Android USG HPGL controller cutting plotter - 02/08/2018 11:55 EDT

Android USG HOST controller for Silhouette Cameo 3 cutting plotter using HPGL language. The controller should be a java class source that I can incorporate into my app. It should take the string containing the HPGL commands in the constructor or otherwise: String test = "IN;IP;SP1;PU0,0;PD100,0,100,100,0,100,0,0;PU50,50;"; (I have the files HPGL files containing the commands) And it should send the string in ASCII chars to the plotter using the 'Android Developers' specificacions, somewhat like this: private void print(final UsbDeviceConnection connection, final UsbInterface usbInterface) { final String test = "IN;IP;SP1;PU0,0;PD100,0,100,100,0,100,0,0;PU50,50;"; testBytes = [login to view URL](); if (usbInterface == null) { [login to view URL](this, "INTERFACE IS NULL", Toast.LENGTH_SHORT).show(); } else if (connection == null) { [login to view URL](this, "CONNECTION IS NULL", Toast.LENGTH_SHORT).show(); } else if (forceCLaim == null) { [login to view URL](this, "FORCE CLAIM IS NULL", Toast.LENGTH_SHORT).show(); } else { [login to view URL](usbInterface, forceCLaim); Thread thread = new Thread(new Runnable() { @Override public void run() { [login to view URL](mEndPoint, testBytes, [login to view URL], 0); } }); [login to view URL](); } } Obviously there must be something wrong with my implementarion of this, and that is why I asking for help