.SetCodePage(06) for umlauts char
  - Write (Text As String) As String
    Write (Print) a Text
  - Write_ArrayByte (B As Byte()) As String
    Write (Send to Printer) a Array of Byte
    eg. PrinterBLE.Write_ArrayByte(Array As Byte(0x1D,150,23))
    eg. PrinterBLE.Write_ArrayByte("Text".GetBytes("UTF8"))
  - WriteBarCode (Code As String) As String
  - WriteBarCode2D (Code As String) As String
  - WriteLine (Text As String) As String
    Write (Print) a Text + CHLF
  - WriteList (list As List) As String
    Write (Print) a List
- Properties:
  - CodeTable
    es. printer.setCodeTable(Encoding.Code_WPC1252)
    aftet this command calls SendBufferToPrinter
  - Spacing
    after setSpacing command calls SendBufferToPrinter
USB_Printer
- Events:
  - WriteComplete
- Fields:
  - Charset As String
- Functions:
  - AddTab (ArrayTab As Int()) As String
    Add Tab
    eg. PrinterBLE.AddTab(Array As Byte(100,150,121))
  - Beep (Times As Byte, SecondsDurate As Byte) As String
    .Printer.Beep(1..9,1..9)
  - CenterJustify As String
    after this command calls SendBufferToPrinter
  - Class_Globals As String
  - CloseConnection As String
  - FindAdbDevice As Boolean
  - HasPermission As Boolean
  - Initialize (CallBack As Object, EventName As String) As String
    Initializes the object. You can add parameters to this method if needed.
  - InitializePrinter As String
  - IsInitialized As Boolean
    Verifica se l'oggetto sia stato inizializzato.
  - LeftJustify As String
    after this command calls SendBufferToPrinter
  - OpenConnection As String
  - PrintBitmap (bmp As Bitmap) As String
  - RequestPermission As String
  - RightJustify As String
    after this command calls SendBufferToPrinter
  - SetCodePage (Code As Byte) As String
    es. Printer.SetCodePage(06) for umlauts char
  - Write (Text As String) As String
    Write (Print) a Text
  - Write_ArrayByte (D As Byte()) As String
    Write (Send to Printer) a Array of Byte
    eg. PrinterBLE.Write_ArrayByte(Array As Byte(0x1D,150,23))
    eg. PrinterBLE.Write_ArrayByte("Text".GetBytes("UTF8"))
  - WriteBarCode (Code As String) As String
  - WriteBarCode2D (Code As String) As String
  - WriteLine (Text As String) As String
    Write (Print) a Text + CHLF
  - WriteList (list As List) As String
    Write (Print) a List
- Properties:
  - CodeTable
    es. printer.setCodeTable(Enoding.Code_WPC1252)
    aftet this command calls SendBufferToPrinter
  - Spacing
    after setSpacing command calls SendBufferToPrinter

log release

1.04
- Added CutPartialPaper, CutTotalPaper and feed(lines As Int) in esc_pos.
- Added WriteBitmap WriteByte WriteText - send to print immediately
1.05
- Added conversions of color images to black and white for printing
1.06
- fixed LAN classbug
1.07
- Added Beep method
1.08
- Added WriteBarCode, WriteBarCode2D and for Printer_BT also added AddBarCode2d. Other commands to print 2D barcodes compatible with some POS ESCs
1.09
- Disconnect method now flushes before closing

George_G · Feb 24, 2024

Star-Dust said:
As has already been answered in the other section of the forum, you have to set the Code Page for Greek (one of these 7,65,66,67,68) but mainly the printer must support the code page.

You have to do the tests

In my case, the best solution is to create a bitmap, and print it.

lkching7 · Feb 26, 2024

Can connect to the virtual Bluetooth printer ?
The virtual Bluetooth printer is without MAC Address. The only way is connect by UUID

f0raster0 · Jun 4, 2024

Star-Dust said:
Example

View attachment 132996

just tested, for your records @Star-Dust , in case you want to know

it work great with:
1. EPSON TM-m30II (tested in those cases: BLE, Ethernet)
2. Xprinter XP-80 (Bluetooth)

Star-Dust · Jun 4, 2024

Thank

Olli73 · Jun 16, 2024

I try to use this it with "EPSON TM-m30III", connected by lan
The sample work for me.... sometimes.....
If I disconnect the connection (connected by lan) by checking the radiobutton "Disconnect All", and if I want to connect again, I get Lan_Connected = false everytime. I have to restart the activity.
Is it because of the limitations in Demo Libraries?

And how can I change the Charset? I need a Charset for printing "ö, ä, ü ....". But L_Printer.SetCodePage(6) dont work for me... the printed letter changed, but it is not an "Ö"....

Star-Dust · Jun 16, 2024

If you use disconnect to reopen the channels you must reinitialize the class.

