Garbage characters in print receipt and scanning issue

Question

Hi Team I am having an telpo thermal printer and I've developed an app in flutter to print the receipt and the receipt print is working fine but there are some garbage characters printed in my print receipt, like dots and a0, a1, etc. 

https://drive.google.com/file/d/13E4TCTwIw5d94G8p-qmFj3WPDfVMh03c/view?usp=share_link

Also, while scanning the QR code, I am getting the message App won't run without Google Play services, which are not supported by your device.

https://drive.google.com/file/d/19UZeogZr-npfptajc7mESk75J59YnOBl/view?usp=share_link

Answer 1

1.but there are some garbage characters printed in my print receipt, like dots and a0, a1, etc. 

--------What ESC commands do you use to print this reciept?

2.Also, while scanning the QR code, I am getting the message App won't run without Google Play services, which are not supported by your device.

-------M1 has google play services.Please give us the SN and build number in the settings.

Wether your app needs the GMS certification?

Comments

1. I am using flutter to print the receipt and I am using writeRawData() methos of the plugin  https://pub.dev/packages/flutter_simple_bluetooth_printer

2. Serial number A33M001000700009    
There are 2 x IMEI:  866557060479781  and   866557060479799

Can you also please let me know the character table for printer and write the corresponding commands

Regarding character code you can let me know from here which one I'll need to use
https://reference.epson-biz.com/modules/ref_charcode_en/index.php?content_id=10

Also the print is working fine on other brand thermal printer but not working on Telpo M1.

Below is the flutter code snippet I am using to print the receipt

try {
      await _connectDevice();
      if (!_isConnected) return;
      final isSuccess = await bluetoothManager.writeRawData(codes);
      if (isSuccess) {
        await bluetoothManager.disconnect();
      }
    } on BTException catch (e) {
      print(e);
    }

Any help is appreciated.

Thank you

---

1. I am using flutter to print the receipt and I am using writeRawData() methos of the plugin  https://pub.dev/packages/flutter_simple_bluetooth_printer
----Can you send us your project (source code) for us checking.
This link is only the plugin.
2.Can you also please let me know the character table for printer and write the corresponding commands
-------Please check this document.
http://service.telpo.net:8091/index/user/fetfile?key=QoGSlMwrhC9XUT5E

---

Hi Team,

We have created the sample code for you, so that you guys can check why printer is printing garbage value.

https://drive.google.com/file/d/1fGoCVbfu7CZzO1lfzpPqArloY4cnakpV/view?usp=share_link