POS printing from mobile

Hi developers,
I am looking to implement POS printing through android mobile, which also works in offline mode.
Has anyone successfully done the same?

Also I tried using the print button on POS page on ERPNext App but it fails and get redirected to file:///android_asset/www/undefined on execution of the following line

 window.open()

in the function

print_document: function (html) { 
    var w = window.open();
    w.document.write(html);
    w.document.close();
    setTimeout(function () {   
      w.print();
      w.close();
    }, 1000)
},

Is this a known issue? Are there any workarounds?

Currently printing is not supported on mobile. Will have to handle this separately in Cordova.

Any update on this issue?

Any update on this?

Have you tried this?

Did POS print via Bluetooth printer?