Print Receipt from Windows Forms C# application to KR203

Hello.

We have a Windows Forms C# Application and we are trying to print a receipt for our customers with the Zebra KR203. How can we achive this? Is there any SDK available?

 

We've tried to send a print command in c# but the job keeps waiting forever in the printing queue.

 

We also tested with Zebra Toolbox and achived to print <SelfTestSlip> etc...

 

Any suggestions?

 

Thanks.