After adding a Thread.sleep(15000), we managed to successfully print all the images.
It looks like we are printing the images to fast for the RW420 to keep up.
Does the Android API somehow provide a method to check if the printer is done printing the label ?
Hi Wouter, You did figure out the primary answer to the issue of sending the print jobs to wait. Unfortunately there is no good way to know when the print jobs are complete on that model. Newer printers have more methods to check statuses that indicate printing usage as well as much faster BT radio's. Sorry.