For CharSet use CodeTable and SetCodePage

Olli73 · Jun 17, 2024

Hello! I have problems with the timing of sending to my Epson printer - connected by lan. If I stop manually by a breakpoint, it is printing. Without breakpoint, it is not printing.... I think, I dont understand the timing of the printer? I need to make a pause? Without, sometimes the printer print only parts of the lines.... Is "sleeping" the right way to do it?

B4X:

If LanConnected Then
       
        Dim n As Nachricht = myNachricht
       
        L_Printer.CenterJustify
        L_Printer.Writeline(ESC_POS.DoubleOn & "TICKET" & ESC_POS.DoubleOff)
        L_Printer.WriteLine(ESC_POS.feed(2))
        L_Printer.LeftJustify
        Sleep(500)
        Dim byteList As List = TextToWPC1252(n.Textnachricht) 'Encode a string to WPC1252 Byte Array'
       
        For Each bstr() As Byte In byteList '!!! If make a breakpoint in Debug - it is printing - without breakpoint it is not printing'
            L_Printer.Write_ArrayByte(bstr)
            L_Printer.Write(CRLF)
            Sleep(100)
        Next
       
        L_Printer.WriteLine(ESC_POS.feed(2))
        byteList = TextToWPC1252(n.Absender)
        For Each bstr() As Byte In byteList
            L_Printer.Write_ArrayByte(bstr)
            L_Printer.Write(CRLF)
        Next
        L_Printer.WriteLine(n.Datum)
        L_Printer.WriteLine(ESC_POS.feed(2))
        L_Printer.WriteLine(ESC_POS.feed(2))
        L_Printer.WriteLine(ESC_POS.CutPartialPaper)
       
        Sleep(200)
           
    End If

Star-Dust · Jun 17, 2024

I can't quite understand what you're describing.
But you seem to say that if you go into debug and stop it prints but in release mode the printer seems to be waiting for data.

This can happen if the streaming system waits for more data before sending, perhaps thinking it can fill the cache. Usually you should force the flush.
But to make a maneuver like this you have to be sure that this is the problem.

for further explanations see this link

aSyncStream and flush

Many output streams buffer writes to improve performance. Rather than sending each byte to its destination as it’s written, the bytes are accumulated in a memory buffer ranging in size from several bytes to several thousand bytes. When the buffer fills up, all the data is sent at once. The...

www.b4x.com

Star-Dust · Nov 11, 2024

NEW
Starting from SDK33 runtime permissions are required for accessing Bluetooth, see this link

error BlePeripheral e Android 13

HI, I am again asking for info on the BlePeripheral library as despite giving all the permissions I get this error Sub GetPermission_Bluetooth As ResumableSub Dim phone As Phone If phone.SdkVersion >= 31 Then For Each Permission As String In...

www.b4x.com

Pablo Torres · Apr 3, 2025

Star-Dust said:
I imagine you lose the connection after sending and then hang around exceeding the timeout.

If so, every time you send something to the printer, if the next send takes longer than 10 seconds (in some cases even less) you should open the connection [eg. Printer.Connect(Host,Port) ] again and perhaps close it after printing [eg. Printer.Disconnect]

Hi,

Something like this is happening to me everytime.
I have 2 printers in my b4A project, one USB connected and one LAN, the USB works ok but the LAN only prints once.
I send a notification for LAN printer, notification works OK but The printer seems like disconnect.
I also tried Printer.Connect(Host,Port) before printing and Printer.Disconnect after printing... but only prints first time
Can anyone help me?
The relevant code is the next: (L_Printer is the lan printer and I setup a timer for printing)

B4X:

Sub tmrComanda_Tick
    TimerComanda.Enabled=False
    Log("INTENTANDO CONECTAR")
    If L_Printer.IsInitialized Then
        L_Printer.Connect(strIP,9100)
        Wait For LAN_Connected(Success As Boolean)
        If Success Then
            Try
                L_Printer.CenterJustify
                L_Printer.WriteLine(ESC_POS.BoldOn & ESC_POS.DoubleOn & strEncabezado)
                L_Printer.Writeline(ESC_POS.BoldOn & ESC_POS.DoubleOn & strOrdenComanda)
                L_Printer.LeftJustify
                L_Printer.Write(ESC_POS.BoldOff & ESC_POS.DoubleOff & strImpresion)
                L_Printer.WriteLine(ESC_POS.CutPaper)
                L_Printer.WriteLine(ESC_POS.DoubleOn & " ")
                L_Printer.Beep(4,2)
                Sleep(1000)
                L_Printer.Disconnect
            Catch
                Log("ERROR AL IMPRIMIR COMANDA")
                Log(LastException)
            End Try
        Else
            Log("NO CONECTÓ IMPRESORA")
            Sleep(2000)
            TimerComanda.Enabled=True
        End If
    Else
        Log("INICIANDO IMPRESORA")
        L_Printer.Initialize(Me,"LAN")
        TimerComanda.Enabled=True
    End If
End Sub

