Image print not completed on T1 device,

[kechankrisna]

I tested Wireless printer on T1 device, The image doesn't print completely. It works good on one of my android device.

[kechankrisna]

When I test on my samsung device, small height image getting print correctly, but when the image height is getting bigger, it prints only some above part of image.

[kechankrisna]

Here is a code i wrote to split byes into chunk, it works with big data:

Future<PosPrintResult> printLongTicket(Ticket ticket, { int chunkSizeBytes = 50000, int queueSleepTimeMs = 1000 }) async {
    if (_host == null || _port == null) {
      return Future<PosPrintResult>.value(PosPrintResult.printerNotSelected);
    } else if (ticket == null || ticket.bytes.isEmpty) {
      return Future<PosPrintResult>.value(PosPrintResult.ticketEmpty);
    }

    final List<List<int>> chunks = [];

    final len = ticket.bytes.length;

    //check if total length is lower than chunkSize
    if(ticket.bytes.length <= chunkSizeBytes){
      chunks.add( ticket.bytes );
    }else{
      for (var i = 0; i < len; i += chunkSizeBytes) {
        final end = (i + chunkSizeBytes < len) ? i + chunkSizeBytes : len;
        chunks.add(ticket.bytes.sublist(i, end));
      }
    }
    
    try {
      final Duration _timeout = Duration(milliseconds: (chunks.length * queueSleepTimeMs) + 5000); //5000 is more delay to avoid error
      final Socket socket = await Socket.connect(_host,_port,timeout: _timeout,);

      for (List<int> data in chunks) {
        socket.add(data);
        sleep(Duration(milliseconds: queueSleepTimeMs));
      }
      socket.destroy();
      print('size ${ticket.bytes.length}');
      return Future<PosPrintResult>.value(PosPrintResult.success);
    } catch (e) {
      print('Error: $e');
      return Future<PosPrintResult>.value(PosPrintResult.timeout);
    }
  }

[DmitrySikorsky]

Thanks, @kechankrisna. I was thinking about adding delays too. I think this could be simpler:

      int start = 0;
      List<int> bytes;

      do {
        int end = start + 8192;

        if (end > receipt.bytes.length) {
          end = receipt.bytes.length;
        }

        bytes = receipt.bytes.sublist(start, end);
        start += 8192;

        await _bluetoothManager.writeData(bytes);

        if (receipt.bytes.length > 8192) {
          await _wait(5);
        }
      }

      while (start < receipt.bytes.length);