Here are the logs:
[log]
INTENTANDO CONECTAR
INTENTANDO CONECTAR
NO CONECTÓ IMPRESORA
INTENTANDO CONECTAR
NO CONECTÓ IMPRESORA
INTENTANDO CONECTAR
NO CONECTÓ IMPRESORA[/log]

It looks like after disconnect it is not able to connect again... what should I do?
I tried many many things, but havent reach to a solution

Any help will be highly appreciated

Many Thanks

Star-Dust · Apr 3, 2025

Pablo Torres said:
Hi,

Something like this is happening to me everytime.
I have 2 printers in my b4A project, one USB connected and one LAN, the USB works ok but the LAN only prints once.
I send a notification for LAN printer, notification works OK but The printer seems like disconnect.
I also tried Printer.Connect(Host,Port) before printing and Printer.Disconnect after printing... but only prints first time
Can anyone help me?
The relevant code is the next: (L_Printer is the lan printer and I setup a timer for printing)

B4X:

Sub tmrComanda_Tick TimerComanda.Enabled=False Log("INTENTANDO CONECTAR") If L_Printer.IsInitialized Then L_Printer.Connect(strIP,9100) Wait For LAN_Connected(Success As Boolean) If Success Then Try L_Printer.CenterJustify L_Printer.WriteLine(ESC_POS.BoldOn & ESC_POS.DoubleOn & strEncabezado) L_Printer.Writeline(ESC_POS.BoldOn & ESC_POS.DoubleOn & strOrdenComanda) L_Printer.LeftJustify L_Printer.Write(ESC_POS.BoldOff & ESC_POS.DoubleOff & strImpresion) L_Printer.WriteLine(ESC_POS.CutPaper) L_Printer.WriteLine(ESC_POS.DoubleOn & " ") L_Printer.Beep(4,2) Sleep(1000) L_Printer.Disconnect Catch Log("ERROR AL IMPRIMIR COMANDA") Log(LastException) End Try Else Log("NO CONECTÓ IMPRESORA") Sleep(2000) TimerComanda.Enabled=True End If Else Log("INICIANDO IMPRESORA") L_Printer.Initialize(Me,"LAN") TimerComanda.Enabled=True End If End Sub

Here are the logs:
[log]
INTENTANDO CONECTAR
INTENTANDO CONECTAR
NO CONECTÓ IMPRESORA
INTENTANDO CONECTAR
NO CONECTÓ IMPRESORA
INTENTANDO CONECTAR
NO CONECTÓ IMPRESORA[/log]

It looks like after disconnect it is not able to connect again... what should I do?
I tried many many things, but havent reach to a solution

Any help will be highly appreciated

Many Thanks

some printers (few) seem to freeze.
You can try either to keep a connection always active for the next prints, or after printing send the reset command. see if you can solve it with these methods

Pablo Torres · Apr 3, 2025

Star-Dust said:
some printers (few) seem to freeze.
You can try either to keep a connection always active for the next prints, or after printing send the reset command. see if you can solve it with these methods

Thank you my friend for your help.
How do I keep the connection active?
Reset command? I also dont know how to do that

Any tip on those 2 advices will be very good for me

Many thanks again

Star-Dust · Apr 3, 2025

Reset

B4X:

Printer.InitializePrinter

Pablo Torres · Apr 3, 2025

Star-Dust said:
Reset

B4X:

Printer.InitializePrinter

That does not work, I did tried a lot
Any tip on keeping the connection alive?

Star-Dust · Apr 3, 2025

to keep it active you should initialize the class when the app opens and disconnect when it closes. this works if the printer drops the connection in the meantime.

Star-Dust · Apr 3, 2025

unfortunately I think it is something related to the printer. or the printer remains pending waiting for some information because you sent a wrong command

Star-Dust · Apr 20, 2025

1.09

Disconnect method now flushes before closing

Pablo Torres · Apr 20, 2025

Star-Dust said:
1.09

Disconnect method now flushes before closing

Great, can yo send me the update?

Lakhtin_V · Aug 29, 2025

In my case I am testing Xprinter XP-420B, with this example and the last library I have come very close to success. According to the logs, the text and picture embedded inside the example go to the printer without errors, but nothing is printed. The printer is silent and does not twitch. But a message appears: this is a Demo library, I'm sorry

Star-Dust · Aug 29, 2025

Hi, the demo version has some limitations. It prints every two minutes. (See post #1) When you see that message, it means that the feature is limited.

B4A Library SD EscPos Printer (Lan,USB, Bluetooth SPP, BLE)

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